Global positioning system receiver

Details Global positioning system receiver Global positioning system receiver

G - Physics

01

S

343/117

G01S 5/14 (2006.01) G01S 1/00 (2006.01)

Patent

CA 1199096

ABSTRACT OF THE INVENTION 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.

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