双通道三维成像激光雷达技术研究

Research on dual-channel 3D imaging LiDAR technology

激光雷达作为一种三维测量系统,通过采集的激光测量点(点云)对测量区域实现三维测量覆盖。由于三维测量覆盖的网格密度受测距范围、激光发射频率、扫描角度和扫描频率等因素限制,单通道激光扫描难以完成高网格密度三维点云数据采集。为探索提高激光雷达扫描点云网格密度的有效途径,本文建立了激光雷达双通道扫描系统模型,分析了该模型的双通道三维测量的实现机理,设计了双通道机载激光雷达扫描演示系统。通过对比目标地物的实际扫描试验结果,验证了双通道激光雷达扫描仪的系统可行性和获得更高分辨率、更完整测量区域表面三维点云的能力。

LiDAR is widely used in three dimensional （3D） remote sensing fields, and the 3D image could be plotted by laser points which are collected with LiDAR. However, the density of laser points is usually limited by operating height, laser frequency, scanning angle and scanning frequency. In order to improve the laser points density of LiDAR, the model of laser detection was built in the paper, and the principle of LiDAR detecting was analyzed. A demonstrating dual-channel LiDAR system with two isolated laser channel was designed to validate the improvement. The experiment showed an improvement in better resolution and wider detection region.