Method of doppler searching in a digital GPS receiver

Details Method of doppler searching in a digital GPS receiver Method of doppler searching in a digital GPS receiver

1985-09-03

1987-10-20

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

342418, 342357, 364576, H04K 100

Patent

active

047019344

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.

REFERENCES:
patent: 4313197 (1982-01-01), Maxemchuk
patent: 4412325 (1983-10-01), Molo
patent: 4453165 (1984-06-01), Maine
patent: 4457006 (1984-06-01), Maine
patent: 4494238 (1985-01-01), Groth, Jr.

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