GPS-RTK界址点测量系统性误差改正方法探讨

在GPS-RTK测量界址点时,通过点校正获取坐标转换参数会引起系统性的坐标转换残差;在测定建筑物墙角等界址点时,只能以接收机天线的外缘靠近墙角位置,使得天线中心偏离界址点的实际位置,导致界址点测量偏心差。为此,通过在测区所有已知点上检测其坐标以建立测区的坐标转换残差改正模型,并导出三种基于天线偏心改正的界址点坐标计算及其误差公式,基本消除RTK界址点测量中的系统性误差影响。实际应用表明,该方法原理简单且便于外业施测和编程实现,可提高GPS-RTK界址点测量的精度。

Analysis on correction method of system error due to boundary point measurement of GPS-RTK

At the GPS-RTK boundary point measurement,the coordinates of the conversion parameters obtained through the point calibration will cause the systematic coordinate transformation residuals. During the measurement of the building corner and other boundary points,only the outer edge of the receiver antenna can be closed to the corner position,w hich makes the antenna center deviate from actual location of the boundary point,resulting in the boundary point measurement eccentricity.T herefore,this paper builds the coordinate transformation residual model by detecting the coordinates of all know n points in the survey,and deriving three kinds of calculation of boundary point coordinates and its error equations based on antenna eccentricity correction,thus essentially eliminating the effect of systematic errors of RTK boundary point measurement.T he application of the example show s that the method is simple and convenient for field application and programming,and improves the accuracy of GPS-RT K boundary point measurement.