数字混沌抗干扰激光雷达设计  

Design of Digital Chaos Anti-jamming Lidar

作　　者：高华政 冯丽燕 虞名海 张建勋 石梦悦 胡卫生[1] 义理林[1] GAO Hua-zheng;FENG Li-yan;YU Ming-hai;ZHANG Jian-xun;SHI Meng-yue;HU Wei-sheng;YI Li-lin(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：《光通信研究》2021年第3期6-10,共5页Study on Optical Communications

摘　　要：针对传统混沌激光雷达系统结构复杂和成本高的问题,文章提出了采用现场可编程门阵列(FPGA)和任意波形发生器(AWG)两种发射方案,基于改进的Logistic映射公式实时动态生成数字混沌信号。将在电上生成的数字信号调制到直调激光器上生成光域的混沌信号,混沌光信号作为激光雷达发射信号,进而配合光学收发系统搭建成套的激光雷达探测系统,对一个反射率为50%的待测物进行距离测量,无需复杂的光学结构即可实现厘米级别的准确测距。通过实验比较连续和二值化处理后的混沌信号测距效果,发现二值化混沌信号的测距准确度比连续混沌高一倍以上,对于不同频率下的方波、正弦波和混沌干扰信号具有更强的抗干扰能力,展现出更大的应用优势。In view of the complex structure and high cost of traditional chaotic lidar systems, this paper proposes two transmission schemes using Field Programmable Gate Array(FPGA) and Arbitrary Waveform Generator(AWG), based on the improved Logistic mapping formula to dynamically generate digital chaotic signals in real time. The digital signal generated on the electrical domain is modulated to a direct-modulated laser to generate a chaotic signal in the optical domain. Then the chaotic optical signal is used as a lidar transmission signal. Therefore, a complete lidar detection system is built on the optical transceiver system. To measure the distance of an object with a reflectivity of 50%, accurate distance measurement at the centimeter level can be achieved without complicated optical structures. We conduct experiments to compare the ranging effects of continuous and binarized chaotic signals. It is found that the ranging accuracy of binarized chaotic signals is at least doubled than that of continuous chaotic signals. For square wave, sine wave and chaotic interference signals at different frequencies, it has stronger anti-interference ability and shows greater application advantages.

关 键 词：激光雷达 数字混沌 二值化 抗干扰 

分 类 号：TN249[电子电信—物理电子学]