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 mi