A statistical characterization of the Galileo-to-GPS inter-system bias
A statistical characterization of the Galileo-to-GPS inter-system bias
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DOI：
10.1007/s00190-016-0925-6
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发表时间：
2016-11-01
影响因子：
4.4
通讯作者：
Borio, Daniele
中科院分区：
文献类型：
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作者：
Gioia, Ciro;Borio, Daniele
全球导航卫星系统使用独立的时间尺度运行，因此必须确定系统间时间偏移以实现多星座导航解决方案。GPS/伽利略系统间的偏差和漂移在这里使用不同类型的接收机进行评估：两个大众市场和两个专业接收机。此外，三种不同的方法被认为是系统间的偏差确定：在第一个，广播伽利略到GPS的时间偏移被用来对齐GPS和伽利略的时间尺度。在第二种方法中，系统间偏差包含在多星座导航解中，并使用可用的测量值进行估计。最后，提出了一种利用系统间偏差时间演化约束的增强算法。用不同的方法得到的系统间偏差估计进行了分析，并使用Allan偏差对其稳定性进行了实验评估。系统间的偏差的位置，速度，时间的解决方案的影响也被认为是和性能分析的方法进行评估的标准偏差和平均误差水平和垂直分量。从实验中可以看出，系统间偏差是非常稳定的，使用约束，模拟GPS/伽利略系统间偏差行为，显着提高了多星座导航的性能。
Global navigation satellite system operates using independent time scales and thus inter-system time offsets have to be determined to enable multi-constellation navigation solutions. GPS/Galileo inter-system bias and drift are evaluated here using different types of receivers: two mass market and two professional receivers. Moreover, three different approaches are considered for the inter-system bias determination: in the first one, the broadcast Galileo to GPS time offset is used to align GPS and Galileo time scales. In the second, the inter-system bias is included in the multi-constellation navigation solution and is estimated using the measurements available. Finally, an enhanced algorithm using constraints on the inter-system bias time evolution is proposed. The inter-system bias estimates obtained with the different approaches are analysed and their stability is experimentally evaluated using the Allan deviation. The impact of the inter-system bias on the position velocity time solution is also considered and the performance of the approaches analysed is evaluated in terms of standard deviation and mean errors for both horizontal and vertical components. From the experiments, it emerges that the inter-system bias is very stable and that the use of constraints, modelling the GPS/Galileo inter-system bias behaviour, significantly improves the performance of multi-constellation navigation.