为了减少公路违章超速现象的发生，使交通安全监测体制更完善，设计并研制了一种可远距离工作的便携式激光多普勒测速系统.阐述了激光多普勒测速的基本原理和光束变换的实现方法，并利用双透镜类望远系统的结构搭建了用于公路超速检测的激光测速仪.理论分析与路边测试试验表明：该激光多普勒测速系统具有长工作距离和大景深的特点，并且可以较高精度获得车辆的行进速度.相比于传统激光测速仪，便携式激光多普勒测速系统提升了中心工作距离并增大了景深.新激光测速仪的中心工作距离为10 m，景深为±1 m，测速精度可以达到0.1%.

In order to reduce the illegal overspeed on highways and improve the traffic safety monitoring system, a portable laser Doppler velocity measuring system for long-distance work is proposed. The principle of laser Doppler velocimeter and the method of beam transformation are described in detail. And using the structure of the double lens telescope system, the laser velocimeter for highway overspeed detection is built. The results of theory and experiment show that this laser Doppler velocity measuring system has the characteristics of long working distance and large depth of field, and the vehicle's velocity can be obtained with high accuracy. Compared with traditional laser velocimeters, the center working distance and the depth of field are increased by this portable laser Doppler velocity measuring system. The center working distance of this novel laser Doppler velocimeter is 10 m; the depth of field is ±1 m, and the velocity measurement accuracy can reach to 0.1%.