基于VI_CFAR算法改进的毫米波LFMCW恒虚警算法研究

CFAR Algorithm of Millimeter Wave LFMCW Based on VI-CFAR Research

VI-CFAR结合了CA-CFAR、GO-CFAR、SO-CFAR三种算法,以实现不同背景下良好的检测性能,实现毫米波雷达多目标检测的准确性。本文在VI-CFAR的基础上改进一种新算法,即在前后滑窗均存在干扰目标时,采用删除均值(CMLD)CFAR替代SO-CFAR,同时在只有一个目标的情况下使用OS-CFAR替代CA-CFAR,很大程度上提高了VI-CFAR在毫米波雷达处于多目标环境下的鲁棒性,能够有效避免毫米波雷达漏警。并对此在均匀背景、杂波边缘背景和多目标背景中的检测性能进行了仿真分析,讨论了仿真结果的有效性,提高了毫米波雷达在多目标背景下的检测概率。

VI-CFAR combines three algorithm,CA-CFAR,GO-CFAR and SO-CFAR,to achieve high detection performance in different backgrounds.This paper proposes a new algorithm based on VI-CFAR,which uses CMLD CFAR to replace SO-CFAR when there are interference targets in both front and back sliding windows and uses OS-CFAR to replace CA-CFAR when there is a single target.The robustness of VI-CFAR when millimeter-wave radar is in multi-target environment is greatly improved.The detection performance of VI-CFAR in uniform background,clutter edge background and multi-target background is simulated and analyzed.The validity of the simulation results is verified.The effectiveness of the simulation results improves the detection probability of millimeter wave radar in multi-target background.