CA2634677A1 - Method and apparatus for measurement processing of satellite positioning system (sps) signals - Google Patents
Method and apparatus for measurement processing of satellite positioning system (sps) signals Download PDFInfo
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- CA2634677A1 CA2634677A1 CA002634677A CA2634677A CA2634677A1 CA 2634677 A1 CA2634677 A1 CA 2634677A1 CA 002634677 A CA002634677 A CA 002634677A CA 2634677 A CA2634677 A CA 2634677A CA 2634677 A1 CA2634677 A1 CA 2634677A1
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- 238000000034 method Methods 0.000 title claims abstract 36
- 238000005259 measurement Methods 0.000 title claims abstract 18
- 238000012545 processing Methods 0.000 title claims abstract 13
- 238000004891 communication Methods 0.000 claims abstract 17
- 230000010267 cellular communication Effects 0.000 claims abstract 7
- 230000001413 cellular effect Effects 0.000 claims abstract 7
- 230000000644 propagated effect Effects 0.000 claims 6
- 238000005314 correlation function Methods 0.000 claims 3
- 230000005540 biological transmission Effects 0.000 claims 2
- 238000012360 testing method Methods 0.000 claims 2
- 230000010354 integration Effects 0.000 claims 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/20—Instruments for performing navigational calculations
- G01C21/206—Instruments for performing navigational calculations specially adapted for indoor navigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
- G01S1/04—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/03—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
- G01S19/09—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing processing capability normally carried out by the receiver
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/20—Integrity monitoring, fault detection or fault isolation of space segment
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/21—Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/22—Multipath-related issues
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/28—Satellite selection
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/30—Acquisition or tracking or demodulation of signals transmitted by the system code related
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/40—Correcting position, velocity or attitude
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/01—Determining conditions which influence positioning, e.g. radio environment, state of motion or energy consumption
- G01S5/011—Identifying the radio environment
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/01—Determining conditions which influence positioning, e.g. radio environment, state of motion or energy consumption
- G01S5/012—Identifying whether indoors or outdoors
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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
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/34—Power consumption
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/42—Determining position
- G01S19/50—Determining position whereby the position solution is constrained to lie upon a particular curve or surface, e.g. for locomotives on railway tracks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S2205/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S2205/001—Transmission of position information to remote stations
- G01S2205/008—Transmission of position information to remote stations using a mobile telephone network
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/0009—Transmission of position information to remote stations
- G01S5/0018—Transmission from mobile station to base station
- G01S5/0036—Transmission from mobile station to base station of measured values, i.e. measurement on mobile and position calculation on base station
Abstract
A method and apparatus is disclosed for measurement processing of Satellite Positioning System (SPS) signals. A
plurality of SPS signals from a corresponding plurality of SPS
satellites are received in an SPS receiver. The signal environment corresponding to the location in which the SPS
receiver is located is characterized to produce signal environment data. In one exemplary embodiment, an information source, such as a cellular network based database, is searched to retrieve the signal environment data given an approximate location of the GPS receiver. This approximate location may be specified by a location of a cell site which is in cellular radio communication with a cellular communication device which is co-located with the GPS receiver. One or more parameters related to signal characteristics of the satellite signals are defined. Threshold values for the parameters are determined using the signal environment data. Code phases corresponding to times of arrival of respective satellite signals from the plurality of satellites are measured. The data representing measured times of arrival are examined using threshold values for the parameters to produce a set of times of arrival from which a location fix for the GPS receiver is calculated. Other methods and apparatuses for other embodiments of the invention are also described.
plurality of SPS signals from a corresponding plurality of SPS
satellites are received in an SPS receiver. The signal environment corresponding to the location in which the SPS
receiver is located is characterized to produce signal environment data. In one exemplary embodiment, an information source, such as a cellular network based database, is searched to retrieve the signal environment data given an approximate location of the GPS receiver. This approximate location may be specified by a location of a cell site which is in cellular radio communication with a cellular communication device which is co-located with the GPS receiver. One or more parameters related to signal characteristics of the satellite signals are defined. Threshold values for the parameters are determined using the signal environment data. Code phases corresponding to times of arrival of respective satellite signals from the plurality of satellites are measured. The data representing measured times of arrival are examined using threshold values for the parameters to produce a set of times of arrival from which a location fix for the GPS receiver is calculated. Other methods and apparatuses for other embodiments of the invention are also described.
