System and method for receiving and decoding global positioning satellite signals
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United States of America Patent
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Dec 14, 1993
Grant Date -
N/A
app pub date -
Aug 26, 1991
filing date -
Aug 26, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system receives and demodulates spread spectrum positional signals such as those generated by a GPS satellite by frequency shifting the signals substantially to baseband and utilizing digital signal processing techniques. The digital signal processing techniques utilized can be implemented by a standard audio digital signal processor due to the circuit design. The spread spectrum signal is frequency shifted substantially to baseband, forming in-phase and quadrature components which are processed substantially in parallel. Pseudo-range, carrier phase and doppler frequency, and the underlying data are thereby derived.
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