Global positioning system receiver

Details Global positioning system receiver Global positioning system receiver

1981-11-16

1984-06-26

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 97, 455264, 455316, H04L 2706

Patent

active

044570066

ABSTRACT:
In a Global Positioning System type of navigation system, a biphase modulated radio frequency input signal is applied to the "front end" of a double heterodyne receiver having a second intermediate frequency stage which operates in the audio frequency range. The audio output signal is phase locked to a 1 KHz reference signal and is applied to a microprocessor for processing via an interface circuit which includes a relatively simple amplitude detector and a novel biphase detector. The microprocessor also controls the phase shifting of a pseudorandom noise code generator whose output is modulated with the output of the first intermediate frequency stage of the receiver.

REFERENCES:
patent: 3311832 (1967-03-01), Schrader
patent: 3623098 (1971-11-01), Jones et al.
patent: 4198604 (1980-04-01), Holdaway

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