Method of doppler searching in a digital GPS receiver
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United States of America Patent
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Oct 20, 1987
Grant Date -
N/A
app pub date -
Sep 3, 1985
filing date -
Sep 3, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved method of doppler searching in a digital GPS receiver is described. According to the principles of the present invention, an N-point fourier transform is performed on samples of a down converted GPS signal representing the entire range of Doppler-shifted GPS carrier frequencies. The magnitude of the square of each of the output samples is calculated to produce N power quantities, corresponding to N search frequencies. The power quantities for each of the N search frequencies are then summed to produce N quantities proportional to average power. The maximum of the N-power quantities indicates the presence of the corresponding GPS signal.
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