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本专利详细叙述了一个探测运动目标并测量目标速度的光雷达系统。在一般的电磁探测系统中,装置选取运动目标并测定目标速度都是基于探测接收信号和发射信号之间的频率差,由于目标相对于雷达有位移,故利用“多普勒”效应来实现,这就是多普勒雷达。这种工作在高频或微波段的雷达的缺点是目标定位和测速精度受到限制,例如测速精度是10％数量级,角分辨率是1°数量级。若使用相干光源(如激光器)作为发射源,则可大大增加发射束的锐度和雷达的工作频率,从而明显地改进了测量精度。
This patent details a light radar system that detects moving targets and measures the target speed. In a general electromagnetic detection system, the device selects the moving target and determines the target speed based on detecting the frequency difference between the received signal and the transmitted signal. Because the target has a displacement with respect to the radar, the “Doppler” effect is used to achieve this. This is Doppler radar. The disadvantage of this type of radar operating in the high frequency or microwave range is the limited positioning and speed accuracy of the target, for example, the speed accuracy is on the order of 10% and the angular resolution is on the order of 1 °. If a coherent light source, such as a laser, is used as the emitter, the sharpness of the transmitted beam and the operating frequency of the radar can be greatly increased, thereby significantly improving the measurement accuracy.