基于DPPM的激光雷达通信测距一体化方案

Lidar communication and ranging integrated solution based on DPPM

针对激光雷达系统建设成本高和测量精度低的问题,提出了一种基于差分脉冲位置调制(DPPM)的激光雷达通信测距一体化方案。该方案通过使用DPPM的不同脉冲时隙位置来表示通信和测距帧信息。接收机可以根据脉冲时隙位置解调出通信信号,并通过飞行时间测距模块实现测距功能。此外,为了应对回波信号的低信噪比(SNR)问题,使用脉冲累加算法对回波信号进行组帧处理以提高回波信号的SNR。最终,通过现场可编程门阵列(FPGA)搭建了该通信测距一体化系统并进行了测试。实验结果表明:该系统不仅能在300 cm的范围内实现平均测距误差为±2.04 cm的测距功能,而且还能同时达到5 Mb/s的通信速率。

To address the issues of high construction costs and low measurement accuracy in lidar systems,a lidar communication and ranging integrated solution based on differential pulse position modulation(DPPM)is proposed.This scheme uses different pulse slot positions in DPPM to represent communication and ranging frame information.The receiver can demodulate the communication signals based on the pulse slot positions and achieve ranging using a time-of-flight ranging module.Additionally,to address the issue of low signal-to-noise ratio(SNR)in echo signals,a pulse accumulation algorithm is used to frame the echo signals and improve their SNR.Finally,the integrated communication and ranging system is built by field programmable gate array(FPGA)and tested.The experimental results show that the system can not only achieve a range of 300 cm with an average ranging error of ±2.04 cm,but also achieve a communication rate of 5 Mb/s.