CA2580658C - System and method of transmitting data from an aircraft - Google Patents
System and method of transmitting data from an aircraft Download PDFInfo
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- CA2580658C CA2580658C CA2580658A CA2580658A CA2580658C CA 2580658 C CA2580658 C CA 2580658C CA 2580658 A CA2580658 A CA 2580658A CA 2580658 A CA2580658 A CA 2580658A CA 2580658 C CA2580658 C CA 2580658C
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- Prior art keywords
- aircraft
- data
- card
- communications signal
- memory
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/3822—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving specially adapted for use in vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18502—Airborne stations
- H04B7/18506—Communications with or from aircraft, i.e. aeronautical mobile service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/18—Network protocols supporting networked applications, e.g. including control of end-device applications over a network
Abstract
A system and method of transmitting data from an aircraft includes a PC card that acquires aircraft data and transmits the aircraft data over a radio frequency communications signal into the skin of the aircraft, which radiates the radio frequency communications signal to a location remote from the aircraft.
Description
SYSTEM AND METHOD OF TRANSMITTING DATA
FROM AN AIRCRAFT
Field of the Invention The present invention relates to communication systems, and more particularly, the present invention relates to a system and method of transmitting data from an aircraft.
Background of the Invention A Digital Acquisition Unit (DAU), also known by some skilled in the art as a DFDAU, receives signals from many on-board aircraft systems. The DAU processes the data as Flight Operations Quality Assurance (FOQA) data, which is recovered from the aircraft by different prior ' art techniques. For example, a PCMCIA card may connect into an auxiliary PCMCIA slot of the Data Acquisition Unit and record data into a flash memory of the card.
Once the data is collected into flash memory, airline operators manually replace the PCMCIA cards with a new card and retrieve the aircraft data from the flash memory of the old card.
Other prior art techniques for collecting this aircraft data include wiruless systems, which often require costly aircraft modifications. For example, a separate unit to record data, such as a ground data link unit, is required, and an additional aircraft antenna must be mounted on the fuselage. Often aircraft wiring changes are made. These ground data link units require a data processor, a data collection circuit, a wireless LAN
radio, a power amplifier, and external fuselage antenna.
Multiple line receiver units are also often required adding to the significant investment made by an aircraft operator.
Examples of ground data link systems that have been used in an aircraft are disclosed in commonly assigned U.S. Pat. Nos. 6,047,165; 6,104,914; 6,108,523;
6,148,179; 6,154,636; 6,154,637; 6,160,998; 6,163,681;
6,167,238; 6,167,239; 6,173,159; 6,308,044; 6,308,045;
6,353,734; 6,522,867; and 6,745,010.
It would be desirable, however, to extract Flight Operations Quality Assurance data or other aircraft data from an aircraft component, such as a DAU, in a less complicated and costly system, rather than using a ground data link unit or manually replacing flash memory PCMCIA cards.
Summary of the Invention The present invention advantageously provides a turn-key solution in a removable PC card, which includes a storage memory, control logic circuitry, a processor, and a radio transceiver for transmitting aircraft data along a radio frequency signal. In one aspect of the present invention, the skin of the aircraft receives the radio frequency signal and radiates the radio frequency signal to a location remote from the aircraft, for example, access points of a local area network. The transmitter is preferably operative in accordance with 802.11 standards in which aircraft data is transmitted over a spread spectrum communications signal, such as a frequency hopping spread spectrum communications signal
FROM AN AIRCRAFT
Field of the Invention The present invention relates to communication systems, and more particularly, the present invention relates to a system and method of transmitting data from an aircraft.
Background of the Invention A Digital Acquisition Unit (DAU), also known by some skilled in the art as a DFDAU, receives signals from many on-board aircraft systems. The DAU processes the data as Flight Operations Quality Assurance (FOQA) data, which is recovered from the aircraft by different prior ' art techniques. For example, a PCMCIA card may connect into an auxiliary PCMCIA slot of the Data Acquisition Unit and record data into a flash memory of the card.
Once the data is collected into flash memory, airline operators manually replace the PCMCIA cards with a new card and retrieve the aircraft data from the flash memory of the old card.
Other prior art techniques for collecting this aircraft data include wiruless systems, which often require costly aircraft modifications. For example, a separate unit to record data, such as a ground data link unit, is required, and an additional aircraft antenna must be mounted on the fuselage. Often aircraft wiring changes are made. These ground data link units require a data processor, a data collection circuit, a wireless LAN
radio, a power amplifier, and external fuselage antenna.
Multiple line receiver units are also often required adding to the significant investment made by an aircraft operator.
Examples of ground data link systems that have been used in an aircraft are disclosed in commonly assigned U.S. Pat. Nos. 6,047,165; 6,104,914; 6,108,523;
6,148,179; 6,154,636; 6,154,637; 6,160,998; 6,163,681;
6,167,238; 6,167,239; 6,173,159; 6,308,044; 6,308,045;
6,353,734; 6,522,867; and 6,745,010.
It would be desirable, however, to extract Flight Operations Quality Assurance data or other aircraft data from an aircraft component, such as a DAU, in a less complicated and costly system, rather than using a ground data link unit or manually replacing flash memory PCMCIA cards.
Summary of the Invention The present invention advantageously provides a turn-key solution in a removable PC card, which includes a storage memory, control logic circuitry, a processor, and a radio transceiver for transmitting aircraft data along a radio frequency signal. In one aspect of the present invention, the skin of the aircraft receives the radio frequency signal and radiates the radio frequency signal to a location remote from the aircraft, for example, access points of a local area network. The transmitter is preferably operative in accordance with 802.11 standards in which aircraft data is transmitted over a spread spectrum communications signal, such as a frequency hopping spread spectrum communications signal
- 2 -or a direct sequence spread spectrum communications signal.
The data can be transmitted to a Central Maintenance Display Unit /CMDU), indicating in real-time the health and status of aircraft systems. The data can be flight performance data, such as Flight Operations Quality Assurance (FOQA) data from the DAU, aircraft engine data, in-flight entertainment data, or aircraft data relating to aircraft contents, passenger data, aircraft departure and arrival, passenger transactions, or a sky marshall. The PC card preferably is formed as a PCMCIA card with a desired form factor, for example, a Type III PCMCIA card.
In one aspect of the present invention, the PC
card includes a PC card interface adapted for connecting to an aircraft component, such as the DAU. A memory stores aircraft data received from the aircraft component. A radio transmitter receives the aircraft data from the memory and transmits the aircraft data over a radio frequency signal. A processor is operatively connected to the PC card interface, memory and radio transmitter for reading and forwarding data from the memory to the radio transmitter. A logic circuit is operative with the memory, processor and PC card interface for controlling the downloading of data from the aircraft component to the memory and the reading andt the forwarding of data from the memory to the radio transmitter without conflict between the processor and aircraft component.
In one aspect of the present invention, the logic circuit comprises a field programmable gate array.
The data can be transmitted to a Central Maintenance Display Unit /CMDU), indicating in real-time the health and status of aircraft systems. The data can be flight performance data, such as Flight Operations Quality Assurance (FOQA) data from the DAU, aircraft engine data, in-flight entertainment data, or aircraft data relating to aircraft contents, passenger data, aircraft departure and arrival, passenger transactions, or a sky marshall. The PC card preferably is formed as a PCMCIA card with a desired form factor, for example, a Type III PCMCIA card.
In one aspect of the present invention, the PC
card includes a PC card interface adapted for connecting to an aircraft component, such as the DAU. A memory stores aircraft data received from the aircraft component. A radio transmitter receives the aircraft data from the memory and transmits the aircraft data over a radio frequency signal. A processor is operatively connected to the PC card interface, memory and radio transmitter for reading and forwarding data from the memory to the radio transmitter. A logic circuit is operative with the memory, processor and PC card interface for controlling the downloading of data from the aircraft component to the memory and the reading andt the forwarding of data from the memory to the radio transmitter without conflict between the processor and aircraft component.
In one aspect of the present invention, the logic circuit comprises a field programmable gate array.
-3-The PC card body preferably has a PCMCIA form factor.
The transmitter preferably comprises a spread spectrum transmitter for transmitting aircraft data over a spread spectrum communications signal, which could be a frequency hopping or direct sequence spread spectrum communications signal. The PC card can also include a receiver as part of a transceiver that receives data for on-board processing. This type of received data could comprise at least data for specifying one of the power limits, frequency or type of aircraft data to be transmitted.
Brief Description of the Drawings Other objects, features anc4 advantages of the present invention will become apparent from the detailed description of the invention which follows, when considered in light of the accompanying drawings in which:
FIG. 1 is a block diagram showing an aircraft Data Acquisition Unit and 'a prior art PCMCIA Type II
memory card interfaced with the Data Acquisition Unit, and showing the different inputs from the Data Acquisition Unit into the PCMCIA memory card.
FIG. 2 is a block diagram of the PC card of the present invention, which interfaces with an aircraft component, such as a Digital Acquisition Unit, and showing a processor, logic circuit, memory and transceiver.
FIGS. 3A, 35 and 3C are respective front elevation, top plan and side elevation views of the PC
The transmitter preferably comprises a spread spectrum transmitter for transmitting aircraft data over a spread spectrum communications signal, which could be a frequency hopping or direct sequence spread spectrum communications signal. The PC card can also include a receiver as part of a transceiver that receives data for on-board processing. This type of received data could comprise at least data for specifying one of the power limits, frequency or type of aircraft data to be transmitted.
Brief Description of the Drawings Other objects, features anc4 advantages of the present invention will become apparent from the detailed description of the invention which follows, when considered in light of the accompanying drawings in which:
FIG. 1 is a block diagram showing an aircraft Data Acquisition Unit and 'a prior art PCMCIA Type II
memory card interfaced with the Data Acquisition Unit, and showing the different inputs from the Data Acquisition Unit into the PCMCIA memory card.
FIG. 2 is a block diagram of the PC card of the present invention, which interfaces with an aircraft component, such as a Digital Acquisition Unit, and showing a processor, logic circuit, memory and transceiver.
FIGS. 3A, 35 and 3C are respective front elevation, top plan and side elevation views of the PC
-4-card of the present invention in a desired Type III
PCMCIA form factor.
FIG. 4 is a fragmentary, partial block diagram of an aircraft having the PC card of the present invention connected into an aircraft component, and wirelessly transmitting aircraft data along a radio frequency communications signals into the skin of the aircraft, which radiates the radio frequency communications signals to a wireless local area network (LAN) access point (AP) to be processed at a server and processor.
