Method for increasing data updating rate of star sensor

The invention discloses a method for increasing the data updating rate of a star sensor. The method comprises steps as follows: firstly, after the star sensor predicts the next-frame tracking window image surface position, according to window sizes and read data size limitations, an optimal exposure and read line is further determined, and line information is output; when a logic device of the star sensor controls exposure and reading of a sensitive chip, corresponding line image data are exposed and read only according to information input, and the data are stored according to windows; when software and the logic device of the star sensor perform line information and image data interaction, information correspondence is realized with a loop index method. According to the method, strict data correspondence of a three-stage assembly line of image exposure, image data storage and software computation is guaranteed with the loop index method.