Claims (33)
1. A method of measuring times of arrival of satellite signals received in a Satellite Positioning System (SPS) receiver, said method comprising:
receiving a plurality of SPS signals from a plurality of SPS satellites;
characterizing a signal environment corresponding to the location in which said SPS receiver is located, to produce environment data which represents a manner in which SPS signals are propagated locally to said location;
measuring times of arrival of respective satellite signals from two or more satellites of said plurality of satellites; and processing data representing said times of arrival using said environment data to produce a set of times of arrival with which to calculate a location fix for said SPS
receiver.
receiving a plurality of SPS signals from a plurality of SPS satellites;
characterizing a signal environment corresponding to the location in which said SPS receiver is located, to produce environment data which represents a manner in which SPS signals are propagated locally to said location;
measuring times of arrival of respective satellite signals from two or more satellites of said plurality of satellites; and processing data representing said times of arrival using said environment data to produce a set of times of arrival with which to calculate a location fix for said SPS
receiver.
2. The method of claim 1 wherein said environment data comprises at least one of a signal-to-noise ratio, a signal-to-interference ratio, an input signal strength, a signal attenuation, a correlation function waveform, and a peak-width value of a signal of said plurality of signals.
3. A method as in claim 1 wherein SPS signals are propagated locally to said location when said SPS signals are within about 1000 meters of said location.
4. A method as in claim 3 wherein said characterizing comprises determining whether said signal environment resembles an indoor environment or an outdoor environment.
5. A method as in claim 3 further comprising:
identifying one or more errant SPS signals;
correcting time-of-arrival measurements performed by said SPS receiver as a result of identifying one or more errant SPS signals.
identifying one or more errant SPS signals;
correcting time-of-arrival measurements performed by said SPS receiver as a result of identifying one or more errant SPS signals.
6. A method as in claim 3 wherein said SPS receiver is included within a combination receiver and radio communication device, said combination receiver comprising a digital processor configured to process said data representing said times of arrival using said environment data.
7. A method as in claim 6 wherein said radio communication device is a cellular communication system which processes a cellular communication signal and wherein said characterizing comprises determining a signal parameter of said cellular communication signal.
8. A method as in claim 3 wherein said set of times of arrival are transmitted to a basestation over a communication link.
9. A method as in claim 3 further comprising:
determining a first possible correlation peak for a first set of SPS signals from a first SPS satellite;
determining a second possible correlation peak for said first set of SPS signals;
transmitting from said SPS receiver which received said first set of SPS signals an identification that said first and said second possible correlation peaks have been determined.
determining a first possible correlation peak for a first set of SPS signals from a first SPS satellite;
determining a second possible correlation peak for said first set of SPS signals;
transmitting from said SPS receiver which received said first set of SPS signals an identification that said first and said second possible correlation peaks have been determined.
10. A method as in claim 3 wherein a time-of-arrival measurement of said set of times of arrival is corrected with a bias adjustment based on said signal environment.
11. A method of measuring times of arrival of satellite signals received in a Satellite Positioning System (SPS) receiver, said method comprising:
receiving a plurality of SPS signals from a plurality of SPS satellites;
characterizing a signal environment corresponding to the location in which said SPS receiver is located, to produce environment data;
selecting threshold values for one or more parameters related to one or more characteristics of said satellite signals using said environment data;
measuring times of arrival of respective satellite signals from two or more satellites of said plurality of satellites, to produce a plurality of measured times of arrival; and testing data representing said times of arrival using said threshold values for said one or more parameters to produce a set of times of arrival with which to calculate a location fix for said SPS receiver.
receiving a plurality of SPS signals from a plurality of SPS satellites;
characterizing a signal environment corresponding to the location in which said SPS receiver is located, to produce environment data;
selecting threshold values for one or more parameters related to one or more characteristics of said satellite signals using said environment data;
measuring times of arrival of respective satellite signals from two or more satellites of said plurality of satellites, to produce a plurality of measured times of arrival; and testing data representing said times of arrival using said threshold values for said one or more parameters to produce a set of times of arrival with which to calculate a location fix for said SPS receiver.
12. The method of claim 11 wherein one or more characteristics of said environment data comprises at least one of a signal-to-noise ratio, a signal-to-interference ratio, an input signal strength, a signal attenuation, a correlation function waveform, and a peak-width value of a signal of said plurality of signals.
13. The method of claim 12 wherein said characterizing said signal environment further comprises characterizing said signal environment as an indoor environment if said SPS
receiver receives said plurality of SPS signals while located inside a building, or as an outdoor environment if said SPS receiver receives said plurality of SPS signals while not located inside a building.
receiver receives said plurality of SPS signals while located inside a building, or as an outdoor environment if said SPS receiver receives said plurality of SPS signals while not located inside a building.
