Fast Alignment Method for Strapdown Navigation System on Stationary Base
Xu Bo, Duan Tenghui, Wang Lianzhao, Harbin Engineering University, China
Location: Big Sur
The accuracy and convergence speed in alignment of strap-down inertial navigation system(SINS) are the two contradictory indexes. The paper mainly lays emphasis on the alignment speed instead of high precision. It requires high rapidity more than high accuracy due to some specific occasions such as the launching of artillery or torpedo. In this case, it is very necessary to converge in a very short time. However, the traditional Kalman filter method uses speed or position as measurement, and it takes a long time to complete the initial alignment. Aiming at this problem, a fast alignment method based on the information of gyroscope on static base is proposed. On basis of the traditional method, gyro output is used as an auxiliary measurement to improve the alignment speed. The simulation result demonstrates that the proposed method has a good effect on fast convergence.