Audio verification system and technique for GPS receivers

Details Audio verification system and technique for GPS receivers Audio verification system and technique for GPS receivers

1984-10-31

1990-03-20

Tarcza, Thomas H.

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

Directive

Beacon or receiver

342356, G01S 502

Patent

active

049105256

ABSTRACT:
There is disclosed a system and technique for providing an audio verification of Global Positioning System (GPS) receiver signal acquisition. In a GPS receiver, the correlated output of the GPS signal is generally represented as a data modified CW signal with a Doppler component caused by the movement of a GPS satellite with respect to the receiver. Due to the Doppler component, this signal output provides a signature which is indicative of the particular satellite from which the signal is being received. The signal output is mixed with a local oscillator to produce a beat frequency in the audio band which may be filtered and coupled to an audio amplifier to produce an audio tone. The presence of the audio tone indicates the acquisition of a selected satellite signal and its audio frequency is indicative of the particular satellite signal being received.

REFERENCES:
patent: 3438036 (1969-04-01), Bennett
patent: 4445118 (1984-04-01), Taylor et al.
patent: 4453165 (1984-06-01), Maine
patent: 4578678 (1986-03-01), Hurd
patent: 4622557 (1986-11-01), Westerfield
patent: 4644358 (1987-02-01), Sekine
Myers et al., The Radio Amateur's Handbook, 1973, p. 236.

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