Galileo orbit and clock quality of the IGS Multi-GNSS Experiment

Steigenberger, Peter; Hugentobler, Urs; Loyer, S.; Pérosanz, F.; Prange, Lars; Dach, Rolf; Uhlemann, Maik; Gendt, G.; Montenbruck, Oliver

doi:10.1016/j.asr.2014.06.030

Cited by 133 publications

(53 citation statements)

References 17 publications

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“…Various IGS Analysis Centers (ACs) and researchers have routinely provided precise satellite orbit and clock products for BDS (Zhao et al 2013), Galileo (Hackel et al 2013), QZSS (Steigenberger et al 2013) in addition to GPS and GLONASS, based on the MGEX stations. The Galileo precise orbit solutions generated by the Technische Universität München (TUM) and CNES/Collect Localization Satellites (CLS) have demonstrated a precision of one decimeter (Steigenberger et al 2015). Similar results have been achieved for BDS precise orbit solution with the PANDA software by Wuhan University (Zhao et al 2013;Lou et al 2014).…”

Section: Introductionsupporting

confidence: 72%

Multi-GNSS precise point positioning with raw single-frequency and dual-frequency measurement models

et al. 2015

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The emergence of multiple satellite navigation systems, including BDS, Galileo, modernized GPS, and GLONASS, brings great opportunities and challenges for precise point positioning (PPP). We study the contributions of various GNSS combinations to PPP performance based on undifferenced or raw observations, in which the signal delays and ionospheric delays must be considered. A priori ionospheric knowledge, such as regional or global corrections, strengthens the estimation of ionospheric delay parameters. The undifferenced models are generally more suitable for single-, dual-, or multi-frequency data processing for single or combined GNSS constellations. Another advantage over ionospheric-free PPP models is that undifferenced models avoid noise amplification by linear combinations. Extensive performance evaluations are conducted with multi-GNSS data sets collected from 105 MGEX stations in July 2014. Dual-frequency PPP results from each single constellation show that the convergence time of undifferenced PPP solution is usually shorter than that of ionospheric-free PPP solutions, while the positioning accuracy of undifferenced PPP shows more improvement for the GLONASS system. In addition, the GLONASS undifferenced PPP results demonstrate performance advantages in high latitude areas, while this impact is less obvious in the GPS/GLONASS combined configuration. The results have also indicated that the BDS GEO satellites have negative impacts on the undifferenced PPP performance given the current ''poor'' orbit and clock knowledge of GEO satellites. More generally, the multi-GNSS undifferenced PPP results have shown improvements in the convergence time by more than 60 % in both the single-and dual-frequency PPP results, while the positioning accuracy after convergence indicates no significant improvements for the dual-frequency PPP solutions, but an improvement of about 25 % on average for the single-frequency PPP solutions.

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Section: Introductionsupporting

confidence: 72%

Multi-GNSS precise point positioning with raw single-frequency and dual-frequency measurement models

et al. 2015

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“…In recent research, the quality of IGS MGEX products has been evaluated, e.g., Steigenberger et al (2013Steigenberger et al ( , 2015, Steigenberger and Montenbruck (2017). However, there is no current literature devoted to the assessment of the multi-GNSS products for RT users.…”

Section: Goal Of This Studymentioning

confidence: 99%

Quality assessment of multi-GNSS orbits and clocks for real-time precise point positioning

2017

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“…Meanwhile, various ACs and agencies have been providing the multi-GNSS products [29,30] and the satellite orbit/clock products for most of the new constellations have also been generated on a routine basis [31], which inspires much interest in using the multi-GNSS observations for PPP technique. The main supporters of MGEX are the CNES, Institut National de l'Information Géographique et Forestière (IGN), Geoscience Australia (GA), GFZ, Japan Aerospace Exploration Agency (JAXA), DLR, BKG, and the ESA, which contribute to roughly three quarters of the multi-GNSS stations.…”

Section: Multi-gnss Datamentioning

confidence: 99%

Real-Time Tropospheric Delays Retrieved from Multi-GNSS Observations and IGS Real-Time Product Streams

Chen

Liu

et al. 2017

Remote Sensing

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Abstract:The multi-constellation Global Navigation Satellite Systems (GNSS) offers promising potential for the retrieval of real-time (RT) atmospheric parameters to support time-critical meteorological applications, such as nowcasting or regional short-term forecasts. In this study, we processed GNSS data from the globally distributed Multi-GNSS Experiment (MGEX) network of about 30 ground stations by using the precise point positioning (PPP) technique for retrieving RT multi-GNSS tropospheric delays. RT satellite orbit and clock product streams from the International GNSS Service (IGS) were used. Meanwhile, we assessed the quality of clock and orbit products provided by different IGS RT services, called CLK01, CLK81, CLK92, GFZC2, and GFZD2, respectively. Using the RT orbit and clock products, the performances of the RT zenith total delays (ZTD) retrieved from single-system as well as from multi-GNSS combined observations were evaluated by comparing with the U.S. Naval Observatory (USNO) final troposphere products. With the addition of multi-GNSS observations, RT ZTD estimates with higher accuracy and enhanced reliability compared to the single-system solution can be obtained. Compared with the Global Positioning System (GPS)-only solution, the improvements in the initialization time of ZTD estimates are about 5.8% and 8.1% with the dual-system and the four-system combinations, respectively. The RT ZTD estimates retrieved with the GFZC2 products outperform those derived from the other IGS-RT products. In the GFZC2 solution, the accuracy of about 5.05 mm for the RT estimated ZTD can be achieved with fixing station coordinates. The results also confirm that the accuracy improvement (about 22.2%) can be achieved for the real-time estimated ZTDs by using multi-GNSS observables, compared to the GPS-only solution. In the multi-GNSS solution, the accuracy of real-time retrieved ZTDs can be improved by a factor of up to 2.7 in the fixing coordinate mode, compared with that in the kinematic mode.

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Galileo orbit and clock quality of the IGS Multi-GNSS Experiment

Cited by 133 publications

References 17 publications

Multi-GNSS precise point positioning with raw single-frequency and dual-frequency measurement models

Multi-GNSS precise point positioning with raw single-frequency and dual-frequency measurement models

Quality assessment of multi-GNSS orbits and clocks for real-time precise point positioning

Real-Time Tropospheric Delays Retrieved from Multi-GNSS Observations and IGS Real-Time Product Streams

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