Interference type spectrometer outlying spectrum response attenuation compensating method
A spectral response and attenuation compensation technology, applied in the field of interferometric spectrometer data processing, which can solve the problems such as the lack of effective processing methods for edge spectral response attenuation, the weakening of the edge spectral response of the interferometric spectrometer, and the impact on the spectral accuracy of the edges on both sides of the spectrum. Compensate for edge spectral response attenuation, improve restoration spectral accuracy, and improve spectral accuracy
Active Publication Date: 2015-11-11
CHINA CENT FOR RESOURCES SATELLITE DATA & APPL
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[0003] In order to obtain a larger spectral range, in the design of an interferometric spectrometer, the spectral range cut off by the filter in the instrument is often basically the same or the difference is small with the output spectral range of the spectrometer, so that the edge spectrum of the spectrometer is affected by the truncation of the input spectrum, resulting in The edge spectral response of the interferometric spectrometer is obviously weakened, which seriously affects the spectral accuracy of the edges on both sides of the spectrum.
There is no effective processing method for the edge spectral response attenuation in the existing interferometric spectrometer data processing flow and method, resulting in low edge spectral accuracy of the interferometric spectrometer. This paper innovatively proposes an interferometric spectrometer edge spectral response attenuation compensation method
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[0043] Below in conjunction with accompanying drawing and specific embodiment the present invention will be described in further detail:
[0044] (1) Apodization
[0045] The interference data I(i) of the interferometric spectrometer is multiplied by the apodization function T(i), as shown in the following formula:
[0046] I T (i)=I(i)*T(i)(1)
[0047] i is the serial number of the interference data;
[0048] I T (i) is the interference data information after apodization.
[0049] (2) Spectral restoration and solving phase error information
[0050] 1) Spectral restoration
[0051] Perform Fourier transform on the interferometric data after apodization to obtain the spectral data of the interferometric spectrometer; the interferometric data and spectral data satisfy the Fourier transform relationship, as shown in formula (2).
[0052] B ( v ) ...
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The invention relates to an interference type spectrometer outlying spectrum response attenuation compensating method. The reason of interference type spectrometer outlying spectrum response attenuation is that input spectrums are rapidly cut off. Consequently, the outlying spectrum responses are relatively weak. The method is characterized in that a simulation method is adopted; certain spectrum and phase information is respectively added into long wave segments and short wave segments beyond a spectrometer spectrum range; corresponding interference simulation data are further generated; the simulation data are superposed on spectrometer interference data to generate new interference data; and spectrum recovering and phase correcting are further performed. In this way, the spectrometer input spectrum range is expanded. The outlying spectrum response attenuation is effectively compensated. The spectrum precision is further obviously improved.
Description
technical field [0001] The invention relates to a data processing method of an interferometric spectrometer, in particular to a method for compensating edge spectrum response attenuation of an interferometric spectrometer. Background technique [0002] The ground object spectral information is obtained through the interference spectrometer, and the interference information and the spectral information satisfy the Fourier transform relationship, and the ground object spectral information can be obtained by performing Fourier transform inversion on the interference information. The interferometric spectrometer has nanoscale spectral resolution, can obtain spectral cube information composed of spatial information and spectral information of ground objects, can identify ground objects meticulously and effectively, and has great application value and broad application prospects. [0003] In order to obtain a larger spectral range, in the design of an interferometric spectrometer,...
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IPC IPC(8): G01J3/45
Inventor林军宋超宇喻文勇李运伟邵俊
OwnerCHINA CENT FOR RESOURCES SATELLITE DATA & APPL