Analysis of Wide-Lane Ambiguities Derived from Geometry-Free and Geometry-Based Precise Point Positioning Models and Their Implication for Orbit and Clock Quality.
Analysis of Wide-Lane Ambiguities Derived from Geometry-Free and Geometry-Based Precise Point Positioning Models and Their Implication for Orbit and Clock Quality.
复制标题
无几何和基于几何的精密单点定位模型产生的宽巷模糊度分析及其对轨道和时钟质量的影响
DOI：
10.3390/s18061760
复制
发表时间：
2018-05-31
期刊：
影响因子：
--
通讯作者：
Zhao Q
中科院分区：
文献类型：
--
作者：
Chen G;Liu S;Zhao Q
轨道和时钟产品用于实时全球导航卫星系统 (GNSS) 精确单点定位 (PPP)，但不知道其质量。本研究通过比较 PPP 模型中的无几何和基于几何的宽车道模糊度，开发了一种检测轨道和时钟误差的新方法。详细描述了无几何和基于几何的模糊度的重新参数化和估计过程。轨道和时钟误差对模糊度的影响在解析表达式中给出。使用不同的轨道和时钟产品分析了无几何和基于几何的宽巷模糊度的数值相似性和差异。此外，还对轨道和时钟中的两种典型误差进行了模拟，并对它们对宽巷模糊度的影响进行了数值分析。该贡献表明，无几何和基于几何的宽巷模糊度在形式错误方面是等效的。尽管当用于基于几何的模糊度的所使用的轨道和时钟足够精确时，它们在估计方面非常接近，但它们并不相同，特别是在所使用的轨道和时钟作为组合包含显着误差的情况下。研究发现，无几何和基于几何的宽车道模糊度的差异与所使用的轨道和时钟在视线方向上的实际时变误差一致。这为实时用户检测实时轨道和时钟产品的误差提供了质量指标，从而潜在地提高了定位精度。
Orbit and clock products are used in real-time global navigation satellite systems (GNSS) precise point positioning (PPP) without knowing their quality. This study develops a new approach to detect orbit and clock errors through comparing geometry-free and geometry-based wide-lane ambiguities in a PPP model. The reparameterization and estimation procedures of the geometry-free and geometry-based ambiguities are described in detail. The effects of orbit and clock errors on ambiguities are given in analytical expressions. The numerical similarity and differences of geometry-free and geometry-based wide-lane ambiguities are analyzed using different orbit and clock products. Furthermore, two types of typical errors in orbit and clock are simulated and their effects on wide-lane ambiguities are numerically produced and analyzed. The contribution discloses that the geometry-free and geometry-based wide-lane ambiguities are equivalent in terms of their formal errors. Although they are very close in terms of their estimates when the used orbit and clock for geometry-based ambiguities are precise enough, they are not the same, in particular, in the case that the used orbit and clock, as a combination, contain significant errors. It is discovered that the discrepancies of geometry-free and geometry-based wide-lane ambiguities coincide with the actual time-variant errors in the used orbit and clock at the line-of-sight direction. This provides a quality index for real-time users to detect the errors in real-time orbit and clock products, which potentially improves the accuracy of positioning.
登录
查看更多内容
改进精确单点定位中模糊度解析的分数周期偏差估计
影响因子：
4.4
作者：
Geng, Jianghui;Shi, Chuang;Liu, Jingnan
通讯作者：
Liu, Jingnan
影响因子：
2.6
作者：
Lou, Yidong;Zhang, Weixing;Liu, Jingnan
通讯作者：
Liu, Jingnan
影响因子：
4.9
作者：
Geng, Jianghui;Teferle, F. N.;Liu, J.
通讯作者：
Liu, J.
影响因子：
3.9
作者：
Zumberge, JF;Heflin, MB;Webb, FH
通讯作者：
Webb, FH
影响因子：
4.9
作者：
Kazmierski, Kamil;Sosnica, Krzysztof;Hadas, Tomasz
通讯作者：
Hadas, Tomasz