Application of PPP technology in non-datum or multi-datum survey area
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摘要: 在无基准或者多基准测区建立首级控制网时,进行控制点联测将耗费大量的精力,且累积误差较大,采用精密单点定位(PPP)技术可有效解决问题．基于GrafNav软件PPP解算大量的IGS站数据和实测数据,得出PPP解平面误差小于1 cm,高程误差小于10 cm的结论,同时测段超过4 h时PPP解算误差变化较小,且时段越长解算精度稳定性越好．而多基准测区进行基准变换时,历元变换对Y方向的影响较大,基准变换的精度受测站位移变化值的影响较大．Abstract: When setting up the first-level control network without reference or multi-reference measurement area, the joint measurement of control points will consume a lot of energy, and the cumulative error is large. The precise singlepoint positioning (PPP) technology can effectively solve the problem. Based on a large number of IGS station data and measured data calculated by GrafNav software PPP, it is concluded that the plane error of PPP solution is less than 1 cm and the elevation error is less than 10 cm. At the same time, when the measurement period exceeds 4 hours, the variation of PPP solution error is small, and the longer the period, the better the stability of the solution accuracy. However, when the datum transformation is performed in the multireference measurement area, the epoch transformation has a great influence on the Y direction, and the accuracy of the reference transformation is greatly affected by the displacement variation value of the station.
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Key words:
- PPP /
- ITRF /
- datum transformation
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