CA2129539A1 - Frequency Tuning for Satellite Ground Stations - Google Patents

Frequency Tuning for Satellite Ground Stations

Info

Publication number
CA2129539A1
CA2129539A1 CA2129539A CA2129539A CA2129539A1 CA 2129539 A1 CA2129539 A1 CA 2129539A1 CA 2129539 A CA2129539 A CA 2129539A CA 2129539 A CA2129539 A CA 2129539A CA 2129539 A1 CA2129539 A1 CA 2129539A1
Authority
CA
Canada
Prior art keywords
frequency
terminal
satellite
offset
signals
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2129539A
Other languages
French (fr)
Other versions
CA2129539C (en
Inventor
Archana M. Gharpuray
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DirecTV Group Inc
Original Assignee
Archana M. Gharpuray
Hughes Aircraft Company
He Holdings, Inc.
Hughes Electronics Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Archana M. Gharpuray, Hughes Aircraft Company, He Holdings, Inc., Hughes Electronics Corporation filed Critical Archana M. Gharpuray
Publication of CA2129539A1 publication Critical patent/CA2129539A1/en
Application granted granted Critical
Publication of CA2129539C publication Critical patent/CA2129539C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • H04B7/204—Multiple access
    • H04B7/208—Frequency-division multiple access [FDMA]

Abstract

2129539 9414251 PCTABS00032 A satellite communications network tuning system which consumes very little communications bandwidth. The network has a first terminal (10) for transmitting and receiving signals, a second terminal (20-1, 20-2) in communication with the first (10) for transmitting signals and a satellite (22) for receiving signals from the terminals and retransmitting them. The frequency of the retransmitted signals is offset from the frequency at which the signals were received. A method according to the present invention for compensating the transmit frequency of the second terminal (20-1, 20-2) for the satellite frequency offset comprises transmitting a signal from the first terminal (10) to the satellite (22) at a first frequency, receiving the retransmitted signal from the satellite (22) at the first terminal (10) at a second frequency, the second frequency being offset from the first frequency by the satellite (22), measuring, at the first terminal, the difference between the first frequency and the second frequency to obtain an offset, transmitting the offset from the first terminal (10) to the second terminal (20-1, 20-2), and adjusting the transmit frequency of the second terminal (20-1, 20-2) using the offset.
CA002129539A 1992-12-04 1993-12-06 Frequency tuning for satellite ground stations Expired - Fee Related CA2129539C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/986,845 US5471657A (en) 1992-12-04 1992-12-04 Frequency tuning for satellite ground stations
US07/986,845 1992-12-04

Publications (2)

Publication Number Publication Date
CA2129539A1 true CA2129539A1 (en) 1994-06-23
CA2129539C CA2129539C (en) 1999-04-13

Family

ID=25532816

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002129539A Expired - Fee Related CA2129539C (en) 1992-12-04 1993-12-06 Frequency tuning for satellite ground stations

Country Status (5)

Country Link
US (1) US5471657A (en)
EP (1) EP0626116A4 (en)
AU (1) AU5740394A (en)
CA (1) CA2129539C (en)
WO (1) WO1994014251A1 (en)

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5619528A (en) * 1993-04-16 1997-04-08 Trans Video Electronics High speed teleconference system
US6356740B1 (en) * 1995-06-30 2002-03-12 Hughes Electronics Corporation Method and system of frequency stabilization in a mobile satellite communication system
US5898903A (en) * 1996-03-14 1999-04-27 Alligator Communications, Inc. Multiple address radio system having automatic radio calibration for reducing frequency offset between radio frequency carriers
US5926746A (en) * 1996-11-08 1999-07-20 Qualcomm Incorporated Frequency and other parameter adjustment using training channel
US6058147A (en) * 1997-03-03 2000-05-02 Telogy Networks, Inc. Intelligent carrier acquisition method for satellite communications
US6240276B1 (en) * 1998-04-28 2001-05-29 Ericsson Inc. Compensating for errors in tuning frequency of a global positioning satellite (GPS) receiver
US7777675B2 (en) 1999-03-05 2010-08-17 Era Systems Corporation Deployable passive broadband aircraft tracking
US8446321B2 (en) 1999-03-05 2013-05-21 Omnipol A.S. Deployable intelligence and tracking system for homeland security and search and rescue
US7612716B2 (en) 1999-03-05 2009-11-03 Era Systems Corporation Correlation of flight track data with other data sources
US7908077B2 (en) 2003-06-10 2011-03-15 Itt Manufacturing Enterprises, Inc. Land use compatibility planning software
US7739167B2 (en) 1999-03-05 2010-06-15 Era Systems Corporation Automated management of airport revenues
US6885340B2 (en) 2000-02-29 2005-04-26 Rannoch Corporation Correlation of flight track data with other data sources
US7889133B2 (en) 1999-03-05 2011-02-15 Itt Manufacturing Enterprises, Inc. Multilateration enhancements for noise and operations management
US7570214B2 (en) 1999-03-05 2009-08-04 Era Systems, Inc. Method and apparatus for ADS-B validation, active and passive multilateration, and elliptical surviellance
US8203486B1 (en) 1999-03-05 2012-06-19 Omnipol A.S. Transmitter independent techniques to extend the performance of passive coherent location
US7667647B2 (en) 1999-03-05 2010-02-23 Era Systems Corporation Extension of aircraft tracking and positive identification from movement areas into non-movement areas
US7782256B2 (en) 1999-03-05 2010-08-24 Era Systems Corporation Enhanced passive coherent location techniques to track and identify UAVs, UCAVs, MAVs, and other objects
US6560440B1 (en) 2000-10-10 2003-05-06 General Dynamics Decision Systems, Inc. Method for precompensating frequency data for use in high-velocity satellite communication systems
US6982964B2 (en) * 2001-10-15 2006-01-03 Beering David R High performance ECL-to-ATM protocol network gateway
GB2388264A (en) * 2002-01-10 2003-11-05 Roke Manor Research GPS based networked time synchronised unit
US7965227B2 (en) 2006-05-08 2011-06-21 Era Systems, Inc. Aircraft tracking using low cost tagging as a discriminator
US8027285B1 (en) * 2007-06-15 2011-09-27 Vt Idirect, Inc. Method to eliminate frequency offset introduced in a network
US8068448B1 (en) * 2007-06-15 2011-11-29 Vt Idirect, Inc. Apparatus, system, and computer program for synchronizing communications

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2524228A1 (en) * 1982-03-26 1983-09-30 Thomson Csf SATELLITE TELECOMMUNICATIONS SYSTEM

Also Published As

Publication number Publication date
EP0626116A4 (en) 1995-04-19
WO1994014251A1 (en) 1994-06-23
EP0626116A1 (en) 1994-11-30
CA2129539C (en) 1999-04-13
AU5740394A (en) 1994-07-04
US5471657A (en) 1995-11-28

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed