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1.前言利用空间滤波器测定车速的方法是,通过观察路面的光学波动,从所得到的不规则信号中选滤出必要的信息来测定车速的。它利用一定间隔排列的缝隙屏所产生的频率,作用到一种窄频带空间滤波器上测定车速。因此,车速的测定便可归结为窄频带随机信号中心频率的测定。定量地剖析缝隙屏的这种性质,在速度测试系统的设计中是十分重要的。内藤等人研究了输出功率谱和密度函数,在空间频率范围内剖析了
1. Preface The method of using the spatial filter to measure the speed of a vehicle is to determine the speed of the vehicle by filtering out the necessary information from the resulting irregular signal by observing the optical fluctuations of the road surface. It uses a certain interval of frequency generated by the slit screen, acting on a narrowband spatial filter to measure the speed. Therefore, the determination of speed can be attributed to the narrow-band random signal center frequency measurement. Quantitative analysis of the nature of slit screens is of great importance in the design of speed test systems. Naito et al. Studied the output power spectrum and density function and analyzed them in the spatial frequency range