Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1997-04-23
1998-07-14
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
701213, 375200, G01S 502, H04B 7185
Patent
active
057811563
ABSTRACT:
A GPS receiver in one embodiment includes an antenna which receives GPS signals at an RF frequency from in view satellites; a downconverter coupled to the antenna for reducing the RF frequency of the received GPS signals to an intermediate frequency (IF); a digitizer coupled to the downconverter and sampling the IF GPS signals at a predetermined rate to produce sampled IF GPS signals; a memory coupled to the digitizer storing the sampled IF GPS signals (a snapshot of GPS signals); and a digital signal processor (DSP) coupled to the memory and operating under stored instructions thereby performing Fast Fourier Transform (FFT) operations on the sampled IF GPS signals to provide pseudorange information. These operations typically also include preprocessing and post processing of the GPS signals. After a snapshot of data is taken, the receiver front end is powered down. The GPS receiver in one embodiment also includes other power management features and includes, in another embodiment the capability to correct for errors in its local oscillator which is used to sample the GPS signals. The calculation speed of pseudoranges, and sensitivity of operation, is enhanced by the transmission of the Doppler frequency shifts of in view satellites to the receiver from an external source, such as a basestation in one embodiment of the invention.
REFERENCES:
patent: 4445118 (1984-04-01), Taylor et al.
patent: 4457006 (1984-06-01), Maine
patent: 4601005 (1986-07-01), Kilvington
patent: 4701934 (1987-10-01), Jasper
patent: 4785463 (1988-11-01), Jane et al.
patent: 4797677 (1989-01-01), MacDoran et al.
patent: 4959656 (1990-09-01), Kumar
patent: 4998111 (1991-03-01), Ma et al.
patent: 5043736 (1991-08-01), Darnell et al.
patent: 5119102 (1992-06-01), Barnard
patent: 5153598 (1992-10-01), Alves, Jr.
patent: 5202829 (1993-04-01), Geier
patent: 5223844 (1993-06-01), Mansell et al.
patent: 5225842 (1993-07-01), Brown et al.
patent: 5245634 (1993-09-01), Averbuch
patent: 5271034 (1993-12-01), Abunza
patent: 5311194 (1994-05-01), Brown
patent: 5317323 (1994-05-01), Kennedy et al.
patent: 5323163 (1994-06-01), Maki
patent: 5323322 (1994-06-01), Mueller et al.
patent: 5365450 (1994-11-01), Schuchman et al.
patent: 5379047 (1995-01-01), Yokev et al.
patent: 5379224 (1995-01-01), Brown et al.
patent: 5379320 (1995-01-01), Fernades et al.
patent: 5416797 (1995-05-01), Gilhousen et al.
patent: 5420592 (1995-05-01), Johnson
patent: 5430759 (1995-07-01), Yokev et al.
patent: 5448773 (1995-09-01), McBurney et al.
patent: 5483549 (1996-01-01), Weinberg et al.
patent: 5491486 (1996-02-01), Welles, II et al.
PCT International Search Report sent Jul. 17, 1997.
PCT International Search Report sent May 13, 1997.
PCT International Search Report sent Mar. 10, 1997.
PCT International Search Report sent Feb. 21, 1997.
Davenport, Robert G. "FFT Processing of Direct Dequence Spreading Codes . . . " IEEE 1991 National Aerospace and Electronics Conference NAECON 1991, vol. 1, pp. 98-105, May (1991).
Rodgers, Arthur R. et al., "Animal-borne GPS: Tracking the Habitat" GPS World, pp. 21-22, Jul. 1994.
Raab, F.H. et al., "An Application of the Global Positioning System to Search and Rescue and Remote Tracking" Journal of Institute of Navigation, vol. 24, No. 3 pp. 216-227 (Fall 1977).
Peterson, Benjamin et al. "GPS Receiver Structures for the Urban Canyon" ION-GPS-95, Session C4, Land Vehicular Applications, Palm Springs, CA, Sep. 1995.
"Navstar GPS User Equipment, Introduction" NATO, Feb. 1991.
"Navigation Journal of the Institute of Navigation" Institute of Navigation, vol. 25, No. 2 Summer 1978. (entire edition).
"RTCM Recommended Standards for Differential Navstar GPS Service Version 2.0" RTCM Special Committee No. 104, Jan. 1, 1990.
Phan Dao L.
SnapTrack, Inc.
Tarcza Thomas H.
LandOfFree
GPS receiver and method for processing GPS signals does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with GPS receiver and method for processing GPS signals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and GPS receiver and method for processing GPS signals will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1886488