Electronic dither compensator for a ring laser gyro
AssigneeThe Singer Company
InventorLincoln S. Ferriss
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Abstract
An electronic dither compensator for a ring laser gyroscope uses a velocity pickoff to eliminate the need for a differentiator following a displacement pick off in order to get a rate signal. The dither pickoff is converted, in a voltage to frequency converter, to a pulse train which is synchronized with the pulse train of the uncompensated input from the gyro detector. An automatic gain control with an amplitude control loop is provided. The pulses from the voltage-to-frequency converter and uncompensated inputs are synchronized and summed and differenced as selected by means of logic to produce gyro output pulses free from the effects of dither rate.
Claims20
In a dithered ring laser gyroscope having an uncompensated output indicative of rotation rate, the improvement comprising:
- (a) a velocity pickup for sensing dither;
- (b) an electronic dither compensator comprising:
- (i) an automatic gain control element receiving as an input the output of the dither pickoff and providing an output;
- (ii) a voltage-to-frequency converter having its input coupled to the output of said automatic gain control element providing an output pulse train proportional to dither rate;
- and
- (c) means to combine the output of said voltage-to-frequency converter with the uncompensated input from the gyro to remove the effect of dither on said uncompensated output.
Dependencies are inferred from the claim text.