基于微波传感器的道路拐角警示系统设计

为了减少道路拐角处交通事故发生的频率,设计了一种能够检测拐角两侧运动物体并且测量速度的警示系统.采用探测距离远、穿透性强、能够测量速度的多普勒微波传感器,产生的信号经过多级放大和滤波,采样后做快速傅立叶变换（FFT）计算出频率,进而计算出车辆和行人的速度;再通过LED显示屏发出适当的警示信号.实验结果表明：该系统探测距离超过40 m,速率检测范围达到0.5～ 73 km/h,能够有效起到警示作用,具有很高的使用价值.

Design of road corner warning system based on microwave sensor

In order to reduce traffic Accident in road corner, design a warning system which can detect and measure speed of moving object on both sides of the road corner. The Doppler microwave Sensor which has long detection distance, strong penetrability and can measure speed is chosen,and signal generated by the sensor is multi.level magnified, filtered, sampled and then used to make FFT to get its frequency, then speed of car and pedestrian is calculated, appropriate warning signal is displayed on the LED screen. The result of tests indicate that the detection distance of the syatem exceeds 40 m,range of speed detection is 0.5 -73 km/h,which has effective warning effect and high practical value.