Influence of orbit and clock file diversity on GNSS ambiguity resolution
-
Heba K. Khayyal
,
Fawzi H. Zarzoura
Abstract
The continuous and accurate determination of positions, velocities, and time in Global Navigation Satellite Systems (GNSS) fundamentally relies on the precise knowledge of satellite orbits and clock information. These critical components, commonly referred to as orbit and clock files, serve as the backbone of GNSS systems such as GPS, GLONASS, Galileo, and others. They play an essential role in enabling high-accuracy positioning services for a wide range of applications, including navigation, mapping, scientific research, and time synchronization. A clear understanding of the principles and functionality of these orbit and clock files is paramount for comprehending the intricate mechanisms that underpin GNSS systems and their profound impact on positioning accuracy. This study provides a comprehensive exploration of GNSS systems with a particular focus on accuracy enhancement. The research primarily aims to elucidate the pivotal role played by a diverse array of organizations in supplying accurate and reliable orbit and clock files. By examining the multifaceted contributions and effects of these entities, the investigation unveils the complex processes through which GNSS accuracy is elevated to unprecedented levels. The findings underscore the indispensable contributions of these organizations in advancing the precision and reliability of GNSS technologies, thereby highlighting their critical importance in supporting the ever-growing demands of global positioning and timing applications.
-
Research ethics: This study adheres to ethical standards in research, ensuring that all data used for analysis were obtained from publicly available sources and that proper acknowledgments are given to the respective organizations providing the GNSS data.
-
Informed consent: Not applicable.
-
Author contributions: The contributions to the research were divided among four authors. The first author was responsible for analyzing the subject matter and writing the introduction and methodology sections and analyze the data. The second author drafted the results section and played a key role in steering the overall preparation of the document. The fourth author oversaw all elements of the project, contributed to formulating conclusions, and provided recommendations based on the findings. Lastly, the third author led the validation process and coordinated with corresponding authors to ensure the completeness and verification of the document.
-
Use of Large Language Models, AI and Machine Learning Tools: None declared.
-
Conflict of interest: The authors declare no conflicts of interest related to the research presented in this paper.
-
Research funding: This research was conducted without any external funding. All authors contributed equally to the research and preparation of this manuscript.
-
Data availability: All data utilized in this study were anonymized and do not contain any personally identifiable information.
-
Copyright: The authors confirm that the content of this manuscript is original and has not been published elsewhere. Proper citations are provided for any third-party sources referenced.
-
Permissions: All necessary permissions for data usage and publication have been obtained from the respective data providers.
-
Compliance with Regulations: This research complies with all applicable laws and regulations regarding the use of GNSS data as well as ethical guidelines established by the academic institutions involved.
References
1. Leandro, RF, Santos, MC, Langley, RB. Analyzing GNSS data in precise point positioning software. GPS Solut 2011;15:1–3. https://doi.org/10.1007/s10291-010-0173-9.Suche in Google Scholar
2. Vadakke Veettil, S, Aquino, M. Statistical models to provide meaningful information to GNSS users in the presence of ionospheric scintillation. GPS Solut 2021;25:1–2. https://doi.org/10.1007/s10291-020-01083-x.Suche in Google Scholar
3. Shehata, AG, Zarzoura, FH, El-mewafi, M. Precision comparison for different GNSS PPP solution using online services and open-source software processing CSRS-PPP. Univ J Civil Eng 2023;2:1–7. https://doi.org/10.37256/ujce.2120231865.Suche in Google Scholar
4. Segun, AA, Abiodun, AI. A review of global navigation satellite systems (GNSS) and its applications. J. Navig. 2021;74:453–71.Suche in Google Scholar
5. Shehata, AG. Implementing SRIF filter with MANS-PPP software package for GNSS precise point position solution. J Appl Geodesy 2023;17:373–81. https://doi.org/10.1515/jag-2023-0017.Suche in Google Scholar
6. Wolf, R. Satellite orbit and ephemeris determination using inter satellite links. J Geod 2000;74:247–63.Suche in Google Scholar
7. Tegedor, J, Øvstedal, O, Vigen, E. Precise orbit determination and point positioning using GPS, Glonass, Galileo and BeiDou. J Geod Sci 2014;4. https://doi.org/10.2478/jogs-2014-0008.Suche in Google Scholar
8. Shi, J, Xu, C, Li, Y, Gao, Y. Impacts of real-time satellite clock errors on GPS precise point positioning-based troposphere zenith delay estimation. J Geod 2015;89:747–56. https://doi.org/10.1007/s00190-015-0811-7.Suche in Google Scholar
9. Shirazian, M. Quality description in GPS precise point positioning. Chem; 2013 [Online]. Available from: http://onlinelibrary.wiley.com/doi/10.1002/cbdv.200490137/abstract%5Cnhttp://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-118349.Suche in Google Scholar
