Fig. 1. Star deviation calibration model

Fig. 2. (a) Grabbing image; (b) Extraction of measured star centroid

Fig. 3. Extraction of measured star centroid coordinates

Fig. 4. Flow chart of calibration star data conversation

Fig. 5. Schematic diagram of star pattern matching algorithm for deviation calibration

Fig. 6. Flow chart of star pattern matching algorithm for deviation calibration

Fig. 7. (a) Captured image by first frame; (b) Star pattern matching by first frame; (c) Pointing fitting of photocenter direction by first frame

Fig. 8. (a) Captured image by last frame; (b) Star pattern matching by last frame; (c) Pointing fitting of photocenter direction by last frame

Fig. 9. Distribution of pointing residue without corrected

Fig. 10. Distribution of pointing residue after corrected

Fig. 11. (a) Star pattern matching by pointing at Polaris; (b) Pointing fitting of photocenter direction by pointing at Polaris