Vibration gyro having bias correcting function, and method of using vibration gyro

摘要

A vibration gyro having high bias stability, and a method of using the gyro for obtaining a precise angular velocity signal by correcting the parallel bias. The gyro has: a drive signal generating part 58 configured to generate a multiplexed drive signal; first and second demodulation circuits 64, 66 configured to generate first and second demodulation signals, respectively; first and second control circuits 68, 70 configured to generate first and second feedback amplitude signals, respectively; a feedback signal generating part 90 configured to generate a first multiplexed feedback signal by multiplexing a first feedback signal obtained by modulating the first feedback amplitude signal at the first frequency, and at least one second feedback signal obtained by modulating the second feedback amplitude signal at frequency; and a subtracter 78 configured to output an angular velocity signal by subtracting the second feedback amplitude signal from the first feedback amplitude signal.