Analog compression of GPS C/A signal to audio bandwidth
First Claim
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1. A method for compressing a Global Positioning System (GPS) signal, comprising:
- receiving the GPS signal from a remote location via a wireless communications link;
removing a carrier component of the GPS signal;
matching a comb filter to the GPS signal to obtain a first output signal comprising filter lines;
frequency shifting the filter lines in the first output signal to produce a compressed GPS signal by mixing the first output signal with a plurality of outputs from at least one frequency generator;
receiving an assist signal from a base station via a wireless communications link; and
removing telemetry data and Doppler from the first resultant signal using the assist signal.
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Abstract
The present invention discloses analog methods and circuits for compression of the GPS C/A signal to audio bandwidths to improve TTFF times, as well as decreasing auto correlation errors in systems that employ the methods and devices disclosed.
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Citations
10 Claims
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1. A method for compressing a Global Positioning System (GPS) signal, comprising:
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receiving the GPS signal from a remote location via a wireless communications link; removing a carrier component of the GPS signal; matching a comb filter to the GPS signal to obtain a first output signal comprising filter lines; frequency shifting the filter lines in the first output signal to produce a compressed GPS signal by mixing the first output signal with a plurality of outputs from at least one frequency generator; receiving an assist signal from a base station via a wireless communications link; and removing telemetry data and Doppler from the first resultant signal using the assist signal. - View Dependent Claims (2, 3)
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4. A method for compressing a Global Positioning System (GPS) signal, comprising:
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receiving the GPS signal from a remote location via a wireless communications link; removing a carrier component of the GPS signal to produce a first resultant signal; filtering the first resultant signal through a comb filter to produce a second resultant signal that includes a plurality of signals dispersed over a frequency spectrum; generating a plurality of mixing signals at selected frequencies; mixing the second resultant signal with the plurality of mixing signals to produce a first compressed GPS signal; receiving an assist signal from a base station via a wireless communications link; and removing telemetry data and Doppler from the first resultant signal using the assist signal. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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Specification