基于大气吸收带的超光谱成像仪光谱定标技术研究

Spectral Calibration of the Hyperspectral Imager Based on Atmosphere Absorption

超光谱成像仪是谱像合一的新型光学遥感仪器,其光谱定标的主要任务就是确定超光谱成像仪各通道中心波长和光谱带宽。利用超光谱成像仪光谱采样间隔和大气吸收带中明显的吸收峰对超光谱成像仪进行光谱定标,并通过与定标好的光纤光谱仪结果进行比对,结果显示利用该方法对超光谱成像仪进行光谱定标的定标精度可达1nm。该方法用于棱镜色散型超光谱成像仪光谱定标具有容易实现的特点,并且可以达到较高的定标精度。

The hyperspectral imager is a new type remote se nsor which can collect both the image and the spectral information of the scene. The objective of the spectral calibration of the hyperspectral imager is to det ermine the central wavelength and spectral width of each channel.The spectral s ampling interval of the hyperspectral imager calculated and the atmosphere absor ption of the atmosphere were used to calibrate the central wavelength and spectr al width of the channels of the hyperspectral imager in the present article.Com parison was made between the spectral calibration result and a spectrometer whic h has high spectral resolution and the results were improved.The results indica te that the spectral calibration of this method can achieve precision of 1 nm.