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以国产机载激光扫描仪内较独特的扫描四棱塔镜为基础,提出了四棱镜的误差模型,并分别建立了垂直与水平方向的定位误差模型,依据该模型定性定量分析了对定位精度的影响,研究表明,四棱塔镜误差在垂直与水平方向对定位精度的影响趋势不同,均与扫描角有关,并随测距值的增大而增大。其中,垂直误差在X方向对定位精度的影响远远大于Y、Z方向。水平误差在Y方向影响呈抛物线趋势,Z方向与横滚角的影响相似。由分析可知,四棱塔镜误差对定位精度的影响较大,必须在转镜设计及加工、主机系统装调及部件集成优化、主机系统检校三个环节严格控制以消除或削弱此误差,研究该误差对机载激光雷达系统定位精度的提高有着重要影响。
Based on the unique scanning quadrilateral mirror in the domestic airborne laser scanner, the error model of quadrupole was proposed and the vertical and horizontal positioning error models were established. According to the model, qualitative and quantitative analysis of the positioning accuracy The research shows that the influence of quadrilateral mirror errors on the positioning accuracy in vertical and horizontal directions are different, which are all related to the scan angle and increase with the increase of distance measurement. Among them, the vertical error in the X direction of the positioning accuracy is much greater than the Y, Z direction. The horizontal error has a parabolic trend in the Y direction, and the Z direction has a similar effect as the roll angle. According to the analysis, the error of the quadrangular pyramid mirror has a great influence on the positioning accuracy. Therefore, it is necessary to strictly control the rotation mirror design and processing, the host system assembly tuning and component integration optimization, and the host system calibration to eliminate or weaken the error. Studying the error has an important influence on the improvement of positioning accuracy of airborne lidar system.