FIG. 5 is a block diagram showing various aircraft components that can be interfaced with the PC
card of the present invention.
FIG. 6 is a graph showing a polar plot superimposed on a regional jet for a 20 meter radiated field test using the system of the present invention.
FIG. 7 is a graph showing a rectangular grid superimposed on the regional jet used for the close-in far field measurements using the system of the present invention.
FIG. 8 is a graph showing a plot of the 20 meter radio frequency field readings using the system of the present invention.
FIG. 9 is a graph showing the rationalized plot of FIG. 8 data.
FIG. 10 is a three dimensional perspective view of the near-skin data collected by using the system of the present invention.
FIG. 11 is a plan view of the data shown in FIG. 10.
PCMCIA form factor.
FIG. 4 is a fragmentary, partial block diagram of an aircraft having the PC card of the present invention connected into an aircraft component, and wirelessly transmitting aircraft data along a radio frequency communications signals into the skin of the aircraft, which radiates the radio frequency communications signals to a wireless local area network (LAN) access point (AP) to be processed at a server and processor.
FIG. 5 is a block diagram showing various aircraft components that can be interfaced with the PC
card of the present invention.
FIG. 6 is a graph showing a polar plot superimposed on a regional jet for a 20 meter radiated field test using the system of the present invention.
FIG. 7 is a graph showing a rectangular grid superimposed on the regional jet used for the close-in far field measurements using the system of the present invention.
FIG. 8 is a graph showing a plot of the 20 meter radio frequency field readings using the system of the present invention.
FIG. 9 is a graph showing the rationalized plot of FIG. 8 data.
FIG. 10 is a three dimensional perspective view of the near-skin data collected by using the system of the present invention.
FIG. 11 is a plan view of the data shown in FIG. 10.
-5-FIG. 12 is a graph showing a two-curved plot of the 20 meter and 2 meter data for comparison purposes.
FIG. 13 is a graph showing the representation of 1/r and 1/r2 power roll off as a function of distance.
Detailed Description of the Preferred Embodiments The present invention will now be described more fully hereinafter with referencE to the accompanying drawings, in which preferred embodiments of the invention are shown. This invention may, however, be embodied in many different forms and bhould not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like numbers refer to like elements throughout, and prime notation is used to indicate similar elements in alternative embodiments.
The present invention automatically and without manual intervention allows Flight Operations Quality Assurance (FOQA) or other aircraft dEta to be extracted from an aircraft component, such as the Digital Acquisition Unit (DAU), into a PC card, without requiring airline operators to manually replace the PC cards to obtain the FOQA data, as in many prior art systems. The present invention is also advantageous over prior art wireless systems, which normally require costly aircraft modification, including the use of a separate unit to record aircraft data, an external aircraft antenna mounted on the fuselage, and aircraft wiring changes.
FIG. 13 is a graph showing the representation of 1/r and 1/r2 power roll off as a function of distance.
Detailed Description of the Preferred Embodiments The present invention will now be described more fully hereinafter with referencE to the accompanying drawings, in which preferred embodiments of the invention are shown. This invention may, however, be embodied in many different forms and bhould not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like numbers refer to like elements throughout, and prime notation is used to indicate similar elements in alternative embodiments.
The present invention automatically and without manual intervention allows Flight Operations Quality Assurance (FOQA) or other aircraft dEta to be extracted from an aircraft component, such as the Digital Acquisition Unit (DAU), into a PC card, without requiring airline operators to manually replace the PC cards to obtain the FOQA data, as in many prior art systems. The present invention is also advantageous over prior art wireless systems, which normally require costly aircraft modification, including the use of a separate unit to record aircraft data, an external aircraft antenna mounted on the fuselage, and aircraft wiring changes.
-6-The present invention uses a single PC card, for example, a PC card operable in accordance with the Personal Computer Memory Card International Association (PCMCIA). The present invention uses the passive radiation coupling of a radio frequency communications signal into the skin of the fuselage, which radiates, i.e., re-radiates the radio frequency communications signal received from the PC card, which had radiated the signal from its antenna, and eliminates the necessity for adding an additional, external aircraft antenna mounted on the fuselage.
Prior art systems include the use of a flash memory PCMCIA card, or an integrated system such as the ground data link systems disclosed in the above-identified, commonly assigned patents. The ground data link system disclosed in those patents sometimes require multiple Local Receiver Units (LRU's) and a data collection unit having a central processing unit, a wireless local area network (LAN) radio, a power amplifier, and an external fuselage antenna.
The ground data link unit as disclosed in the above-identified patents operates with the ARINC 763 system, and is connected into the Data Acquisition Unit (DAU) (also known as the DFDAU), typically through the optional auxiliary output using an ARINC 429 link.
The Digital Access Unit system typically includes a separate central processing unit (CPU) for a mandatory portion or segment that connects by a ARINC 717 link to the Digital Flight Data Recorder (DFDR). The DAU
Prior art systems include the use of a flash memory PCMCIA card, or an integrated system such as the ground data link systems disclosed in the above-identified, commonly assigned patents. The ground data link system disclosed in those patents sometimes require multiple Local Receiver Units (LRU's) and a data collection unit having a central processing unit, a wireless local area network (LAN) radio, a power amplifier, and an external fuselage antenna.
The ground data link unit as disclosed in the above-identified patents operates with the ARINC 763 system, and is connected into the Data Acquisition Unit (DAU) (also known as the DFDAU), typically through the optional auxiliary output using an ARINC 429 link.
The Digital Access Unit system typically includes a separate central processing unit (CPU) for a mandatory portion or segment that connects by a ARINC 717 link to the Digital Flight Data Recorder (DFDR). The DAU
- 7 -
8 receives sensor information from the aircraft engines, flaps, electronics and numerous other aircraft systems, sometimes as many as 2,000 different systems in large commercial aircraft. An optional portion of the DAU
typically includes a separate CPU and an optional/auxiliary output, for example, formed as a PCMCIA slot. The prior art multiple-LARU approach using an external fuselage antenna and a ground data link unit, or similar devices, typically required expensive equipment acquisition and aircraft modifications. This often required that the aircraft be out-of-service to place the system in operation. Also, sometimes FAA
certification was required, which took time after or before installation.
Although some prior art systems include a standard PCMCIA Type II memory card interfaced to the DAU, the card still had to be manually removed for data retrieval. Other prior art systems used quick access recorders having optical/magnetic media, which had to be removed for data retrieval.
The present invention allows aircraft operators to extract aircraft data, such as Flight Operations Quality Assurance (FOQA) data, from the aircraft while minimizing their costs of such retrieval.
The present invention uses a removable PC card, such as a PCMCIA card, with a flash storage memory circuit, control logic circuitry, a processor, wide local area network (WLAN) radio drivers, and a complete 802.11 WLAN transceiver that transmits the aircraft data and receives data for on-board processing. The use of a PC
card reduces cost to the aircraft operator without requiring the aircraft to be out-of-service while a system is installed. No external antenna is required because the aircraft skin and fuselage acts as a passive radiator, in accordance with the present invention, to transmit or receive data from the aircraft. This can optimize transmission from the aircraft and reduce internal aircraft multipath attenuation.
FIG. 1 illustrates a conventional Digital Acquisition Unit (DAU) 20 and a PC card designed as a PCMCIA flash memory card 22 connected into the optional PCMCIA connector 24 of the DAU, which interfaces an auxiliary ARINC 429 link. This prior art PCMCIA memory card 22 was typically a Type II memory card, and included an ATA flash card controller 25 that connected into a flash memory 26, and a regulator circuit 28. The ATA
standard is an AT attachment for a preferred IDE drive interface on a PC card. The PCMCIA connector 24 on the DAU 20 is formed as a 68-pin connector that connects to the PCMCIA Type II memory card 22 as shown in FIG. 1.
The memory card typically has about 256 megabytes of storage and a thickness of about 5 mm. FIG. 1 also shows the various functions and data that can be extracted from the DAU and input into the ATA flashcard controller 25.
FIG. 1 also shows the different connections to the flash memory 26 from the ATA flashcard controller 25. The chart below shows the pinouts and pin identification.
typically includes a separate CPU and an optional/auxiliary output, for example, formed as a PCMCIA slot. The prior art multiple-LARU approach using an external fuselage antenna and a ground data link unit, or similar devices, typically required expensive equipment acquisition and aircraft modifications. This often required that the aircraft be out-of-service to place the system in operation. Also, sometimes FAA
certification was required, which took time after or before installation.
Although some prior art systems include a standard PCMCIA Type II memory card interfaced to the DAU, the card still had to be manually removed for data retrieval. Other prior art systems used quick access recorders having optical/magnetic media, which had to be removed for data retrieval.
The present invention allows aircraft operators to extract aircraft data, such as Flight Operations Quality Assurance (FOQA) data, from the aircraft while minimizing their costs of such retrieval.
The present invention uses a removable PC card, such as a PCMCIA card, with a flash storage memory circuit, control logic circuitry, a processor, wide local area network (WLAN) radio drivers, and a complete 802.11 WLAN transceiver that transmits the aircraft data and receives data for on-board processing. The use of a PC
card reduces cost to the aircraft operator without requiring the aircraft to be out-of-service while a system is installed. No external antenna is required because the aircraft skin and fuselage acts as a passive radiator, in accordance with the present invention, to transmit or receive data from the aircraft. This can optimize transmission from the aircraft and reduce internal aircraft multipath attenuation.
FIG. 1 illustrates a conventional Digital Acquisition Unit (DAU) 20 and a PC card designed as a PCMCIA flash memory card 22 connected into the optional PCMCIA connector 24 of the DAU, which interfaces an auxiliary ARINC 429 link. This prior art PCMCIA memory card 22 was typically a Type II memory card, and included an ATA flash card controller 25 that connected into a flash memory 26, and a regulator circuit 28. The ATA
standard is an AT attachment for a preferred IDE drive interface on a PC card. The PCMCIA connector 24 on the DAU 20 is formed as a 68-pin connector that connects to the PCMCIA Type II memory card 22 as shown in FIG. 1.
The memory card typically has about 256 megabytes of storage and a thickness of about 5 mm. FIG. 1 also shows the various functions and data that can be extracted from the DAU and input into the ATA flashcard controller 25.
FIG. 1 also shows the different connections to the flash memory 26 from the ATA flashcard controller 25. The chart below shows the pinouts and pin identification.