14. The method of claim 13 wherein said characterizing said signal environment further comprises characterizing said signal environment as an urban environment if said SPS
receiver receives said plurality of SPS signals while located in an area with a pre-defined number of buildings, or as a rural environment if said SPS receiver receives said plurality of SPS signals while located in an area with fewer than said pre-defined number of buildings.
receiver receives said plurality of SPS signals while located in an area with a pre-defined number of buildings, or as a rural environment if said SPS receiver receives said plurality of SPS signals while located in an area with fewer than said pre-defined number of buildings.
15. The method of claim 12 further comprising:
identifying one or more errant SPS signals; and correcting time-of-arrival measurements performed by said SPS receiver as a result of identifying one or more errant SPS signals.
identifying one or more errant SPS signals; and correcting time-of-arrival measurements performed by said SPS receiver as a result of identifying one or more errant SPS signals.
16. The method of claim 15 further comprising:
estimating a bias error in one or more measured times of arrival of said plurality of measured times of arrival, to produce an estimated bias value; and correcting said plurality of measured times of arrival using said estimated bias value.
estimating a bias error in one or more measured times of arrival of said plurality of measured times of arrival, to produce an estimated bias value; and correcting said plurality of measured times of arrival using said estimated bias value.
17. The method of claim 16 further comprising:
defining an error threshold for each measured time-of-arrival using said environment data;
comparing an error in said each measured time-of-arrival with said error threshold; and removing a time-of-arrival measurement if said error in said time-of-arrival measurement exceeds said error threshold.
defining an error threshold for each measured time-of-arrival using said environment data;
comparing an error in said each measured time-of-arrival with said error threshold; and removing a time-of-arrival measurement if said error in said time-of-arrival measurement exceeds said error threshold.
18. The method of claim 13 wherein said SPS receiver is included within a combination receiver and radio communication device, said combination receiver comprising a digital processor configured to execute said measuring said times of arrival of said satellite signals.
19. The method of claim 11 wherein said characterizing said signal environment comprises determining at least one of a signal-to-noise ratio, a signal-to-interference ratio, an input signal strength, a signal attenuation, a correlation function waveform, and a peak-width value of at least one signal of said plurality of SPS signals.
20. The method of claim 18 wherein said radio communication device comprises a cellular telephone, and wherein said location of said SPS receiver is within a cellular telephone transmission region.
21. A method as in claim 11 wherein said characterizing said signal environment comprises determining at least one of a signal-to-noise ratio, a signal-to-interference ratio, a signal strength, or a peak width value of a cellular communication signal which is received by a cellular communication system, wherein said SPS receiver and said cellular communication system are coupled together and are part of a combined system.
22. A SPS receiver apparatus comprising:
an antenna for receiving SPS signals at an RF
frequency from a plurality of inview satellites;
a downconverter coupled to said antenna, said downconverter reducing the RF frequency of said received SPS
signals to an intermediate frequency (IF) to produce a baseband signal;
a digitizer coupled to said downconverter;
a processor coupled to said digitizer, wherein said processor is configured to:
determine a signal environment corresponding to the location in which said SPS receiver is located, to produce environment data;
select threshold values for one or more parameters related to one or more characteristics of said satellite signals using said environment data;
measure times of arrival of respective satellite signals from two or more satellites of said plurality of in-view satellites, to produce a plurality of measured times of arrival; and test data representing said times of arrival using said threshold values for said one or more parameters to produce a set of times of arrival with which to calculate a location fix for said SPS receiver.
an antenna for receiving SPS signals at an RF
frequency from a plurality of inview satellites;
a downconverter coupled to said antenna, said downconverter reducing the RF frequency of said received SPS
signals to an intermediate frequency (IF) to produce a baseband signal;
a digitizer coupled to said downconverter;
a processor coupled to said digitizer, wherein said processor is configured to:
determine a signal environment corresponding to the location in which said SPS receiver is located, to produce environment data;
select threshold values for one or more parameters related to one or more characteristics of said satellite signals using said environment data;
measure times of arrival of respective satellite signals from two or more satellites of said plurality of in-view satellites, to produce a plurality of measured times of arrival; and test data representing said times of arrival using said threshold values for said one or more parameters to produce a set of times of arrival with which to calculate a location fix for said SPS receiver.
23. The SPS receiver apparatus of claim 22 further comprising a communication antenna and a communication receiver coupled to said communication antenna and to said processor, said communication receiver operable to receive a data signal containing satellite data information over a communication link.
24. The SPS receiver apparatus of claim 23 wherein said set of times of arrival are transmitted to a basestation over said communication link.
25. The SPS receiver apparatus of claim 24 wherein said characteristics of said satellite signals are transmitted to said basestation over said communication link and said characteristics are used to derive said environment data.
26. The SPS receiver apparatus of claim 24 wherein said communication link comprises a cellular telephone transmission link.
