基于最优阈值选择的L波段测风雷达杂波抑制方法  

Clutter suppression method for L band wind measurement radar based on optimal threshold selection

作　　者：朱彩霞 李红英 马廷德 王凯 ZHU Caixia;LI Hongying;MA Tingde;WANG Kai(Jiuquan Meteorological Bureau Gansu Province,Jiuquan 735000,China)

机构地区：[1]甘肃省酒泉市气象局,甘肃酒泉735000

出　　处：《电子设计工程》2024年第23期17-20,26,共5页Electronic Design Engineering

基　　金：甘肃省自然科学基金(22JR5RF1080)。

摘　　要：针对L波段测风雷达杂波尖峰干扰,使得测风雷达信号表现出奇异特性的问题,提出了基于最优阈值选择的L波段测风雷达杂波抑制方法。设计浮动阈值子波杂波处理器,采用最佳阈值控制虚警概率参量。根据测风雷达杂波测量原理,计算杂波的测风雷达接收功率。跟踪测风雷达在分辨单元天线波束中的主轴俯仰角,消除测风雷达定位误差引起的噪声脉动,实现雷达杂波的精准秒级跟踪。建立二维杂波网格单元,结合最优阈值选择方法,提取L波段测风信息滤波后的低频系数,获取雷达测风信道的频率域,达到杂波抑制的目的。由外场试验结果可知,所研究方法能够有效抑制杂波,I、Q路信号波动幅度范围分别为0.5~1.5 dbm、-1.5~-0.5 dbm,与原始波形一致。A clutter suppression method for L band wind measurement radar with optimal threshold selection is proposed to address the issue of clutter spikes interfering with L band wind measurement radar signals that exhibit singular characteristics.Design a floating threshold wavelet clutter processor and use the optimal threshold to control the false alarm probability parameter.According to the principle of wind radar clutter measurement,calculate the received power of wind radar for clutter.Tracking the elevation angle of the main axis in the resolution unit antenna beam of the wind measurement radar eliminates noise pulsation caused by the positioning error of the wind measurement radar,and achieves accurate second level tracking of radar clutter.Establish a two-dimensional clutter grid unit,combined with the optimal threshold selection method,extract the low-frequency coefficients of the L band wind measurement information filtered,and obtain the frequency domain of the radar wind measurement channel to achieve the purpose of clutter suppression.From the field test results,it can be seen that the studied method can effectively suppress clutter.The fluctuation amplitude range of the I and Q signals is 0.5~1.5 dbm and-1.5~-0.5 dbm,respectively,which is consistent with the original waveform.

关 键 词：最优阈值选择 L波段 测风雷达 杂波抑制 

分 类 号：TN957[电子电信—信号与信息处理]