RING LASER GYROSCOPE SCALE FACTOR ERROR CONTROL APPARATUS AND METHOD
Assignee
LITTON SYSTEMS, INC., A CORP. OF DE.
Filed
Oct 28, 1987
Granted
Aug 15, 1995
Location
PACIFIC PALISAD CA US
Abstract
The intensity and frequency variation due to retroscatter in a ring laser gyroscope are determined and used to correct the gyro scale factor. The orthogonal types of scatter due to dielectric variation and due to height variation, which lead to common mode phase delays of 0 and π/2 respectively are taken into account in calculating the correction to the scale factor. The scale factor errors are determined in terms of observable quantities. Scale factor error control is accomplished by extracting a portion of both of the two counterpropagating light beams and measuring their respective intensities, creating intensity modulation indices representative of the sum and difference intensities, using closed loop control of the real-time difference between the intensities of the beam in the ring laser gyro to reduce scale factor variation using push-pull mirror control of at least two mirrors. The residual error after push-pull mirror control minimization is output for use by a navigation system computer.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
May 17, 1988
Rescinded
May 23, 1994
Duration
6 years
Inventor
- 1EDWARD KANEGSBERG
Technology Domains
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Record Details
- Patent number
- US 5442442
- Application
- 07114481
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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