基于检定场的移动背包扫描测量系统精度评定

Accuracy evaluation for mobile backpack-mounted scanning system based on standard baseline field

移动背包扫描测量系统长期使用后对系统测量精度和可靠性产生影响,系统检校和精度评定在国内尚无规范标准。针对此问题,本文研究了移动背包扫描测量系统的性能指标和关键技术,并基于北京市标准长度基线场,构建了移动背包三维扫描测量系统检校与精度评定空间位置基准,提出了系统综合检校和精度评定方法。以徕卡移动背包扫描系统为研究对象,在北京市标准长度基线场检校基柱周边有序错落布设25个自制立体反射靶标,建立反射靶标特征点三维坐标标准值,比对靶标特征点扫描测量值与标准值,评估分析系统测量精度。试验结果表明,系统平面点位精度优于3 cm,高程精度优于2 cm,为移动背包扫描测量系统精度评定和可靠性应用提供了可靠依据。

After the long-term use,there will be the impact on the measurement accuracy and reliability of the mobile backpack-mounted scanning system,without no standard for system calibration and accuracy evaluation.The key technologies and performances indexes of backpack-mounted scanning system are studied.The comprehensive accuracy evaluation method is put forward.The homemade stereo reflection targets as feature points are distributed in an orderly way around the calibration pillars of Beijing standard length baseline field,and the comprehensive accuracy of the system is evaluated and analyzed by comparing the scanning measurement values of target characteristic points with the standard values.The experimental results show that the plane accuracy of the system is better than 3 cm and the elevation accuracy is better than 2 cm,which provides a reliable basis for the accuracy evaluation and reliability application of the backpack-mounted scanning system.