Effect of gyroscope's error on attitude-correlated frames approach for a star sensor

A star sensor is one of the most promising devices that determines attitude with the accuracy of sub-arcsecond. However, the attitude accuracy of the star sensor degrades rapidly under dynamic conditions. Therefore, the attitude-correlated frames (ACF) approach is presented to solve this problem. Gyro error is one of the main errors in ACF approach and is comprehensively discussed in this paper. Herein, the discussion about the influence of gyro error in ACF approach is divided into two parts: the impact of gyro noise and that of gyro bias. Through the simulations, the best number of correlated frames can be found to help improve the accuracy of ACF more efficient. After that, examples are given to verify the results of simulations.