Fig. 1. Schematic diagram of limb viewing

Fig. 2. Optical system of Doppler asymmetric spatial heterodyne interferometer

Fig. 3. Atmospheric background radiation intensity and airglow intensity

Fig. 4. Atmospheric background radiation reaching the entrance pupil

Fig. 5. Design principle of the baffle

Fig. 6. Baffle geometry

Fig. 7. 3D model of Doppler asymmetric spatial heterodyne interferometer

Fig. 8. Stray light caused by the key surfaces

Fig. 9. Detector shell

Fig. 10. Multistage diffraction of grating

Fig. 11. Diffraction light of the Doppler asymmetric spatial heterodyne interferometer on axis field

Fig. 12. Simulated irradiance map of sensor on axis field

Fig. 13. Reference frame of the Doppler asymmetric spatial heterodyne interferometer

Fig. 14. PST curves of the Doppler asymmetric spatial heterodyne interferometer

Fig. 15. Division of observation area

Fig. 16. Solid angle of CD for O

Fig. 17. Simulated irradiance map of sensor