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Real-Time PPP Based on the Coupling Estimation of Clock Bias and Orbit Error with Broadcast Ephemeris

机译：基于时钟偏差和广播星历的轨道误差耦合估计的实时PPP

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Satellite orbit error and clock bias are the keys to precise point positioning (PPP). The traditional PPP algorithm requires precise satellite products based on worldwide permanent reference stations. Such an algorithm requires considerable work and hardly achieves real-time performance. However, real-time positioning service will be the dominant mode in the future. IGS is providing such an operational service (RTS) and there are also commercial systems like Trimble RTX in operation. On the basis of the regional Continuous Operational Reference System (CORS), a real-time PPP algorithm is proposed to apply the coupling estimation of clock bias and orbit error. The projection of orbit error onto the satellite-receiver range has the same effects on positioning accuracy with clock bias. Therefore, in satellite clock estimation, part of the orbit error can be absorbed by the clock bias and the effects of residual orbit error on positioning accuracy can be weakened by the evenly distributed satellite geometry. In consideration of the simple structure of pseudorange equations and the high precision of carrier-phase equations, the clock bias estimation method coupled with orbit error is also improved. Rovers obtain PPP results by receiving broadcast ephemeris and real-time satellite clock bias coupled with orbit error. By applying the proposed algorithm, the precise orbit products provided by GNSS analysis centers are rendered no longer necessary. On the basis of previous theoretical analysis, a real-time PPP system was developed. Some experiments were then designed to verify this algorithm. Experimental results show that the newly proposed approach performs better than the traditional PPP based on International GNSS Service (IGS) real-time products. The positioning accuracies of the rovers inside and outside the network are improved by 38.8% and 36.1%, respectively. The PPP convergence speeds are improved by up to 61.4% and 65.9%. The new approach can change the traditional PPP mode because of its advantages of independence, high positioning precision, and real-time performance. It could be an alternative solution for regional positioning service before global PPP service comes into operation.
机译：卫星轨道误差和时钟偏差是精确点定位（PPP）的关键。传统的PPP算法需要基于全球永久参考站的精确卫星产品。这样的算法需要大量的工作并且几乎不能实现实时性能。但是，实时定位服务将成为未来的主导模式。 IGS正在提供这样的运营服务（RTS），并且还有诸如Trimble RTX之类的商业系统正在运营。在区域连续运行参考系统（CORS）的基础上，提出了一种实时PPP算法，应用于时钟偏差和轨道误差的耦合估计。轨道误差在卫星接收机范围上的投影对具有时钟偏置的定位精度具有相同的影响。因此，在卫星时钟估计中，部分轨道误差可以被时钟偏差吸收，并且剩余轨道误差对定位精度的影响可以通过均匀分布的卫星几何形状而减弱。考虑到伪距方程的简单结构和载波相位方程的高精度，结合轨道误差的时钟偏差估计方法也得到了改进。流浪者通过接收广播星历和实时卫星时钟偏差以及轨道误差来获得PPP结果。通过应用所提出的算法，不再需要由GNSS分析中心提供的精确轨道产品。在先前的理论分析的基础上，开发了实时PPP系统。然后设计了一些实验来验证该算法。实验结果表明，新提出的方法比基于国际GNSS服务（IGS）实时产品的传统PPP性能更好。网络内部和外部流动车的定位精度分别提高了38.8％和36.1％。 PPP的收敛速度分别提高了61.4％和65.9％。新方法具有独立性，高定位精度和实时性能的优点，因此可以改变传统的PPP模式。在全球PPP服务投入运营之前，它可能是区域定位服务的替代解决方案。

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