10. Shehata, AG, Zarzoura, FH, El-Mewafi, M. Assessing the influence of differential code bias and satellite geometry on GNSS ambiguity resolution through MANS-PPP software package. J Appl Geodesy 2023;18:1–20. https://doi.org/10.1515/jag-2023-0032.Suche in Google Scholar
11. Dach, R, Hugentobler, U, Fridez, P, Meindl, M, editors. Bernese GPS software version 5.0. Bern, Switzerland: Astronomical Institute, University of Bern; 2007.Suche in Google Scholar
12. Springer, T, Hugentobler, U. IGS ultra-rapid products for (near-) real-time applications. Phys Chem Earth Solid Earth Geodes 2001;26:623–8. https://doi.org/10.1016/s1464-1895(01)00111-9.Suche in Google Scholar
13. Uhlemann, M, Gendt, G, Ramatschi, M, Deng, Z. GFZ global multi-GNSS network and data processing results. In: International association of geodesy symposia. Potsdam, Germany: Springer; 2016, 143:673–9 pp.10.1007/1345_2015_120Suche in Google Scholar
14. Loyer, S, Perosanz, F, Mercier, F, Capdeville, H, Marty, JC. Zero-difference GPS ambiguity resolution at CNES–CLS IGS analysis center. J Geod 2012;86:991–1003. https://doi.org/10.1007/s00190-012-0559-2.Suche in Google Scholar
15. Shehata, AG, Zarzoura, FH, El-Mewafi, M. Precision evaluation for different GNSS RINEX 3 using online services and open-source software PPP-MANS. Geodesy Cartogr 2023;49:137–41. https://doi.org/10.3846/gac.2023.17499.Suche in Google Scholar
16. Griffiths, J, Ray, J. On the IGS combined GPS–GLONASS analysis. J Geod 2009;83:353–66.10.1007/s00190-008-0237-6Suche in Google Scholar
17. Zumberge, JF, Heflin, MB, Jefferson, DC, Watkins, MM, Webb, FH. Precise point positioning for the efficient and robust analysis of GPS data from large networks. J Geophys Res Solid Earth 1997;102:5005–17. https://doi.org/10.1029/96jb03860.Suche in Google Scholar
© 2025 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Review
- Research using GNSS (Global Navigation Satellite System) products – a comprehensive literature review
- Original Research Articles
- Impact of baseline length on uncertainty in static relative GNSS positioning
- Advancing magnetometer calibration: a sequential tri-axis approach
- Application of GNSS-levelling for updating the base vertical network
- Spatiotemporal postseismic deformation due to the 2018 Palu-Donggala earthquake revealed the relative importance of viscoelastic relaxation and the afterslip distribution estimated from geodetic observations
- Evaluation of PPP software performance for TEC estimation using IRI-2020, CODE, COSMIC, and SWARM with GNSS data
- Evaluation of mobile mapping point clouds in the context of height difference estimation
- Automated gap and flush measurements between car parts assisted by a highly flexible and accurate robot system
- Comprehensive statistical analysis of scintillations on L-band signals from six GNSS constellations over low-latitude region
- Recent estimates of crustal deformation and land subsidence in the Nile Delta, Egypt using GNSS-PPP datasets over 2012–2024
- Influence of orbit and clock file diversity on GNSS ambiguity resolution
- The usefulness of the MAFA method for smartphone precise positioning
- Comparative analysis of pseudorange multipath mitigation performance using K-means and Fuzzy c-means clustering techniques
- Estimation of GPS-based ionospheric indices by GIX, SIDX, and ROTI during the St. Patrick’s Day geomagnetic storm event in the Indian low latitude region
- Post-midnight impact of ionospheric irregularities on GPS based kinematic precise point positioning
Artikel in diesem Heft
- Frontmatter
- Review
- Research using GNSS (Global Navigation Satellite System) products – a comprehensive literature review
- Original Research Articles
- Impact of baseline length on uncertainty in static relative GNSS positioning
- Advancing magnetometer calibration: a sequential tri-axis approach
- Application of GNSS-levelling for updating the base vertical network
- Spatiotemporal postseismic deformation due to the 2018 Palu-Donggala earthquake revealed the relative importance of viscoelastic relaxation and the afterslip distribution estimated from geodetic observations
- Evaluation of PPP software performance for TEC estimation using IRI-2020, CODE, COSMIC, and SWARM with GNSS data
- Evaluation of mobile mapping point clouds in the context of height difference estimation
- Automated gap and flush measurements between car parts assisted by a highly flexible and accurate robot system
- Comprehensive statistical analysis of scintillations on L-band signals from six GNSS constellations over low-latitude region
- Recent estimates of crustal deformation and land subsidence in the Nile Delta, Egypt using GNSS-PPP datasets over 2012–2024
- Influence of orbit and clock file diversity on GNSS ambiguity resolution
- The usefulness of the MAFA method for smartphone precise positioning
- Comparative analysis of pseudorange multipath mitigation performance using K-means and Fuzzy c-means clustering techniques
- Estimation of GPS-based ionospheric indices by GIX, SIDX, and ROTI during the St. Patrick’s Day geomagnetic storm event in the Indian low latitude region
- Post-midnight impact of ionospheric irregularities on GPS based kinematic precise point positioning
