Fig. 1. Diagram of seeker model

Fig. 2. Seeker mesh model and its flow field grid model. (a) Mesh model; (b) flow field grid model

Fig. 3. Temperature map of seeker at different altitudes after flying for 10 s. (a) 2 km; (b) 11 km; (c) 20 km

Fig. 4. Maximum temperature of optical window varying with time of flight

Fig. 5. Simulation diagrams of detector irradiance for 10 s flight of seeker. (a) 2 km altitude detector irradiance map; (b) 11 km detector irradiance map; (c) 20 km detector irradiance map

Fig. 6. Change trend of maximum irradiance of detector's receiving surface within 10 s of seeker's flight

Fig. 7. Distorted images of simulation target

Fig. 8. Variation of signal-to-noise ratio with flight time

Fig. 9. Variation of signal-to-noise ratio with detection distance