Subdivided locating method of star image for star sensor

The basic principle of star sensor and major preprocessing methods of star image were introduced. The traditional centroid method, threshold centroid method, squared centroid method and Gauss curve fitting method were applied to star locating of star image for star sensor. The simulation results show that threshold centroid method is most appropriate for star locating. The influences of noise level, filter processing and threshold choosing on the precision of star locating were simulated. The star locating of the actual star image can be done by threshold centroid method.