星载大气痕量气体差分吸收光谱仪设计及标定技术

Design and In-orbit Performance of the Chinese Environmental Trace Gases Monitoring Instrument

高分五号卫星是我国首颗高光谱综合观测卫星,其上搭载了我国自主研制的大气痕量气体差分吸收光谱仪(EMI),获取紫外至可见谱段的高光谱辐射信息,可用于定量监测二氧化氮、二氧化硫、臭氧等污染气体的全球/区域分布和变化,是我国首台实现大气污染气体探测的星载高光谱载荷。载荷发射后进入在轨测试阶段。待测试完成后,将正式交付用户,进入业务化应用阶段。主要介绍EMI载荷的测量原理、设计方案,总结了在轨信噪比、光谱分辨率、光谱定标精度和辐射定标精度等关键指标,并展示EMI载荷测量的全球NO2、O3分布。测试结果表明,EMI载荷在轨工作状态良好,光谱数据精度高,可应用于全球污染气体产品反演。后续业务化应用可有力支撑大气污染防治、全球气候变化管理等用户需求。

GF-5satellite is the first hyper-spectral observation integrated satellite.Environmental Trace Gases Monitoring Instrument(EMI)is one of the payloads carried on the GF-5satellite,and can derive hyper-spectral information from ultraviolet to visible channel.EMI is China’s first satellite payload that is designed to monitoring global/regional distribution of NO2,SO2,O3and other trace gases.After its launch,phase of in-orbit test is started firstly,and EMI will be put into service after the test。In this paper,the design principle of EMI will be introduced at first.The key parameter of in-orbit performance is summarize,including signal to noise ratio,spectral resolution,radiance calibration accuracy,radiance calibration accuracy,and so on.At last,the first NO2,O3retrieval results from EMI are presented.The results show that EMI has good in-orbit performances and can derive high precision spectrum for retrieval of global trace gases.The following operational application of EMI will support the user requirement for control of air pollution and management of global climate change.