title: Attitude-correlated frames approach for a star sensor to improve attitude accuracy under highly dynamic conditions.
abstract: The attitude accuracy of a star sensor decreases rapidly when star images become motion-blurred under dynamic conditions. Existing techniques concentrate on a single frame of star images to solve this problem and improvements are obtained to a certain extent. An attitude-correlated frames (ACF) approach, which concentrates on the features of the attitude transforms of the adjacent star image frames, is proposed to improve upon the existing techniques. The attitude transforms between different star image frames are measured by the strap-down gyro unit precisely. With the ACF method, a much larger star image frame is obtained through the combination of adjacent frames. As a result, the degradation of attitude accuracy caused by motion-blurring are compensated for. The improvement of the attitude accuracy is approximately proportional to the square root of the number of correlated star image frames. Simulations and experimental results indicate that the ACF approach is effective in removing random noises and improving the attitude determination accuracy of the star sensor under highly dynamic conditions.
authors.forename: Liheng
authors.initials: L
authors.lastname: Ma
authors.forename: Dejun
authors.initials: D
authors.lastname: Zhan
authors.forename: Guangwen
authors.initials: G
authors.lastname: Jiang
authors.forename: Sihua
authors.initials: S
authors.lastname: Fu
authors.forename: Hui
authors.initials: H
authors.lastname: Jia
authors.forename: Xingshu
authors.initials: X
authors.lastname: Wang
authors.forename: Zongsheng
authors.initials: Z
authors.lastname: Huang
authors.forename: Jiaxing
authors.initials: J
authors.lastname: Zheng
authors.forename: Feng
authors.initials: F
authors.lastname: Hu
authors.forename: Wei
authors.initials: W
authors.lastname: Wu
authors.forename: Shiqiao
authors.initials: S
authors.lastname: Qin