Rapid and Accurate Regional Star-Map Simulated Method

In Celestial Navigation System, star-sensor completes attitude determination of carrier via using stars in starry skies. Star-sensor usually adopts simulated star-map instead of field observation in situations of test and simulation due to the limitations of uncontrollable factors involved by observation condition and environment. To cooperate with performance tests and function verifications of star-sensor to judge the accuracy of matching and recognition, regional simulated starmap needs to be generated timely and precisely. The quality of imaging is decided by the accuracy of centroid position and magnitude grayscale of each single star-spot, and the rapidness of refreshing is decided by the speed of star extraction. In order to improve the precision and realtime, sub-pixel star-spot reconstruction method, wide grayscale distribution method and rapid regional star-map generation method are proposed to generate simulated regional star-map rapidly. In the situation of ensuring the star magnitude being consistent with ephemeris, the centroid accuracy of star-spots achieve the level of 1% pixel.