Quantitatively Evaluating Random Attitude Measurement Errors' Impacts on DSM Elevation Accuracy From Airborne Laser Scanning
Quantitatively Evaluating Random Attitude Measurement Errors' Impacts on DSM Elevation Accuracy From Airborne Laser Scanning
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DOI：
10.1109/tim.2013.2266036
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发表时间：
2013-07
影响因子：
5.6
通讯作者：
Jianjun Wang;Lijun Xu;Xiaolu Li;Z. Quan
中科院分区：
文献类型：
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作者：
Jianjun Wang;Lijun Xu;Xiaolu Li;Z. Quan
研究了全球定位系统(GPS)/惯性测量组合(IMU)组合系统的随机姿态测量误差(RAME)对由机载激光扫描(ALS)系统重建的数字地面模型(DSM)高程精度的影响。通过数值模拟，建立了三种常见的地形模型，即平面地形模型、矩形地形模型和半球地形模型，并对这三种地形模型下ALS系统的扫描过程进行了仿真，分析了RAME对重构DSM的影响。并搭建了半物理模拟实验装置，对数值模拟结果进行了验证。扫描了一个物理地形模型，以定量评估RAME对激光点云定位精度和重建DSM高程精度的影响。实验结果表明，在实验飞行高度为1310 mm的条件下，受两种不同标准差的RAME影响，重构后的DSM高程误差均方根值分别增加0.04和1.56 mm，相当于实际飞行高度500m时的0.015和0.595 m。因此，如果要求在500m飞行高度条件下，由RAME引起的DSM高程误差小于1 cm，组合系统的随机姿态测量精度要求至少大于0.0 1°(1σ)。
Impacts of random attitude measurement errors (RAME) made by the global positioning system (GPS)/inertial measurement unit (IMU) integrated system on elevation accuracy of a digital surface model (DSM) reconstructed from an airborne laser scanning (ALS) system were evaluated. By numerical simulation, three common terrain models, i.e., a planar, a rectangular, and a hemispheric terrain model, were established, and the scanning processes of the ALS system for the three terrain models were simulated to analyze the effects of RAME on reconstructed DSMs. Furthermore, a semi-physical simulation experimental setup was constructed to verify the results obtained from the numerical simulation. A physical terrain model was scanned to quantitatively evaluate the impacts of RAME on positioning accuracy of a laser point cloud and elevation accuracy of a reconstructed DSM. Experimental results show that under the condition of experimental “flight” height of 1310 mm and affected by two kinds of RAME with different standard deviations, i.e., 0.01° and 0.1°, the RMS values of elevation error of reconstructed DSMs increase 0.04 and 1.56 mm, respectively, corresponding to 0.015 and 0.595 m at actual flight height of 500 m. Therefore, if the elevation error of a reconstructed DSM caused by RAME is requested to be lower than 1 cm under the condition of flight height of 500 m, the random attitude measurement accuracy of the GPS/IMU integrated system should be higher than 0.01° (1σ) at least.