星载漫反射板光谱结构对痕量气体反演精度影响及校正模型建立

Space-borne hyperspectral trace gas remote sensor is applied for quantitatively monitor the global air quality changes and the transmission of pollutant gases distribution. The spectral features of space-borne diffuser will be introduced to the solar reference spectrum, interfering the trace gas absorption structure and the inversion precision of trace gases. The present study focuses on the measurement of spectral features and the production of new diffuser. For the lack of research on the influence of spectral features on trace gases inversion, the influence of space environment on spectral structure and related correction model, the analysis of trace gases inversion and spectral features correction is limited.. To solve these problems, this study intends to build the spectral structure and sample gas testing system in the laboratory. By obtaining spectrum structure and measurement of sample gas, DOAS method is used to inverse the concentration of trace gases. In order to determine the impact of spectral features on different concentrations of trace gases, provide information for satellite data inversion. And then, the influence of space environment on spectral structure is analyzed，on the basis of in-orbit viewing properties and the causes of spectral features, the correction model of spectral features is established. In order to check the accuracy of the model, which is applied to the sample gas test spectrum. This study will further improve the inversion accuracy of trace gases.

星载高光谱痕量气体探测仪能够快速获取全球痕量气体的分布和变化，在对痕量气体反演时，漫反射板光谱结构会干扰痕量气体的吸收结构，影响痕量气体的反演精度。目前的研究侧重于光谱结构的测量和新型漫反射板的制作，定量详细的研究光谱结构对痕量气体反演精度影响、空间环境对光谱结构影响及校正模型的建立还没开展，不能为遥感数据反演及误差分析提供依据，也无法完成光谱结构校正，影响遥感数据的定量应用精度。. 为此，在实验室搭建光谱结构和样气测试系统，完成光谱结构和样气测试，采用DOAS方法反演痕量气体样气浓度，以确定漫反射板光谱结构对不同种类、不同浓度痕量气体反演精度的影响，为卫星遥感数据反演提供依据。并完成空间环境对光谱结构影响及校正模型的建立，将校正模型应用于样气测试光谱中，以校验模型的校正精度，为卫星遥感数据光谱结构校正提供支持。本项目将进一步提高遥感探测中痕量气体的反演精度。

本项目开展了星载漫反射板的光谱结构测试及校正工作，在实验室搭建了光谱结构及样气测试系统，选取1000W紫外增强型氙灯和1000W标准卤钨灯光源测试，获取了不同光源、不同角度、不同距离下的漫反射板光谱图像，分析了漫反射板的光谱结构。利用大气散射光进行了样气测试，其中参考谱由太阳直射光照射漫反射板获取，分析了不同浓度样气分析结果。构建了光谱结构校正模型，实现了漫反射板光谱结构的校正，并将校正方案应用在了高分5号卫星载荷大气痕量气体差分吸收光谱仪在轨的太阳光谱探测数据中，与国外同类载荷的对比结果表明，此方案的校正精度较高。漫反射板光谱结构的校正进一步提高了在轨太阳光谱定标精度，提高痕量气体遥感数据的应用水平。