Multi-channel digital receiver for global positioning system

Details Multi-channel digital receiver for global positioning system Multi-channel digital receiver for global positioning system

1990-11-28

1992-03-31

Tarcza, Thomas H.

Pulse or digital communications

Repeaters

Testing

342357, H04B 1500

Patent

active

051014165

ABSTRACT:
A receiver for pseudorandom noise (PRN) encoded signals consisting of a sampling circuit and multiple channel circuits, with each channel circuit including a carrier and code synchronizing circuit and multiple digital correlators with dynamically adjustable code delay spacing. The sampling circuit provides high-rate digital samples of the incoming composite signal to each receiver channel. Within each channel, the synchronizing circuit detects cycle slips in a locally generated carrier reference signal as well as phase drift in a locally generated PRN code signal. The correlators compare the digital samples with a locally generated PRN code to produce early, late, and/or punctual correlation signals which are used to adjust the local PRN code. A non-linear sampling technique may be used to provide increased sensitivity in the presence of continuous wave interfering signals.

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Langley, R. B., "Why is the GPS So Complex?", GPS World, May/Jun. 1990, pp. 56-59.

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