Processing of satellite navigation system signals and related receive-signal verification
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01S-019/21
G01S-019/09
G01S-019/14
출원번호
US-0665046
(2008-06-24)
등록번호
US-8471763
(2013-06-25)
우선권정보
GB-0712376.3 (2007-06-26)
국제출원번호
PCT/IB2008/052504
(2008-06-24)
§371/§102 date
20100915
(20100915)
국제공개번호
WO2009/001294
(2008-12-31)
발명자
/ 주소
Daems, Frank C. H.
Peeters, Johan F. J.
출원인 / 주소
NXP B.V.
인용정보
피인용 횟수 :
0인용 특허 :
7
초록▼
A system implements a location based service, and comprises a satellite navigation receiver implementing a position tracking function for providing the location of a user of the service. An analogue RF receiver receives satellite signals and performs at least a frequency downconversion. Correlation
A system implements a location based service, and comprises a satellite navigation receiver implementing a position tracking function for providing the location of a user of the service. An analogue RF receiver receives satellite signals and performs at least a frequency downconversion. Correlation and decoding functions are applied to the downconverted signals for deriving location information from detected specific satellite signals. The system further comprises a server for receiving samples of the downconverted signals, and for verifying the samples are consistent with the expected satellite signals at that time and location. The invention provides a counter measure for detecting the counterfeiting of, or tampering with, the satellite signals at the receiver. A check can be made that the received satellite signals correspond to those which are expected at that location and time.
대표청구항▼
1. A system implementing a location based service, comprising: a mobile satellite navigation receiver implementing a position tracking function for providing a location of a user of the service,wherein the mobile satellite navigation receiver includes: an analogue RF receiver for receiving satellite
1. A system implementing a location based service, comprising: a mobile satellite navigation receiver implementing a position tracking function for providing a location of a user of the service,wherein the mobile satellite navigation receiver includes: an analogue RF receiver for receiving satellite signals and performing at least a frequency downconversion;a first signal processing circuit for performing correlation functions to the downconverted signals for detecting specific satellite signals; anda decoder for deriving location information from the detected specific satellite signals; anda second signal processing circuit for receiving samples of the downconverted signals from the mobile satellite navigation receiver and verifying that the samples are consistent with signals expected for the time and location at which the specific satellite signals are detected, wherein the expected satellite signals are derived from, or correspond to signals representing, an analysis of the downconverted signals from a plurality of users at the same time and in close proximity to each other. 2. A system as claimed in claim 1, further comprising a timing generator for defining a time at which the samples of downconverted signals for multiple users are provided to a server. 3. A system as claimed in claim 2, wherein the timing generator generates a random timestamp. 4. A method of determining a location of a user device of a system which implements a location based service, the method comprising: the user device receiving satellite signals and performing at least a frequency downconversion in a mobile receiver;the user device providing the downconverted signals to signal processing circuitry within the mobile receiver for performing correlation functions to the downconverted signals for detecting specific satellite signals and to decoding circuitry for deriving location information from the detected specific satellite signals,the user device providing samples of the downconverted signals from the mobile receiver to a service provider, andthe service provider verifying the samples are consistent with satellite signals expected for the time and location at which the specific satellite signals are detected, wherein the expected satellite signals are derived from an analysis of the downconverted signals from a plurality of user devices at the same time and in close proximity to each other. 5. A method as claimed in claim 4, further comprising defining a time at which the samples of downconverted signals for multiple users are provided to a server. 6. A method as claimed in claim 5, wherein defining a time comprises generating a random timestamp. 7. A system for implementing a location based service, the system comprising: a mobile satellite navigation receiver implementing a position tracking function for providing a location of a user of the service,wherein the mobile satellite navigation receiver includes: an analogue RF receiver for receiving satellite signals and performing at least a frequency downconversion;a signal processor that performs correlation functions to the downconverted signals for detecting specific satellite signals; anda decoder that derives location information from the detected specific satellite signals; anda receiver that obtains samples of the downconverted signals from the mobile satellite navigation receiver, and verifies that the samples are consistent with-signals expected for the time and location at which the specific satellite signals are detected, wherein the expected satellite signals are derived from an analysis of the downconverted signals from a plurality of users at the same time and in close proximity to each other. 