A Study on the Alignment of Platform INS Based on the Rotation Around Azimuth Axis

Abstract

Platform INS is a type of high-precision navigation equipment and widely used in launch vehicles, missiles, aircrafts, ships and other types of carrier. The traditional gyrocompass alignment method used for the platform INS on stationary base is affected by the gyro’s random drift, installation error and the scale factor errors and gimbal locking errors. This paper presents a new gyrocompass alignment method based on the continuous rotation around the platform’s azimuth axis. Through locking the horizontal gimbal control loop and rotating around the azimuth axis, the alignment is carried out by estimating the misalignments based on horizontal gyros torque currents information. Simulation results show that the initial alignment can be quickly carried out with high precision and the proposed method has more advantages than traditional gyrocompass alignment method.