Multi-GNSS inter-system biases: estimability analysis and impact on RTK positioning
Multi-GNSS inter-system biases: estimability analysis and impact on RTK positioning
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多 GNSS 系统间偏差：可估计性分析及其对 RTK 定位的影响
DOI：
10.1007/s10291-019-0873-8
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发表时间：
2019-07
期刊：
影响因子：
4.9
通讯作者：
Yuan Yunbin
中科院分区：
文献类型：
--
作者：
Mi Xiaolong;Zhang Baocheng;Yuan Yunbin
系统间偏差（ISB）对于多个全球导航卫星系统（GNSS）的码和相位数据的组合处理具有重要意义。校准ISB使得有可能增强不同GNSS星座之间的互操作性，从而有益于基于多GNSS的定位、导航和定时应用。对ISB的特性进行了初步的研究，通常利用重叠频率和采用双差（DD）模型。然而，当处理非重叠频率的ISB时，这种方法似乎不适用。我们通过使用电离层浮动，电离层固定和电离层加权模型制定的基础上，接收器间单差（SD）多GNSS观测方程，从而在所谓的SD方法，这是能够估计的ISB重叠和非重叠频率的情况下，确定ISB的可估计性。使用短基线和中基线的双频数据，我们分析了GPS-Galileo和GPS-BDS ISB的30秒逐时估计。定量结果表明，使用SD方法或基于DD观测的常规方法（称为DD方法）得出相同的结论;即，从统计角度来看，代码和相位ISB时间序列在几天的时间尺度上都是近似恒定的。然而，SD方法的优点在于，它可以用于灵活地估计重叠和非重叠频率的ISB，因此可以比DD方法更好地应用于实时动态定位。此外，由于ISB的合理校准，与每个星座选择S基的SD经典差分相比，使用系统间差分的多GNSS定位精度可以提高20- 35%。
Inter-system biases (ISB) are of great relevance for the combined processing of the code and phase data of multiple global navigation satellite systems (GNSSs). Calibrating the ISB makes it possible to enhance the interoperability among different GNSS constellations and thus benefits multi-GNSS-based positioning, navigation and timing applications. Initial investigations of the characteristics of ISB have been carried out, usually making use of overlapping frequencies and adopting the double-differenced (DD) model. However, this approach seems inapplicable when dealing with ISB for non-overlapping frequencies. We identify the estimability of the ISB by using the ionospheric-float, ionospheric-fixed and ionospheric-weighted models formulated on the basis of between-receiver single-differenced (SD) multi-GNSS observation equations, resulting in the so-called SD method, which is capable of estimating the ISB in case of both overlapping and non-overlapping frequencies. Using dual-frequency data for short and medium baselines, we analyze 30-s epoch-by-epoch estimates of the GPS–Galileo and GPS–BDS ISB. The quantitative results indicate that the same conclusion is reached using either the SD method or the customary method based on DD observations (called the DD method); that is, the code and phase ISB time series are both approximately constant on a time scale of a few days from a statistical perspective. However, the SD method has the advantage that it can be used to flexibly estimate ISB for both overlapping and non-overlapping frequencies and thus can be better applied for real-time kinematic positioning than the DD method. Furthermore, the multi-GNSS positioning accuracy using inter-system differencing can be improved by 20–35%, as compared to the SD classical differencing in whichS-basis is selected per constellation, thanks to the reasonable calibration of the ISB.
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影响因子：
4.9
作者：
Nan Jiang;Yan Xu;Tianhe Xu;Guochang Xu;Zhangzhen Sun;H. Schuh
通讯作者：
Nan Jiang;Yan Xu;Tianhe Xu;Guochang Xu;Zhangzhen Sun;H. Schuh
通过多 GNSS 观测确定差分代码偏差
影响因子：
4.4
作者：
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通讯作者：
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影响因子：
2.4
作者：
Odolinski, R.;Teunissen, P. J. G.;Odijk, D.
通讯作者：
Odijk, D.
影响因子：
4.9
作者：
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通讯作者：
P. Wielgosz
影响因子：
4.9
作者：
Dalla Torre, Andrea;Caporali, Alessandro
通讯作者：
Caporali, Alessandro