基于熵的步进频率探地雷达距离旁瓣抑制  

Range Side-Lobe Suppression Based on Entropy in Stepped-Frequency Ground Penetrating Radar

作　　者：周启荣[1] 黄春琳[1] 陆珉[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,湖南长沙410073

出　　处：《雷达科学与技术》2008年第5期361-365,共5页Radar Science and Technology

基　　金：国家863计划项目(No.2007AA12Z117)

摘　　要：步进频率探地雷达因频谱截断和杂波干扰而产生严重的拖尾旁瓣,降低了系统分辨目标的能力。文中分析了熵表征的信号特征,从距离旁瓣产生的机理出发,提出用最大熵、最小熵谱外推技术对截断频谱外推,降低频谱截断产生的拖尾旁瓣。实验结果表明,最大熵可以有效地去除因频谱截断产生的Gibbs振荡,最小熵对峰值旁瓣电平抑制效果较好,两者都有效地提高了系统分辨率。Stepped-frequency ground penetrating radar（SFGPR） has high side lobe for its truncated spectrum and companied clutter, which decreases the system ability of resolving targets. This paper analyses the signal character described by entropy, and considering the reasons for range side-lobe, presents the use of maximum entropy spectrum extrapolation and minimum entropy spectrum extrapolation methods to extrapolate the truncated spectrum, which decreases side-lobe resulted from truncated spectrum. The simulation result shows that the maximum entropy can remove Gibbs vibration effectively, the minimum entropy is effective for peak side-lobe level suppression, and both of them improve system resolution.

关 键 词：步进频率 探地雷达 最大熵 最小熵 旁瓣抑制 

分 类 号：TN958.6[电子电信—信号与信息处理] TN959.71[电子电信—信息与通信工程]