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研究了姿态角随机测量误差对机载激光雷达激光脚点定位精度和数字表面模型(DSM)精度的影响。分析了机载激光雷达的工作原理,推导了姿态角随机测量误差与激光脚点定位误差之间的传递关系。通过数值仿真,模拟了3种地形,研究了姿态角随机测量误差对点云及DSM的影响规律。通过半实物仿真实验,定量评价了姿态角随机测量误差对激光脚点定位精度和DSM精度的影响。仿真和实验结果表明,姿态角随机测量误差造成激光脚点定位精度和DSM精度降低。姿态角随机测量误差造成激光脚点平面坐标误差增加较大,是高程误差的4~5倍;当姿态角随机测量误差增大10倍时,激光点云三维坐标误差也增大约10倍,而DSM误差则增大40倍左右。
The effect of stochastic measurement error of pose angle on the positioning accuracy of laser foot-point and the accuracy of digital surface model (DSM) of airborne lidar was studied. The working principle of airborne lidar was analyzed, and the transfer relationship between stochastic measurement error of attitude angle and positioning error of laser footing was deduced. Three kinds of terrain were simulated by numerical simulation. The influence of stochastic measurement error on point cloud and DSM was studied. Through semi-physical simulation experiments, the effects of stochastic measurement error of pose angle on the positioning accuracy and precision of DSM are quantitatively evaluated. The simulation and experimental results show that the stance accuracy of laser footing and DSM accuracy decrease due to the random measurement error of attitude angle. Attitude angle random measurement error causes laser foot plane coordinate error to increase greatly, which is 4 to 5 times of elevation error; when the attitude angle random measurement error increases 10 times, laser point cloud three-dimensional coordinate error also increases about 10 times DSM error is increased about 40 times.