基于双通道距离频率干涉相位解运动目标径向速度模糊方法  

Radial Velocity Ambiguity Resolving Approach for Moving Targets Based on Dual-Channel Interferometric Phase of Range Frequency

作　　者：张学攀[1] 廖桂生[1] 朱圣棋[1] 许京伟[1] 杨东[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,西安710071

出　　处：《宇航学报》2013年第8期1152-1158,共7页Journal of Astronautics

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

摘　　要：针对合成孔径雷达/地面动目标检测系统中动目标径向速度估计存在模糊的问题,提出一种基于双通道距离频率干涉相位解模糊的方法。该方法通过构造干涉相位与距离频率的关系,利用干涉相位随距离频率变化的斜率关系实现径向速度无模糊估计。该斜率与相位缠绕无关,所以所提方法具有不受相位缠绕影响的优点。为了减小噪声对径向速度估计的影响,利用最小二乘线性拟合方法估计该斜率。此方法能实现杂波背景和多目标情况下的应用。通过仿真和实测数据处理验证了所提方法的有效性。The estimated radial velocity can be ambiguous in synthetic aperture radar/ground moving target detection system （SAR/GMTI）. Focus on this problem, a new approach based on dual-channel interferometric phase of range frequency is proposed to resolve ambiguity of radial velocity. Firstly, the linear relationship between interferometric phase and range frequency is obtained. And the slope of interferometric phase respect to range freqN,.~,.~ is utilized to solve ambiguity. Because the phase wrapping has no effect on the slope aforementioned, the propos~.d m^ell,,,d is independent of wrapped phase. And a linear fit method based on least square is used to reduce the effect of noise o,1 the estimation of radial velocity. Meanwhile, the proposed method can resolve the radial velocity ambiguity for multi-target and in clutter environment. Experimental results demonstrate the effectiveness of the proposed method.

关 键 词：合成孔径雷达 地面运动目标检测 径向速度估计 解模糊 干涉相位 

分 类 号：TN957[电子电信—信号与信息处理]