GNSS接收机与全站仪控制点恢复测量及精度分析

主要利用GNSS接收机与全站仪对基坑控制点进行恢复测量,GNSS接收机通过RTK技术在基坑周边重新布设5个控制点,利用全站仪假定方向推算出控制点的坐标,并且分析其相对精度。通过实地观测计算分析,推算出的坐标与基坑中心点位置X方向相差5 mm、Y方向相差4 mm,恢复后的控制点能够对其他特征点进行详细测设。利用高精度的0.5″级全站仪进行点位测量精度对比分析,点位精度在2 mm范围之内,可以得出工程单位所用的仪器可满足精度,能够用于此类工程点位测设工作。

Recovery Measurement and Accuracy Analysis of Control Points Based on GNSS Receiver and Total Station

In order to ensure the accuracy of the survey,this paper mainly uses GNSS receiver and total station to restore the survey of the control point of the foundation pit.The GNSS receiver resets 5 control points around the foundation pit by RTK technology,calculates the coordinates of the control point by the assumed direction of the total station,and analyzes its relative accuracy.Through field observation,calculation and analysis,the difference between the calculated coordinates and the center point of the foundation pit in X direction is 5 mm,and the difference in Y direction is 4 mm.The recovered control point can carry out detailed measurement and setting for other characteristic points.Using the high-precision 0.5″total station to carry out the comparison and analysis of the point measurement accuracy,the point accuracy is within 2 mm,it can be concluded that the instruments used by the engineering unit meet the accuracy,and can be used for such engineering point measurement and setting work.