Anti-interference Backtracking Alignment Method for Positioning and Orientation System

In order to satisfy the requirements of rapidity and high accuracy in the initial alignment of a laser strapdown inertial navigation system, this paper proposes an anti-interference backtracking method. The method introduces a backtracking scheme for initial alignment, where the attitude matrix at the initial moment is obtained through a coarse alignment of the inertial system, and essential data are extracted and stored. Subsequently, the initial attitude matrix obtained from the coarse alignment and the stored data are utilized for backtracking Kalman filtering fine alignment. Experimental verification of the method demonstrates that the anti-interference backtracking method achieves higher accuracy in initial alignment compared to the conventional method within the same time frame. These results confirm the practicality and feasibility of the proposed alignment method