Daryl C. Stjern - Thousand Oaks CA Thomas M. Wirt - Canoga Park CA
Assignee:
Sundstrand Corporation - Rockford IL
International Classification:
G01C 1964
US Classification:
356350
Abstract:
A low Q ring laser gyro-dither motor assembly which is responsive to a wide range of frequency components of a drive signal having a randomly varying frequency such that the dither imparted to the gyro is frequency modulated by the drive. The frequency modulated dither varies the lock-in rate of the gyro as a function of the random drive signal to eliminate errors in the gyro output due to lock-in. The drive signal may be random in frequency only or random in both frequency and amplitude to provide the frequency modulation. Fixed frequency modulation may also be employed. The low Q assembly need not be driven at the natural frequency thereof so that a common drive circuit may be employed for a plurality of low Q gyro-dither motor assemblies forming an instrument cluster.
Laser Gyro With Dithered Mirrors And Current Dither
Daryl C. Stjern - Thousand Oaks CA Frank Daly - Simi Valley CA
Assignee:
Sundstrand Optical Technologies, Inc. - Newbury CA
International Classification:
G01C 1964
US Classification:
356350
Abstract:
A laser gyro for detecting rates of rotating the gyro having a primary dither means for eliminating lock-in at low rates of rotation and a secondary dither means for eliminating nonlinearities in the gyro output when the input rate is a harmonic of the primary dither frequency. The gyro includes a body having a polygonal shaped cavity therein with a mirror disposed at each of the corners thereof to form a closed loop path for two counter-rotating beams. The primary dither includes means for dithering two mirrors 180. degree. out of phase to maintain the cavity path length constant. The secondary dither includes a current dither for differentially modulating the current in each leg of the gyro to randomly null nonlinearities in the gyro output.
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