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直升机载荷平台6-D(Six-Dimensional)运动误差(即飞行轨迹和姿态角运动误差)对机载LiDAR点云质量影响显著,进而影响三维重建模型精度。分析各运动误差对点云质量的影响特点,对于有针对性地消除各运动误差影响、有效提高机载LiDAR三维成像产品精度具有重要意义。建立了机载激光扫描脚点三维空间位置偏差与机载平台六方位运动误差之间的传递关系;采用数值仿真,定量比较了六方位运动误差对激光点云密度分布和的影响,获得了六方位运动误差的影响特点及规律。仿真结果表明,直升机载荷平台的三个姿态角运动误差对点云密度的影响更显著,且随飞行高度的增大而增大,而三个飞行轨迹运动误差的影响相对较小。
The 6-D (Six-Dimensional) motion error of helicopter load platform (ie, trajectory and attitude angular error) has a significant impact on the airborne LiDAR point cloud quality, thus affecting the accuracy of the 3D reconstruction model. Analyzing the characteristics of the impact of motion errors on the quality of point clouds is of great significance for the targeted elimination of the effects of motion errors and the improvement of the accuracy of the airborne LiDAR 3D imaging products. The relationship between the three-dimensional spatial position deviation of airborne laser scanning footing and the six-position motion error of airborne platform was established. The numerical simulation was used to quantitatively compare the influence of six-position motion error on the density distribution of laser spot. Influence Characteristics and Rules of Azimuth Motion Error. The simulation results show that the three attitude angular errors of helicopter load platform have a more significant effect on the point cloud density, and increase with the increase of flight altitude, while the influence of the motion errors of the three flight paths is relatively small.