Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1996-03-29
1998-10-27
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
701214, H04B 7185, G01S 502
Patent
active
058283366
ABSTRACT:
The present invention provides a method and a device for providing superior differential GPS positioning data. The system includes a group of GPS receiving ground stations covering a wide area of the Earth's surface. Unlike other differential GPS systems wherein the known position of each ground station is used to geometrically compute an ephemeris for each GPS satellite, the present system utilizes real-time computation of satellite orbits based on GPS data received from fixed ground stations through a Kalman-type filter/smoother whose output adjusts a real-time orbital model. The orbital model produces and outputs orbital corrections allowing satellite ephemerides to be known with considerable greater accuracy than from the GPS system broadcasts. The modeled orbits are propagated ahead in time and differenced with actual pseudorange data to compute clock offsets at rapid intervals to compensate for SA clock dither. The orbital and clock calculations are based on dual frequency GPS data which allow computation of estimated signal delay at each ionospheric point. These delay data are used in real-time to construct and update an ionospheric shell map of total electron content which is output as part of the orbital correction data, thereby allowing single frequency users to estimate ionospheric delay with an accuracy approaching that of dual frequency users.
REFERENCES:
patent: 4894662 (1990-01-01), Counselman
patent: 5323322 (1994-06-01), Mueller et al.
patent: 5590043 (1996-12-01), McBurney
patent: 5596328 (1997-01-01), Stangeland
Bertiger William I.
Lichten Stephen M.
Mannucci Anthony J.
Muellerschoen Ronald J.
Wu Sien-Chong
Blum Theodore M.
Kusmiss John H.
The United States of America as represented by the Administrator
LandOfFree
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