Machine element or mechanism – Gyroscopes – Gyroscope control
Patent
1981-03-27
1984-06-05
Bonck, Rodney H.
Machine element or mechanism
Gyroscopes
Gyroscope control
74 56E, G01C 1930
Patent
active
044520921
ABSTRACT:
In a gyroscopic reference system of the type having force rebalanced or flexure suspended gyroscope rate sensors and pulse width modulated torquer signals, undesirable transformer like coupling between the torquer coils and the pick-off coils and transformer like coupling between the torquer coils themselves causes a bias drift error. The transformer coupling and the bias drift error are alleviated or substantially eliminated by selecting the pick-off excitation frequency to be a non-integer multiple of the torquer coil frequency and by delaying the trailing edges of the pulses of the pulse width modulated torquer signals.
REFERENCES:
patent: 3242745 (1966-03-01), Romberg
patent: 3477298 (1969-11-01), Howe
patent: 4189948 (1980-02-01), Buckley et al.
patent: 4212443 (1980-07-01), Duncan et al.
patent: 4222270 (1980-09-01), Allen
Bonck Rodney H.
Sperry Corporation
Terry Howard P.
LandOfFree
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