一种基于回波相关的无源合成孔径雷达成像方法  

An Echo-correlation Based Passive Imaging Method for Synthetic Aperture Radar

作　　者：张璇[1] 汪玲[1] 

机构地区：[1]南京航空航天大学电子信息工程学院,南京210016

出　　处：《电子与信息学报》2012年第6期1511-1515,共5页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61001151)资助课题

摘　　要：利用机会照射源的无源雷达因为可以解决频带拥挤和具有良好的电子对抗性能,是雷达领域的一个研究热点。鉴于大多数机会照射源发射窄带或超窄带的连续波信号,该文研究采用窄带连续波信号的无源合成孔径雷达(SAR)成像。通过不同接收机回波之间进行相关,建立成像的数据模型,并给出一种滤波反投影(FBP)成像算法,详细分析了影响该成像方法分辨率的因素。通过仿真实验,验证了基于回波相关和FBP的无源SAR成像方法。该方法无需发射机位置信息,适用于任意载机飞行轨迹。Due to the capability of solving the band crowd and good performance in electromagnetic countermeasure,passive radar using illuminators of opportunity is an active research area in recent years.Taking into account the fact that most illuminators of opportunity transmit narrowband or ultra-narrowband Continuous Wave（CW） waveforms,a novel image formation method is presented for passive synthetic aperture radar（SAR） using narrowband CW waveforms.First,the data model is built up for imaging by correlating the signals received from different airborne receivers.Then an image formation method is presented using the Filtered-BackProjection（FBP） technique.Various potential factors that influence the quality of the imaging are analyzed.Finally,numerical simulations demonstrate the performance of the echo-correlation-and-FBP based passive SAR imaging method.This method does not require a priori knowledge about the transmitter locations and is applicable to the case where the radars are travelling along arbitrary flight trajectories.

关 键 词：无源雷达 合成孔径雷达 成像 滤波反投影 多普勒 

分 类 号：TN957.52[电子电信—信号与信息处理]