Reliable position location in memory limited environment

Details Reliable position location in memory limited environment Reliable position location in memory limited environment

1998-09-09

2001-02-27

Tarcza, Thomas H. (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

C342S357490

Reexamination Certificate

active

06195041

ABSTRACT:

BACKGROUND OF THE INVENTION
I. Field of the Invention
The present invention relates to position location. More particularly, the present invention relates to a novel and improved method and apparatus for performing position location in wireless communications system.
II. Description of the Related Art
Both government regulation and consumer demand have driven the demand for position location functionality in cellular telephones. The global positioning system (GPS) is currently available for performing position location using a GPS receiver in conjunction with a set of earth orbiting satellites. It is therefore desirable to introduce GPS functionality into a cellular telephone.
Cellular telephones, however, are extremely sensitive to cost, weight and power consumption considerations. Thus, simply adding additional circuitry for performing GPS location is an unsatisfactory solution for providing position location functionality in a cellular telephone. Thus, the present invention is directed to providing GPS functionality in a cellular telephone system with a minimum of additional hardware, cost and power consumption.
SUMMARY OF THE INVENTION
The present invention is a novel and improved method and apparatus for performing position location in wireless communications system. One embodiment comprises a method for performing position location in a wireless communication system using a set of signals transmitted from a set of satellites including the steps of receiving signal samples, rotating an acquisition code by a first rotation amount yielding a rotated acquisition code, despreading said signal samples using rotated acquisition code yielding despread data, accumulating said despread data over a first duration yielding partially accumulated data, rotating said partially accumulated data by a second rotation amount yielding rotated data and accumulating said rotated data.


REFERENCES:
patent: 5420592 (1995-05-01), Johnson
patent: 5495499 (1996-02-01), Fenton et al.
patent: 5663734 (1997-09-01), Krasner
patent: 0488739 (1992-06-01), None
Article Entitled “Global Positioning System Overview”, by Dana, published on website at www.host.cc.utexas.edu, Sep. 1994 revised Feb. 15, 1998 pp. 1-12.
Article entitled “Spread Spectrum Code Acquisition In the Presence of Doppler Shift and Data Modulation”, IEEE Transactions on Comm., vol. 38 No. 2 Feb. 1990 pp. 241-250.
Understanding GPS Principles and Applications,/ Kaplan, Elliott D.. Boston MA: Artech House, 1996 Chapters 4 and 5.

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