Investigation of the GFS forecast products on RT-PPP solutions

IF 2.2 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Journal of Atmospheric and Solar-Terrestrial Physics Pub Date : 2026-03-01 Epub Date: 2026-02-03 DOI:10.1016/j.jastp.2026.106755

Ali Hasan Dogan

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引用次数: 0

Abstract

Tropospheric delays play a key role in Precise Point Positioning (PPP). To achieve high precise positioning, these delays must be eliminated. In PPP, a priori delays and mapping functions (MF) are used to eliminate/model tropospheric delays. It can be seen in literature that the parameters obtained from Numerical Weather Models (NWM) increase the accuracy of the positioning. In addition to post-process applications of PPP, there is an increasing need of real time precise positioning to support recent technological developments. In this study, the effects of the a priori delays and MFs on real time PPP (RT-PPP) were investigated. Therefore, a case study was designed. In the study, two simultaneous RT-PPP analysis were performed by BNC software. In the first run, default configuration of the software was used. In the second run, a priori delays and MFs obtained using NCEP's GFS forecast data were utilized. The delays and MF coefficients were derived by Direct Numerical Solution (DNS) ray-tracing tool. The effects of the parameters were compared by the parameters, convergence time, positioning and Zenith Tropospheric Delay accuracy. The results show that GFS utilized solutions converge the positions faster. Moreover, accuracy of the vertical component is also improved.

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GFS对RT-PPP解决方案预测产品的研究

对流层延迟在精确点定位（PPP）中起着关键作用。为了实现高精度定位，必须消除这些延迟。在PPP中，使用先验延迟和映射函数（MF）来消除/模拟对流层延迟。从文献中可以看出，数值天气模式（NWM）获得的参数增加了定位的精度。除了PPP的后处理应用之外，对实时精确定位的需求也越来越大，以支持最近的技术发展。本研究探讨了先验延迟和先验时间对实时PPP （RT-PPP）的影响。因此，设计了一个案例研究。本研究采用BNC软件同时进行两次RT-PPP分析。在第一次运行时，使用了软件的默认配置。在第二次运行中，利用NCEP的GFS预报数据获得的先验延迟和MFs。利用直接数值解（DNS）射线追踪工具推导了延迟和MF系数。通过参数、收敛时间、定位和天顶对流层延迟精度对各参数的影响进行了比较。结果表明，GFS所采用的解收敛速度更快。此外，垂直分量的精度也得到了提高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Atmospheric and Solar-Terrestrial Physics 地学-地球化学与地球物理

CiteScore

4.10

自引率

5.30%

发文量

审稿时长

6 months

期刊介绍： The Journal of Atmospheric and Solar-Terrestrial Physics (JASTP) is an international journal concerned with the inter-disciplinary science of the Earth''s atmospheric and space environment, especially the highly varied and highly variable physical phenomena that occur in this natural laboratory and the processes that couple them. The journal covers the physical processes operating in the troposphere, stratosphere, mesosphere, thermosphere, ionosphere, magnetosphere, the Sun, interplanetary medium, and heliosphere. Phenomena occurring in other "spheres", solar influences on climate, and supporting laboratory measurements are also considered. The journal deals especially with the coupling between the different regions. Solar flares, coronal mass ejections, and other energetic events on the Sun create interesting and important perturbations in the near-Earth space environment. The physics of such "space weather" is central to the Journal of Atmospheric and Solar-Terrestrial Physics and the journal welcomes papers that lead in the direction of a predictive understanding of the coupled system. Regarding the upper atmosphere, the subjects of aeronomy, geomagnetism and geoelectricity, auroral phenomena, radio wave propagation, and plasma instabilities, are examples within the broad field of solar-terrestrial physics which emphasise the energy exchange between the solar wind, the magnetospheric and ionospheric plasmas, and the neutral gas. In the lower atmosphere, topics covered range from mesoscale to global scale dynamics, to atmospheric electricity, lightning and its effects, and to anthropogenic changes.