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.
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