摘要
为研究机载平台的姿态角扰动对激光雷达点云扫描区域和密度分布,以及对由激光点云重建的三维表面模型的精度影响,首先从理论上阐明了姿态角扰动对激光点云扫描区域、密度分布及重建三维表面模型精度的影响机理;其次通过数值仿真,详细分析了姿态角扰动对激光点云扫描区域和密度分布的影响规律;最后通过半实物仿真实验,模拟了真实机载激光雷达扫描过程,验证了机载平台的姿态角扰动对激光点云扫描区域和密度分布的影响,并定量评价了姿态角扰动造成的数字表面模型(DSM)的精度变化。仿真和实验结果表明,机载平台姿态角扰动造成激光点云扫描区域偏移和局部区域点云密度降低,前者导致被扫描目标地形的部分区域漏扫;后者导致由激光点云重建的DSM失真增大。因此,姿态角扰动对机载激光雷达点云的扫描区域和密度分布,及对DSM的重建精度有显著的影响,应采取有效措施对姿态角扰动进行实时抑制或补偿。
In order to analyze the impact of attitude deviations of airborne platform on the coverage area and density distribution of laser point cloud of airborne LiDAR and on the accuracy of the Digital Surface Model （DSM） recon- structed from the point cloud, the principle that attitude deviations affect the coverage area and density distribution of point cloud and the DSM accuracy is firstly described. Then, with numerical simulation, the impact of attitude devi- ations on the coverage area and density distribution of point cloud is analyzed. A semi-physical simulation experiment was carried out to simulate the process of airborne laser scanning. The impact of attitude deviations on the coverage area and density distribution of point cloud is verified, and the accuracy variation of the DSM caused by attitude de- viations is quantitatively evaluated. Simulation and experiment results show that attitude deviations may cause the coverage area shifting and the point density decreasing in some local regions of the laser point cloud; furthermore, the former results in some missed scan area of the target terrain, while the latter deteriorates the accuracy of the re- constructed DSM. Therefore, attitude deviations have significant impact on laser point cloud and the accuracy of re- constructed DSM, and should be suppressed or compensated in real-time with effective measures.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2011年第8期1810-1817,共8页
Chinese Journal of Scientific Instrument
基金
国家973计划(2009CB724001)
教育部新世纪优秀人才计划(NCET-07-0046)资助项目
关键词
机载激光雷达
误差分析
点云
数字表面模型
姿态角扰动
仿真
airborne LiDAR
error analysis
point cloud
digital surface model （DSM）
attitude deviation
simulation
