基于SVA的步进频率探地雷达距离旁瓣抑制  

Range side-lobe suppressing in stepped-frequency ground penetrating radar based on SVA

作　　者：周启荣[1] 黄春琳[2] 周阳辉[1] 

机构地区：[1]中国卫星海上测控部,江苏江阴214431 [2]国防科学技术大学电子科学与工程学院,湖南长沙410073

出　　处：《电子设计工程》2013年第20期48-52,共5页Electronic Design Engineering

基　　金：自然科学基金(60602022)

摘　　要：论文分析了步进频率探地雷达距离旁瓣的产生机理及其影响,对传统的线性加权法抑制距离旁瓣效果进行了对比分析,包括时域加权和频域加权,理论和实验结果表明:线性加权法在抑制距离旁瓣的同时容易造成分辨率下降。因此,本文提出基于SVA的步进频率探地雷达距离旁瓣抑制方法,它是一种非线性加权方法,能对时域波形主瓣和旁瓣自适应地选择加权函数,达到保留主瓣抑制旁瓣的目的。仿真结果表明,该方法可以有效地抑制步进频率探地雷达距离旁瓣,旁瓣抑制比提高20 dB,并且具有频谱外推的效果,主瓣展宽仅为5%,相同条件下,采用Hamming窗线性加权则主瓣展宽为50%。The paper analyses the formation mechanism of range side-lobes in SFGPR(Stepped-Frequency Ground Penetrating Radar) and its affection. The range side-lobes suppressed performance of some general linear weighting algorithms, including time weighting and spectrum weighting, are compared. The theory and experiment results show that the traditional linear weighting algorithms can suppress the range side-lobe, but coming with the resolution deteriorating at same time. Therefore,we present an algorithm based on SVA(Spatially Variant Apodization) to suppress range side-lobe of SFGPR. It's a nonlinear weighting algorithm which can choose different spectral weighting functions adaptively for each sample point in time domain to suppress side-lobe and maintain main-lobe. The simulation results show the algorithm can reduce range side-lobe effectively,improve the range side-lobe suppression ratio by 20dB and widen main-lobe by only 5% for spectral extrapolation. However, at the same condition, weighting Hamming function widens main-lobe by 50%.

关 键 词：步进频率 探地雷达 线性加权 SVA 距离旁瓣抑制 

分 类 号：TN958.6[电子电信—信号与信息处理]