Method for in-field updating of the gyro thermal calibration of

Details Method for in-field updating of the gyro thermal calibration of Method for in-field updating of the gyro thermal calibration of

1994-07-27

1996-06-18

Kashnikow, Andres

Aeronautics and astronautics

Aircraft control

Automatic

244 76R, 244 79, 364453, B64C 1706, G05D 100, G01C 2100

Patent

active

055270034

ABSTRACT:
An in-field method for correcting the thermal bias error calibration of the gyros of a strapdown inertial navigation system. The method is begun after initial alignment while the aircraft remains parked with the inertial navigation system switched to navigation mode. Measurements are made of navigation system outputs and of gyro temperatures during this data collection period. A Kalman filter processes the navigation system outputs during this time to generate estimates of gyro bias error that are associated with the corresponding gyro temperature measurements. Heading error correcting is performed after the extended alignment data collection period as the aircraft taxis prior to takeoff. The gyro bias error-versus-temperature data acquired, along with the heading error corrections, are employed to recalibrate the existing thermal model of gyro bias error by means of an interpolation process that employs variance estimates as weighting factors.

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Article--John W. Diesel, "Calibration of a Ring Laser Gyro Inertial Navigation System for Minimum Velocity Error," Fourteenth Biennial Guidance Test Symposium, vol. II, Oct. 3-5, 1989 pp. 1-1 through 1-20.
Article--John Mark, Daniel Tazartes and Timothy Hilby, "Fast Orthogonal Calibration of a Ring Laser Strapdown System," Stuttgart, Germany (Sep. 1986).

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