文章摘要
GMI亮温资料RFI信号影响因子分析
Analysis of influence factors of radio frequency interference signals in GMI brightness temperature data
投稿时间:2021-12-09  修订日期:2022-02-27
DOI:
中文关键词: GMI  亮温  无线电频率干扰  影响因子
英文关键词: GMI  brightness temperature  radio-frequency interference  influencing factors
基金项目:国家自然科学基金项目(41975046,41305033)资助.
作者单位地址
张玉璇 南京信息工程大学 南京市宁六路219号
吴莹 南京信息工程大学 
摘要点击次数: 86
全文下载次数: 0
中文摘要:
   利用全球降水测量卫星(Global Precipitation Measurement,GPM)上搭载的微波成像仪(GPM Microwave Imager,GMI)的一级亮温数据,通过谱差法识别被无线电频率干扰(Radio Frequency Interference,RFI)污染的典型地区,确定欧洲大陆、东亚和南美作为主要研究区域,进一步分析RFI与卫星方位角、太阳方位角和太阳天顶角之间的关系,讨论RFI的影响因子。结果表明:水平极化方式下受RFI影响的区域范围比垂直极化方式下的范围更广;相对于强RFI信号分布的较宽的卫星方位角区间,存在RFI的像素点对应的太阳方位角和太阳天顶角角度区间范围较为集中;当RFI强度较弱时,垂直极化方式下的RFI的像素点远多于水平极化方式下的RFI像素点,但随着RFI强度的增强,水平极化方式下的RFI的像素点多于垂直极化方式下的RFI像素点,且强度越大则两种极化方式下的RFI像素点数量差距越大。
英文摘要:
   Using Leve-1B brightness temperature data from the GPM Microwave Imager (GMI) aboard the Global Precipitation Measurement Satellite (GPM), the typical regions contaminated by Radio Frequency Interference (RFI) are identified by spectral difference method, and the European continent, East Asia and South America are selected as the main research areas. The relationship between RFI and satellite azimuth angle, solar azimuth angle and solar zenith angle is further analyzed, respectively. And the impact factors of RFI are also discussed. The results show that the area affected by RFI is wider in horizontal polarization mode than in vertical polarization mode. Compared with the wide satellite azimuth range of strong RFI signal distribution, the range of solar azimuth and solar zenith angle corresponding to the pixels of RFI is relatively concentrated. When the RFI intensity is weak, the pixels of RFI in vertical polarization mode are much more than those in horizontal polarization mode. However, as the intensity of RFI increases, the number of RFI pixels in horizontal polarization mode is more than that in vertical polarization mode, and the greater the intensity is, the greater the difference between the number of RFI pixels in the two polarization modes is.
View Fulltext   查看/发表评论  下载PDF阅读器
关闭