Testing impact of the strategy of VLBI data analysis on the estimation of Earth Orientation Parameters and station coordinates

Wielgosz, Agata; Tercjak, Monika; Brzeziński, Aleksander

doi:10.1515/rgg-2016-0017

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…It has been shown that different realizations of TRFs or data processing strategies can give rise to not negligible differences in the EOP determination at the GGOS level of accuracy (see e.g. Wielgosz et al 2016;Heinkelmann et al 2017, Belda et al 2017bSoja et al 2018b). This is not irrelevant from the theoretical perspective since theory must explain observations and help predictions, but it does not accommodate to the actual observational environment as tightly as desirable in some aspects.…”

Section: The Numerical Integration Of Brzeziński's Broad-bandmentioning

confidence: 99%

Report of the IAU/IAG Joint Working Group on Theory of Earth Rotation and Validation

Ferrándiz

Gross

Escapa

et al. 2020

International Association of Geodesy Symposia

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This report focuses on some selected scientific outcomes of the activities developed by the IAU/IAG Joint Working Group on Theory of Earth rotation and validation along the term 2015-2019. It is based on its end-of-term report to the IAG Commission 3 published in the Travaux de l'IAG 2015-2019, which in its turn updates previous reports to the IAG and IAU, particularly the triennial report 2015-2018 to the IAU Commission A2, and the medium term report to the IAG Commission 3 (2015-2017). The content of the report has served as a basis for the IAG General Assembly to adopt Resolution 5 on Improvement of Earth rotation theories and models.

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Section: The Numerical Integration Of Brzeziński's Broad-bandmentioning

confidence: 99%

Report of the IAU/IAG Joint Working Group on Theory of Earth Rotation and Validation

Ferrándiz

Gross

Escapa

et al. 2020

International Association of Geodesy Symposia

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“…The stand approach (SA) [55] for EOP estimation Clock offset Estimated as piecewise linear offsets (60 min), one rate, and one quadratic term per clock…”

Section: Weighting Schemementioning

confidence: 99%

Estimation of Earth Rotation Parameters Based on BDS-3 and Discontinuous VLBI Observations

Wang,

Sang,

et al. 2024

Remote Sensing

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Earth rotation parameters (ERPs) are fundamental to geodetic and astronomical studies. With its high measurement accuracy and stability, the Very Long Baseline Interferometry (VLBI) plays an irreplaceable role in estimating the ERPs and maintaining the earth reference frame. However, the imperfect global station distribution, observation discontinuity, and vast cost of the VLBI make the GNSS a more attractive technique. In 2020, the third generation of the BeiDou Navigation System (BDS), namely BDS-3, was constructed completely. In this study, we conducted a series of experiments to estimate Earth’s rotation parameters based on the continuous BDS-3 observation data, the discontinuous VLBI observation data, and the combined BDS-3 and discontinuous VLBI observation data. We used two methods, namely the weighted averaging method and the normal equation combination method, to obtain ERP combination solutions. The results are compared with the International Earth Rotation and Reference Systems Service (IERS) EOP 20C04 at 00:00:00 UTC. Final results show that (a) the estimation accuracy becomes stable when the number of BDS-3 tracking stations is more than 40. At the same time, both the number of stations and the volume of polyhedrons formed by the observing stations affect the accuracy of the ERPs estimated by the BDS-3 or VLBI. (b) Results have also shown that the inclusion of the BDS-3 IGSO and GEO satellites contributes little to the ERP estimation. (c) For the BDS-3-only MEO satellites solution, the root mean square (RMS) was 113.2 µas, 102.8 µas, and 13.1 µs/day for X-pole coordinate, Y-pole coordinate, and length of day (LOD), respectively. For the VLBI solution, the RMSs of the X-pole, Y-pole, and LOD were 100.4 µas for the X-pole, 94.2 µas for the Y-pole, and 14.1 µs/day. The RMS was 82.6 µas, 70.3 µas, and 10.5 µs/day for the combined X-pole, Y-pole, and LOD using the weighted averaging method. It was 78.2 µas, 62.6 µas, and 8.6 µs/day when the normal equation combination method was applied. This demonstrates that by taking advantage of the BDS-3 and VLBI technique combinations, accuracy in estimating the ERPs can be improved over that using either of them, in addition to enhanced stability and reliability.

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“…The absolute orientation of the Earth can be determined using only VLBI (or LLR). However, VLBI products are given session-wise, thus, there are some days with missing VLBI products (Wielgosz et al, 2016). Therefore, satellite techniques, GNSS and SLR, are used to provide the Earth rotation parameter UT1-UTC by deriving relative changes of this parameter -excess of the Length-of-Day.…”

Section: Ggos -Three Pillars Observational Techniques and Geodetic Pa...mentioning

confidence: 99%

Geodesy and Cartography

Sośnica¹,

Bosy²

2019

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Global Geodetic Observing System (GGOS) was established in 2003 by the International Association of Geodesy (IAG) with the main goal to deepen understanding of the dynamic Earth system by quantifying human-induced Earth's changes in space and time. GGOS allows not only for advancing Earth Science, including solid Earth, oceans, ice, atmosphere, but also for better understanding processes between different constituents forming the system Earth, and most importantly, for helping authorities to make intelligent societal decisions. GGOS comprises different components to provide the geodetic infrastructure necessary for monitoring the Earth system and global changes. The infrastructure spreads from the global scale, through regional, to national scales. This contribution describes the GGOS structure, components, and goals with the main focus on GGOS activities in Poland, including both the development of the geodetic observing infrastructure as well as advances in processing geodetic observations supporting GGOS goals and providing high-accuracy global geodetic parameters.

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Testing impact of the strategy of VLBI data analysis on the estimation of Earth Orientation Parameters and station coordinates

Cited by 5 publications

References 11 publications

Report of the IAU/IAG Joint Working Group on Theory of Earth Rotation and Validation

Report of the IAU/IAG Joint Working Group on Theory of Earth Rotation and Validation

Estimation of Earth Rotation Parameters Based on BDS-3 and Discontinuous VLBI Observations

Geodesy and Cartography

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