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 ranging system and combining into one, to design a collision based on AT89C51 microcontroller backup system.