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首页> 外文期刊>Journal of applied geodesy >An Improved Between-Satellite Single-Difference Precise Point Positioning Model for Combined GPS/Galileo Observations
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An Improved Between-Satellite Single-Difference Precise Point Positioning Model for Combined GPS/Galileo Observations

机译：GPS /伽利略星组合观测的改进的卫星间单差精确点定位模型

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This article introduces a new model for precise point positioning (PPP), which combines dual-frequency GPS and Galileo observations. Our model is based on the between-satellite single-difference (BSSD) linear combination, which cancels out some receiver-related biases, including receiver clock error and non-zero initial phase bias of the receiver's oscillator. Two different scenarios are considered when forming BSSD linear combinations. In the first scenario, either a GPS or a Galileo satellite is selected as a reference for both GPS and Galileo observa-bles. The second scenario, on the other hand, selects two reference satellites: a GPS reference satellite for the GPS observables and a Galileo satellite for the Galileo observ-ables. Natural Resources Canada's GPSPace PPP software is modified to enable a combined GPS/Galileo PPP solution and to handle the newly introduced biases. A total of 12 data sets representing two-day GPS/Galileo measurements at six IGS stations are processed to verify the developed PPP model. Precise satellite orbit and clock products from the IGS-MGEX network are used to correct both of the GPS and Galileo measurements. It is shown that using one reference satellite to form the BSSD linear combinations improves the precision of the estimated parameters by about 25% compared with the GPS-only PPP solution. When two reference satellites are used, however, the precision of the estimated parameters improves by about 50% compared with the GPS-only PPP solution. Additionally, the solution convergence time is reduced to 10 min for both BSSD scenarios, which represents about 50% improvement in comparison with the GPS-only PPP solution.
机译：本文介绍了一种新的精确点定位（PPP）模型，该模型结合了双频GPS和伽利略观测。我们的模型基于卫星间单差（BSSD）线性组合，该组合消除了一些与接收机相关的偏置，包括接收机时钟误差和接收机振荡器的初始相位非零偏置。形成BSSD线性组合时，考虑了两种不同的情况。在第一种情况下，选择GPS或伽利略卫星作为GPS和伽利略观测站的参考。另一方面，第二种情况选择两个参考卫星：用于GPS观测值的GPS参考卫星和用于伽利略观测值的Galileo卫星。加拿大自然资源公司的GPSPace PPP软件经过修改，可以实现GPS / Galileo PPP组合解决方案并处理新引入的​​偏差。总共处理了代表6个IGS站点为期两天的GPS /伽利略测量的12个数据集，以验证开发的PPP模型。来自IGS-MGEX网络的精确卫星轨道和时钟产品可用于校正GPS和Galileo测量。结果表明，与仅GPS的PPP解决方案相比，使用一颗参考卫星来形成BS​​SD线性组合可以使估计参数的精度提高约25％。但是，当使用两个参考卫星时，与仅GPS的PPP解决方案相比，估计参数的精度提高了约50％。此外，两种BSSD方案的解决方案收敛时间都减少到10分钟，与仅GPS的PPP解决方案相比，该解决方案的收敛时间缩短了约50％。

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