-9-Pinouts Pin Pin Pin Pin Pin Pin Pin Pin No. Name No. _ Name No. Name No. Name 03 D4 20 RFU 37 Dll 54 RFU
RFU 27 , A2 44 /IORD 61 /REG
11 A9 28 Al 45 /IOWR 62 DASP
5 Pin Identification Symbol Function DO - D15 Data Bus (bidirectional) =
AO - A10 Address Bus (input) /CE1, /CE2 Card Enable (input) /OE, /WE Output / Write Enable (input) /REG Register Select (input) /IORD, /IOWR I/O Access (input;
/CD1, /CD2 Card Detect (output) /IRQ, /1016, RST, /WAIT, DASP, CSEL, I/O Handshaking (input/output) PDIAG, INPACK
RFU Reserved for Future Use VCC +5V or +3.3V power input FIG. 2 is a block diagram of the PC card 30 of
RFU 27 , A2 44 /IORD 61 /REG
11 A9 28 Al 45 /IOWR 62 DASP
5 Pin Identification Symbol Function DO - D15 Data Bus (bidirectional) =
AO - A10 Address Bus (input) /CE1, /CE2 Card Enable (input) /OE, /WE Output / Write Enable (input) /REG Register Select (input) /IORD, /IOWR I/O Access (input;
/CD1, /CD2 Card Detect (output) /IRQ, /1016, RST, /WAIT, DASP, CSEL, I/O Handshaking (input/output) PDIAG, INPACK
RFU Reserved for Future Use VCC +5V or +3.3V power input FIG. 2 is a block diagram of the PC card 30 of
10 the present invention, which includes a wireless transceiver 32 for transmitting aircraft data, including Flight Operations Quality Assurance (FOQA) data, and receiving data for on-boald processing. The transceiverµ
32 includes respective transmitter and receiver sections 32a, 32b. FIGS. 3A, 33 and 3C show one form factor for the PC card 30 of the present invention. The PC card includes a body 30a formed as a PCMCIA Type III memory card, which is about 10.5 mm thick and sufficiently large enough to hold the additional circuitry, logic circuits, controller (or processor), and transceiver used in the PC
card of the present invention.
As illustrated in FIG. 2, the PC card 30 of the present invention includes a PC card-16 I/F interface circuit 34. A Field Programmable Gate Array (FPGA) 36 circuit acts as logic circuitry to interface a CF socket 38, the ATA 512 megabyte compact flash memory 40, and the interface circuit 34. The PC card 30 of the present invention includes a central processing unit or processor 42, which interfaces through a development header circuit 44 with the field programmable gate array 36 and through another development header circuit 46 to the wireless local area network radio transceiver 32 via a radio socket circuit 48.
A communication circuit 50 C01/CO2 interfaces between the PC card interface 34 and the data/communications bus on the development header interface 44 between the central processing unit 42 and the field programmable gate array 36. A supervisor circuit 52 is operable with the field programmable gate array 36 as a logic circuit and monitors the PC card operation and its interface with the DAU 20 for
32 includes respective transmitter and receiver sections 32a, 32b. FIGS. 3A, 33 and 3C show one form factor for the PC card 30 of the present invention. The PC card includes a body 30a formed as a PCMCIA Type III memory card, which is about 10.5 mm thick and sufficiently large enough to hold the additional circuitry, logic circuits, controller (or processor), and transceiver used in the PC
card of the present invention.
As illustrated in FIG. 2, the PC card 30 of the present invention includes a PC card-16 I/F interface circuit 34. A Field Programmable Gate Array (FPGA) 36 circuit acts as logic circuitry to interface a CF socket 38, the ATA 512 megabyte compact flash memory 40, and the interface circuit 34. The PC card 30 of the present invention includes a central processing unit or processor 42, which interfaces through a development header circuit 44 with the field programmable gate array 36 and through another development header circuit 46 to the wireless local area network radio transceiver 32 via a radio socket circuit 48.
A communication circuit 50 C01/CO2 interfaces between the PC card interface 34 and the data/communications bus on the development header interface 44 between the central processing unit 42 and the field programmable gate array 36. A supervisor circuit 52 is operable with the field programmable gate array 36 as a logic circuit and monitors the PC card operation and its interface with the DAU 20 for
-11-controlling the downloading of data from an aircraft component to the memory, and the reading and forwarding of the aircraft data from the memory to the radio transmitter section 32a of the radio transceiver 32 without conflict between the processor and the aircraft component. The supervisor circuit 52 and FPGA 36 permit the disconnection of the CPU 42 in the PC card, and allows the CPU in the DAU 20 to control data extraction from the DAU into the ATA-512 megabyte compact flash memory 40 of the PC card 30. The supervisor 52 and FPGA
36 allows the CPU 42 to read aircraft data from the compact flash memory 26 and forward the aircraft data to the transceiver 32, where the transmitter section 32a of the transceiver wirelessly transmits the aircraft data as a radio frequency communications signal into the skin of the aircraft, which reradiates the radio frequency communications signal to a location lemote from the aircraft.
The PC card 30 can include two antenna connections, RP-SMA 54, allowing connection of the transceiver to small linear or other antennas about one or two inches long. Preferably, a conformal antenna would be used, conforming in design to the illustrated Type III PCMCIA card, as one non-limiting example. It should be understood that other form factors can be used in the present invention besides the PCMCIA Type III form factor. The transceiver 32 also includes a receiver circuit 32b, which is operative to receive data for specifying one of the power limits, frequency or type of aircraft data.
36 allows the CPU 42 to read aircraft data from the compact flash memory 26 and forward the aircraft data to the transceiver 32, where the transmitter section 32a of the transceiver wirelessly transmits the aircraft data as a radio frequency communications signal into the skin of the aircraft, which reradiates the radio frequency communications signal to a location lemote from the aircraft.
The PC card 30 can include two antenna connections, RP-SMA 54, allowing connection of the transceiver to small linear or other antennas about one or two inches long. Preferably, a conformal antenna would be used, conforming in design to the illustrated Type III PCMCIA card, as one non-limiting example. It should be understood that other form factors can be used in the present invention besides the PCMCIA Type III form factor. The transceiver 32 also includes a receiver circuit 32b, which is operative to receive data for specifying one of the power limits, frequency or type of aircraft data.
-12-In a preferred aspect of the present invention, the WLAN wireless transceiver 32 is operable to transmit aircraft data over a spread spectrum communications signal, such as a frequency hopping or direct sequence spread spectrum communications signal. Preferably the transceiver 32 transfers the aircraft data over a radio frequency signal that is in accordance with 802.11 family of specifications for wireless LAN technology and, in one aspect of the present invention, in accordance with 802.11(b), high rate or tbe Wi-Fi standard, which applies to wireless LAN's and provides 11 Mbps transmission with a fallback to 5.5, 2 and 1 Mbps in the 2.4 GHz band.
Preferably only a direct sequence spread spectrum communications signal is used, but frequency hopping spread spectrum communications systems can be used in other embodiments, as well as other spread spectrum systems, including modified chirp and similar systems. The present invention also allows wireless functionality, comparable to Ethernet. It should be understood, however, that besides 802.11(b) protocol, other 802.11 or other communication protocols, including different types of complementary code keying (CCK) used with direct sequence spread spectrum technology can be used. The system could include Wired Equivalent Privacy (WEP) by encrypting data and Wi-Fi Protected Access (WPA), which improves security features of the Wired Equivalent Privacy. The system can include improved data encryption through a Temporal Key Integrity Protocol (TKIP), which scrambles the keys using a hashing algorithm and uses an integrity-checking feature. The system can have user authentication through an Extensible
Preferably only a direct sequence spread spectrum communications signal is used, but frequency hopping spread spectrum communications systems can be used in other embodiments, as well as other spread spectrum systems, including modified chirp and similar systems. The present invention also allows wireless functionality, comparable to Ethernet. It should be understood, however, that besides 802.11(b) protocol, other 802.11 or other communication protocols, including different types of complementary code keying (CCK) used with direct sequence spread spectrum technology can be used. The system could include Wired Equivalent Privacy (WEP) by encrypting data and Wi-Fi Protected Access (WPA), which improves security features of the Wired Equivalent Privacy. The system can include improved data encryption through a Temporal Key Integrity Protocol (TKIP), which scrambles the keys using a hashing algorithm and uses an integrity-checking feature. The system can have user authentication through an Extensible
-13-. .
Authentication Protocol (EAP), which together with WEP, regulates access to a wireless network based on a computer-hardware specific Media Access Controller (MAC) address. EAP can be built on a secure public key encryption system to ensure only authorized network users access any local area or other network that receives the aircraft data. Other types of frequency-shift keying or phase-shift keying methods can be used for the present invention.
FIG. 4 shows an aircraft 60 with the wireless PC card 30 of the present invention incorporated with the DAU 20. The PC card 30 transmits aircraft data along a radio frequency communications signal into the skin 62 of the aircraft fuselage, which radiates the radio frequency communications signal to a location remote from the aircraft. In the present illustrated example shown in FIG. 4, the signal is transmitted to a wireless local area network having multiple access points 66 acting as receivers that connect through connection 64 into a server 68, for example, a baggage server, and into a processor 70, for example, a wireless laptop PC, which allows processing of the aircraft data that is received from the aircraft. For example, the aircraft data could be data relating to what luggage is stored in the aircraft. That luggage data is transmitted to the DAU 20 or another aircraft component. The PC card 30 of the present invention extracts the aircraft data and stores it in memory 40. The CPU 42 reads the aircraft data from the PC card memory 40, forwards the aircraft data to the transceiver 32, which transmits the aircraft data to the skin of the aircraft. The radio frequency communications signal is reradiated
Authentication Protocol (EAP), which together with WEP, regulates access to a wireless network based on a computer-hardware specific Media Access Controller (MAC) address. EAP can be built on a secure public key encryption system to ensure only authorized network users access any local area or other network that receives the aircraft data. Other types of frequency-shift keying or phase-shift keying methods can be used for the present invention.
