Method and apparatus for maintaining the integrity of spacecraft

Details Method and apparatus for maintaining the integrity of spacecraft Method and apparatus for maintaining the integrity of spacecraft

2000-01-28

2000-10-17

Cuchlinski, Jr., William A

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Aeronautical vehicle

701 3, 701213, 701214, 701215, 34235706, 34235712, 34235715, 73178R, 455 8, 455 121, G01S 502, H04B 7185

Patent

active

061344842

ABSTRACT:
A method and apparatus for maintaining the integrity of spacecraft based time and position using GPS (11) is disclosed. A GPS receiver is provided with a Receiver Autonomous Integrity Monitor (RAIM) processor (12) and a Kalman filter (14). GPS signals are received from at least four GPS satellites and processed in the GPS receiver to provide time and position information. Periodically, an extended fault vector is formed in the Kalman filter with propagated open-loop position and velocity measurements. The extended fault vector is used to isolate and remove failing GPS satellites.

REFERENCES:
patent: 5583744 (1996-12-01), Diesel
patent: 5825326 (1998-10-01), Semler et al.
patent: 5923286 (1999-07-01), Divakaruni
An article entitled "A Baseline GPS RAIM Scheme And a Note on the Equivalence of Three RAIM Methods", by R. Grover Brown, Iowa State University, Ames, Iowa, 1992 from the Navigation: Journal of The institute of Navigation.

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