GPS receiver utilizing a communication link

Patent 6064336 Issued on May 16, 2000. Estimated Expiration Date:

August 5, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventor

Krasner, Norman F.

Assignee

SnapTrack, Inc.

Application

No. 129599 filed on 08/05/1998

US Classes:

342/357.05, Using Doppler frequency shift342/357.09, With transmission of location-indicative information to or from a remote station342/357.1, Combined with telecommunication701/214Means to improve accuracy of position or location

Examiners

Primary: Blum, Theodore M.

Attorney, Agent or Firm

Blakely, Sokoloff, Taylor & Zafman

Foreign Patent References

0444738 EP. 04/13/1991
0447978 EP. 09/13/1991
0512789 EP. 11/13/1992
0545636 EP. 06/13/1993
0604404 EP. 06/13/1994
4424412 DE. 12/13/1994
2264837 GB. 09/13/1993
2273218 GB. 06/13/1994
2308033 GB. 11/13/1997
WO9428434 WO. 12/13/1994
WO9615636 WO. 05/13/1996
WO9714049 WO. 04/13/1997

International Classes

H04B 007/185
G01S 005/02

Abstract

A precision carrier frequency signal for calibrating a local oscillator of a GPS receiver which is used to acquire GPS signals. The precision carrier frequency signal is used to calibrate the local oscillator such that the output of the local oscillator, which is used to acquire GPS signals, is modified by a reference signal generated from the precision carrier frequency signal. The GPS receiver locks to this precision carrier frequency signal and generates the reference signal. In another aspect of the invention, satellite almanac data is transmitted to a remote GPS receiver unit from a basestation via a communication link. The remote GPS receiver unit uses this satellite almanac data to determine approximate Doppler data for satellites in view of the remote GPS receiver unit.

Other References

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