激光雷达视场角的研究

在激光雷达的研究中,接收机视场角是一个非常重要的参数.作者利用一种改进的半解析Monte Carlo方法对激光雷达接收信号进行了模拟.在作者的模拟中,采用Henyey-Grenstein函数的修正公式、加入权值以及放宽判决门限等方法来增进光子的利用效率.由计算结果可以看出,不同的接收机视场角使得接收信号波形有很大的差异.通过分析,我们认为接收机视场角FOV=20～30mrad时能够获得较佳的接收信号.

Study on lidar receiver field of view

The receiver field of view is a characteristic parameter of lidar and defined by its angular coverage.When laser beam propagates in liquid medium,received signal has the relation with the receiver field of view and beam scattering.We employ a improved semi-analytic Monte-Carlo method to simulate the lidar receiver signal.In order to obtain higher simulation accuracy,we use the modified Henyey-Greenstein function to express the scattering phase function,insert weight collision coefficient of photon,and relax the critical limit in order to increase the calculation efficiency of photon.As known from the simulation results,different receiver field of view produce greatly different received signal waveform.Finally,we concluded that the optimum receiver signal can be obtain when receiver field of view is in the range of 20～30mrad.