Yuanman NI, Dongkai DAI, Xingshu WANG, Zhaofa ZHOU. Optical parameter optimization of star sensor for daytime star detection at different altitudes[J]. Infrared and Laser Engineering, 2024, 53(7): 20240056
- Infrared and Laser Engineering
- Vol. 53, Issue 7, 20240056 (2024)
Fig. 1. (a) Sky background radiation simulation results at noon for urban summer with different detector directions; (b) Atmospheric transmittance simulation results at noon for urban summer with different detector directions when the visibility is 5 km
Fig. 2. Detectable star magnitude limit changes with focal length and diameter at sea level
Fig. 3. Cutoff wavelength optimization at sea level
Fig. 4. Detection capability estimation at sea level
Fig. 5. Average number of navigation stars in FOV (field of view) at sea level
Fig. 6. (a) Average number of navigation stars in FOV with fixed diameter of 200 mm and changing focal length; (b) Average number of navigation stars in FOV with optimal focal length at different altitudes
Fig. 7. Average number of navigation stars in FOV changes with focal length and diameter at 20 km
Fig. 8. Cutoff wavelength optimization at an altitude of 20 km
Fig. 9. Experimental system of star sensor with tracking mode
Fig. 10. (a) Infrared star image taken at daytime after non-uniformity calibration (magnitude –1.608, 9:45 a.m.); (b) Gray values of the boxed star area
Fig. 11. Signal to noise ratio of star images for different magnitudes
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Table 1. Parameters of typical SWIR detector
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Table 2. Optical parameters of the experimental system
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Table 3. Information of observed stars during daytime
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