基于全链路仿真的静止轨道毫米波大气探测性能研究
投稿时间:2020-05-23  修订日期:2020-07-14  点此下载全文
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作者单位E-mail
陈柯 华中科技大学 chenke@hust.edu.cn 
郑照明 华中科技大学  
蔡保国 武汉船舶通信研究所  
安大伟 国家卫星气象中心 andawei@cma.gov.cn 
谢振超 上海航天电子技术研究所  
李泽宇 华中科技大学  
基金项目:上海航天科技创新基金项目
中文摘要:针对我国发展地球静止轨道(GEO)毫米波大气探测技术的迫切需求与实践空白,采用我国候选的GEO实孔径辐射计载荷方案,开展了从50~425GHz频段观测亮温模拟正演到大气温湿廓线反演的全链路GEO被动毫米波大气探测仿真实验研究,对台风场景下GEO观测亮温精度和探测大气温湿廓线精度及其影响因素进行了定量分析与评估。结果表明辐射计载荷的两个关键要素——天线波束宽度和噪声——对不同频率通道亮温精度的影响程度有较大差异;在当前的GEO辐射计载荷指标下,静止轨道毫米波大气温湿廓线探测精度与极轨相当;GEO新增的380GHz和425GHz太赫兹探测频段以及BG亮温重建算法都能够有效提升大气温湿廓线的探测精度。以上研究可为我国静止轨道毫米波大气探测载荷设计与应用提供理论依据和科学指导。
中文关键词:静止轨道  被动毫米波遥感;大气探测;观测亮温模拟正演;大气温湿廓线反演;全链路仿真
 
Research on performance of geostationary orbit millimeter-wave atmospheric soundings based on end to end simulations
Abstract:Aiming for development of geostationary orbit (GEO) millimeter-wave atmospheric sounding technology, the sophisticated end-to-end simulation experiments based on the candidate real-aperture radiometer schemes for China future GEO atmospheric sounding mission, including 50~425GHz observation brightness temperatures forward and atmospheric profiles retrieval, are conducted to quantitatively examine the accuracy of GEO observation brightness temperature and the estimated atmospheric temperature and humidity profiles under the tropical cyclones conditions in this paper. Then the various factors affecting the accuracy are analyzed. The results show that the two major factors of the radiometer, the antenna beam width and the system noise, play the difference roles in the reduced accuracy of GEO observed brightness temperature for each frequency channel. The accuracy of the retrieval atmospheric temperature and humidity profiles from GEO sounding simulation is comparable to that of the polar orbit. And the contrast results of the retrieval profiles with and without 380 GHz and 425 GHz bands indicate that the accuracy of retrieval profiles can be improved effectively by the new terahertz bands of GEO atmospheric sounding. In additional, BG reconstruction algorithm can also decrease the retrieval errors. The above research can provide scientific basis and technical support for the development decision maker of GEO millimeter-wave atmosphere sounding research.
keywords:geostationary orbit,passive millimeter-wave remote sensing, atmospheric sounding,observation brightness temperatures forward, atmospheric temperature and humidity profiles retrieval, end to end simulation
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