基于FPGA的相位式激光测距系统  

Phase laser ranging system based on FPGA

作　　者：董驰 赵宇 张翀 李孟委 Dong Chi;Zhao Yu;Zhang Chong;Li Mengwei(School of Instruments and Electronics,North University of China,Taiyuan 030051,China;Nantong Institute of Intelligent Opto-Mechatronics,North University of China,Nantong 226000,China)

机构地区：[1]中北大学仪器与电子学院,太原030051 [2]中北大学南通智能光机电研究院,南通226000

出　　处：《国外电子测量技术》2021年第8期36-40,共5页Foreign Electronic Measurement Technology

摘　　要：为了简化结构并提高精度,设计了一种基于现场可编程逻辑门阵列(FPGA)的相位式激光测距系统。系统选择相位式激光测距的方法,以FPGA为核心处理器,基于双频调制和差频测相等原理,完成了硬件和软件设计,能够实现在复杂环境下的测距功能。系统的硬件部分包括激光调制电路、光电检测电路、频率合成电路和混频电路等;软件部分包括PLL调制信号的生成、控制激光发射与接收模块和距离分析解算等。该系统通过比较接收激光和发射激光的相位差并进行距离解算进而实现整个测距流程,由实验测得的波形分析,整个测距系统量程可达60 m,精度在毫米范围内。该系统稳定性好,简化了电路设计的复杂度,成本低和集成度高等优势明显。In order to simplify the structure and improve the accuracy, this paper designs a phase laser ranging system based on FPGA. The system chooses the method of phase laser ranging, with the FPGA as the core processor, and completes the hardware and software design based on the principle of dual frequency modulation and difference frequency measurement, which can realize the ranging function in complex environment. The hardware of the system includes the laser modulation circuit, photoelectric detection circuit, frequency synthesis circuit and mixing circuit. The software design includes the generation of PLL modulation signal, the control of laser transmitting and receiving module and the distance analysis and calculation. By comparing the phase difference between the received laser and the emitted laser and calculating the distance, the whole ranging process can be realized. By analyzing the waveform measured by the experiment, the range of the whole ranging system can reach 60 m, and the accuracy is within mm. The system has the advantages of good stability, simplified complexity of circuit design, low cost and high integration.

关 键 词：相位 激光测距 FPGA 

分 类 号：TN249[电子电信—物理电子学]