On-Board Spectral Calibration for Chinese Medium Resolution Imaging Spectrometer

Abstract

Spectral calibration is the basis for space-borne spectral imager to obtain accurately quantified spectral imaging data. The random vibrations during the launch process and the change of space environment will influence the veracity of ground spectral calibration. So the on-board spectral calibration is necessary to a space-borne spectral imager. Considering the specific mission requirements including the spectral range and 1 nm wavelength accuracy of Chinese Medium Resolution Imaging Spectrometer (CMERIS), the on-board spectral calibration is achieved by rare earth doped diffuser plate combining the Fraunhofer absorption lines and oxygen A-band. And the ground simulation was introduced in Sect. 3, which employs well-defined equations to calculate spectral calibration through data processing including unitary calculation, peak searching and regression analysis. Finally, the results of the simulation were verified by the standard lines of mercury lamp and the filter wavelengths. These results can satisfy the spectral calibration requirement of 1 nm wavelength accuracy.