Digital spread spectrum GPS navigation receiver

Details Digital spread spectrum GPS navigation receiver Digital spread spectrum GPS navigation receiver

1996-07-17

1999-08-24

Le, Amanda

Pulse or digital communications

Repeaters

Testing

375208, 370320, 370335, 370342, 370479, 342464, 710213, H04K 100

Patent

active

059433639

ABSTRACT:
Disclosed are digital processing techniques for efficiently receiving, sampling and recovering multiple direct-sequence spread-spectrum signals by multiplexing key signal processing elements across many logical channels. Global Positioning System (GPS) receivers serve to illustrate the technique. They receive many signals, each with independent timing, phase, amplitude, and data modulation, which may arrive on multiple carrier frequencies and at multiple spreading rates. To employ digital processing techniques, the carrier or carriers are reduced to one or more digital sample streams. Digital processing (e.g., products, sums, decisions, etc.) is then used to estimate, or recover, the received signal and its characteristics. When these functions can be partitioned by processing rate, the usual case, the lower-rate functions can be efficiently shared with negligible efficiency loss.

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patent: 5654979 (1997-08-01), Levin et al.
patent: 5764687 (1998-06-01), Easton

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