基于二维OSF的电离层后向散射雷达干扰滤除  

Filtering the interference of ionospheric backscatter radars by using 2D OSF

作　　者：王烽[1] 赵正予[1] 李婷[1] 

机构地区：[1]武汉大学电子信息学院,湖北武汉430079

出　　处：《华中科技大学学报（自然科学版）》2009年第7期18-21,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(40474066)

摘　　要：提出了一种基于二维排序统计滤波器(OSF)的方法,滤除电离层后向散射探测中存在的随机冲激噪声与射频干扰.该方法利用电离层后向散射中随机冲激噪声在时间、空间和多普勒频域的不相关性和射频干扰在频域的不相关性,估计在一定时间、空间或频率窗口内回波强度的排序统计量作为滤波器的输出,可以分别滤除后向散射函数图和后向散射电离图中的冲激噪声和射频干扰.对于射频干扰和冲激噪声混合在一起的情况,通过调整滤波器滑动窗口大小和调整滤波器排序统计量输出,可以同时滤除这两种干扰,简化了处理步骤.实测数据处理结果表明,该方法能明显提高回波图质量.A technique based on 2D OSF （order statistics filter） was proposed to filter impulsive noise and radio frequency interference （RFI） in ionospheric backscatter sounding. This technique, in which the non-correlation of impulsive noise in time, space and Doppler frequency and non-correlation of RFI in frequency were used, estimated the order statistic of echo＇s amplitude in a fixed time, space or frequency window as the output of filter which can filter impulsive noise and RFI in raw backscatter function diagram and backscatter ionogram separately. In the case of impulsive noise and RFI mixing together, they can be simultaneously filtered by changing the sliding window size and outputting order statistic of filter, and filtering procedure was simplified. Processing result of measured data demonstrates this technique can markedly improve the quality of echo＇s diagram.

关 键 词：后向散射雷达 电离层探测 雷达数据处理 排序统计滤波 冲激噪声 射频干扰 

分 类 号：TN957.52[电子电信—信号与信息处理]