APPARATUS AND METHOD FOR CORRECTING RING LASER GYROSCOPE PHASE ANGLE ERRORS INDUCED BY LOCK-IN
Assignee
Litton Systems
Filed as: LITTON SYSTEMS, INC.
Filed
Oct 19, 1987
Granted
Sep 13, 1994
Location
CANOGA PARK CA US
Abstract
Phase errors that occur when a dithered ring laser gyroscope enters its deadband are measured, and a correction is applied to the output of the ring laser gyroscope to compensate for these phase errors. The counterpropagating beams in a ring laser gyroscope are heterodyned to produce a pair of quadrature heterodyne signals that indicate the angular output of the laser ring laser gyroscope. The phase angle error between one of the heterodyne signals and either the sum or difference of the separate beam intensities is determined, The phase angle error signal is used to produce a control signal for adjusting the output of the ring laser gyroscope to correct for errors introduced at or near turnarounds in the dither cycle.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
May 17, 1988
Rescinded
Jan 26, 1994
Duration
5 years, 8 months
Inventor
- 1THOMAS J. HUTCHINGS
Technology Domains
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Record Details
- Patent number
- US 5347359
- Application
- 07110003
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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