Star Map Processing Technology Research Of APS Star Sensor

According to the problem that the accuracy of star sensor isn't high in China,the paper study the complex background noise,low accuracy centroid extraction and cumbersome star match appeared in the process of star sensor fixed position use the star map download by ZY-3 APS,use star diagonal distance between navigation star and observation star as an experimental condition.compare the accuracy of different condition such as before and after eliminating noise,different window size and avery centroid extraction method.puts forward a short-term dynamic background noise eliminating method to eliminate the system error and puts forward An energy symmetry method to extract the subpixel of star,also studied the tracking matching technology and process.The experimental results show that the short-term dynamic background noise eliminating method can improve the accuracy of subpixel extraction effectively,especially the method of quality extraction,the standard deviation of star diagonal distance error improved 9.34 "for the method of gray weighted a moment(3×3),and gray weighted second moment method(3x3)improved 6.55".The accuracy of energy symmetric method is higher than the traditional gray weighted method,quite with Gaussian segmentation method and Gaussian grid method This method has characteristics of strong resistance noise and high precision.The study of tracking matching greatly reduces stars match search range and reduces the match time,increases the probability of a match.