A Study Of The Star Recognition Algorithm And Its Application Based On CCD

This article aim at improve the precision of strap-down astronomical attitude measure system. On the base of the hardware system, Adopted the method of theory analysis and the experimentation, this article researched the CCD pretreatment, confusion of voices eliminate, star segmentation, star coordinate pick-up, system demarcate, Atmospheric refraction correct, navigation constellation precision evaluation and navigation constellation select. And studied the local sky star identification application.CCD pretreatment used the method of the dark field and the flat field, removed the un-equality of the CCD. In the same time, this article adopted area segmentation to removed confusion of voices, and this method removed the confusion of voices effectively.According to attitude measurement system using conditions and working environment, it adopts cross projection method to segmentation of astrology. And this method is simple and fast calculation speed, can meet the requirements of data rate. The astrological centroid extraction, this paper adopts the method of locating the center of gravity to obtain astrological centroid, locating the center of gravity method for the computation of only four operations, the amount of calculation is much smaller than the Gauss fitting, when dealing with large amounts of astrology is extremely simple. At the same time, avoiding the star simulation software error was introduced, improves the calibration precision.