Fig. 1. Schematic of aperture stop matching. (a) Aperture stop is set in front of the light path; (b) aperture stop is set in middle of the light path

Fig. 2. Design basis of exit pupil aperture of baffle. (a) Derived model of lens; (b) exit pupil aperture of baffle

Fig. 3. Scattering of the part of light blocking ring facing the lens. (a) Scattering path of the part of light blocking ring facing the lens; (b) circular superposition at the phase of detector passing through the lens

Fig. 4. Relationship curves between ESSR and RPST at different entrance pupil apertures

Fig. 5. Schematic of envelope size of baffle

Fig. 6. Initial structure of baffle

Fig. 7. Diagram of light blocking rings at bevel angle and right angle. (a) Light blocking rings at bevel angle; (b) light blocking rings at right angle

Fig. 8. Diagram of single scattering at cutting edge

Fig. 9. Discrepancy of scattering energy of image plane caused by different edge thickness. (a) Edge scattering of test baffle 1; (b) edge scattering of test baffle 2; (c) image plane gray caused by edge scattering of test baffle 1; (d) image plane gray caused by edge scattering of test baffle 2

Fig. 10. Design diagram of secondary baffle

Fig. 11. Simulation results of edge thickness and stray illumination

Fig. 12. Stray light test data. (a) Stray light test site diagram; (b) gray level image of stray light on image plane of star sensor; (c) superposition of stray light gray-scale image and sixth-magnitude stars gray level image in different fields of view

Fig. 13. Test data of outfield. (a) Accuracy of star sensor without stray light; (b) accuracy of star sensor interfered by stray light using regular baffle; (c) accuracy of star sensor interfered by stray light using the proposed baffle