一种新的宽带目标识别雷达杂波抑制方法

New method for suppression of the clutter of the wideband target recognition radar

宽带雷达相邻回波间会出现越距离单元走动现象,传统杂波抑制方法不适用.针对这一情况,提出一种在频率域-多普勒域宽带雷达杂波抑制方法.在目标速度未知时,采用改进的Hough变换将目标信息提取出来,等同于完成对杂波的抑制过程;如果有目标速度的先验信息,则可以先进行运动补偿,然后提取目标信息,上述两种提取目标信息的途径避免了虑除杂波过程中对目标信号能量的损失.计算机仿真结果表明,该方法在输入信杂比为-10 dB(速度未知)或-15 dB(速度已知)的情况下仍可保持较高的识别性能,并且在输入信噪比为-5 dB时,算法依然保持稳定的性能,对噪声有较好的稳健性.

Traditional clutter suppression is inapplicable to the wideband radar due to the migration through resolution cells during coherent echoes. In this paper, a new method for clutter suppression in the frequence-doppler domain is proposed for the wideband radar. If the target velocity is acquired, it can be utilized to perform the velocity compensation and then the extraction of target information; without the target velocity, the improved Hough transform algorithm is proposed to extract target information, which is equivalent to accomplishing clutter suppression. Meanwhile, the proposed method is able to avoid the loss of target information during clutter suppression. Experimental results on simulated data demonstrate that our approach can provide a satisfying recognition performance, even though the input SCR is --10 dB（with the velocity unknown） or --15 dB （with the velocity known）. Furthermore, the algorithms are still robust to the noise even at --5 dB SNR.