基于延迟锁定环跟踪对消技术的穿墙雷达杂波抑制

穿墙雷达成像中，墙体反射波等杂波严重影响成像效果.针对现有子空间技术等方法在去杂波同时会对目标信息造成消减这一问题，本文采用M序列雷达，提出一种多级延迟锁定环路技术.该方法对墙体反射波、直达波等强杂波时延分别进行准确估计，重建干扰杂波信号并从入射信号中消减，实现对杂波干扰的有效抑制，可以广泛的应用于执法、救援及反恐等各领域.结果表明，与平均消去、子空间杂波抑制技术对比，在不同噪声环境下，本方法均能够有效的抑制干扰，图像改善因子分别提高了1~6dB，目标成像效果得到大幅度改善.

The Clutter Mitigation Based on Delay Lock Loop Tracking-and-Cancellation Method in Through-the-Wall Imaging

In through-the-wall imaging (TWI),the target image is often buried in the reflections of the wall and other clutter waves,and the target image cannot be obtained.The subspace technique has an impact on the target information when the clutter is suppressed.This paper presents the delay lock loop tracking-and-subtraction method to mitigate the clutter in TWI,and the time delay of the wall echo and direct wave is estimated and eliminated.It is widely used in the disaster rescue,hostage rescue,and city street battle.The results,compared with the average elimination method and subspace method,show that the proposed method can effectively suppress the clutter.The improvement factor (IF) of the target image is enhanced and the excellent target image is obtained.