Fig. 1. Spectral characteristic of limb radiation. (a) Spectral characteristic of limb radiation of O3 molecule; (b) enlarged image at the box in Fig. 1(a)

Fig. 2. Principle of wind measurement based on interferometer. (a) Doppler frequency shift of target spectral line; (b) phase shift of interference image

Fig. 3. Schematic of SWIFT optical system

Fig. 4. Bandpass filter function of Fabry-Perot etalon. (a) Narrowband etalon; (b) mid-band etalon; (c) wideband etalon

Fig. 5. Spectral line separation. (a) Radiation lines of O3 molecule; (b) total filter function; (c) radiation line after filtering separation (internal graph expressed in logarithmic coordinate)

Fig. 6. Transmittance of filtering system. (a) Transmittance of target spectral line 1133.4335 cm-1 after filtering through CCD field of view 1; (b) transmittance of lines Nos. 20, 40, and 60 in Fig. 6(a)

Fig. 7. Optical path difference distribution of off-axis incident signal

Fig. 8. Phase distribution of Michelson interferometer during second step

Fig. 9. Interference patterns of forward simulation. (a) Interference patterns for four-step stepping during daytime; (b) interference patterns for four-step stepping during nighttime

Fig. 10. Profile of wind measurement error