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On-orbit radiation nonlinear calibration method of Fourier transform infrared spectrometer

A Fourier transform, infrared spectrometer technology, applied in the field of infrared payload on-orbit calibration, can solve the problem of non-linear calibration, and achieve the effect of improving data accuracy, ensuring reliability and precision, and wide application range

Active Publication Date: 2019-05-28
SHANGHAI SATELLITE ENG INST
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Problems solved by technology

However, this patent application can only perform linear calibration on the spectrometer, and cannot perform nonlinear calibration on it

Method used

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  • On-orbit radiation nonlinear calibration method of Fourier transform infrared spectrometer
  • On-orbit radiation nonlinear calibration method of Fourier transform infrared spectrometer
  • On-orbit radiation nonlinear calibration method of Fourier transform infrared spectrometer

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Embodiment

[0041] In this embodiment, the method for on-orbit radiation nonlinear calibration of the Fourier transform infrared spectrometer of the present invention comprises the following steps:

[0042] Step 1. Turn on the temperature control of the inner black body on the Fourier transform infrared spectrometer, and control the temperature to the highest temperature control point. During the period of black body temperature control, inner black body free cooling and inner black body reaching equilibrium temperature, the pointing mirror of the Fourier transform infrared spectrometer is periodically aligned with the inner black body and cold space for observation;

[0043]Step 2: Screen the remote sensing data packets of inner black body observations downloaded from the satellite to obtain the temperature point T 1 , temperature point T 2 ,...,Temperature point T n (Temperature from low to high) corresponding remote sensing data, and at the same time obtain the cold space observation...

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Abstract

The invention relates to an on-orbit radiation nonlinear calibration method of a Fourier transform infrared spectrometer, and belongs to the technical field of on-orbit calibration methods of infraredloads. The method comprises the following steps of: step 1, closing the temperature control after the temperature control of an inner blackbody on a satellite reaches the balance of a highest temperature control point, wherein an instrument is periodically aligned with the inner blackbody and a cold space for observation during the inner blackbody temperature control, inner blackbody free temperature reduction and inner blackbody balancing periods, step 2, screening remote sensing data packets observed by the inner blackbody and downloaded by the satellite to obtain a plurality of inner blackbody observation remote sensing data; step 3, calculating uncalibrated spectral digital quantity and spectral radiance observed in the inner blackbody and the cold space; step 4; carrying out least square fitting on every channel in spectral band to obtain nonlinear calibrated coefficients; step 5, calculating target spectral brightness of earth observation by the instrument. The method can determine the nonlinear response relation of the Fourier transform spectrometer and improve the calibration precision and the data inversion accuracy.

Description

technical field [0001] The invention relates to the technical field of on-orbit calibration methods for infrared loads, in particular to an on-orbit radiation nonlinear calibration method for a Fourier transform infrared spectrometer. Background technique [0002] Fourier transform infrared spectrometer has the advantages of high spectral resolution and high sensitivity, and has been widely used in agriculture, meteorology, environment, space technology and other fields. The data directly obtained by the Fourier transform infrared spectrometer is the interferogram of the target, and the subdivided spectrum of the target can be obtained through Fourier transform. The process of converting the spectral digital value into the incident radiance of the target is radiometric calibration. [0003] The on-orbit calibration method of the infrared channel of the traditional spaceborne optical instrument adopts the two-point calibration method, that is, the black body on the star is u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J5/00
Inventor 郭玲玲赵其昌汪少林于淼杨春燕
Owner SHANGHAI SATELLITE ENG INST
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