An FTS instrument is proposed for a part of active and passive sensor combination of the EarthCARE mission, jointly proposed to the 2nd ESA earth explorer selection. The FTS will be a compact 4-ports dual pendulum design with 0.5 cm-1 spectral resolution to cover 400-2000 cm-1 region. The IFOV is 10 by 10 km square to coincide with other passive instruments, and the observation is contiguous which is required for the EarthCARE.
The interferometric Monitor for Greenhouse gases (IMG) measured the high-resolution infrared spectra emitted from Earth from October 1996 to June 1997. It is a Fourier Transform Spectrometer based on the Michelson interferometer achieving 0.05 cm-1 wavenumber resolution and covers between 660 cm-1 and 3030 cm-1 with three infrared detectors. Since detectors are large and are not located in the center of the field of view (FOV), the instrument line shape (ILS) is shifted and widened. In this paper, we describe the ILS theoretical model and evaluate it by comparing the synthesized spectrum with the IMG observed spectrum. We checked the improvement of ILS by the FOV geometry. The retrieval accuracy will be improved by using this ILS model in the retrieval program.
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