Fig. 1. Star imaging model. (a) A single wavelength imaging; (b) Chromatic aberration imaging

Fig. 2. The measurement model of star sensor

Fig. 3. The variation of focal length with spectral type

Fig. 4. Main point offset relative to initial value

Fig. 5. Relative variation of distortion coefficient relative to initial value

Fig. 6. Laboratory calibration system

Fig. 7. Turntable sampling points

Fig. 8. Focal length versus spectral type

Fig. 9. Main point versus spectral type

Fig. 10. Distortion coefficient versus spectral type

Fig. 11. Field experiment

Fig. 12. Root mean square error of angular distance measured in real star image