基于毫米波雷达的汽车近程防撞系统设计

Design for automotive short-rangecollision avoidance system based on millimeter wave radar

采用24GHzmm波雷达传感器,设计了一种汽车近程测距与防撞系统。系统通过对运动物体上载有的雷达射频前端输出信号的处理,可以得到该传感器与目标物体的距离和速度信息,根据此信息来判断载有该传感器的物体与目标物体是否有碰撞危险。若有危险,则通过声音报警提醒运动物体如汽车驾驶者,以减小事故发生的概率。该设计首先对雷达射频前端输出的差频信号进行滤波和输入匹配,然后用STM32F407处理器来完成实时测距和测速算法。经实验验证,该系统工作稳定,测量距离可达20m,可将其应用到倒车雷达和盲点检测中,弥补了当前防撞雷达探测距离短的缺点。

In this paper, a 24 GHz millimeter wave radar sensor is used to design a short range distance measurement and collision avoidance system. The system can get the distance and velocity information of the sensormounted on the moving object and the target object by processing the output signal of the radar. Then judge whether there is a collision risk between the object and the target object based on this information. If there is a danger, anaudio alarm is used to remind a moving object, such as a motorist,to reduce the probability of an accident. In this design, we first filter and match the difference frequency signal output from the radar, then use the STM32 F407 processor to complete the real-time ranging and velocity measurement algorithm. Experimental results show that the system works stably, and the measurement distance can reach 20 meters. It can be applied to reversing radar and blind spot detection, making up for the shortcoming of the current anti-collision radar’s short detection distance.