The Space-borne Infrared Imaging Fourier Transform Spectrometer (SBFTS) carried by FY-4 meteorological satellite
is one of infrared remote sensing instruments. It acquires the temperature, pressure and humidity of atmosphere on
geostationary orbit, and supplies the input data for numerical weather prediction. It not only can detect the spectrum of
the target but also can imaging. The SBFTS carry 16×4 plane array detectors. For the proper use of the SBFTS it is
imperative to provide high quality spectral characterization and characterizations of the instrument line shape (ILS).
Objective: This paper's mainly analyses the off-axis factor that influence the ILS of SBFTS and convinces it through
experiment. And the spectral calibration of SBFTS is according to the ILS. Methods: The accuracy of
spectral-calibration of SBFTS lies on its ILS. First, the main factors that will influence the ILS are discussed here. They
are the finite optical path difference and the off-axes effect because of using plane array detectors. The ILS of Fourier
transform spectroscopy is influenced by the angular distribution of light in the interferometer's off-axis detector. The
paper studies the effect to spectral calibration by off-axis detectors, and then makes ILS simulation for rectangular
detector based on the sounder's 16×4 plane array detectors structure. The absorption line shape of CO is Lorentzian
distribution in the laboratory environment. Now the ILS and the absorption line shape of the CO are given. They can be
combined to the instrument detecting line shape theoretically. So the theoretical position of the absorption peak detected
by the SBFTS is acquired. The frequency of absorption peak is
red-shift. And the spectrum is broadened. According to
the reference spectrum the spectrum calibration coefficients of each pixel is derived. And the absorption peak of CO
also can be detected using the gas cell methodology. Finally the calibration coefficients are used to calibrate the
spectrum of CO detected by the SBFTS. Results: The spectral-calibration coefficients of each pixel are presented and
proved by the calibration experiment of CO. The relative calibration accuracy is up to 10-6.
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