Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1990-08-20
1993-02-09
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
H04B 7185, G01S 502
Patent
active
051856107
ABSTRACT:
A GPS single-receiver pointing/attitude system derives pointing/attitude measurements by correlating a selected GPS code (either P or C/A), recovered from GPS navigation signals using a single GPS receiver with multiple GPS antennas (a reference antenna and at least two slave antennas for pointing or three for attitude). For a two antenna pointing application, the GPS receiver (FIG. 4) includes, for each receiver channel, the incoming GPS signals are applied to three code correlators (72-75) assigned to the reference antenna, and three code correlators (76-77) assigned to the slave antenna, which provide corresponding reference and slave I and Q correlation outputs. The single-receiver pointing technique involves: (a) using the reference I and Q correlation outputs to establish a conventional reference antenna tracking loop; and (b) processing the reference and slave I and Q correlation outputs (using differential carrier doppler phase or code phase measurements) to determine phase differences from which pointing can be computed.
REFERENCES:
Proposal to Design, Fabricate, Test, and Deliver a Navstar Global Positioning System Azimuth Determining System, Texas Instruments Incorporated, Feb. 10, 1989.
Bossler and Goad, "Using the Global Positioning System (GPS) for Geodetic Positioning", Bulletin Geodesique, pp. 553-563, 1980.
Fell, "Geodetic Positioning Using a Global Positioning System of Satellites", Reports of the Department of Geodetic Science, Report No. 299, Ref. No. DMA PE63701B/3201/240, The Ohio State University Research Foundation, Ohio, Jun. 1980.
Remondi, "Using the Global Positioning System (GPS) Phase Observable for Relative Geodesy: Modeling, Processing and Results", Center for Space Research, The University of Texas at Austin, May, 1984.
Ashkenazi, Agrotis and Yau, "GPS Interferometric Phase Algorithms", Proceedings of the First International Symposium on Precise Positioning with the Global Positioning System--Positioning with GPS, 1985, vol. 1, pp. 299-313, Apr. 15-19, 1985, Rockville, Md.
Henson, Collier and Schneider, "Geodetic Applications of the Texas Instruments TI 4100 GPS Navigator", Proceedings of the First International Symposium on Precise Positioning with the Global Positioning System--vol. 1, pp. 191-200, Apr. 15-19, 1985, Rockville, Md.
Remondi, "Performing Centimeter`Level Survey Results in Seconds with GPS Carrier Phase: Initial Results", Proceedings of the Fourth Geodetic Symposium on Satellite Positioning, vol. 2, pp. 1229-1250, Apr. 28-May 2, 1986, Austin, Texas.
Rath, "Attitude Estimation Using GPS", Texas Instruments Incorporated, paper presented at the National Technical Meeting of the Institute of Navigation, San Mateo, California, Jan. 26, 1989.
Brown, "A GPS Receiver with Built-In Precision Pointing Capability", Texas Instruments Incorporated, paper presented at the IEEE Position Location and Navigation Symposium (Plans '90), Las Vegas, Nevada, Mar. 20, 1990.
Holmes Jerry D.
LaPadula Leonard J.
Scott H. Logan
Ward Phillip W.
Blum Theodore M.
Donaldson Richard L.
Grossman Rene E.
Texas Instruments Incorporated
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