本设计是基于单片机的汽车倒车雷达系统，主要是利用超声波的特点和优势，将超声波测距系统和AT89C51单片机结合于一体，设计出一种基于AT89C51单片机的倒车防撞系统。-This design is based on the single chip car parking sensor system is mainly features and advantages of using ultrasound, the AT89C51 microcontroller ultrasonic rangi

【摘要】 倒车雷达是汽车泊车或者倒车时的安全辅助装置，能以声音或者更为直观的显示告知驾驶员周围障碍物的情况，解除了驾驶员泊车、倒车和起动车辆时前后左右探视所引起的困扰，并帮助驾驶员扫除了视野死角和视线模糊的缺陷，提高驾驶的安全性。本设计利用ATMEL公司的AT89C51单片机、超声波传感器测距实现超声波倒车雷达。利用LED和发光二极管表示传感器探测范围内是否有障碍物，当在探测范围内有障碍物时，发光管以一定频率闪烁，闪烁的频率以距离定，距离越近频率越高。同时蜂鸣器提示报警，探测并指明障碍

Autonomous vehicles are defined as vehicle that get one point to another point without human interaction & implement a number of well placed sensors that detect different things such as other vehicles, people, traffic lights, and movement of other ve