高分五号卫星大气主要温室气体监测仪优化设计及数据分析

Optimum Design and Data Analysis of Greenhouse Gases Monitoring Instrument on GF-5 Satellite

大气主要温室气体监测仪(GMI)作为高分五号卫星有效载荷之一,其主要作用是对CO2和CH4全球浓度分布变化进行定量监测,为温室气体的源汇分析提供数据支持。该载荷基于新型空间外差静态干涉技术,实现高信噪比下温室气体指纹区光谱超分辨精细探测。首先总体介绍了大气主要温室气体监测仪工作原理和探测方案,其中非对称一体化胶合干涉仪设计在保证了结构稳定且小型化和轻量化同时,有效提升了光谱分辨率。在当前窄带滤光片加工水平基础上,通过干涉仪胶合零频控制和光学系统优化设计,实现了系统杂散光抑制和光谱范围的最大化利用。最后对载荷在轨实测数据进行了分析,结果表明:载荷在轨性能参数与地面测试一致性良好,为温室气体浓度高精度探测奠定基础。

Greenhouse gases monitor instrument(GMI),as one of the payloads of the GF-5satellite,the main function is to quantitatively monitor the changes of global concentration distribution of CO2and CH4,and to provide data support for the source and sink analysis of greenhouse gases.Based on the new space heterodyne static interferometry spectroscopy,the payload can realize the super-resolution and fine detection of greenhouse gas fingerprint spectrum under high signal-to-noise ratio.Firstly,the working principle and detection scheme of GMI are introduced.The design of asymmetric integrated gluing interferometer effectively improves the spectral resolution while ensuring stable structure,miniaturization and lightweight.On the basis of the current manufacturing level of narrowband filter,the system stray light suppression and the maximum utilization of spectral range are realized by adjusting the interferometer zero frequency and the optical system optimization design.Finally,the measured data of load in orbit are analyzed,and the results show that the performance parameters of load in orbit are consistent with that of ground laboratory test,which lays a foundation for high precision detection of greenhouse gas concentration.