Trimble MX7移动测量系统精度影响因素分析

Analysis of Trimble MX7 Mobile Measurement System Accuracy Influencing Factors

车载移动测量系统的测图精度受测量环境影响较大,而城市测量的环境一般较复杂,且环境对测量精度的影响程度并未明确,因此本文主要针对车辆在建筑物遮挡和拐弯两种情况下做了实验,同时对同一目标点的二维坐标和三维坐标进行了平面精度的对比,综合分析评价了Trimble MX7移动测量系统在实际应用中行驶轨迹精度和目标点位精度的变化情况。实验证明,轨迹拐弯处的点位精度比车辆直行时的点位精度差,但满足1∶1 000数字测图精度要求,在建筑遮挡最密集时点位精度最差但仍可应用于1∶1 000野外数字测图,直接对目标点的三维坐标进行提取的精度优于二维坐标提取方式,该测量系统可应用于1∶2 000野外数字测图的高程测量。

The measurement accuracy of the on-board mobile measurement system is greatly affected by the measurement environment,while the urban measurement environment is generally complex,and the impact of the environment on the measurement accuracy is not clear.Therefore,this paper mainly focuses on the vehicle in the two cases of building occlusion and turning.At the same time,the planar accuracy of two-dimensional and three-dimensional coordinates of the same target was compared.The changes of the trajectory accuracy and the accuracy of the target point in the Trimble MX7 mobile measurement system were analyzed and evaluated comprehensively.The experiment of mobile measurement system in vehicle shows that the accuracy of the point at the curve corner is worse than that of the straight line when the vehicle is straight but meets the precision of 1∶1 000 digital mapping.The point precision is the worst when the building block is the most dense,but can still be used in 1∶1 000 field digital mapping.The direct extraction of the three-dimensional coordinates of the target point is superior to the two-dimensional coordinate extraction method.The measurement system can be used in the elevation measurement of 1∶2 000 field digital mapping.