FIG. 4 shows an aircraft 60 with the wireless PC card 30 of the present invention incorporated with the DAU 20. The PC card 30 transmits aircraft data along a radio frequency communications signal into the skin 62 of the aircraft fuselage, which radiates the radio frequency communications signal to a location remote from the aircraft. In the present illustrated example shown in FIG. 4, the signal is transmitted to a wireless local area network having multiple access points 66 acting as receivers that connect through connection 64 into a server 68, for example, a baggage server, and into a processor 70, for example, a wireless laptop PC, which allows processing of the aircraft data that is received from the aircraft. For example, the aircraft data could be data relating to what luggage is stored in the aircraft. That luggage data is transmitted to the DAU 20 or another aircraft component. The PC card 30 of the present invention extracts the aircraft data and stores it in memory 40. The CPU 42 reads the aircraft data from the PC card memory 40, forwards the aircraft data to the transceiver 32, which transmits the aircraft data to the skin of the aircraft. The radio frequency communications signal is reradiated
- 14 -(or radiated) from the aircraft skin as a passive antenna to receivers on the ground as access points of the local, area network.
Because the PC card 30 of the present invention has a receiver 32b as part of its transceiver 32 function, data can be uploaded, including control signals for specifying which portions of data are to be retrieved from the aircraft component and transmitted. Also, because the PC card of the present invention has a desired form factor, for example, a Type III PCMCIA form factor, the PC card can be connected into other PC card slots for different aircraft components, including PC
card slots that may be positioned on the aircraft engine, in the cockpit, in the cargo compartment, or in the main passenger seating area.
FIG. 5 shows different aircraft components.
For example, the DAU 20, and a second aircraft component 80, both receive the PC card 30 of the present invention.
Data could be retrieved from a FADEC 82, software updates 84, an air marshall 86, or in-flight entertainment system 88 using the PC card of the present invention, depending on which aircraft component it is coupled. Signals could be received from an air marshall 86 who is stationed on an international or other domestic flight, and later transmitted to the ground or directly to the cockpit using the PC card of the present invention, for example, interfaced to the ADU or other aircraft component.
Aircraft data could also be transmitted to a Central Maintenance Display Unit (CMDU) 90 that indicates in real-time the health and status of aircraft systems. The
Because the PC card 30 of the present invention has a receiver 32b as part of its transceiver 32 function, data can be uploaded, including control signals for specifying which portions of data are to be retrieved from the aircraft component and transmitted. Also, because the PC card of the present invention has a desired form factor, for example, a Type III PCMCIA form factor, the PC card can be connected into other PC card slots for different aircraft components, including PC
card slots that may be positioned on the aircraft engine, in the cockpit, in the cargo compartment, or in the main passenger seating area.
FIG. 5 shows different aircraft components.
For example, the DAU 20, and a second aircraft component 80, both receive the PC card 30 of the present invention.
Data could be retrieved from a FADEC 82, software updates 84, an air marshall 86, or in-flight entertainment system 88 using the PC card of the present invention, depending on which aircraft component it is coupled. Signals could be received from an air marshall 86 who is stationed on an international or other domestic flight, and later transmitted to the ground or directly to the cockpit using the PC card of the present invention, for example, interfaced to the ADU or other aircraft component.
Aircraft data could also be transmitted to a Central Maintenance Display Unit (CMDU) 90 that indicates in real-time the health and status of aircraft systems. The
-15-CMDU 90 could be located in the cockpit 92 to allow the pilot to view real-time health and status data.
The aircraft data could also comprise flight performance data or aircraft engine data received from a WEMS module 94 mounted on the FADEC 82. An example of a WEMS module is disclosed in commonly assigned U.S. patent No. 6,943,699 B2 entitled "Wireless Engine Monitoring System". Also, the aircraft data could be related to at least one of aircraft contents, passenger data, aircraft departure and arrival, or passenger transactions.
Aircraft data could also be received from a hand-held unit, such as disclosed in the '010 patent. Data can be transmitted to the flight deck if applicable.
It should be understood that the PC card 30 of the present invention can have other functions because it includes a transceiver for receiving data for on-board processing. This received data could be instructions for varying the power or frequency of a transmission. Also, various audio, video and navigation files could be uploaded and transferred from the PC card into an aircraft component, for example, an in-flight entertainment file server or the DAU, and then into other aircraft systems.
The PC card of the present invention can also be operative for transmitting aircraft data at a first higher data rate when the aircraft is on the ground, and a second, substantially lower data rate when the aircraft is airborne in close proximity to an airport, for
The aircraft data could also comprise flight performance data or aircraft engine data received from a WEMS module 94 mounted on the FADEC 82. An example of a WEMS module is disclosed in commonly assigned U.S. patent No. 6,943,699 B2 entitled "Wireless Engine Monitoring System". Also, the aircraft data could be related to at least one of aircraft contents, passenger data, aircraft departure and arrival, or passenger transactions.
Aircraft data could also be received from a hand-held unit, such as disclosed in the '010 patent. Data can be transmitted to the flight deck if applicable.
It should be understood that the PC card 30 of the present invention can have other functions because it includes a transceiver for receiving data for on-board processing. This received data could be instructions for varying the power or frequency of a transmission. Also, various audio, video and navigation files could be uploaded and transferred from the PC card into an aircraft component, for example, an in-flight entertainment file server or the DAU, and then into other aircraft systems.
The PC card of the present invention can also be operative for transmitting aircraft data at a first higher data rate when the aircraft is on the ground, and a second, substantially lower data rate when the aircraft is airborne in close proximity to an airport, for
- 16 -example, as disclosed in the above-identified '681 patent. It is also possible to transmit over a plurality of sub-band frequency channels where the frequency can be chosen based upon the position of the aircraft determined by an on-board global positioning system, as disclosed in the above-identified '238 patent. Flight management data can also be uploaded. The PC card 30 of the present invention could include the functions as disclosed in the referenced patents.
The PC card 30 of the present invention is also advantageous because it wirelessly transmits aircraft data from the aircraft without requiring an external antenna mounted on the fuselage. It has been found that the aircraft skin can be used as a passive radiator. As a result, it is possible to shorten the time and decrease the effort used in the recovery of aircraft data for off-site analysis. Experimental results have shown the advantages of this system and method.
Experiments were conducted showing the feasibility of using the aircraft skin by using an IEEE
802.11b wireless Local Area Network (LAN) card operating in a PC card slot of a laptop computer. The aircraft used was a Canadair CL-604 regional jet aircraft. The laptop for this test was placed in a rear equipment bay, which is outside of the pressure hull. It is vented to the atmosphere through a set of louvers on the belly of the aircraft. The laptop was set to run on its own battery power for the duration of the test. The importance of this fact is to note that there was no
The PC card 30 of the present invention is also advantageous because it wirelessly transmits aircraft data from the aircraft without requiring an external antenna mounted on the fuselage. It has been found that the aircraft skin can be used as a passive radiator. As a result, it is possible to shorten the time and decrease the effort used in the recovery of aircraft data for off-site analysis. Experimental results have shown the advantages of this system and method.
Experiments were conducted showing the feasibility of using the aircraft skin by using an IEEE
802.11b wireless Local Area Network (LAN) card operating in a PC card slot of a laptop computer. The aircraft used was a Canadair CL-604 regional jet aircraft. The laptop for this test was placed in a rear equipment bay, which is outside of the pressure hull. It is vented to the atmosphere through a set of louvers on the belly of the aircraft. The laptop was set to run on its own battery power for the duration of the test. The importance of this fact is to note that there was no
- 17 -coupling of the electrical systems (DC or RF) of the aircraft and the laptop cnmputer. The laptop was set to perform a "ping" operation continuously to provide a steady stream of packets for the Radio Frequency (RF) measurements.
The tests consisted of two parts. The first test was a series of measurements taken at a distance of 20 meters from the center of the aircraft (FIG. 6). The measurements were spaced 15 degrees apart with zero degrees centered on the nose of the aircraft. The second set of measurements was taken at a uniform distance of 2 meters from the closest approach to the skin of the aircraft and spaced 3 meters apart (FIG. 7).
The measurement equipment included an Agilent model 8563 EC spectrum analyzer connected through a 6 meter cable to a 2.4 GHz test antenna. The antenna was mounted on a nonconductive pole approximately 2 meters long. This height placed it at the outer bulge of the aircraft skin and above the level of local sources of multi-path and other unintentional re-radiators.
The first 20 meter test was intended to ascertain the far field pattern of radiation within the available ramp space of the airport while at a reasonably large distance from the aircraft. The second 2 meter test was intended to examine the close-in far field for point-like or line-like radiators which would contribute disproportionately to the far field pattern or conversely eliminate them as major contributors.
FIG. 6 is a polar plot superimposed on a CL-604 regional jet for the 20 meter radiated field test, and illustrates the geometry for the 20 meter data collection
The tests consisted of two parts. The first test was a series of measurements taken at a distance of 20 meters from the center of the aircraft (FIG. 6). The measurements were spaced 15 degrees apart with zero degrees centered on the nose of the aircraft. The second set of measurements was taken at a uniform distance of 2 meters from the closest approach to the skin of the aircraft and spaced 3 meters apart (FIG. 7).
The measurement equipment included an Agilent model 8563 EC spectrum analyzer connected through a 6 meter cable to a 2.4 GHz test antenna. The antenna was mounted on a nonconductive pole approximately 2 meters long. This height placed it at the outer bulge of the aircraft skin and above the level of local sources of multi-path and other unintentional re-radiators.
The first 20 meter test was intended to ascertain the far field pattern of radiation within the available ramp space of the airport while at a reasonably large distance from the aircraft. The second 2 meter test was intended to examine the close-in far field for point-like or line-like radiators which would contribute disproportionately to the far field pattern or conversely eliminate them as major contributors.
FIG. 6 is a polar plot superimposed on a CL-604 regional jet for the 20 meter radiated field test, and illustrates the geometry for the 20 meter data collection
-18-effort. The aircraft is approximately 21 meters long overall and 19 1/2 meters wingtip-to-wingtip. Thus, the first measurement was, in general, 20 meters or more from the closest point of approach to the aircraft skin.
FIG. 7 illustrates the superposition of a rectangular grid over the outline of the CL-604 aircraft for close-in fair field measurements and the transposed data points collected to determine if any strong, point-source radiators existed to account for the far field radiation pattern. These measurements used the same data collection equipment as that used in the first test.
Each circle represents one point of measurement.
The data from the first test (20 meter) was tabulated and plotted in a polar format below as later shown in the graph of FIG. 8. The angular dimension represents the stepwise progression of data points beginning with the nose of the aircraft at 0 degrees.
The radial dimension represents the received RF power in dBm at 20 meter distance at the indicated angle. Due to this representation of data it may appear somewhat counterintuitive that the most distant points have reduced power readings. FIG. 9 corrects this perceptual preference and shows a rationalized polar plot of FIG. 8.
