Han Zhang, Feng Zhu, Hailiang Shi, Jingjing Zhang, Xiang Cao, Xianhua Wang, Hanhan Ye, Yunfei Han. Phase Correction Algorithm for Spaceborne Infrared Fourier Transform Spectrometer Based on Minimum Spectral Imaginary Part[J]. Acta Optica Sinica, 2025, 45(8): 0830001

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- Acta Optica Sinica
- Vol. 45, Issue 8, 0830001 (2025)

Fig. 1. Fourier transform spectrometer scanning working mode

Fig. 2. Interference schematic of Michelson interferometer

Fig. 3. Schematic diagram of linear calibration principle of two points on a star

Fig. 4. Schematic diagram of simplex algorithm

Fig. 5. Phase correction flowchart

Fig. 6. Adaptation value calculation results. (a) Vary with iteration times; (b) vary with offset

Fig. 7. ICT, ES, and DS spectra and phase distributions in LW band. (a) Spectra; (b) phase distributions

Fig. 8. ICT preprocessing. (a) Phase of 30 scan lines; (b) corresponding to offset interferogram; (c) correlation coefficient matrix

Fig. 9. Phase comparisons before and after DS scene correction. (a) Correction phase; (b) comparison of phase difference with ICT

Fig. 10. Comparisons of calibration data of different methods in ES scene. (a) Phase difference with ICT; (b) spectral imaginary part

Fig. 11. Comparisons of NEdN of the real part spectra of DS and the imaginary part spectra of ES before and after correction. (a) MW; (b) SW
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Table 1. Instrument parameter characteristics of HIRAS
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Table 2. Comparisons of methods in LW band
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Table 3. Comparisons of methods in MW and SW band
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Table 4. Comparisons of calibration accuracy in LW band
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Table 5. Comparisons of calibration accuracy in MW band
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Table 6. Comparisons of calibration accuracy in SW band
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Table 7. Comparisons of registration time for different methods

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