Abstract: An integrated navigation system of GPS/SST/SINS is presented in this paper.This system uses an improved centralized Kalman filter to perform data fusion between the multi-sensor outputs and estimate the optimal navigation result.In this system the attitude of the strap down star tracker (SST), the position and velocity of GPS, and the correspondence information of SINS are filtered to improve navigation precision of attitude, velocity and position.The system is then used in a ballistic missile model to implement a simulated platform of GPS/SST/SINS integrated navigation. The result shows that the system can effectively enhance navigation precision and the filter is stable and reliable.

Key words: strapdown star tracker, integrated navigation, ballistic missile, filtering algorithm, location system