That plot does not attempt to scale exactly the power readings, but show the relative amplitudes for comprehensibility. The tabulated data as reflected in FIGS. 8 and 9 are shown in the table below:
FIG. 7 illustrates the superposition of a rectangular grid over the outline of the CL-604 aircraft for close-in fair field measurements and the transposed data points collected to determine if any strong, point-source radiators existed to account for the far field radiation pattern. These measurements used the same data collection equipment as that used in the first test.
Each circle represents one point of measurement.
The data from the first test (20 meter) was tabulated and plotted in a polar format below as later shown in the graph of FIG. 8. The angular dimension represents the stepwise progression of data points beginning with the nose of the aircraft at 0 degrees.
The radial dimension represents the received RF power in dBm at 20 meter distance at the indicated angle. Due to this representation of data it may appear somewhat counterintuitive that the most distant points have reduced power readings. FIG. 9 corrects this perceptual preference and shows a rationalized polar plot of FIG. 8.
That plot does not attempt to scale exactly the power readings, but show the relative amplitudes for comprehensibility. The tabulated data as reflected in FIGS. 8 and 9 are shown in the table below:
-19-r O=deg 86.4"
15=deg 83.37 30. deg 84.53 45. deg 84.03 60. deg 82.53 75. deg 83.03 90. deg 82.53 105. deg 77.03 120. deg 80.2 135=deg 81.53 150-deg 75.70 165. deg 77.03 Chl := 180. deg 75.53 *
195. deg 77.2 210=deg 78.87 225. deg 75.53 240. deg 81.20 255. deg 82.37 270. deg 80.53 285. deg 86.03 300= deg 87.37 315=deg 85.37 330=deg 87.87 345. deg 83.53 360=deg 86.4) := Chi(0) r := Chi(1) I .= (-Chi)K1 (1) Chi 12 = .= I2 = 1000
15=deg 83.37 30. deg 84.53 45. deg 84.03 60. deg 82.53 75. deg 83.03 90. deg 82.53 105. deg 77.03 120. deg 80.2 135=deg 81.53 150-deg 75.70 165. deg 77.03 Chl := 180. deg 75.53 *
195. deg 77.2 210=deg 78.87 225. deg 75.53 240. deg 81.20 255. deg 82.37 270. deg 80.53 285. deg 86.03 300= deg 87.37 315=deg 85.37 330=deg 87.87 345. deg 83.53 360=deg 86.4) := Chi(0) r := Chi(1) I .= (-Chi)K1 (1) Chi 12 = .= I2 = 1000
-20-0 -86.4 1 -83.37 2 -84.53 3 -84.03 4 -82.53 -83.03 6 -82.53 I = 7 -77.03 8 -80.2 9 -81.53 -75.7 11 -77.03 12 -75.53 13 -77.2 14 -78.87 -75.53 0 11.574 1 11.995 2 11.83 3 11.901 4 12.117 5 12.044 6 12.117 I2 = 7 12.982 8 12.469 9 12.265 10 13.21 11 12.982 12 13.24 13 12.953 14 12.679 15 13.24 The smooth nature of the curve depicted in 5 FIGS. 8 and 9, with no extreme peaks or valleys, suggests either a large number of evenly distributed emitters on
-21-the fuselage of the aircraft, or alternatively, that the body or skin of the aircraft is the predominant source of the radiation. The conclusion that the body (skin) of the aircraft is the predominant source of radiation is reinforced by the small, uniform increase in amplitude in the rear hemisphere.
The RF field data from the second set of measurements for the close-in portion of the far field was plotted on a rectilinear graph based on a scaled image of the aircraft obtained from the manufacturer's maintenance manual. This transposition is shown above in FIG. 7. These data points were then incorporated in a 22 by 2 matrix, which provided a two dimensional representation of the area around the aircraft. The raw data for the non-zero matrix entries is shown below. The matrix subscripts are the x and y positions of the data point and the value of the matrix entry is the RF power expressed in dBm.
Ch27, 13 =.= -86.33 Ch23, 16 === -81.17 Ch20, 16 := -80.50 Ch17,17 := -87.67 Ch14, 22 := -83.00 Ch12, 26 =.= -80.67 = -83.00 Ch9, 28 . =
The RF field data from the second set of measurements for the close-in portion of the far field was plotted on a rectilinear graph based on a scaled image of the aircraft obtained from the manufacturer's maintenance manual. This transposition is shown above in FIG. 7. These data points were then incorporated in a 22 by 2 matrix, which provided a two dimensional representation of the area around the aircraft. The raw data for the non-zero matrix entries is shown below. The matrix subscripts are the x and y positions of the data point and the value of the matrix entry is the RF power expressed in dBm.
Ch27, 13 =.= -86.33 Ch23, 16 === -81.17 Ch20, 16 := -80.50 Ch17,17 := -87.67 Ch14, 22 := -83.00 Ch12, 26 =.= -80.67 = -83.00 Ch9, 28 . =
-22-Ch8,23 =.= -76.00 Ch9,21 =.= -75.67 Ch10,18 := -75.67 Ch8,18 := -71.83 Ch5,16 := -64.50 Ch0,13 :=-74.83 Ch5,10 := -68.17 Ch9,9 := -64.33 Ch9,7 := -71.17 Ch8,3 := -81.33 Ch8 0 .= -83.67 , Ch14,2 := -78.5 Ch16, 6 := -81.67 Ch17, 9 := -83.00 Ch22,9 := -79.50 The data in this matrix has been plotted in a three dimensional representation, which is presented in two views. The first view shown in FIG. 10 as a three dimensional perspective view of the near-skin data to assist visualization of the field strength measurements
-23-in relation to the aircraft. The second view shown in FIG. 11 is a plan view of FIG. 10, which aids in helping to determine a reasonable accuracy of the data positioning and the aircraft orientation.
Based upon these results, it was possible to create a direct comparison between the two field plots either mathematically, graphically or both. This was accomplished by converting the rectilinear coordinates of the near-skin plot to polar coordinates and plotting the data in two curves on one polar plot. Data for the results is shown below and a two curve plot of the 20 meter and 2 meter data for comparison purposes is shown in FIG. 12 for comparison purposes.
Based upon these results, it was possible to create a direct comparison between the two field plots either mathematically, graphically or both. This was accomplished by converting the rectilinear coordinates of the near-skin plot to polar coordinates and plotting the data in two curves on one polar plot. Data for the results is shown below and a two curve plot of the 20 meter and 2 meter data for comparison purposes is shown in FIG. 12 for comparison purposes.
-24-( 13.5 0.0 2.8 6.5 3.5 4.25 3.5 1.25 9.0 -0.5 12.5 -3.5 14.5 -5.2 10.3 -4.0 7.5 -2.8 4.8 -4.8 4.8 V :=
-8.25 2.8 -12.8 0.0 -8.25 -3.0 -4.0 -4.25 -4.0 -5.75 -5.25 -10.0 -5.25 -13.25 1.25 -11.25 3.00 -7.0 4.25 -4.25 9.0 -4.25
-8.25 2.8 -12.8 0.0 -8.25 -3.0 -4.0 -4.25 -4.0 -5.75 -5.25 -10.0 -5.25 -13.25 1.25 -11.25 3.00 -7.0 4.25 -4.25 9.0 -4.25
-25-(86.33\
81.17 80.50 87.67 83.00 80.67 83.00 76.00 75.67 75.67 71.83 P :=
64.5 74.83 68.17 64.33 71.17 81.33 83.67 78.5 81.67 83.00 79.5j 1:= 0,1.. 21 j := O.. 1 R. := P.
In FIG. 12 and in the data represented above, the quantities i and j are indices for the polar data plot and the change of variable from P to R is for convenience. The function 91 and "angle()" create a set of angular coordinates from a pair of rectilinear coordinates by returning the angle from the positive x axis of the coordinate pair. This function operates from
81.17 80.50 87.67 83.00 80.67 83.00 76.00 75.67 75.67 71.83 P :=
64.5 74.83 68.17 64.33 71.17 81.33 83.67 78.5 81.67 83.00 79.5j 1:= 0,1.. 21 j := O.. 1 R. := P.
In FIG. 12 and in the data represented above, the quantities i and j are indices for the polar data plot and the change of variable from P to R is for convenience. The function 91 and "angle()" create a set of angular coordinates from a pair of rectilinear coordinates by returning the angle from the positive x axis of the coordinate pair. This function operates from
-26-0 to 2n. The radial coordinates are in dBm from zero at the origin to 87.87 dBm at the periphery. As before, the dBm are actually -dB from the value at the transmitter.
( (0) (1)) := angle[ ,\V
The two curves indicate the possible mechanisms for the RF radiation pattern from the aircraft. Certain points of interest are: (a) neither curve exhibits significant variability as would be the case if the sources were a small number of discreet emission sources;
(b) the two curves almost overlay one another forward of the wing area, the region farthest from the internal RF
source. They are not grossly divergent aft of the wing area; and (c) the power level of the radiation is not decreasing at the rate of a point source, i.e., 1/r2, it is more like the emission from a line source, l/r.
Two credible mechanisms to explain the RF
radiation patterns are: (1) a large number of discreet emitters distributed fairly uniformly around the aircraft; or (2) the excitation of the aircraft skin with concomitant radiation of a uniform nature, tailing off only as a result conduction losses in the skin as the surface wave moves from the source area aft to the forward area. A third possibility is, of course, a combination of these two mechanisms.
The possibility of discrete sources distributed over the aircraft skin was explored and discarded. Two areas of possible strong radiation from openings were also examined to determine if any fuselage opening account for the strength of RF emissions. The cockpit windows and the louovered hatch into the aft equipment
( (0) (1)) := angle[ ,\V
The two curves indicate the possible mechanisms for the RF radiation pattern from the aircraft. Certain points of interest are: (a) neither curve exhibits significant variability as would be the case if the sources were a small number of discreet emission sources;
(b) the two curves almost overlay one another forward of the wing area, the region farthest from the internal RF
source. They are not grossly divergent aft of the wing area; and (c) the power level of the radiation is not decreasing at the rate of a point source, i.e., 1/r2, it is more like the emission from a line source, l/r.
Two credible mechanisms to explain the RF
radiation patterns are: (1) a large number of discreet emitters distributed fairly uniformly around the aircraft; or (2) the excitation of the aircraft skin with concomitant radiation of a uniform nature, tailing off only as a result conduction losses in the skin as the surface wave moves from the source area aft to the forward area. A third possibility is, of course, a combination of these two mechanisms.
