双通道两视干涉相位差解径向速度模糊方法  

Solution to radial velocity ambiguity by dual-channel two-look interferometric phase difference

作　　者：张学攀[1] 廖桂生[1] 朱圣棋[1] 杨东[1] 高永婵[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071

出　　处：《西安电子科技大学学报》2014年第3期14-19,87,共7页Journal of Xidian University

基　　金：国家973计划资助项目(2010CB731903);国家自然科学基金资助项目(61101249);长江学者和创新团队发展计划资助项目(IRT0954)

摘　　要：针对合成孔径雷达地面动目标显示(SAR-GMTI)系统中动目标径向速度估计存在模糊的问题,提出了基于双通道两视干涉相位差实现无模糊估计径向速度的方法.该方法在距离频率域构造两视数据,将不同通道数据做干涉处理以得到两视数据的干涉相位.两视数据的干涉相位差不存在缠绕问题,可以用来无模糊地估计径向速度.理论推导证明,所提方法有效提高了最大不模糊速度.文中着重分析了两视数据距离频率间隔对径向速度估计性能的影响.通过仿真和实测数据处理验证了所提方法.Based on dual-channel two-look interferometric phase difference , a new method is proposed to estimate the radial velocity of a moving target unambiguously in the synthetic aperture radar/ground moving target indication （ SAR/GM TI） system . The two-look data is constructed in the range frequency domain , and interferometric phases of two-look are obtained by interferometry between the data of different channels . Since the interferometric phase difference of the two-look is not wrapped , the proposed method can be used to estimate the radial velocity of a moving target unambiguously . And the maximum unambiguous radial velocity is effectively improved by the proposed method . The effect on radial velocity estimation by the interval of the two-look data in range frequency is focused . Numerical and real data are processed to demonstrate the effectiveness of the proposed method .

关 键 词：地面动目标指示 合成孔径雷达 径向速度无模糊估计 双通道两视干涉相位差 

分 类 号：TN959.1[电子电信—信号与信息处理]