8. A system as claimed in claim 7, further comprising a timing generator for defining a time at which the samples of downconverted signals for multiple users are provided to a server. 9. A system as claimed in claim 8, wherein the timing generator generates a random timestamp. 10. A method of determining a location of a user of a system which implements a location based service, the method comprising: the user receiving satellite signals and performing at least a frequency downconversion in a mobile receiver;the user providing the downconverted signals to a signal processor within the mobile receiver for performing correlation functions to the downconverted signals for detecting specific satellite signals and to a decoder that derives location information from the detected specific satellite signals,the user providing samples of the downconverted signals from the mobile receiver to a service provider, andthe service provider verifying the samples are consistent with satellite signals expected for the time and location at which the specific satellite signals are detected by defining a time, which includes generating a random timestamp, at which the samples of downconverted signals are provided to the service provider. 11. A method as claimed in claim 10, wherein the expected satellite signals are derived from the determined location, time and the satellite positions at said time. 12. A method of determining a location of a user of a system which implements a location based service, the method comprising: the user receiving satellite signals and performing at least a frequency downconversion in a mobile receiver;the user providing the downconverted signals to a signal processor within the mobile receiver for performing correlation functions to the downconverted signals for detecting specific satellite signals and to a decoder that derives location information from the detected specific satellite signals,the user providing samples of the downconverted signals from the mobile receiver to a service provider, andthe service provider verifying the samples are consistent with satellite signals expected for the time and location at which the specific satellite signals are detected, wherein the expected satellite signals are derived from an analysis of the downconverted signals from a plurality of users at the same time and in close proximity to each other. 13. A method as claimed in claim 12, further comprising defining a time at which the samples of downconverted signals for multiple users are provided to a server. 14. A method as claimed in claim 13, wherein defining a time comprises generating a random timestamp. 15. A system implementing a location based service, comprising: a mobile satellite navigation receiver implementing a position tracking function for providing a location of a user of the service,wherein the mobile satellite navigation receiver includes: an analogue RF receiver for receiving satellite signals and performing at least a frequency downconversion;a first signal processing circuit for performing correlation functions to the downconverted signals for detecting specific satellite signals; anda decoder for deriving location information from the detected specific satellite signals; anda second signal processing circuit for receiving samples of the downconverted signals from the mobile satellite navigation receiver and verifying that the samples are consistent with signals expected for the time and location at which the specific satellite signals are detected, wherein the second signal processing circuit verifies that that the samples are consistent with the expected signals based on the previously decoded location information. 16. A system implementing a location based service, comprising: a mobile satellite navigation receiver implementing a position tracking function for providing a location of a user of the service,wherein the mobile satellite navigation receiver includes: an analogue RF receiver for receiving satellite signals and performing at least a frequency downconversion;a first signal processing circuit for performing correlation functions to the downconverted signals for detecting specific satellite signals; anda decoder for deriving location information from the detected specific satellite signals; anda second signal processing circuit for receiving samples of the downconverted signals from the mobile satellite navigation receiver and verifying that the samples are consistent with signals expected for the time and location at which the specific satellite signals are detected, wherein the second signal processing circuit verifies that that the samples are consistent with the expected signals based on a set of previously decoded positions. 17. A method of determining a location of a user of a system which implements a location based service, the method comprising: the user receiving satellite signals and performing at least a frequency downconversion in a mobile receiver;the user providing the downconverted signals to signal processing circuitry within the mobile receiver for performing correlation functions to the downconverted signals for detecting specific satellite signals and to decoding circuitry for deriving location information from the detected specific satellite signals,the user providing samples of the downconverted signals from the mobile receiver to a service provider, andthe service provider verifying the samples are consistent with satellite signals expected for the time and location at which the specific satellite signals are detected, wherein verifying the samples are consistent with the expected signals is based on the previously decoded location information. 