The possibility of discrete sources distributed over the aircraft skin was explored and discarded. Two areas of possible strong radiation from openings were also examined to determine if any fuselage opening account for the strength of RF emissions. The cockpit windows and the louovered hatch into the aft equipment
-27-bay containing the laptop was examined. Placing the antenna directly in front of the cockpit window produced no change in the measured field as compared to 2 or 20 meters directly forward of the nose. A double layer of metalized mylar sheeting was placed over the louvers in the aft hatch and prior readings were repeated. An approximately 1 dB drop in received power level was observed.
The relatively smooth and similar measurements t 10 at the two distances indicate a reasonably uniform source for the radiated energy, both by way of the lack discontinuities and from the lack of a 1/r2 behavior of the power readings.
The field from an infinite conducting plate does not fall off as a function of distance. If two opposing edges of the plate are brought together to form an infinitely long conducting line, the power falls of as l/r, and further, that if the ends of the line are shrunk down to point, then the power falls off as 1/r2. This is illustrated in FIG. 13, which has been constructed to reflect the measurements obtained from the aircraft.
FIG. 13 is a graph representative of l/r and 1/r2 power roll off as a function of distance. One line is 1/r2 and another line is 1/r. The horizontal lines represent the nominal sensitivity of the wireless NIC at the indicated data rates. It should be noted that the 1/r curve appears to fit the measured data more closely than the other curve.
The minor extrapolation of the curve to aircraft skin surface shows a source strength of -35 dBm.
The actual source inside the aircraft is generating
The relatively smooth and similar measurements t 10 at the two distances indicate a reasonably uniform source for the radiated energy, both by way of the lack discontinuities and from the lack of a 1/r2 behavior of the power readings.
The field from an infinite conducting plate does not fall off as a function of distance. If two opposing edges of the plate are brought together to form an infinitely long conducting line, the power falls of as l/r, and further, that if the ends of the line are shrunk down to point, then the power falls off as 1/r2. This is illustrated in FIG. 13, which has been constructed to reflect the measurements obtained from the aircraft.
FIG. 13 is a graph representative of l/r and 1/r2 power roll off as a function of distance. One line is 1/r2 and another line is 1/r. The horizontal lines represent the nominal sensitivity of the wireless NIC at the indicated data rates. It should be noted that the 1/r curve appears to fit the measured data more closely than the other curve.
The minor extrapolation of the curve to aircraft skin surface shows a source strength of -35 dBm.
The actual source inside the aircraft is generating
-28-approximately +15 dBm, and thus, it appears that there is a 50 dB loss in coupling to the skin, 'which is a reasonable number. Based on the available data and this informal ad hoc measurement methodology, it is not unreasonable to assume that the aircraft is a combination finite line and, to a lesser degree, a finite curved surface emitter which would allow prediction of the behavior of other aircraft models and types.
These measurements make it clear that a broadband, digital communication system can be installed in the avionics bay of any aircraft and, without having to mount external anntenna, communicate reliably with the terminal offices at operationally useful distances. Some experiments were also conducted on several different models of commercial aircraft to begin answering some of these tests involved placing'a laptop within the avionics bay of different aircraft, closing up the aircraft and, using a second laptop, determine the distance away from the fuselage that the external computer could continue to communicate with the internal one. In general, it was found that this could be accomplished at a distance of 60 to 90 m with reasonable data rates. However, the coupling mechanism of the energy from one computer to the other through the aircraft's skin was not understood sufficiently to proceed with assertions that this was operationally feasible for a wide rarge of aircraft types and models. This concern generated the above data collection and analysis.
Based on the data collected and heuristic analysis, the energy is coupled from free space propagation into the skin of the aircraft which then re-
These measurements make it clear that a broadband, digital communication system can be installed in the avionics bay of any aircraft and, without having to mount external anntenna, communicate reliably with the terminal offices at operationally useful distances. Some experiments were also conducted on several different models of commercial aircraft to begin answering some of these tests involved placing'a laptop within the avionics bay of different aircraft, closing up the aircraft and, using a second laptop, determine the distance away from the fuselage that the external computer could continue to communicate with the internal one. In general, it was found that this could be accomplished at a distance of 60 to 90 m with reasonable data rates. However, the coupling mechanism of the energy from one computer to the other through the aircraft's skin was not understood sufficiently to proceed with assertions that this was operationally feasible for a wide rarge of aircraft types and models. This concern generated the above data collection and analysis.
Based on the data collected and heuristic analysis, the energy is coupled from free space propagation into the skin of the aircraft which then re-
-29-radiates the energy after an attendant propagation and/or conduction loss. This loss, measured at any given point in the radiation pattern close to the aircraft skin, is typically on the order of 40 to 50 dB from the source power level.
In predicting the available RE' power at any given operationally useful range, the aircraft can be viewed as a collection of line radiators. This is a conservative, but reasonable conclusion. A subsidiary conclusion is that the field will be fairly uniform in the forward hemisphere of the aircraft. This tentative conclusion is based on an aft placement of the RF source.
In predicting the available RE' power at any given operationally useful range, the aircraft can be viewed as a collection of line radiators. This is a conservative, but reasonable conclusion. A subsidiary conclusion is that the field will be fairly uniform in the forward hemisphere of the aircraft. This tentative conclusion is based on an aft placement of the RF source.
-30-
Claims (9)
1. A system for transmitting data from an aircraft having a skin comprising:
an aircraft component; and a PC card comprising a PC card body having a PCMCIA form factor and a processor, memory and radio transmitter operative with each other, said PC card being interfaced to the aircraft component and configured to acquire aircraft data from the aircraft component and store the aircraft data within the memory, wherein said processor is configured to retrieve the aircraft data from said memory and forward said aircraft data to said radio transmitter for transmitting the aircraft data over a radio frequency communications signal and passively coupling the RF energy into the skin of the aircraft, which is operative as a passive radiator to re-radiate the radio frequency communications signal to a location remote from the aircraft such that the RF communications signal is transmitted without use of a separate antenna mounted on the aircraft.
an aircraft component; and a PC card comprising a PC card body having a PCMCIA form factor and a processor, memory and radio transmitter operative with each other, said PC card being interfaced to the aircraft component and configured to acquire aircraft data from the aircraft component and store the aircraft data within the memory, wherein said processor is configured to retrieve the aircraft data from said memory and forward said aircraft data to said radio transmitter for transmitting the aircraft data over a radio frequency communications signal and passively coupling the RF energy into the skin of the aircraft, which is operative as a passive radiator to re-radiate the radio frequency communications signal to a location remote from the aircraft such that the RF communications signal is transmitted without use of a separate antenna mounted on the aircraft.
2. A system according to Claim 1, wherein said aircraft component comprises a Data Acquisition Unit that records flight data.
3. A system according to Claim 1, wherein the radio frequency communications signal comprises a spread spectrum communications signal.
4. A system according to Claim 1, wherein said aircraft data comprises flight performance data.
5. A system according to Claim 1, wherein the aircraft data comprises data relating to one of aircraft contents, passenger data, aircraft departure and arrival, passenger transactions or data from a sky marshal.
6. A method of transmitting aircraft data comprising:
acquiring data within a memory of a PC card comprising a PC
card body having a PCMCIA form factor and that is interfaced with an aircraft component; retrieving the aircraft data from the memory based on commands received from a processor contained within the PC card; and transmitting the retrieved aircraft data from a transmitter contained within the PC card along a radio frequency communications signal and passively coupling RF energy into the skin of the aircraft, which is operative as a passive radiator to re-radiate the radio frequency communications signal to a location remote from the aircraft such that the RF communications signal is transmitted without use of a separate antenna mounted on the aircraft.
acquiring data within a memory of a PC card comprising a PC
card body having a PCMCIA form factor and that is interfaced with an aircraft component; retrieving the aircraft data from the memory based on commands received from a processor contained within the PC card; and transmitting the retrieved aircraft data from a transmitter contained within the PC card along a radio frequency communications signal and passively coupling RF energy into the skin of the aircraft, which is operative as a passive radiator to re-radiate the radio frequency communications signal to a location remote from the aircraft such that the RF communications signal is transmitted without use of a separate antenna mounted on the aircraft.
7. A method according to Claim 6, which further comprises transmitting the aircraft data over a spread spectrum communications signal.
8. A method according to Claim 6, wherein the aircraft data is related to at least one of aircraft contents, passenger data, aircraft departure and arrival, passenger transactions or data from a sky marshal.
9. A method according to Claim 6, which further comprises collecting data from a Data Acquisition Unit (DAU) relating to the flight performance of the aircraft.
