Automobile Reversing Radar (ARR) is a protection system which appeared in the condition of that the cars are scratched easily, even some of the accidents happen when drivers reverse, for the reason of that the current highway, street, parking lots and garages are getting more crowded, and the drivers are unable to see obstacles behind the vehicle because of the existence of visual blind spots, aimed at prevent a car crash when reversing. The reversing radar system, which can recognize the barrier at the back of car when the vehicles reverse at a low speed, and is capable of measuring the distance between the vehicle and obstacles, warned the drivers to brake at the way of sound and light, before the collision occurred.
The design analyzes how the ultrasonic measure distance and what the problem of the other automobile reversing radars which have appeared at home and abroad are, from the perspective of research and analysis. Then introducing the most simple and practical way at present to make the ARR, that is, the ARR based in the GM8101 chip which produced in ChengDuGuoTeng Microelectronics Company. The chip is integrated highly, can function as a whole system by only connecting to external ultrasonic sensor and power device, and does not require software programming. Meanwhile, as the research about realizing the vehicle electrical network is becoming more and more popular today, a program that the data of the ARR is transferred in a new kind of bus called as XY-CN. A modular design concept was used at the process of designing the system, it simplifies the debugging workload. Ultimately, hardware design, software design and system debugging about the ARR was completed very well.
Keywords:Automobile Reversing Radar,Ultrasonic ,GM3101,XY-CN BUS AT89S51