An Outer Field Calibration Method of IMU Gyro Constant Drift

To solve the problem of inertial measuring unit(IMU) gyro constant drift in outer field calibration, a three-position outer field calibration method of IMU gyro constant drift is proposed. Under the static pedestal condition, the attitude angles of the product are measured by the secondary alignment technique, and then the north gyro drift is estimated by Kalman filter. Finally, the gyro drift is solved by the least squares method via combining the attitude angles of the three positions with the north gyro drift. Simulation results show that this method can estimate gyro constant drift effectively without using turntable.