A Method of Star Extraction Using on Star Sensors

The composition and basic principle are introduced.The methods of the threshold,connectivity analysis and the rectangle centroid for the star locating of the star-image are adopted on the basis of the hardware platform constituted by the DSP and CPLD in order to obtain the coordinates of stars.An improved connectivity analysis algorithm is introduced.Compared with traditional connectivity analysis algorithm,it saves the time of processing of star-image,and also improves the accuracy of star locating.Finally,the star sensor has used this method to do experimental verification and satisfied results are obtained.