Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1997-02-01
1998-05-26
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
3644499, G01S 507, G01C 2100
Patent
active
057573166
ABSTRACT:
The invention is a method for obtaining observables for input to a Kalman filter process which determines the attitude (roll, pitch, and heading) of a platform. The invention utilizes an inertial measurement unit (IMU) attached to the platform and an associated processor, a plurality of signal receiving antennas attached to the platform, and a plurality of satellite transmitters. The heading of the platform as determined by the IMU and its associated processor by themselves can be significantly in error. A comparison of the values of an attitude-sensitive function of the ranges from the platform antennas to different groupings of satellite transmitters obtained first by using IMU data and second by using the measured phases of the satellite-transmitter signals received at the platform antennas, a very accurate value for the range function is obtained. This accurate value of the range function is used in a Kalman filter process to obtain very accurate values for platform attitude.
REFERENCES:
patent: 4754280 (1988-06-01), Brown et al.
patent: 5296861 (1994-03-01), Knight
patent: 5416712 (1995-05-01), Geier et al.
patent: 5543804 (1996-08-01), Buchler et al.
patent: 5617317 (1997-04-01), Ignagni
Issing Gregory C.
Litton Systems Inc.
Malm Robert E.
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