Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1993-04-09
1995-05-30
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
H04B 7185, G01S 502
Patent
active
054205930
ABSTRACT:
An embodiment of the present invention is a GPS receiver comprising a GPS downconverter, a fast acquisition unit, a GPS digital signal processor (DSP), a static random access memory (SRAM) and a temperature compensated crystal oscillator (TCXO). The fast acquisition unit samples intermediate frequency signals from the GPS downconverter at 5.17 MHz and writes the samples to the SRAM memory. The memory then supplies the samples back out at a rate of 10.34 MHz. The GPS DSP is such that PRN code and code phase searches are conducted at two times the real-time transmission rate of a GPS satellite. Once a code lock is obtained, Doppler, code, code phase and ephemeris data are stored by a GPS processor. If lock is lost, past code phase and Doppler are projected forward in time using ephemeris and other relevant GPS satellite knowledge to constrain a new search to re-establish lock.
REFERENCES:
patent: 4821294 (1989-04-01), Thomas, Jr.
patent: 4847862 (1989-07-01), Braisted et al.
patent: 5101416 (1992-03-01), Fenton et al.
patent: 5274667 (1993-12-01), Olmstead
Blum Theodore M.
Schatzel Thomas E.
Trimble Navigation Limited
LandOfFree
Method and apparatus for accelerating code correlation searches does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for accelerating code correlation searches , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for accelerating code correlation searches will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-365454