基于整体最小二乘的地面激光扫描标靶球定位方法

SPHERE TARGET FIXING OF POINT CLOUD DATA BASED ON TLS

通过分析标靶球定位的最小二乘定位方法及其存在的问题,提出了一种地面激光扫描标靶球定位的整体最小二乘标靶球定位方法,并推导给出了两种整体最小二乘解算法,该方法可同时考虑系数矩阵误差的影响。利用真实数据进行验证的结果表明:整体最小二乘法比最小二乘法能够得到精度更高的解算结果,有利于提高标靶球体定位的准确度。

In terrestrial laser scanning, sphere target is an important accessory. With it, multiple point clouds data obtained form different views can be transformed into the same coordinate system frame. In order to complete the task mentioned above, determination of sphere target centre is a key. The common method to locating sphere center coordinate is least square. A new method for determining sphere target centre by total least squares is presented. On the basis of this model, the errors and the coefficient matrix can be corrected at the same time. Experiments using simulation data and real data were conducted. From the real point clouds results, it is shown that the proposed method is effective.