In a low angle scenario, the radar performance is significantly degraded because of the multipath. Time reversal is an efficient technique to improve the target detectability by focusing the energy from different paths. For multiple targets and rich multipath scattering case, the number of echoes is large and the distance estimation is complex. In this paper, a distance estimation method of multiple targets and multipath based on radar time reversal is presented. Utilizing Time reversal transmitting signal as the referring signal, the distance of different paths for different targets can be captured after matched filtering. Then the distance paring method is proposed to group the distance measurements from the same target. Simulations verify the performance of proposed methods.

在低角度情况下，由于多径作用，雷达性能会大大降低。时间反转是一种有效的技术，可以通过聚焦来自不同路径的能量来提高目标可检测性。对于多目标和多径散射丰富的情况，回波数量大，距离估计复杂。提出了一种基于雷达时间反转的多目标多径距离估计方法。利用时间反转发送信号作为参考信号，经过匹配滤波可以捕获不同目标的不同路径的距离。然后提出了距离配对方法，以对来自同一目标的距离测量进行分组。仿真验证了所提出方法的性能。