Aeronautics and astronautics – Aircraft control – Automatic
Patent
1994-05-23
1996-04-09
Kashnikow, Andres
Aeronautics and astronautics
Aircraft control
Automatic
244 76R, 244175, 244 79, 364447, 364453, G06G 778, G05D 100, B64C 1706
Patent
active
055054102
ABSTRACT:
A method and apparatus are provided for addressing the effect of centripetal acceleration upon estimates of cross-track velocity, for determination of east gyro bias error, generated with a taxiing aircraft. After initial estimates of crab angle, ratio of crab angle to centripetal acceleration and lever arm are provided, velocity, heading angle and heading angle rate are observed as the aircraft taxis. An estimated value of centripetal acceleration is taken as the product of heading angle rate and heading velocity. Cross-track velocity is computed from cross-heading velocity and this is integrated to generate cross-track position. A Kalman filter generates various gains, including one associated with the ratio of crab angle to centripetal acceleration, for error allocation. The product of the Kalman gain pertaining to crab angle ratio and the computed cross-track position provides a crab angle ratio error that is integrated and multiplied by the estimated centripetal acceleration to provide an optimum estimate of the portion of crab angle that is associated with centripetal acceleration.
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Publication: John W. Diesel, "Calibration of a Ring Laser Gyro Inertial Navigation System For Minimum Velocity Error," Fourteen Biennial Guidance Test Symposium, Central inertial Guidance Test Facility Guidance Test Division, 6585th Test Group, Holloman AFB, vol. II (Oct. 3-5, 1989), pp. 1--1 through 1-20.
Diesel John W.
Dunn Gregory P.
Kashnikow Andres
Kramsky Elliott N.
Litton Systems Inc.
Mojica Virna Lissi
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