中文摘要：

机载Li DAR中的一些工作参数既有控制误差,又有测量误差,如机载平台的飞行轨迹、姿态角和激光扫描仪的扫描角等,两种误差均会造成点云产品质量降低。为分析两种误差对点云产品精度的影响机理,从理论上分析了两种误差对点云和数字表面模型（DSM）精度的影响,通过数值仿真,模拟了机载Li DAR的测量过程,以机载平台姿态角参数为例,定量评价及比较了姿态角的控制误差和测量误差对点云分布及DSM精度的影响大小。结果表明,机载Li DAR的测量精度取决于这两种误差的影响,其中控制误差主要造成点云分布区域及密度改变,继而导致DSM失真增大,而测量误差造成点云定位精度和重建DSM精度降低。因此,需采取措施分别对两种误差进行抑制补偿。

英文摘要：

In airborne Li DAR, some working parameters have both control errors and measurement errors,such as attitude angles, flight trajectories, and scan angle of laser scanner. Both kinds of errors can deteriorate qualities of point cloud products. In order to find out compensation measures to improve accuracies of point cloud and the reconstructed digital surface model（DSM）, impacts of the two kinds of errors are analyzed theoretically. Then, through numerical simulation, the working process of airborne Li DAR is simulated. The two kinds of errors of attitude angle parameters are taken as an example, and effects of attitude control errors and measurement errors on accuracies of point cloud products are quantitatively evaluated and compared.Simulation results show that, the qualities of point cloud products from airborne Li DAR depend on common impacts of the control errors and measurement errors. The control errors mainly cause varying of point density and distribution area of point cloud, resulting in decreasing of spatial sampling resolution of point cloud, the measurement errors mainly cause decreasing of positioning accuracy of point cloud. Both errors can add distortion to the reconstructed DSM. Therefore, it is necessary to take appropriate measures to compensate the impacts of the two kinds of errors, respectively.