平飞模式机载双基地SAR动目标检测方法  

Ground moving target detection method of parallel mode airborne bistatic SAR

作　　者：史洪印[1] 周荫清[1] 陈杰[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《北京航空航天大学学报》2009年第8期996-1000,共5页Journal of Beijing University of Aeronautics and Astronautics

摘　　要：提出了一种平飞模式机载双基地SAR地面慢速运动目标检测和参数估计方法.考虑到双基地SAR系统的特点,采用分数阶傅里叶变换(FrFT,Fractional Fourier Transform)技术对动目标进行聚焦,以提高动目标的信杂比.同时结合多通道杂波抑制干涉技术,进一步抑制地杂波并实现动目标参数的精确估计.从双基地SAR的空间几何模型和回波信号入手,推导了杂波对消时收发雷达载机所需满足的飞行条件和慢动目标参数估计的方法.最后通过计算机仿真,验证了该算法的有效性.A method of slow-moving ground target detection and parameter estimation with parallel mode airborne bistatic three-channel synthetic aperture radar （SAR） was presented. According to the characteristic of bistatic SAR, fractional Fourier transform （FrFT） technique was adopt to focus the moving target and improve the signal to clutter ratio, clutter suppression interferometer techniques was adopt then to suppress clutter and estimate the parameters of moving target accurately. From the spatial geometry model and echo signal model of the system, the flying condition of transmitting and receiving plane must satisfy when clutter be eliminate and the method of moving target parameters estimation were derived. Finally, computer simulation results validate its effectiveness.

关 键 词：合成孔径雷达 双基地 地面动目标检测 杂波抑制 分数阶傅里叶变换 

分 类 号：TN957.5[电子电信—信号与信息处理]