基于毫米波雷达的汽车前防撞预警系统设计

Design of Vehicle Forward Collision Warning System Based on Millimeter Wave Radar

为研究毫米波雷达用于汽车前向防撞探测的可行性,设计了一种基于77 GHz毫米波雷达传感器的汽车前向防撞探测系统装置。该装置针对低频漏波信号和高频干扰信号,采用模拟信号处理模块等硬件系统进行初步滤除,并在此基础上依次通过FIR数字滤波、FFT变换、恒虚警检测等数字算法的处理,实现了目标距离、速度等信息的探测。同时,针对结构化道路的汽车前碰撞工况,构建了基于毫米波雷达方位角探测原理和行车安全距离模型的前防撞多级预警模型。场地道路测试表明:所设计的探测装置对静态目标距离探测误差为4.5%,对同时探测两个动态目标的速度的最大误差为5%。77 GHz毫米波雷达传感器应用于汽车前防撞预警系统设计具有可行性。

In order to study the feasibility of millimeter wave radar for vehicle forward collision avoidance detection,a forward collision avoidance device was designed based on 77 GHz millimeter wave radar.Aiming at the low frequency leakage wave signal and high frequency interference signal,the device used analog signal processing module and other hardware systems for preliminary filtering.On this basis,the distance and speed of the target were obtained through the processing of FIR digital filtering,FFT transform,constant false alarm detection and other digital algorithms.At the same time,a multi-stage pre-warning model and method was constructed based on millimeter wave radar azimuth detection principle and driving safety distance model for the forward collision condition of passenger cars on structured roads.Road test showed that the distance detection error of the device designed for static target was 4.5%,and the maximum error was 5%for detecting two dynamic targets at the same time.Therefore,it was feasible for 77 GHz millimeter wave radar to be used in the design of vehicle anti-collision warning system.