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公路系统常用雷达测量车辆的速度,通过对超速车辆的处罚降低了事故发生率,保障了人民群众生命安全.那么,雷达测速的基本原理是什么呢?它涉及电磁波的多普勒效应、拍现象等物理知识,现分述如下:一、电磁波的多普勒效应多普勒效应是波动的基本特性.根据狭义相对论,如果有一电磁波源以相对速度 v 朝着观测者做匀速直线运动,此电磁波源在运动中连续不断地发出频率为 f_0的微波脉冲,则观测者收到此脉冲波的频率为 f=f_0(c+v)/(c-v)~(1/2),其中 c 为电磁波在
Highway systems commonly used radar measurement of vehicle speed, through the punishment of speeding vehicles to reduce the incidence of accidents and protect the safety of people’s lives. So, the basic principle of radar speed? It involves the Doppler effect of electromagnetic waves, shot phenomenon Doppler effect is the basic characteristics of fluctuations.According to the special theory of relativity, if there is an electromagnetic wave source to the observer at a relative velocity v constant linear motion, the electromagnetic wave The source continuously emits a microwave pulse of frequency f_0 during motion, then the frequency of the pulse wave received by the observer is f = f_0 (c + v) / (cv) ~ (1/2), where c is the frequency of the electromagnetic wave in