基于相位偏差的实时PPP模糊度固定

Real-time Precise Point Positioning Ambiguity Resolution Based on Phase Biases

采用CNES发布的实时相位偏差数据,实现包含模糊度固定的实时精密单点定位.对全球10个IGS测站10天观测数据进行RTPPP解算,分别统计模糊度首次固定时间和定位精度,结果显示利用实时相位偏差数据能在平均30 min内实现模糊度首次固定,模糊度固定时水平位置误差由6 cm迅速降低至2 cm左右,三维位置误差由10 cm迅速降低至5cm左右,同时RTPPP模糊度固定在3h观测内可保持水平3cm、三维5cm左右的定位精度.通过分析得出,基于相位偏差的RTPPP模糊度固定技术具有较高的定位精度和定位稳定性,能够快速实现cm级定位.

The real-time phase biases products released by CNES are used to realize real-time precise point positioning with ambiguity resolution.Firstly,the timing characteristics of real-time phase biases products are analyzed,which have high continuity and stability.Then the RTPPP solution is performed on the 10-day observation data of 10 IGS stations,and the first fixed time and positioning accuracy of the ambiguity are calculated respectively.It is concluded that the real-time phase biases product can achieve the first fixed ambiguity within an average time of 30 minutes.When the ambiguity is fixed,the horizontal position error can be quickly reduced from 6 cm to 2 cm,and the three-dimensional position error can be quickly reduced from 10 cm to about 5 cm.At the same time,as the RTPPP ambiguity resolution keeps the result in 3 h measurement,the positioning accuracy is about 3 cm in 2D and 5 cm in 3D.The results show that the real-time PPP ambiguity resolution technology based on phase biases has high positioning accuracy and stability,and can realize centimeter-level positioning quickly.It can promote the application of real-time phase biases products in real-time precise point positioning.