Abstract:

In some strapdown inertial navigation system(SINS) applications, by taking inertial frame as computing reference and with the aiding of an external velocity measuring equipment, the angular and linear moving disturbance can be easily eliminated to realize an in movement initial attitude and heading alignment. However, the alignment accuracy is subject to the displacement of SINS. The displacement of SINS is compensated to diminish the gravity deflexion error that expresses in inertial frame. Moreover, based on the inertial reference frame, a new SINS position determination method is deduced. The initial alignment accuracy is improved and a realtime position determination ability is reached by using the proposed method. Finally, some vehicular tests are carried out and the results show that the in movement heading alignment accuracy reaches 0.032°, and the positional accuracy is about 0.15% of the running distance.