L波段微波辐射计周期脉冲式干扰时域检测方法研究  

Research on Detection Methods to Periodic Pulsed Interference for L Band Microwave Radiometer in Time Domain

作　　者：姜涛[1,2,3] 赵凯 万祥坤[1,2] JIANG Tao;ZHAO Kai;WAN Xiangkun(Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China;University of Chinese Academy of Sciences, Beijing 100049, China;Changchun Jingyuetan Remote Sensing Test Station, Chinese Academy of Sciences, Changchun 130102, China)

机构地区：[1]中国科学院东北地理与农业生态研究所,长春130102 [2]中国科学院大学,北京100049 [3]中国科学院长春净月潭遥感实验站,长春130102

出　　处：《电子与信息学报》2018年第7期1539-1545,共7页Journal of Electronics & Information Technology

基　　金：科技部科技基础性工作专项(2014FY201800-4)~~

摘　　要：L波段微波辐射计是探测土壤湿度和海水盐度的有效遥感器。但是,全球定位系统(GPS)信号、雷达信号以及一些商用电子产品的电磁辐射造成的频谱污染都可以对微波辐射计的探测造成干扰,使得被动微波遥感对地观测结果具有一定的偏差,降低了地表参数的反演精度。该文通过实验模拟脉冲式噪声干扰,观测其在L波段(全功率接收型式)微波辐射计系统中的传输特性,分析输出信号特性与辐射计参数(积分时间、灵敏度)的相关性,获取其数字特征参数,结合脉冲检测法(APB),提出一种新的自相关检测(ACD)算法,能够有效用于周期性的脉冲式辐射干扰的检测,在微波辐射计系统积分时间1 ms的情况下,能够检测1.5 K的噪声干扰,满足卫星遥感探测反演地表参数精度的需求。Abstract： L-band passive microwave remote sensing is an effective method for detection of soil moisture and ocean salinity. However, spectrum pollution from Global Positioning System （GPS）, radar and electromagnetic radiation from some commercial electronic products can interfere with the detection of microwave radiometers, it results in a certain deviation to the ground observation, and reduces the retrieval accuracy of the surface parameters. Pulsed noise interference is simulated by experiment, its transmission characteristics in L-band （total power receiver） microwave radiometer system is observed, the correlation between the characteristics of the output signal and the radiometer parameters （integrating time and sensitivity） is analyzed, its digital characteristic parameters are obtained. Combining the method of Asynchronous Pulse Blanking （APB）, a new AutoCorrelation Detection （ACD） algorithm is proposed, which can detect periodic pulsed radiation interference effectively. In the case that microwave radiometer system integrating time is 1 ms, it can detect the noise interference of 1.5 K, which meets the requirement of precision of surface parameters retrieved by satellite remote sensing.

关 键 词：微波辐射计 射频干扰 自相关检测 时域脉冲检测 脉冲辐射干扰 

分 类 号：TP732.1[自动化与计算机技术—检测技术与自动化装置]