Fig. 1. Schematic diagram of the two-mirror reflection system

Fig. 2. Point array diagram of the catadioptric afocal system after the addition of the near-axis surface

Fig. 3. Distortion of the afocal system after adding the near-axis surface

Fig. 4. Catadioptric afocal system

Fig. 5. Composite axial system

Fig. 6. Point array diagram of the imaging light path in a compound axis system

Fig. 7. MTF of the imaging light path in a compound axis system

Fig. 8. Relationship between image shift on detector and time

Fig. 9. Impact of image shift on MTF

Fig. 10. Schematic diagram of fast-steering mirror compensation for image shift

Fig. 11. The relationship between compensated image shift on the detector and time

Fig. 12. MTF with fast steering mirror compensation

Fig. 13. Schematic diagram of image rotation

Fig. 14. MTF along image shift direction at various positions on the field edge of the detector with different rear group focal lengths

Fig. 15. MTF at different image formation focal lengths of the rear group

Fig. 16. MTF affected by image rotation