High precision calibration method for three-cluster FOG

For three-cluster fiber optic gyro (FOG), calibration model was defined. The calibration error induced by earth rotation and interference among various parameters was analyzed theoretically. A high precision calibration method was presented, in which every parameter was tested separately, including bias, scale factor and misalignment. The calibration method was applied in a three-cluster FOG strapdown inertial navigation system (SINS), and the calibration result was given out. Error test for calibration result and SINS static test, dynamic test was carried out. The test results show that expected precision both of FOG and system performance have been achieved, the availability and utility of the calibration method are validated.