卫星遥感大气的层析扫描反演方法

Atmospheric Remote Sensing by Satellite Tomographic Scanning Retrieval Methods

为了解决卫星气象的迫切需要，提高低层大气常规大气参数测量的精度和垂直分辨率，并兼顾中高层大气研究的需要，借鉴了医学上的ＣＴ扫描反演的思路，发展了一种“卫星层析扫描反演技术”即采用一种具有天底横向扫描；沿轨多角度扫描的中低分辨率传感器，利用ＣＴ反演方法，可以在低层大气中获得１－２ｋｍ垂直分辨率１—１０ｋｍ水平分辨率的温度、湿度廓线的三维分布，能够探测较高层大气，并能快速覆盖全球。采用美国标准大气模式，在理想情况下对探测器光谱通道进行了优化，并利用美国ＮＡＳＡ的实际温度廓线作了模拟计算（考虑了测量噪声）．反演结果表明，理想的层析扫描反演方法的温度反演精度比传统方法显著提高了约４０％。

To improve the accuracy and vertical resolution of conventional atmosphericdata profile at lower atmosphere, which is urgently required for satellite meteorology,and fulfil the requirement of upper atmospheric research, we adopt the idea of CTtechnique and develope a so-called' Satellite Tomographic Scanning Retrieval Method'.Using U. S. Standard Atmosphere, we have optimized the spectral channels inideal condition. We have also conducted a numerical simulation based on a set of 7real temperature profiles from NASA. The results of our simulations showed that theaverage improvement of the accuracy of retrievd temperatures over those using theconventional methods was about 40%, which was significant.