Fig. 1. Diagram of star sensor in stray light

Fig. 2. Process of extracting star spot based on stray light background estimation

Fig. 3. An example of a constructed filter matrix

Fig. 4. Determine the optimal surface of stray light. (a) One of the estimated surfaces; (b) The optimal surface

Fig. 5. The process of calculating the centroid of a star spot

Fig. 6. Star images with different stray light. (a) Star image with the simulated stray light; (b) Star sensor image under the condition of moonlight; (c) Star sensor image under the condition of an artificial light

Fig. 7. Star spots detection rate

Fig. 8. Star spots false detection rate

Fig. 9. Centroid error of star spots extracted