Pulse or digital communications – Repeaters – Testing
Patent
1987-07-08
1989-04-11
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
342352, 375 1, 375 97, H04B 701
Patent
active
048212946
ABSTRACT:
A digital signal processor and processing method therefor for use in receivers of the NAVSTAR/GLOBAL POSITIONING SYSTEM (GPS) employs a digital carrier down-converter, digital code correlator and digital tracking processor. The digital carrier down-converter and code correlator consists of an all-digital, minimum bit implementation that utilizes digital chip and phase advancers, providing exceptional control and accuracy in feedback phase and in feedback delay. Roundoff and commensurability errors can be reduced to extremely small values (e.g., less than 100 nanochips and 100 nanocycles roundoff errors and 0.1 millichip and 1 millicycle commensurability errors). The digital tracking processor bases the fast feedback for phase and for group delay in the C/A, P.sub.1, and P.sub.2 channels on the L.sub.1 C/A carrier phase thereby maintaining lock at lower signal-to-noise ratios, reducing errors in feedback delays, reducing the frequency of cycle slips and in some cases obviating the need for quadrature processing in the P channels. Simple and reliable methods are employed for data bit synchronization, data bit removal and cycle counting. Improved precision in averaged output delay values is provided by carrier-aided data-compression techniques. The signal processor employs purely digital operations in the sense that exactly the same carrier phase and group delay measurements are obtained, to the last decimal place, every time the same sampled data (i.e., exactly the same bits) are processed.
REFERENCES:
patent: 4112372 (1978-09-01), Holmes et al.
patent: 4361891 (1980-11-01), Lobenstein et al.
patent: 4494238 (1985-01-01), Groth, Jr.
patent: 4530103 (1985-07-01), Mosley, Jr. et al.
patent: 4633426 (1986-12-01), Venier
patent: 4701934 (1987-10-01), Jasper
California Institute of Technology
Safourek Benedict V.
Tachner Leonard
LandOfFree
Digital signal processor and processing method for GPS receivers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital signal processor and processing method for GPS receivers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital signal processor and processing method for GPS receivers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-672164