多径环境下的无源分布式孔径雷达成像方法  

Passive radar imaging using distributed apertures capable of operating in multipath environments

作　　者：汪玲[1] 卜晓楠[1] 庞铄[1] 伍少华[1] 

机构地区：[1]南京航空航天大学电子信息工程学院,江苏南京210016

出　　处：《系统工程与电子技术》2013年第1期61-67,共7页Systems Engineering and Electronics

基　　金：国家自然科学基金(61001151);江苏高校优势学科建设工程资助课题

摘　　要：研究多径环境下分布式孔径无源雷达成像方法,首先针对分布式孔径探测,给出一种新的无源雷达回波模型,该模型适用于复杂的多径散射环境,而且不需要已知发射源信息。然后研究一种基于二元假设检验的成像方法,依据最大信噪比原则构造检验统计量,该统计量依赖于空间位置信息,通过对成像区域中的每个位置进行检测,可实现空间分辨,获得成像结果。接着详细分析该方法在多径散射环境中的性能,并在模拟多径环境中采用地面数字电视信号对成像方法进行仿真实验验证。理论分析和实验结果表明,采用空间可分辨的检验统计量形成图像可以正确重建目标,并且可利用多径效应进行成像。A passive radar imaging method using distributed apertures capable of operating in multipath en- vironments is studied. First, a signal model of passive radar using distributed apertures is presented, which does not need any information of the transmitter and is applicable to multipath environments. Then, an imaging method based on binary hypothesis testing is investigated where a spatial-resolved test-statistic is determined ac- cording to the signal-to-noise ratio maximization criterion. The resulting image is formed by the test-statistic evaluated at each hypothetical target location. The performance of the imaging method in multipath environ- ments is analyzed in detail, and the digital video broadcast-terrestrial signal is used to demonstrate the perform- ance of the proposed imaging method in a simulated multipath environment. The theoretical analysis and experi- mental results show that the target can be reconstructed correctly using the proposed imaging method and the multipath propagation can be used for the imaging.

关 键 词：无源雷达 成像 二元假设检验 分布式孔径 多径 

分 类 号：TN958.97[电子电信—信号与信息处理]