Studying the Fixing Rate of GPS PPP Ambiguity Resolution Under Different Geomagnetic Storm Intensities

IF 3.8 2区地球科学 Q2 ASTRONOMY & ASTROPHYSICS

Space Weather-The International Journal of Research and Applications Pub Date : 2023-10-01 DOI:10.1029/2023sw003542

Xiaomin Luo, Zhuang Chen, Shengfeng Gu, Neng Yue, Tao Yue

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引用次数: 0

Abstract

Abstract Global Positioning System (GPS) Precise Point Positioning (PPP) with correct fixing ambiguity resolution (AR) can reach cm‐mm level positioning accuracy. However, this accuracy can be degraded by the geomagnetic storm effects. To comprehensively investigate the ambiguity resolved percentage (ARP) of GPS kinematic PPP, referred to as PPP‐ARP, under different intensities of geomagnetic storms, based on the Natural Resources Canada's Canadian Spatial Reference System (CSRS) PPP, this study for the first time gives the correlation between the PPP‐ARP and storm intensity using 67 storms occurred in the past 5 years of 2018–2022. Experimental results indicate that the PPP‐ARP decreases gradually as the increase of geomagnetic storm intensity. Under quiet and low geomagnetic conditions (Dst min > −50 nT), the PPP‐ARP of global GNSS stations can achieve more than 96%, while these during strong storms (Dst min ≤ −100 nT) are generally lower than 90.0%, especially for the PPP‐ARP of some stations located at low latitudes which are lower than 40.0%. The mechanism of PPP‐ARP decrease under geomagnetic storms is mainly due to the cycle slips and even loss of lock of GNSS signals caused by the storms induced ionospheric disturbances and scintillations. In addition, different from many previous studies, we found that the CSRS‐PPP with AR can achieve good positioning accuracy (3D RMS <0.2 m) even under strong geomagnetic storms.

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不同地磁风暴强度下GPS PPP模糊度解定率研究

全球定位系统(GPS)精确点定位(PPP)具有正确的定位模糊分辨率(AR)，可以达到cm - mm级的定位精度。然而，这种精度可能会因地磁风暴的影响而降低。基于加拿大自然资源部的加拿大空间参考系统(CSRS) PPP，为了全面研究不同地磁风暴强度下GPS运动PPP (PPP‐ARP)的模糊解决百分比(ARP)，本研究首次利用2018-2022年过去5年发生的67次风暴，给出了PPP‐ARP与风暴强度的相关性。实验结果表明，PPP‐ARP随磁暴强度的增加而逐渐减小。在安静和低地磁条件下(Dst min >−50 nT)时，全球GNSS站的PPP‐ARP可以达到96%以上，而在强风暴(Dst min≤−100 nT)时，全球GNSS站的PPP‐ARP一般低于90.0%，特别是低纬度地区的一些站的PPP‐ARP低于40.0%。地磁风暴下PPP‐ARP下降的机制主要是由于磁暴引起的电离层扰动和闪烁导致GNSS信号的周期滑移甚至失锁。此外，与以往的许多研究不同，我们发现即使在强磁暴条件下，具有AR的CSRS - PPP也能获得良好的定位精度(3D RMS <0.2 m)。

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来源期刊

Space Weather-The International Journal of Research and Applications 地学天文-地球化学与地球物理

CiteScore

5.90

自引率

29.70%

发文量

166

审稿时长

>12 weeks

期刊介绍： Space Weather: The International Journal of Research and Applications (SWE) is devoted to understanding and forecasting space weather. The scope of understanding and forecasting includes: origins, propagation and interactions of solar-produced processes within geospace; interactions in Earth’s space-atmosphere interface region produced by disturbances from above and below; influences of cosmic rays on humans, hardware, and signals; and comparisons of these types of interactions and influences with the atmospheres of neighboring planets and Earth’s moon. Manuscripts should emphasize impacts on technical systems including telecommunications, transportation, electric power, satellite navigation, avionics/spacecraft design and operations, human spaceflight, and other systems. Manuscripts that describe models or space environment climatology should clearly state how the results can be applied.