Litton Systems, Inc.

Northrop Grumman Systems Corporation

George H McCammon

Robert D Curby

Alexander A Trusov

Jeff Becker

Mark R Phillips

Tim Richmond

One embodiment describes an inertial system. The system includes a gyroscope system comprising a plurality of gyroscopes. The gyroscope system can be configured to provide rotation rate data associated with rotation of the plurality of gyroscopes about a respective plurality of sensitive axes. The system also includes a rotation sensor system configured to calculate navigation data based on the rotation rate data. The rotation sensor system includes a self-calibration component configured to designate a first gyroscope of the plurality of gyroscopes for self-calibration during operation of the inertial system and to inject a calibration input signal into the first gyroscope. The self-calibration component being configured to calibrate the first gyroscope based on the rotation rate data of the first gyroscope corresponding to the calibration input signal relative to the rotation rate data associated with a remaining at least one of the plurality of gyroscopes.

Self-calibration of an inertial system

Spurious pulses are eliminated in the output of a comparator performing analog to digital conversion by addition of logic which eliminates pulses having a width less than a selected width from the output of the comparator.

Comparator digital noise filter

Apparatus and method for dithering ring laser angular rotation sensors, including a plurality of such sensors with substantially identical natural dither frequencies and having different sensor axes mounted upon a resilient structure; applying energy to dither such sensors; the energy being connected and disconnected from the dithering of each sensor in response to the amplitude of dither of that particular sensor to minimize lock-in; and frequency or phase modulating the energy applied to dithering to avoid continued uni-directional coning effects.

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Moorpark, CA, United States of America

George H McCammon