77 GHz近程雷达CFAR算法研究  

Algorithm Study of CFAR for 77 GHz Short Range Radar

作　　者：杨威[1] 崔恒荣 YANG Wei;CUI Hengrong(Donghua University,Shanghai 201620,China)

机构地区：[1]东华大学,上海201620

出　　处：《通信技术》2021年第9期2125-2131,共7页Communications Technology

摘　　要：目前恒虚警(Constant False-Alarm Rate,CFAR)技术的研究主要使用仿真分析的方法,在实测数据的基础上改善CFAR检测算法的研究较少。针对此情况,研究了调频连续波(Frequency Modulated Continuous Wave,FMCW)雷达实测的回波信号,并进行泄露信号消除和相参积累等预处理。针对功率泄露存在的情况,提出一种自适应保护单元数目的自适应保护单元数的单元平均恒虚警(Protect Cell Average-CFAR,PCA-CFAR)算法,算法中的保护单元数目根据待测单元的信杂比大小以及功率泄露情况自适应地确定,可以对功率泄漏较明显的目标实现有效检测。测试结果表明,对于大信杂比目标,PCA-CFAR算法的检测概率可以提高71%,并对远距离弱信号同样有效,为CFAR算法的工程实现提供了较大借鉴价值。At present,the research of CFAR mainly uses simulation analysis,and there are few researches on improving the CFAR detection algorithm on the basis of measured data.In view of this situation,the echo signal measured by FMCW radar is studied,and preprocessing such as leakage signal elimination and coherent accumulation are performed.Due to the existence of power leakage,a PCA-CFAR algorithm with an adaptive number of protection units is proposed.The number of protection units in the algorithm is adaptively determined according to the signal-to-noise ratio of the unit under test and the power leakage situation,which can effectively detect targets with obvious power leakage.The test results indicate that the detection probability of the PCA-CFAR algorithm can be increased by 71%for large signal-to-clutter ratio targets,and it is also effective for long-distance weak signals,which provides a great reference value for the engineering realization of the CFAR algorithm.

关 键 词：近程雷达 实测数据 恒虚警 目标检测 

分 类 号：TN957.51[电子电信—信号与信息处理]