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Improve real-time GNSS orbit with epoch-independent undifferenced ambiguity resolution
Advances in Space Research ( IF 2.8 ) Pub Date : 2021-08-23 , DOI: 10.1016/j.asr.2021.08.021
Kaifa Kuang 1 , Jiancheng Li 2 , Shoujian Zhang 2 , Hui Wei 2 , Xinyun Cao 3
Affiliation  

AR (Ambiguity Resolution) is one of the critical issues in high-accuracy GNSS (Global Navigation Satellite System) applications. Commonly, the double-difference AR technique is employed in GNSS network data processing. With the demand of high-accuracy, low-latency and high-integrity GNSS orbit, the orbit estimation in sequential mode becomes a candidate of that in batch mode. Unlike orbit estimation with double-difference AR in either batch or sequential mode, researches on real-time orbit estimation with undifferenced AR in sequential mode is still limited. In this study, real-time orbit determination with epoch-independent undifferenced AR in sequential mode is assessed. With one-week observation data from about 100 global distributed IGS (International GNSS Service) network stations, simulated real-time Galileo orbit determination are conducted with GFZ post-processed solution as reference for validation. Numerical results indicate that, first, the 3D error RMS (Root Mean Square) of fixed orbit is about 30% smaller than that of float orbit; second, the Galileo orbit error RMS reach 3.66, 3.60 and 3.09 cm for the radial, tangential and normal directions respectively for the fixed solution; third, small jumps exist in the real-time orbit and may be attributed to the temporal variations of UPD (Uncalibrated Phase Delay) and wrongly fixed ambiguities. In summary, the orbit quality is comparable to that of IGS real-time solutions, and further improvements may be achieved with improved AR constraint strategy and background orbit model.



中文翻译:

使用独立于纪元的无差异模糊度分辨率改进实时 GNSS 轨道

AR(模糊度解决)是高精度GNSS(全球导航卫星系统)应用中的关键问题之一。GNSS网络数据处理中通常采用双差AR技术。随着高精度、低延迟和高完整性GNSS轨道的需求,顺序模式的轨道估计成为批处理模式的候选。与批量或序列模式下双差分AR的轨道估计不同,序列模式下无差分AR实时轨道估计的研究仍然有限。在这项研究中,评估了在顺序模式下使用独立于纪元的无差异 AR 的实时轨道确定。来自全球约100个分布式IGS(国际GNSS服务)网络站的一周观测数据,模拟实时伽利略定轨以GFZ后处理解为参考进行验证。数值结果表明,第一,固定轨道的3D误差RMS(均方根)比浮动轨道小30%左右;其次,固定解的径向、切向和法线方向的伽利略轨道误差RMS分别达到3.66、3.60和3.09 cm;第三,实时轨道中存在小跳跃,这可能是由于 UPD(未校准相位延迟)的时间变化和错误固定的模糊度。综上所述,轨道质量可与IGS实时解决方案相媲美,通过改进AR约束策略和背景轨道模型可以实现进一步的改进。首先,固定轨道的3D误差RMS(均方根)比浮动轨道小30%左右;其次,固定解的径向、切向和法线方向的伽利略轨道误差RMS分别达到3.66、3.60和3.09 cm;第三,实时轨道中存在小跳跃,这可能是由于 UPD(未校准相位延迟)的时间变化和错误固定的模糊度。综上所述,轨道质量可与IGS实时解决方案相媲美,通过改进AR约束策略和背景轨道模型可以实现进一步的改进。首先,固定轨道的3D误差RMS(均方根)比浮动轨道小30%左右;其次,固定解的径向、切向和法线方向的伽利略轨道误差RMS分别达到3.66、3.60和3.09 cm;第三,实时轨道中存在小跳跃,这可能是由于 UPD(未校准相位延迟)的时间变化和错误固定的模糊度。综上所述,轨道质量可与IGS实时解决方案相媲美,通过改进AR约束策略和背景轨道模型可以实现进一步的改进。第三,实时轨道中存在小跳跃,这可能是由于 UPD(未校准相位延迟)的时间变化和错误固定的模糊度。综上所述,轨道质量可与IGS实时解决方案相媲美,通过改进AR约束策略和背景轨道模型可以实现进一步的改进。第三,实时轨道中存在小跳跃,这可能是由于 UPD(未校准相位延迟)的时间变化和错误固定的模糊度。综上所述,轨道质量可与IGS实时解决方案相媲美,通过改进AR约束策略和背景轨道模型可以实现进一步的改进。

更新日期:2021-08-23
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