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建立了激光雷达探测运动目标转动结构微多普勒效应的数学模型,利用这套波长为1 550 nm的激光相干雷达探测系统,展开了应用激光微多普勒效应探测运动目标的实验研究和转动特征提取的方法研究。对目标的转动部分(如直升飞机的旋转叶片)不同运动状态进行了实验研究,采用频域分析和时频分析相结合的方法,对目标仅有转动部分运动和整体平动加转动的复合运动两种情况进行了实验对比,提取了运动特征,并成功估计出了运动参数,为目标识别提供了新的方法。从实验与分析可以看出该系统探测运动目标微多普勒信息的有效性和实用性,利用激光微多普勒效应和时频分析方法可以有效地揭示运动目标的运动特征,为目标探测、分类和识别提供了重要的信息。
A mathematical model of lidar’s micro-Doppler effect for detecting the rotating structure of the moving target was set up. By using this laser coherent radar system with a wavelength of 1 550 nm, the experimental research and rotation of the moving target using laser micro-Doppler Research on Methods of Feature Extraction. The rotating parts of the target (such as the helicopter’s rotating blades) are studied in different motion states. The frequency domain analysis and the time-frequency analysis are used to analyze the motion of the target with only the rotation part and the translation and rotation of the whole body The experiments were compared and the motion characteristics were extracted. The motion parameters were successfully estimated, which provided a new method for target recognition. From experiments and analysis, it can be seen that the system is effective and practicable for detecting micro-Doppler information of moving targets. The laser micro-Doppler effect and time-frequency analysis method can effectively reveal the moving characteristics of moving targets, Classification and identification provide important information.