该系统由霍尔速度传感器、微波雷达测距传感器、雨滴感应器、雨量传感器、报警装置等模块组成，采用52单片机和DSP作为数据处理单元。汽车的制动距离受路面附着系数和车速的影响，因此用测速传感器和雨量传感器来测速和确定路面附着系数进而确定汽车的制动距离。用测距传感器测得的跟车距离与制动距离相比较进而判断汽车行驶时是否存在安全隐患。雨量传感器和测距传感器不需要在汽车的任何行驶条件下一直保持工作状态，因此该系统采用两个单片机将各传感器分隔在两个子系统中，第一个单片机根据雨滴信号和速度信号通过继电器来控制测距雷达和雨量传感器电源的通断。采用两个子系统可以减少系统发热和降低功耗。(The system is composed of Holzer speed sensor, microwave radar ranging sensor, rain drop sensor, rain sensor, alarm device and so on. The 52 microcontroller and DSP are used as data processing units. The braking distance of the vehicle is affected by the coefficient of road adhesion and the speed of the vehicle. Therefore, the speed sensor and the rain sensor are used to speed up and determine the coefficient of road adhesion, and then determine the braking distance of the vehicle. The distance measured with the distance sensor is compared with the braking distance, so as to judge whether there is any hidden danger when the vehicle is running. The rainfall sensor and ranging sensor does not need to keep working in any driving condition of the vehicle, so the system uses two microcontroller to each sensor and separated into two subsystems, the first single-chip based on Raindrop signal and speed signal through the relay to control measure)