Restricted by present manufacture techniques

the FOG gyro drift

scale factor and other parameters are changed with the time increasing.For this reason

there is need to re-calibrated gyro periodically.Laboratory calibration method relies on the high-precision three-axis turntable

which can not meet the field calibration requirements.Aiming at field calibration condition

the requirements for attitude reference must be reduced.To slove this problem

rotary error modulation mechanism is analyzed.The input angular rate variable is taken as the reference

by fully use rotating mechanism

a new six-position calibration method is presented for field calibration. Based on the self-made FOG

the experimental results show that this method and the traditional method are almost on the same accurate level

and also the present method reduce the calibration time and the dependence of calibration on turntable.