Spectrum drifting detection method for interference type hyperspectral imager

Abstract

The invention discloses a spectrum drifting detection method for an interference type hyperspectral imager. The method comprises the following steps: (1) converting the spectroscopic data of a hyperspectral imager into radiance on entrance pupil position of each wave band to serve as spectrum radiance to be detected; (2) obtaining the radiance on entrance pupil position of satellite height; (3) obtaining radiance on entrance pupil position of each wave band by the response function of the hyperspectral imager to serve as reference spectrum radiance; (4) comparing the positions of the spectrumradiance to be detected and the reference spectrum radiance on an atmospheric absorption peak, determining whether the offset of the spectrum radiance to be detected and the reference spectrum radiance by a judgment function; turning to the step (5) if yes; otherwise, regulating the regulation amount of wave band and bandwidth in the response function of the hyperspectral imager, and circularly judging from step (3); and (5) carrying out inverse fast Fourier transform to the interference data of the hyperspectral imager for the hyperspectral imager spectrum drifting amount determined when a constraint condition is satisfied to obtain a spectrum data graph of the hyperspectral imager, which removes spectrum drifting.

Description

technical field [0001] The invention relates to a spectral drift detection method of an interference type hyperspectral imager, in particular to a spectral drift detection method of an environmental disaster reduction satellite hyperspectral imager. Background technique [0002] The interferometric hyperspectral imager uses the corresponding relationship between the interferogram and the light source spectrum, and obtains the spectrogram by inverting the interferogram through Fourier transform. Radiation information and spectral information are widely used in military and civilian fields, and have great application value and broad development prospects. [0003] Interferometric hyperspectral imagers often use equal wavenumber intervals to divide spectral data into multiple channels, up to more than 100 channels, and the bandwidth of each channel is only a few nanometers. Therefore, the accuracy of spectral calibration not only affects the accuracy of radiometric calibration ...

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Problems solved by technology

[0005] Due to the particularity of the imaging principle of the interferometric hyperspectral imager - the imager receives the Fourier transform information of the spectrum of the ground target, only the powerful small satellites of the United States adopt this imaging principle abroad, and the interferometric hyperspectral imager has just started in China So far, there is no detection method for the on-orbit spectral drift of the interferometric hyperspectral imager in domestic and foreign literature.

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