单通道干涉相位无模糊估计快速动目标速度

摘要

为了解决合成孔径雷达地面动目标检测系统中快速运动目标径向速度过大导致模糊的问题，提出一种基于单通道两视干涉相位无模糊估计方法。该方法首先在距离频率构造两视数据，再将两视数据进行干涉处理。利用两视干涉相位与方位慢时间的关系无模糊估计径向速度，该方法具有不受相位缠绕影响的优点。分析了所提算法在杂波背景和多目标情况下的应用，并研究了所提算法应用条件和最大不模糊速度。通过仿真和实测数据处理验证了所提方法的有效性。与基于包络的单通道方法对比分析，所提算法具有估计精度高和运算复杂度低的优点。%To solve the radial velocity ambiguity problem of fast moving targets in the synthetic aperture ra-dar/ground moving targets detection system,a method based on single-channel interferometric phase of two-look data is proposed to estimate the radial velocity unambiguously.The two-look data is constructed in the range frequency domain,and interferometry is processed to obtain the interferometric phase.The relationship between the interferometric phase and the slow time is used to estimate the radial velocity unambiguously, which possesses the advantage of being independent of phase wrapping.The application under clutter back-ground and with multiple targets is analyzed,and the condition and the maximum unambiguous radial velocity are given.Simulated and experimental results demonstrate the effectiveness of the proposed method.Compared with the amplitude-based single channel method,the proposed method possesses the advantages of higher preci-sion and lower computation complexity.