27. The SPS receiver apparatus of claim 26 wherein said environment data specifies whether said SPS receiver is located indoors or outdoors, and whether said SPS receiver is located in an urban or rural location.
28. The SPS receiver apparatus of claim 27 wherein said environment data is input to said SPS receiver by a user.
29. The SPS receiver apparatus of claim 27 wherein said environment data is determined by analyzing data transmitted by said communication link.
30. A method of processing satellite positioning system (SPS) signals, said method comprising:
determining a signal environment data which represents a manner in which SPS signals are propagated in a location at which an SPS receiver is located, wherein said signal environment data comprises data representing at least one of multipath conditions or interference conditions for SPS signals near said location;
determining how data representing SPS signals received by said SPS receiver is processed based on said signal environment data;
transmitting measurements representing time-of-arrivals of SPS signals at said SPS receiver;
receiving at a remote processing system said measurements representing time-of-arrivals through a cellular radio frequency communication link;
processing at said remote processing system said measurements representing time-of-arrivals to determine a position solution for said SPS receiver.
determining a signal environment data which represents a manner in which SPS signals are propagated in a location at which an SPS receiver is located, wherein said signal environment data comprises data representing at least one of multipath conditions or interference conditions for SPS signals near said location;
determining how data representing SPS signals received by said SPS receiver is processed based on said signal environment data;
transmitting measurements representing time-of-arrivals of SPS signals at said SPS receiver;
receiving at a remote processing system said measurements representing time-of-arrivals through a cellular radio frequency communication link;
processing at said remote processing system said measurements representing time-of-arrivals to determine a position solution for said SPS receiver.
31. A method of processing satellite positioning system (SPS) signals, said method comprising:
determining from a cell based information source a signal environment which represents a manner in which SPS
signals are propagated in a location at which an SPS
receiver is located;
determining how data representing SPS signals received by said SPS receiver is processed based on said signal environment;
determining measurements representing time-of-arrivals of SPS signals, said measurements based on said signal environment;
transmitting said measurements representing time-of-arrivals of SPS signals at said SPS receiver;
receiving at a remote processing system said measurements representing time-of-arrivals through a cellular radio frequency communication link;
processing at said remote processing system said measurements representing time-of-arrivals to determine a position solution for said SPS receiver.
determining from a cell based information source a signal environment which represents a manner in which SPS
signals are propagated in a location at which an SPS
receiver is located;
determining how data representing SPS signals received by said SPS receiver is processed based on said signal environment;
determining measurements representing time-of-arrivals of SPS signals, said measurements based on said signal environment;
transmitting said measurements representing time-of-arrivals of SPS signals at said SPS receiver;
receiving at a remote processing system said measurements representing time-of-arrivals through a cellular radio frequency communication link;
processing at said remote processing system said measurements representing time-of-arrivals to determine a position solution for said SPS receiver.
32. A method of processing satellite positioning system (SPS) signals, said method comprising:
determining a signal environment data which represents a manner in which SPS signals are propagated in a location at which an SPS receiver is located, wherein said signal environment data comprises data representing at least one of multipath conditions or interference conditions for SPS signals near said location;
determining how data representing SPS signals received by said SPS receiver is processed based on said signal environment data, wherein said determining determines an integration time used to perform a time-of-arrival measurement for SPS signals from at least one SPS satellite.
determining a signal environment data which represents a manner in which SPS signals are propagated in a location at which an SPS receiver is located, wherein said signal environment data comprises data representing at least one of multipath conditions or interference conditions for SPS signals near said location;
determining how data representing SPS signals received by said SPS receiver is processed based on said signal environment data, wherein said determining determines an integration time used to perform a time-of-arrival measurement for SPS signals from at least one SPS satellite.
33. A method of processing satellite positioning system (SPS) signals, said method comprising:
determining a signal environment data which represents a manner in which SPS signals are propagated in a location at which an SPS receiver is located, wherein said signal environment data comprises data representing at least one of multipath conditions or interference conditions for SPS signals near said location;
determining how data representing SPS signals received by said SPS receiver is processed based on said signal environment data;
determining an SPS time-of-arrival measurement;
correcting said time-of-arrival measurement with a bias adjustment based on said signal environment.
determining a signal environment data which represents a manner in which SPS signals are propagated in a location at which an SPS receiver is located, wherein said signal environment data comprises data representing at least one of multipath conditions or interference conditions for SPS signals near said location;
determining how data representing SPS signals received by said SPS receiver is processed based on said signal environment data;
determining an SPS time-of-arrival measurement;
correcting said time-of-arrival measurement with a bias adjustment based on said signal environment.
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