结合机械振动原理方程分析计算了不同结构参数下的3自由度的1/4汽车结构的振动响应理论曲线及振动频谱图；运用激光外差技术测量原理设计搭建了汽车振动信息实验测量方案；针对外形近似、发动机输出信息相同的情况，采用视频成像法对存在识别盲点的两车进行了振动信息采集实验。通过分析采集到的振动信号的时域、频谱曲线，成功地找到了甲乙两车频谱的标志特征点，很好地对两车进行了标志与区分，弥补了视频成像车型识别法的盲点，为基于激光检测汽车振动信号的车辆识别技术提供了理论和实验基础依据。

Combinating of mechanical vibration theory equations, preliminarily the theoretical vibration response curve of structure of the quarter of 3° freedom car body with different parameters is analyzed. Using laser heterodyne techniques, an experimental measurement program for vehicle vibration information is designed and built. Against the case that two vehicles of similar appearance, engine output consistent, the vibration information and time domain vibration spectral analysis are experimentally measured. By analyzing the vibration signal time domain, and frequency spectral curves measured, the frequency feature points of the two vehicles are found successfully. The two cars are marked and distincted well, and the blind of video imaging vehicle models identification method is made up.The relevant work provides a preliminary theoretical and experimental basis for the vehicle identification technology based on laser detecting the vibration signals.