Autonomous Navigation Algorithm Using All-time Star Tracker, Accelerometer and Time

As a kind of high-precision attitude measurement instrument, star tracker will be widely used with the development of all-time technology. In order to expand the application scenario of star tracker, an autonomous navigation algorithm using all-time star tracker, time information, and accelerometer is proposed in this paper. Star tracker can measure the geometric relationship between carrier and inertial frame. Combined with accurate time and the measurement results of the accelerometer, the position and attitude of the carrier can be obtained through coordinate transformation. The error model of the navigation system is analyzed theoretically. The experimental results show that the accuracy of attitude measurement is about 10 ″, and the positioning accuracy is less than 10m while that of strapdown inertial navigation system is about dozens of meters.