成像光谱仪星上定标技术

成像光谱仪是同时获取地物图像和光谱信息的新一代光学遥感仪器。星上定标是成像光谱仪光谱图像数据定量化应用的基础。本文阐述了成像光谱仪星上定标的原理，按照星上定标采用的参考标准对星上定标技术进行了分类，详细介绍了星上辐射定标和光谱定标技术，并展望了成像光谱仪未来发展趋势。绝对辐射定标已经成为成像光谱仪星上定标的基本要求，太阳将逐步代替星上标准灯成为绝对辐射标准。基于不同参考标准的定标方法的综合应用将使星上定标精度和可靠性大大提高。随着定标精度的进一步提高，地面光谱定标装置将逐步空间化，基于探测器的星上辐射定标系统也将逐步得到应用。

Onboard calibration technologies for hyper-spectral imager

The Hyper-spectral Imager (HSI) is a kind of new optical remote sensor that can simultaneously obtain imaging and spectral information of ground targets. Onboard calibration is the basis for space-borne HSI to obtain accurate quantified spectral imaging data. In this paper, we firstly presented the principles of onboard calibration for HSI; then made a classification of the onboard calibration technologies according to the different calibration references, and reviewed the onboard radiometric and spectral calibration technologies for HSI; finally, made an expectation to the development of the onboard calibration technologies in the future. Absolute radiometric calibration has already been the basic requirement of the radiometric calibration of HSI, and solar radiance will gradually take place of onboard lamps to be the absolute radiometric calibration reference. The calibration accuracy and reliability will be greatly enhanced by the combination of multi calibration technologies based on different calibration references. With the enhancement of the calibration accuracy, ground spectral calibration assembly will be used in the space and detector-based radiometric calibration systems will be generally taken into application in the onboard radiometric calibration.