Abstract: In this paper, an analysis of abnormal work mechanism for star trackers while passing through the south atlantic anomaly (SAA) space zone is put forward. And, based on the correlated simulating model, two algorithms of resisting highenergy particle radiation interference are both proposed, namely, real stars detection and alignment between frames. The simulation shows that for star trackers with improved algorithms, the computational cost time and the successful identification rate are greatly higher than those with normal algorithms in capture mode and in track mode, being competent with relatively severe space radiation environment.

Key words: star tracker, space radiation environment, transient effect