东亚陆地星载微波成像仪新增通道观测质量评估
投稿时间: 2016-04-15  最后修改时间: 2016-06-26  点此下载全文
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官莉 南京信息工程大学 气象灾害预报预警与评估协同创新中心/中国气象局气溶胶与云降水重点开放实验室, 江苏 南京 210044 liguan@nuist.edu.cn 
任心怡 南京信息工程大学 气象灾害预报预警与评估协同创新中心/中国气象局气溶胶与云降水重点开放实验室, 江苏 南京 210044  
基金项目:国家自然科学基金资助项目(41575029);江苏省"六大人才高峰"项目(2014JY021)
中文摘要:基于2014年8月1—16日AMSR-2的观测资料,采用谱差法重点对东亚陆地低频7.3 GHz的无线电频率干扰(RFI)进行识别与分析。研究发现,东亚地区7.3 GHz通道观测存在无线电频率干扰,其中韩国京畿道、大邱市,孟加拉国,越南及柬埔寨东南部地区的干扰源是稳定、持续的地面主动源。日本地区7.3 GHz通道RFI仅出现在AMSR-2升轨观测上,而降轨观测则几乎不受干扰,且RFI污染区出现的位置与强度随时间及辐射计扫描角度周期性变化,探究其污染源,发现主要来自地面反射的静止通信/电视卫星信号对星载微波被动传感器观测的干扰。
中文关键词:微波遥感  AMSR-2  无线电频率干扰
 
The observation quality assessment of satellite borne microwave imager at new-added frequency over East Asia land
Abstract:The quality control of satellite observations has shown significant impact on data assimilation as well as retrieving meteorological products.Satellite microwave thermal emission mixed with signals derived from the active sensors,e.g.radar technologies,air traffic control system,garage door opener remote control,applications of the global positioning system to intelligent vehicle highway systems,defense transportation tracking system,vehicle speed detection system,etc.,is referred to as radio-frequency interference(RFI).RFI remarkably causes serious problem for microwave sensing.Comparing with previous advanced microwave scanning radiometer-EOS (AMSR-E),AMSR-2 which is on board the global change observation mission 1st-water(GCOM-W1) satellite,and adds the channels at 7.3 GHz,in order to mitigate the RFI contamination at lower frequencies.AMSR-2 has seven frequencies at 6.9,7.3,10.65,18.7,23.8,36.5,and 89.0 GHz,each having dual channels at vertical and horizontal polarization states,respectively.In order to analyze the observations at this new-added channel be interfered or not,RFI at 7.3 GHz over East Asia is identified using spectral difference method based on AMSR-2 observations collected from August 1st to 16th,2014.The achieved results showed that RFI at 7.3 GHz widely spreads over East Asia in some places.The RFIs located in Gyeonggi-do Province,South Korea,Bangladesh,Vietnam and,South-East Cambodia are isolated in space and persistent in time and originate from a wide variety of coherent point target sources.The observations of spaceborne microwave radiometer in ascending orbit portions usually are interfered over Japan,while no RFI approximately was detected in descending portions.The RFI location and intensity varied with time and radiometer scanning angle within observation period.After analyzing the contamination source,it can be concluded that the source of RFI in Japan is the results of the interference of the reflected geostationary communication or down linked satellite signals with the spaceborne microwave radiometer data.
keywords:Microwave remote sensing  AMSR-2  radio-frequency interference
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