Analysis of interference suppression in single photon lidar

Abstract

LiDAR has become a key technology for autonomous driving. However, with the popularization of LiDAR, the laser signals emitted by multiple LiDAR at the same time in road environment will cause mutual interference, also known as crosstalk. Overcoming crosstalk has been a challenge that must be faced. Firstly, this paper analyzes the photon arrival time histogram characteristics of Time-Correlated Single Photon Counting LiDAR in the case of crosstalk. Then, the basic principle of interference suppression methods based on Pseudo-Random Pulse Position Modulation is introduced. Finally, we use interference suppression ratios to analyze the interference suppression effectiveness under different cumulative cycles and different random dynamic ranges. The simulation results show that when the laser repetition rates of the two LiDAR are the same, the larger the cumulative cycle number, the greater the interference suppression ratio; With the same cumulative number of cycles, the larger the random dynamic range of pulse position modulation, the greater the interference suppression ratio.