Fig. 1. Radiation energy exchange between aircraft and space environment

Fig. 2. Geometric position relationship between target surface and pupil surface of detector

Fig. 3. Partial drawing of aircraft (Unit: mm)^[19]

Fig. 4. Comparison between the calculated temperature and the measured temperature of the flight test measuring point position

Fig. 5. Relative deviation of comparison between calculated temperature and measured temperature of flight test measuring point position

Fig. 6. Assumes the geometric shape of aircraft (Unit: mm)

Fig. 7. Variation temperature of the typical position with time of flight under aerodynamic heating and sunlight

Fig. 8. Variation temperature of the typical position with time of flight under sunlight without considering aerodynamic heating

Fig. 9. The radiation intensity of 3-5 μm band changes with flight time

Fig. 10. The radiation intensity of 8-12 μm band changes with time of flight

Fig. 11. Comparison of the variation of radiation intensity at 3-5 μm and 8-12 μm bands with time of flight