Wide area real time kinematic decimetre positioning with multiple carrier GNSS signals
Wide area real time kinematic decimetre positioning with multiple carrier GNSS signals
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DOI：
10.1007/s11430-010-0032-0
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发表时间：
2010-05-01
影响因子：
5.7
通讯作者：
Li BoFeng
中科院分区：
文献类型：
--
作者：
Feng YanMing;Li BoFeng
本文使用多个由未来GNSS（例如现代化的GPS和Compass Systems）传输的多个载体信号为广泛实时的实时定位服务提供了技术基础。第一步是在各种观察环境中，形成两种电离层还原的外部水平（EWL），它们的周期中的总噪声水平最小，循环中的总噪声水平最小，在各种观察环境中的影响。提出的三种载波歧义分辨率方法可以决定所选EWL信号的整数歧义，并在通常数百公里的距离内分别具有无几何形状和基于几何形式的估计。使用两个歧义固定的EWL信号，可以以十分级级别的准确性来实现运动学定位溶液。采用了一种半模拟方法来生成三个频率指南针数据，以证明上述十分位定位服务的预期性能。理论和实验结果均表明，通过超过120个时期的相平滑过程获得的15 cm的总体3D均方根准确度优于15 cm。该定位结果中的主导误差因子是对流层偏置的残留偏差，随着基准生长超过数百公里，它们的相关性较小。关于基于双频率的精确点定位和宽面积差分定位解决方案，使用第三频率信号的主要优点是收敛时间从数十分钟到几分钟。另外，由于即时歧义分辨率的能力，相位断裂或周期滑动不再影响解决方案的连续性。这种可靠的十分位定位能力为生活安全，关键责任和专业应用带来了重大改进。
This paper presents the technical basis for wide area real time decimetre positioning services using multiple carrier signals transmitted by future GNSS such as modernized GPS and Compass systems. The first step is to form two ionosphere-reduced extra-widelanes (EWL) that have the minimal total noise levels in cycles, considering the effects of the ionospheric and tropospheric delays, orbital error, and phase noise terms in various observational environments. The proposed three carrier ambiguity resolution approach can determine the integer ambiguities of the selected EWL signals with geometry-free and geometrybased estimations respectively over the distances of typically hundreds of kilometres. With two ambiguity-fixed EWL signals, the kinematic positioning solutions can be achieved in decimetre level accuracy. A semi-simulation method is employed to generate three frequency Compass data to demonstrate the above expected performance for decimetre positioning services. Both theoretical and experimental results have demonstrated the overall 3D root mean square accuracy of better than 15 cm obtained through with a phase smoothing process over 120 epochs. The dominating error factor in this positioning result is the residual tropospheric biases, which would become less correlated as the baselines grow beyond hundreds of kilometres. With respect to dual-frequency based precise point positioning and wide area differential positioning solutions, a major advantage of using the third frequency signals is the convergence time being shorten from tens of minutes to a few minutes. In addition, due to the instant ambiguity resolution capability, phase breaks or cycle slips no longer affect the continuity of the solutions. This reliable decimetre positioning capability introduces a significant improvement to safety-of-life, liability-critical and professional applications.