Initial Alignment Method of Strapdown Inertial Navigation System for Shipbased Weapons

The swaying movement and the lever arm effect erro r are two major factors affecting the alignment accuracy of shipbased weapons. Based on the characteristics of shipbased weapons, an error model of strapdown inertial navigation system(SINS) is established on a swaying base, and an autonomous initial alignment method of shipbased weapons is analyzed in details. On the basis of the conventional compensation method of the lever arm effect error, a new method for compensating this error is proposed. The simulation results show that the new method has higher precision than that of the conventional one. This investigation would be expected to offer atheoretical foundation to the design and selection of alignment scheme for SINS of shipbased weapons.