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现代公路交通时有车祸发生,究其肇祸原因,往往是车速过快所致.因此,交通民警很需要监测来往汽车的速度,以防违章超速行驶.这样,车辆测速雷达便应运而生. 本测速雷达是依据多普勒效应工作的.众所周知,无线电波、微波、光波等在其传播的路径上遇到运动物体而被反射回来时,必会产生“多普勒效应”,只是人们的感觉器官无法觉察其回波频率的变化,而需要借助多普勒传感和放大、显示设备来检测.这就构成了多普勒测速雷达.
Therefore, it is very necessary for traffic police to monitor the speed of traffic between vehicles in order to prevent illegal speeding. In this way, vehicle speed radar will emerge as the times require. Speed radar is based on the Doppler effect of work.As we all know, radio waves, microwaves, light waves in the path of its propagation encountered moving objects and be reflected back, it will have a “Doppler effect”, but people’s feelings The organ can not detect the change of the echo frequency, but need to use Doppler sensing and amplification, display equipment to detect .This constitutes a Doppler velocimetry radar.