基于FPGA电控的二维快速光束扫描雷达系统  

Two-Dimensional Fast Beam Scanning Lidar System Based on FPGA Control

作　　者：邱高峰 吴侃[1] 曹先益 蔡明璐 陈建平[1] Qiu Gaofeng;Wu Kan;Cao Xianyi;Cai Minglu;Chen Jianping(State Key Laboratory of Advanced Optical Communication Systems and Networks,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学区域光纤通信网与新型光通信系统国家重点实验室,上海200240

出　　处：《光学学报》2021年第11期11-18,共8页Acta Optica Sinica

基　　金：国家自然科学基金(61922056,61875122,61535006)。

摘　　要：提出一种基于现场可编程逻辑门阵列(FPGA)电控实现快速扫描的透镜辅助的二维光束扫描和测距装置。利用二叉树结构的马赫-曾德尔干涉仪(MZI)光开关,结合FPGA逐级切换和脉冲宽度调制(PWM)技术,实现了具有16个自由切换扫描角度、19.5 m测距距离和2 cm测距误差的激光雷达原理系统。这项工作展现了FPGA电控在透镜辅助光束扫描技术中的高效控制方式,选取的电控方案对N路光束发射(即N个光束扫描角度)只需要log N路PWM波形输出。相比于典型的光相控阵(OPA)技术中N路光束发射需要N个数模转换器(DAC)的电控方案,即控制复杂度为O(N),本方案极大地降低了控制复杂度(O(log N))和系统成本,因此有望对基于集成光束扫描技术的激光雷达系统的真正应用提供参考。This paper proposed a lens assisted two-dimensional beam scanning and ranging device based on the control of field programmable gate array(FPGA).A lidar system with 16 scanning angles,19.5 m ranging distance,and 2 cm ranging error was achieved through the Mach-Zehnder interferometer(MZI)optical switches with a binary tree structure,FPGA control,and pulse width modulation(PWM).Our work shows the potential of efficient FPGA control in the lens assisted beam scanning technology.The control scheme selected in this paper only needs log N channels of PWM waveforms for N optical transmitting ports(N beam scanning angles).Compared with the typical optical phased array(OPA)technology that needs N channels of digital-to-analog converter(DAC)for N optical transmitting ports(the control complexity is O(N)),this scheme greatly reduces the control complexity(O(log N))and system cost.Therefore,it is expected to pave the way towards the application of lidar systems based on integrated beam scanning technology.

关 键 词：激光雷达 现场可编程逻辑门阵列 透镜 光开关 二维扫描 

分 类 号：P215[天文地球—测绘科学与技术]