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PCT/US2005/032592 WO2007013878A2 (en) | 2004-09-16 | 2005-09-14 | System and method of transmitting data from an aircraft |
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Families Citing this family (79)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7107062B2 (en) * | 1992-03-06 | 2006-09-12 | Aircell, Inc. | System for managing call handoffs between an aircraft and multiple cell sites |
US8060083B2 (en) | 2000-10-11 | 2011-11-15 | Gogo Llc | System for managing an aircraft-oriented emergency services call in an airborne wireless cellular network |
US8914022B2 (en) | 1992-03-06 | 2014-12-16 | Gogo Llc | System for providing high speed communications service in an airborne wireless cellular network |
US8081968B2 (en) | 2000-10-11 | 2011-12-20 | Gogo Llc | System for creating an air-to-ground IP tunnel in an airborne wireless cellular network to differentiate individual passengers |
US8452276B2 (en) | 2000-10-11 | 2013-05-28 | Gogo Llc | Differentiated services code point mirroring for wireless communications |
US8457627B2 (en) | 1999-08-24 | 2013-06-04 | Gogo Llc | Traffic scheduling system for wireless communications |
US8081969B2 (en) | 2000-10-11 | 2011-12-20 | Gogo Llc | System for creating an aircraft-based internet protocol subnet in an airborne wireless cellular network |
US20080039997A1 (en) * | 2003-11-10 | 2008-02-14 | Aeromechanical Services Ltd. | Aircraft flight data management system |
US7620374B2 (en) * | 2004-09-16 | 2009-11-17 | Harris Corporation | System and method of transmitting data from an aircraft |
US9576404B2 (en) | 2004-09-16 | 2017-02-21 | Harris Corporation | System and method of transmitting data from an aircraft |
US8944822B2 (en) * | 2005-07-22 | 2015-02-03 | Appareo Systems, Llc | Synchronized video and synthetic visualization system and method |
US7848698B2 (en) | 2005-07-22 | 2010-12-07 | Appareo Systems Llc | Flight training and synthetic flight simulation system and method |
US7646712B2 (en) * | 2005-10-17 | 2010-01-12 | Searete Llc | Using a signal route dependent on a node speed change prediction |
US20070087695A1 (en) * | 2005-10-17 | 2007-04-19 | Searete Llc, A Limited Liability Corporation Of The State Of Delaware | Mobile directional antenna |
US8125896B2 (en) | 2005-10-17 | 2012-02-28 | The Invention Science Fund I, Llc | Individualizing a connectivity-indicative mapping |
US8495239B2 (en) * | 2005-10-17 | 2013-07-23 | The Invention Science Fund I, Llc | Using a signal route dependent on a node speed change prediction |
US7350717B2 (en) * | 2005-12-01 | 2008-04-01 | Conner Investments, Llc | High speed smart card with flash memory |
FR2903384B1 (en) * | 2006-07-04 | 2009-05-29 | Airbus France Sas | FLIGHT CONTROL SYSTEM FOR AIRCRAFT, AND TEST SYSTEM FOR TESTING SUCH A FLIGHT CONTROL SYSTEM. |
US7486960B2 (en) * | 2006-09-15 | 2009-02-03 | Thales Avionics, Inc. | System and method for wirelessly transferring content to and from an aircraft |
US9172481B2 (en) | 2012-07-20 | 2015-10-27 | Appareo Systems, Llc | Automatic multi-generational data caching and recovery |
US8116922B2 (en) * | 2006-09-25 | 2012-02-14 | Appareo Systems, Llc | Method for resolving ground level errors in simulations |
US9047717B2 (en) | 2006-09-25 | 2015-06-02 | Appareo Systems, Llc | Fleet operations quality management system and automatic multi-generational data caching and recovery |
US7616449B2 (en) * | 2006-09-25 | 2009-11-10 | Appareo Systems, Llc | Crash-hardened memory device and method of creating the same |
US9202318B2 (en) | 2006-09-25 | 2015-12-01 | Appareo Systems, Llc | Ground fleet operations quality management system |
US8565943B2 (en) * | 2006-09-25 | 2013-10-22 | Appereo Systems, LLC | Fleet operations quality management system |
US20090030563A1 (en) * | 2007-07-26 | 2009-01-29 | United Technologies Corp. | Systems And Methods For Providing Localized Heat Treatment Of Metal Components |
US20090070841A1 (en) * | 2007-09-12 | 2009-03-12 | Proximetry, Inc. | Systems and methods for delivery of wireless data and multimedia content to aircraft |
US7835734B2 (en) * | 2007-09-20 | 2010-11-16 | Honeywell International Inc. | System and method for wireless routing of data from an aircraft |
US8195118B2 (en) | 2008-07-15 | 2012-06-05 | Linear Signal, Inc. | Apparatus, system, and method for integrated phase shifting and amplitude control of phased array signals |
US8054204B2 (en) * | 2009-05-29 | 2011-11-08 | United Technologies Corporation | Method for remotely updating wireless sensors |
CN102483865B (en) * | 2009-08-11 | 2016-02-24 | 航空力学服务有限公司 | There is automated aircraft flight data transmission and the management system of demand model |
US8872719B2 (en) | 2009-11-09 | 2014-10-28 | Linear Signal, Inc. | Apparatus, system, and method for integrated modular phased array tile configuration |
DE102010000909B4 (en) * | 2010-01-14 | 2017-06-22 | Airbus Operations Gmbh | Apparatus for providing radio frequency signal connections |
US8539217B2 (en) * | 2010-01-25 | 2013-09-17 | Honeywell International Inc. | Method and system to facilitate data transfer to a device |
SG184817A1 (en) * | 2010-04-12 | 2012-11-29 | Flight Focus Pte Ltd | Use of a meta language for processing of aviation related messages |
US8965291B2 (en) | 2010-07-13 | 2015-02-24 | United Technologies Corporation | Communication of avionic data |
US8326359B2 (en) * | 2010-08-03 | 2012-12-04 | Honeywell International Inc. | Reconfigurable wireless modem adapter |
US8301196B2 (en) * | 2010-08-03 | 2012-10-30 | Honeywell International Inc. | Reconfigurable wireless modem adapter including diversity/MIMO modems |
CN102331331A (en) | 2011-06-20 | 2012-01-25 | 中国国际航空股份有限公司 | Method for detecting performance of onboard oxygen of aircraft |
US9141830B2 (en) | 2011-07-22 | 2015-09-22 | Aspen Avionics, Inc. | Avionics gateway interface, systems and methods |
US8634972B2 (en) | 2011-08-30 | 2014-01-21 | General Electric Company | Method and system for integrating engine control and flight control system |
US8768534B2 (en) * | 2011-11-14 | 2014-07-01 | Arinc Incorporated | Method and apparatus for using electronic flight bag (EFB) to enable flight operations quality assurance (FOQA) |
CN103116320A (en) * | 2011-11-17 | 2013-05-22 | 中航商用航空发动机有限责任公司 | Distributed type aero-engine full authority digital engine control (FADEC) system |
US9816897B2 (en) | 2012-06-06 | 2017-11-14 | Harris Corporation | Wireless engine monitoring system and associated engine wireless sensor network |
US9758252B2 (en) | 2012-08-23 | 2017-09-12 | General Electric Company | Method, system, and apparatus for reducing a turbine clearance |
CN104181908B (en) * | 2013-05-22 | 2017-12-01 | 中国国际航空股份有限公司 | A kind of DFDAU test platform and method of testing |
CN104184758B (en) | 2013-05-22 | 2017-12-12 | 中国国际航空股份有限公司 | A kind of test platform and method of testing of airborne vehicle message triggering logic |
WO2014210215A1 (en) * | 2013-06-25 | 2014-12-31 | Fedex Corporation | Transport communication management |
US9563580B2 (en) * | 2013-07-25 | 2017-02-07 | North Flight Data Systems, LLC | System, methodology, and process for wireless transmission of sensor data onboard an aircraft to a portable electronic device |
US10885010B2 (en) | 2013-12-18 | 2021-01-05 | Federal Express Corporation | Methods and systems for data structure optimization |
DE102013021500A1 (en) * | 2013-12-18 | 2015-06-18 | Northrop Grumman Litef Gmbh | Flight data recorders with redundant ejectable flight data storage modules |
US9419846B2 (en) | 2014-01-03 | 2016-08-16 | Honeywell International Inc. | Integrated wireless module |
US9520919B2 (en) * | 2014-01-30 | 2016-12-13 | Simmonds Precision Products, Inc. | Magnetic wireless ground data link for aircraft health monitoring |
US9826039B2 (en) | 2014-02-04 | 2017-11-21 | Honeywell International Inc. | Configurable communication systems and methods for communication |
US9346562B2 (en) * | 2014-04-03 | 2016-05-24 | Textron Innovations, Inc. | Aircraft troubleshooting network |
US9403602B1 (en) * | 2014-05-09 | 2016-08-02 | Rockwell Collins, Inc. | Architecture independent event driven transponders and position reporting devices |
FR3035290B1 (en) * | 2015-04-16 | 2018-11-30 | Airbus Operations | ELECTRONIC CARD AND CORRESPONDING SIGNAL ACQUISITION AND GENERATION SYSTEM COMPRISING ONE OR MORE DIGITAL PROGRAMMABLE MATRIX SWITCHES |
US10575029B1 (en) * | 2015-09-28 | 2020-02-25 | Rockwell Collins, Inc. | Systems and methods for in-flight entertainment content transfer using fiber optic interface |
US9934620B2 (en) | 2015-12-22 | 2018-04-03 | Alula Aerospace, Llc | System and method for crowd sourcing aircraft data communications |
US10035609B2 (en) | 2016-03-08 | 2018-07-31 | Harris Corporation | Wireless engine monitoring system for environmental emission control and aircraft networking |
CN105892353B (en) * | 2016-03-30 | 2018-06-08 | 深圳市中联宇航科技有限公司 | A kind of aircraft data collecting transmitter |
US9824513B2 (en) | 2016-04-14 | 2017-11-21 | United Airlines, Inc. | Method of detecting elevator tab failure |
US10410441B2 (en) | 2016-05-16 | 2019-09-10 | Wi-Tronix, Llc | Real-time data acquisition and recording system viewer |
US11423706B2 (en) | 2016-05-16 | 2022-08-23 | Wi-Tronix, Llc | Real-time data acquisition and recording data sharing system |
US10392038B2 (en) | 2016-05-16 | 2019-08-27 | Wi-Tronix, Llc | Video content analysis system and method for transportation system |
US9934623B2 (en) | 2016-05-16 | 2018-04-03 | Wi-Tronix Llc | Real-time data acquisition and recording system |
US9926086B2 (en) * | 2016-05-26 | 2018-03-27 | The Boeing Company | Apparatus and method for wirelessly managing aircraft health data |
US10839620B2 (en) | 2016-09-23 | 2020-11-17 | Honeywell International Inc. | Apparatus and method for manually activated wireless transfer of operational and performance data |
WO2019033021A1 (en) | 2017-08-10 | 2019-02-14 | Appareo Systems, Llc | Ads-b transponder system and method |
CN107733459B (en) * | 2017-09-15 | 2023-07-04 | 中国汽车技术研究中心 | Vehicle-mounted T-Box based on DSRC and low-altitude satellite communication and application thereof |
US11250847B2 (en) | 2018-07-17 | 2022-02-15 | Appareo Systems, Llc | Wireless communications system and method |
