星载大气痕量气体差分吸收光谱仪光谱定标技术研究

摘要

星载大气痕量气体差分吸收光谱仪用于遥感监测痕量气体的全球分布.该载荷探测地球大气或表面反射、散射的紫外/可见光辐射,利用差分吸收光谱算法来解析痕量污染气体成分的分布和变化.光谱定标是仪器遥感数据定量化的前提和基础,定标的精度直接决定了仪器研制和应用水平的高低.针对星载大气痕量气体差分吸收光谱仪视场大、波长宽、空间分辨率和光谱分辨率高的特点,提出了相应的光谱定标方法,建立了定标装置,通过寻峰和回归分析计算光谱定标方程,实现了对载荷的全视场光谱定标工作.并利用太阳光的夫琅禾费线对定标精度进行了检验.%Space-borne differential optical absorption spectrometer is used for remote sensing of atmospheric trace gas global distribution. This instrument acquires high accuracy UV/Vis radiation scattered or reflected by air or earth surface, and can monitor distribution and variation of trace gases based on differential optical absorption spectrum algorithm. Spectral calibration is the premise and base of quantification of remote sensing data of the instrument, and the precision of calibration directly decides the level of development and application of the instrument Considering the characteristic of large field, wide wavelength range, high spatial~and spectral resolution of the space-borne differential optical absorption spectrometer, a spectral calibration method is presented, a calibration device was built, the equation of spectral calibration was calculated through peak searching and regression analysis, and finally the full field spectral calibration of the instrument was realized. The precision of spectral calibration was verified with Fraunhofer lines of solar light