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Multi-GNSS precise point positioning with predicted orbits and clocks
GPS Solutions ( IF 4.5 ) Pub Date : 2023-07-05 , DOI: 10.1007/s10291-023-01499-1
Longjiang Tang , Jungang Wang , Bobin Cui , Huizhong Zhu , Maorong Ge , Harald Schuh

Global Navigation Satellite Systems (GNSS) Real-time Precise Point Positioning (RT-PPP) strongly relies on the precise satellite orbits and clocks, especially the latter requires high update rate, e.g., five seconds, due to its limited prediction accuracy. Such a high-rate update frequency is a burden to both the data analysis and communicating, and interruption in communicating is almost unavoidable. For the new constellations such as Galileo and BDS-3 with high-stability hydrogen clocks onboard, it is possible to predict satellite clocks to a longer arc. Moreover, recent developments in multi-GNSS ultra-rapid precise orbit determination enables the half-hourly update, ensuring the availability with a prediction arc of 30–60 min. We investigate multi-GNSS RT-PPP using half-hourly predicted products and demonstrate that a 3-D accuracy of 2.9 and 11.3 cm can be achieved for static and simulated kinematic solutions, respectively. We present the different clock prediction accuracies of different types of satellites and propose a satellite-specific weighting strategy in PPP, which exploits the benefits of the satellites of good performance. The method is based on the prediction accuracy of both, satellites and clocks, and shows an improvement of 15 to 60% compared to those without satellite-specific weighting or with simplified weighting strategies. We also demonstrate that Galileo satellites contribute the most in the quad-constellation solution, thanks to the highly stable satellite clocks.



中文翻译:

具有预测轨道和时钟的多 GNSS 精确单点定位

全球导航卫星系统(GNSS)实时精密单点定位(RT-PPP)强烈依赖于精确的卫星轨道和时钟,尤其是后者由于其有限的预测精度而需要较高的更新率,例如5秒。如此高的更新频率对数据分析和通信都是一种负担,通信中断几乎是不可避免的。对于伽利略、北斗三号等搭载高稳定性氢钟的新星座,可以将卫星时钟预测到更长的弧度。此外,近期多GNSS超快速精密定轨技术的发展,实现了半小时更新一次,保证了30-60分钟预测弧的可用性。我们使用每半小时预测一次的产品研究多 GNSS RT-PPP,并证明 3-D 精度为 2。对于静态和模拟运动解决方案,分别可以实现 9 和 11.3 厘米。我们提出了不同类型卫星的不同时钟预测精度,并在 PPP 中提出了一种针对卫星的加权策略,该策略充分利用了卫星性能良好的优势。该方法基于卫星和时钟的预测精度,与没有卫星特定加权或简化加权策略的方法相比,提高了 15% 至 60%。我们还证明,由于卫星时钟高度稳定,伽利略卫星在四星座解决方案中贡献最大。我们提出了不同类型卫星的不同时钟预测精度,并在 PPP 中提出了一种针对卫星的加权策略,该策略充分利用了卫星性能良好的优势。该方法基于卫星和时钟的预测精度,与没有卫星特定加权或简化加权策略的方法相比,提高了 15% 至 60%。我们还证明,由于卫星时钟高度稳定,伽利略卫星在四星座解决方案中贡献最大。我们提出了不同类型卫星的不同时钟预测精度,并在 PPP 中提出了一种针对卫星的加权策略,该策略充分利用了卫星性能良好的优势。该方法基于卫星和时钟的预测精度,与没有卫星特定加权或简化加权策略的方法相比,提高了 15% 至 60%。我们还证明,由于卫星时钟高度稳定,伽利略卫星在四星座解决方案中贡献最大。与没有特定卫星加权或采用简化加权策略的方法相比,性能提高了 15% 至 60%。我们还证明,由于卫星时钟高度稳定,伽利略卫星在四星座解决方案中贡献最大。与没有特定卫星加权或采用简化加权策略的方法相比,性能提高了 15% 至 60%。我们还证明,由于卫星时钟高度稳定,伽利略卫星在四星座解决方案中贡献最大。

更新日期:2023-07-06
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