US11018754B2 (en) * | 2018-08-07 | 2021-05-25 | Appareo Systems, Llc | RF communications system and method |
US11012146B2 (en) | 2019-02-11 | 2021-05-18 | Pratt & Whitney Canada Corp. | System and method for aircraft data transmission |
EP3751438A1 (en) * | 2019-06-14 | 2020-12-16 | Airbus Operations GmbH | On-board computing system for an aircraft |
EP3799349B1 (en) | 2019-09-26 | 2023-11-08 | General Electric Company | Communicating securely with devices in a distributed control system |
WO2021108577A1 (en) | 2019-11-27 | 2021-06-03 | Appareo Systems, Llc | Aviation connectivity gateway module for cellular connectivity |
US11275369B2 (en) | 2020-04-28 | 2022-03-15 | Cirrus Design Corporation | Mobile device application-based aircraft data storage and communication system |
US20210371121A1 (en) * | 2020-06-01 | 2021-12-02 | Federal Express Corporation | Methods, Systems, and Apparatuses For a Wireless Storage Device |
CN115840223B (en) * | 2023-02-15 | 2023-05-09 | 成都熵泱科技有限公司 | Unmanned aerial vehicle detection system and method capable of identifying target attribute |
Family Cites Families (57)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0164341B1 (en) * | 1983-11-17 | 1989-10-18 | The Boeing Company | Automatic fault reporting system |
US4642775A (en) * | 1984-05-25 | 1987-02-10 | Sundstrand Data Control, Inc. | Airborne flight planning and information system |
US4729102A (en) * | 1984-10-24 | 1988-03-01 | Sundstrand Data Control, Inc. | Aircraft data acquisition and recording system |
US4716417A (en) * | 1985-02-13 | 1987-12-29 | Grumman Aerospace Corporation | Aircraft skin antenna |
US4675863A (en) * | 1985-03-20 | 1987-06-23 | International Mobile Machines Corp. | Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels |
US4872182A (en) * | 1988-03-08 | 1989-10-03 | Harris Corporation | Frequency management system for use in multistation H.F. communication network |
US4943919A (en) * | 1988-10-17 | 1990-07-24 | The Boeing Company | Central maintenance computer system and fault data handling method |
GB8915406D0 (en) | 1989-07-05 | 1989-08-23 | Bristow Helicopters | Aircraft health and usage monitoring system |
US5142480A (en) * | 1990-02-27 | 1992-08-25 | Iimorrow, Inc. | Method and apparatus for providing an indication as to whether an aircraft can safely glide to a selected destination |
US5073900A (en) * | 1990-03-19 | 1991-12-17 | Mallinckrodt Albert J | Integrated cellular communications system |
US5233626A (en) * | 1992-05-11 | 1993-08-03 | Space Systems/Loral Inc. | Repeater diversity spread spectrum communication system |
US5359446A (en) * | 1992-09-10 | 1994-10-25 | Eldec Corporation | Wide-angle, high-speed, free-space optical communications system |
JPH06132715A (en) * | 1992-10-19 | 1994-05-13 | Mitsubishi Heavy Ind Ltd | Print antenna |
US5483656A (en) * | 1993-01-14 | 1996-01-09 | Apple Computer, Inc. | System for managing power consumption of devices coupled to a common bus |
GB9304896D0 (en) | 1993-03-10 | 1993-05-19 | Gec Ferranti Defence Syst | Data recorder |
US6393281B1 (en) * | 1993-03-26 | 2002-05-21 | At&T Wireless Services Inc | Seamless hand-off for air-to-ground systems |
US5445347A (en) * | 1993-05-13 | 1995-08-29 | Hughes Aircraft Company | Automated wireless preventive maintenance monitoring system for magnetic levitation (MAGLEV) trains and other vehicles |
US5351194A (en) | 1993-05-14 | 1994-09-27 | World Wide Notification Systems, Inc. | Apparatus and method for closing flight plans and locating aircraft |
US5463656A (en) * | 1993-10-29 | 1995-10-31 | Harris Corporation | System for conducting video communications over satellite communication link with aircraft having physically compact, effectively conformal, phased array antenna |
US5459469A (en) * | 1994-02-04 | 1995-10-17 | Stanford Telecommunications, Inc. | Air traffic surveillance and communication system |
US5521958A (en) | 1994-04-29 | 1996-05-28 | Harris Corporation | Telecommunications test system including a test and trouble shooting expert system |
JPH07305652A (en) * | 1994-05-10 | 1995-11-21 | Yamaha Motor Co Ltd | Cylinder head for internal combustion engine |
US5652717A (en) * | 1994-08-04 | 1997-07-29 | City Of Scottsdale | Apparatus and method for collecting, analyzing and presenting geographical information |
JPH08304497A (en) * | 1995-05-10 | 1996-11-22 | Mitsubishi Heavy Ind Ltd | Estimation device of radio wave of aircraft |
US5761625A (en) * | 1995-06-07 | 1998-06-02 | Alliedsignal Inc. | Reconfigurable algorithmic networks for aircraft data management |
US5757772A (en) * | 1995-09-18 | 1998-05-26 | Telefonaktiebolaget Lm Ericsson | Packet switched radio channel traffic supervision |
US5943399A (en) * | 1995-09-29 | 1999-08-24 | Northern Telecom Limited | Methods and apparatus for providing communications to telecommunications terminals |
US6047165A (en) * | 1995-11-14 | 2000-04-04 | Harris Corporation | Wireless, frequency-agile spread spectrum ground link-based aircraft data communication system |
US6522867B1 (en) * | 1995-11-14 | 2003-02-18 | Harris Corporation | Wireless, frequency-agile spread spectrum ground link-based aircraft data communication system with wireless unit in communication therewith |
FR2762169B1 (en) * | 1997-04-10 | 1999-06-25 | Aerospatiale | DATA LINK SYSTEM BETWEEN AN AIRCRAFT AND THE GROUND AND FAILURE SURVIVAL METHOD |
US5978862A (en) * | 1997-08-08 | 1999-11-02 | Toshiba America Information Systems, Inc. | PCMCIA card dynamically configured in first mode to program FPGA controlling application specific circuit and in second mode to operate as an I/O device |
US6359446B1 (en) * | 1997-09-25 | 2002-03-19 | Jack R. Little, Jr. | Apparatus and method for nondestructive testing of dielectric materials |
US6098133A (en) * | 1997-11-28 | 2000-08-01 | Motorola, Inc. | Secure bus arbiter interconnect arrangement |
US6181990B1 (en) * | 1998-07-30 | 2001-01-30 | Teledyne Technologies, Inc. | Aircraft flight data acquisition and transmission system |
US6097343A (en) * | 1998-10-23 | 2000-08-01 | Trw Inc. | Conformal load-bearing antenna system that excites aircraft structure |
US6278913B1 (en) * | 1999-03-12 | 2001-08-21 | Mil-Com Technologies Pte Ltd. | Automated flight data management system |
US6154636A (en) * | 1999-05-14 | 2000-11-28 | Harris Corporation | System and method of providing OOOI times of an aircraft |
US6148179A (en) * | 1999-06-25 | 2000-11-14 | Harris Corporation | Wireless spread spectrum ground link-based aircraft data communication system for engine event reporting |
US6163681A (en) * | 1999-06-25 | 2000-12-19 | Harris Corporation | Wireless spread spectrum ground link-based aircraft data communication system with variable data rate |
US6167238A (en) * | 1999-06-25 | 2000-12-26 | Harris Corporation | Wireless-based aircraft data communication system with automatic frequency control |
US6173159B1 (en) * | 1999-06-25 | 2001-01-09 | Harris Corporation | Wireless spread spectrum ground link-based aircraft data communication system for updating flight management files |
US6160998A (en) * | 1999-06-25 | 2000-12-12 | Harris Corporation | Wireless spread spectrum ground link-based aircraft data communication system with approach data messaging download |
US6167239A (en) * | 1999-06-25 | 2000-12-26 | Harris Corporation | Wireless spread spectrum ground link-based aircraft data communication system with airborne airline packet communications |
US6198445B1 (en) * | 1999-12-29 | 2001-03-06 | Northrop Grumman Corporation | Conformal load bearing antenna structure |
US6721640B2 (en) * | 2000-02-03 | 2004-04-13 | Honeywell International Inc. | Event based aircraft image and data recording system |
CN1152379C (en) * | 2000-06-29 | 2004-06-02 | 扬智科技股份有限公司 | Coder/decoder system of optical disk drive |
CN1352493A (en) * | 2000-11-13 | 2002-06-05 | 李亮 | Public mobile communication device in passenger airplane |
US6671589B2 (en) * | 2001-02-13 | 2003-12-30 | William Holst | Method and apparatus to support remote and automatically initiated data loading and data acquisition of airborne computers using a wireless spread spectrum aircraft data services link |
US6577500B2 (en) * | 2001-02-28 | 2003-06-10 | 3Com Corporation | Wireless PC card |
US6816728B2 (en) * | 2002-04-24 | 2004-11-09 | Teledyne Technologies Incorporated | Aircraft data communication system and method |
US6915189B2 (en) * | 2002-10-17 | 2005-07-05 | Teledyne Technologies Incorporated | Aircraft avionics maintenance diagnostics data download transmission system |
JP2005219651A (en) * | 2004-02-06 | 2005-08-18 | Mitsubishi Heavy Ind Ltd | Airplane antenna and airplane |
US7397429B2 (en) * | 2004-03-09 | 2008-07-08 | Northrop Grumman Corporation | Aircraft window plug antenna assembly |
US7489992B2 (en) * | 2004-04-12 | 2009-02-10 | Sagem Avionics, Inc. | Method and system for remotely communicating and interfacing with aircraft condition monitoring systems |
US7103456B2 (en) * | 2004-04-12 | 2006-09-05 | Sagem Avionics, Inc. | PCMCIA card for remotely communicating and interfacing with aircraft condition monitoring systems |
US20060007914A1 (en) * | 2004-07-08 | 2006-01-12 | Praphul Chandra | Dynamic call parameter switchover and graceful degradation for optimizing VoIP performance in wireless local area networks |
US7620374B2 (en) * | 2004-09-16 | 2009-11-17 | Harris Corporation | System and method of transmitting data from an aircraft |
-
2004
- 2004-09-16 US US10/942,630 patent/US7620374B2/en active Active
-
2005
- 2005-09-14 JP JP2007532403A patent/JP4620736B2/en not_active Expired - Fee Related
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- 2007-09-05 US US11/899,349 patent/US8744372B2/en active Active
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- 2014-04-09 US US14/248,696 patent/US9191053B2/en active Active
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WO2007013878A2 (en) | 2007-02-01 |
CA2580658A1 (en) | 2007-02-01 |
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EP1800409B1 (en) | 2015-03-11 |
WO2007013878A3 (en) | 2007-04-12 |
JP4620736B2 (en) | 2011-01-26 |
US7620374B2 (en) | 2009-11-17 |
CN101023589A (en) | 2007-08-22 |
US20140206303A1 (en) | 2014-07-24 |
JP2008514117A (en) | 2008-05-01 |
US9191053B2 (en) | 2015-11-17 |
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