基于ATI的双通道UWB SAR运动目标检测和距离向速度估计  

Moving Target Detection and Velocity Estimation via Along Track Interferency Using Two-Channel UWB SAR

作　　者：常玉林[1] 黄晓涛[1] 周红[1] 周智敏[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院超宽带室,湖南长沙410073

出　　处：《信号处理》2008年第5期742-746,共5页Journal of Signal Processing

基　　金：装备预先研究项目资助

摘　　要：本文对基于ATI的双通道UWB SAR运动目标检测和距离向速度估计算法进行了研究。针对运动目标易在UWB SAR图像上散焦的特点,本文对运动目标在双通道UWB SAR图像上散焦像轨迹之间的位置关系及干涉相位进行了分析;针对ATI算法运动目标检测中的盲速现象和距离向速度估计时的距离向速度模糊现象,本文根据UWB SAR大相对带宽的特点,提出了一种多频子带ATI方法消除盲速区、解除距离向速度模糊,该方法只需两部接收天线,相比多基线方法可大大节省硬件成本。基于半实测数据的实验证明了本文所提理论正确性和算法的有效性。In this paper we study the principle and implementation of along track Interferency for two channel UWB SAR systems. To cope with the defocus of the moving targets in the UWB SAR images ,we propose the ATI method for defocus moving targets. To avoid the problem of blind speed and range velocity wrap ,we propose a multiple sub-band ATI method. The method first subdivide the UWB SAR images into a set of two channel data at different frequencies,and then using them to obtain multi-frequency interferograms. The proposed method can overcome the problem of blind speed and can suppress the velocity ambiguity only using two channel UWB SAR data. The theory and method have been proved to be correct based on emulated and haft real data.

关 键 词：ATI UWB SAR GMTI 盲速 多频干涉 

分 类 号：TN958[电子电信—信号与信息处理] TP391.41[电子电信—信息与通信工程]