Directly acquiring precision code GPS signals

Patent 6856282 Issued on February 15, 2005. Estimated Expiration Date:

October 29, 2022. 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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Inventors

Assignee

Qualcomm Incorporated

Application

No. 10283677 filed on 10/29/2002

US Classes:

342/357.15, Satellite selection (i.e., tracking or acquisition)342/357.06, Using Global Positioning Satellite (GPS or Glonass)342/357.09, With transmission of location-indicative information to or from a remote station375/365, Synchronization word342/357.12, GPS receiver signal processing342/357.07, Tracking or monitoring (i.e., lost or stolen vehicles)342/357.1, Combined with telecommunication342/357.03, Using differential correction455/456.1Location monitoring

Examiners

Primary: Phan, Dao

Attorney, Agent or Firm

International Class

H04B007/185

Abstract

In general, the invention is directed to techniques for directly acquiring P-codes without first acquiring C/A-codes. For example, in one embodiment, a system comprises an assist server to track a P-code signal from a Global Positioning System (GPS) satellite and generate acquisition assistance information from the signal. The system further comprises a mobile unit to receive the acquisition assistance data from the assist server, and to acquire the P-code signal from the satellite based on the acquisition assistance data. The acquisition assistance data may include time-of-week data indicating an initial time offset into a P-code pseudorandom code sequence for the satellite. The mobile unit may include a reference generator to locally generate a reference pseudorandom code sequence based on the time-of-week data.

Other References

Wolfert R et al, “Direct P(Y)-Code Acquisition Under A Jamming Environment”, Position Location and Navigation Symposium, IEEE 1998 Palm Springs, CA, Apr. 20-23, 1998, pp. 228-235.