18. A method of determining a location of a user of a system which implements a location based service, the method comprising: the user receiving satellite signals and performing at least a frequency downconversion in a mobile receiver;the user providing the downconverted signals to signal processing circuitry within the mobile receiver for performing correlation functions to the downconverted signals for detecting specific satellite signals and to decoding circuitry for deriving location information from the detected specific satellite signals,the user providing samples of the downconverted signals from the mobile receiver to a service provider, andthe service provider verifying the samples are consistent with satellite signals expected for the time and location at which the specific satellite signals are detected, wherein verifying the samples are consistent with the expected signals is based on a set of previously decoded positions. 19. A system for implementing a location based service, the system comprising: a mobile satellite navigation receiver implementing a position tracking function for providing a location of a user of the service,wherein the mobile satellite navigation receiver includes: an analogue RF receiver for receiving satellite signals and performing at least a frequency downconversion;a signal processor that performs correlation functions to the downconverted signals for detecting specific satellite signals; anda decoder that derives location information from the detected specific satellite signals; anda receiver that obtains samples of the downconverted signals from the mobile satellite navigation receiver, and verifies that the samples are consistent with-signals expected for the time and location at which the specific satellite signals are detected, wherein the second signal processing circuit verifies that that the samples are consistent with the expected signals based on the previously decoded location information. 20. A system for implementing a location based service, the system comprising: a mobile satellite navigation receiver implementing a position tracking function for providing a location of a user of the service,wherein the mobile satellite navigation receiver includes: an analogue RF receiver for receiving satellite signals and performing at least a frequency downconversion;a signal processor that performs correlation functions to the downconverted signals for detecting specific satellite signals; anda decoder that derives location information from the detected specific satellite signals; anda receiver that obtains samples of the downconverted signals from the mobile satellite navigation receiver, and verifies that the samples are consistent with-signals expected for the time and location at which the specific satellite signals are detected, wherein the second signal processing circuit verifies that that the samples are consistent with the expected signals based on a set of previously decoded positions. 21. A method of determining a location of a user of a system which implements a location based service, the method comprising: the user receiving satellite signals and performing at least a frequency downconversion in a mobile receiver;the user providing the downconverted signals to a signal processor within the mobile receiver for performing correlation functions to the downconverted signals for detecting specific satellite signals and to a decoder that derives location information from the detected specific satellite signals,the user providing samples of the downconverted signals from the mobile receiver to a service provider, andthe service provider verifying the samples are consistent with satellite signals expected for the time and location at which the specific satellite signals are detected, wherein verifying the samples are consistent with the expected signals is based on the previously decoded location information. 22. A method of determining a location of a user of a system which implements a location based service, the method comprising: the user receiving satellite signals and performing at least a frequency downconversion in a mobile receiver;the user providing the downconverted signals to a signal processor within the mobile receiver for performing correlation functions to the downconverted signals for detecting specific satellite signals and to a decoder that derives location information from the detected specific satellite signals,the user providing samples of the downconverted signals from the mobile receiver to a service provider, andthe service provider verifying the samples are consistent with satellite signals expected for the time and location at which the specific satellite signals are detected, wherein verifying the samples are consistent with the expected signals is based on a set of previously decoded positions.
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이 특허에 인용된 특허 (7)
Krasner Norman F. (San Carlos CA), GPS receiver and method for processing GPS signals.
Bromley, Patrick G.; Jandrell, Louis H. M.; Wise, Michael D., Method and system for processing positioning signals based on predetermined message data segment.
Fenton Patrick (Calgary CA CAX) Van Dierendonck Albert J. (Los Altos CA), Pseudorandom noise ranging receiver which compensates for multipath distortion by dynamically adjusting the time delay s.
Hladik Stephen Michael ; Check William Alan ; Glinsman Brian James ; Fleming ; III Robert Fleming, Satellite communications system utilizing parallel concatenated coding.
Emmons, Jr., Thomas Peter; Peters, Robert Anthony; Hogberg, Shawn, Satellite-based communications system with terrestrial repeater and method therefor.
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