scholarly journals Sistemas Geodésicos de Referência: Rumo ao GGRS/GGRF

2020 ◽  
Vol 72 ◽  
pp. 962-982
Author(s):  
Regiane Dalazoana ◽  
Sílvio Rogério Correia De Freitas
Keyword(s):  
Reference Frame ◽  
Reference System ◽  
Terrestrial Reference Frame ◽  
Earth Observation ◽  
Geodetic Reference System ◽  
International Terrestrial Reference Frame ◽  
Observation Systems ◽  
International Terrestrial Reference System ◽  
Terrestrial Reference System ◽  
Geodetic Reference Frame

O estabelecimento de Sistemas Geodésicos de Referência globais integrando características geométricas e físicas é um dos desafios atuais da Geodésia, principalmente devido às demandas de diversas áreas do conhecimento de que as informações relacionadas aos Sistemas de Observação da Terra (EOS – Earth Observation Systems), sejam integradas em Redes Geodésicas de Referência (RGRs) com uma acurácia de 10-9 ou melhor. O surgimento das técnicas de posicionamento espacial trouxe melhora significativa na qualidade posicional e possibilitou a substituição das RGRs clássicas por redes modernas com características globais. Hoje, a questão das coordenadas de caráter geométrico, está bem resolvida com o ITRS/ITRF (International Terrestrial Reference System/International Terrestrial Reference Frame). Todavia, aspectos associados a diversos processos físicos, tais como os reflexos das redistribuições de massa, não são atendidos por referenciais puramente geométricos. A aprovação da resolução para o GGRS/GGRF (Global Geodetic Reference System/Global Geodetic Reference Frame) surge com a visão da integração entre o referencial terrestre, o celeste, um referencial com características físicas para as altitudes e a nova rede global de gravidade absoluta. Esforços têm sido feitos para definição e realização deste referencial global para as altitudes. É uma tarefa complexa em vista das características clássicas dos referenciais verticais, heterogeneidade em termos de qualidade e distribuição espacial de dados necessários, principalmente os relacionados ao campo de gravidade da Terra. Apresentam-se como grandes desafios para o futuro a necessidade de estabelecimento de procedimentos padrão para a integração ao referencial altimétrico global e a precisão necessária para o estabelecimento dos EOS.

Contribution of the Vienna Center for VLBI to ITRF2020

2021 ◽  
Author(s):  
Hana Krásná ◽  
David Mayer ◽  
Sigrid Böhm
Keyword(s):  
Reference Frame ◽  
Terrestrial Reference Frame ◽  
Normal Equation ◽  
Earth Orientation Parameters ◽  
International Vlbi Service ◽  
Analysis Center ◽  
International Terrestrial Reference System ◽  
Terrestrial Reference System ◽  
The Impact ◽  
Orientation Parameters

<p>The next realization of the International Terrestrial Reference System, the ITRF2020, is planned to be released in 2021. Our joint VLBI Analysis Center VIE which runs between TU Wien and BEV is one of eleven IVS (International VLBI Service for Geodesy and Astrometry) analysis centres which provide VLBI input to the ITRF2020. The SINEX files submitted to the IVS Combination Center are produced with the Vienna VLBI and Satellite Software VieVS and contain unconstrained normal equation systems for station position, source coordinates and Earth orientation parameters. In this presentation, we document the included sessions and stations in our submission and introduce the Vienna terrestrial reference frame based on our contribution to the ITRF2020. In particular, we highlight special settings in the Vienna solution and assess the impact on the terrestrial reference frame.</p>

scholarly journals Expressing the NOANET GNSS network to the Hellenic Geodetic Reference System of 1987 (HGRS1987): A synergy between Geodesy and Geodynamics

2018 ◽  
Vol 51 ◽  
pp. 113
Author(s):  
Dimitrios Ampatzidis ◽  
Nikolaos Kalamakis ◽  
Konstantinos Vasileios Katsambalos
Keyword(s):  
Reference Frame ◽  
Reference System ◽  
Main Idea ◽  
Terrestrial Reference Frame ◽  
Transformation Model ◽  
Time Dependent ◽  
Geodetic Reference System ◽  
National Observatory ◽  
Gnss Network ◽  
Better Than

In the present study we describe an algorithm which allows the expression of the coordinates of the NOANET (National Observatory of Athens CORS Network) to the official Greek geodetic reference system (HGRS87). The algorithm exploits the estimated velocities of twelve NONET stations. The main idea is to transform the coordinates (as well as the velocities) from the International Terrestrial Reference Frame 2008 (ITRF2008) to the HGRS1987. This is realised by (a) the use of the 3D time-dependent transformation model and (b) using the transformation tool provided by the Greek Cadastral and Mapping Agency. The final products are the projection coordinates (X,Y) and the orthometric heights of the twelve stations. We expect accuracy better than 10 cm for the projection coordinates, while for the estimation of the heights, the accuracy remains uncertain.

New trends for the realization of the international terrestrial reference system

2002 ◽  
Vol 30 (2) ◽  
pp. 175-184 ◽  
Author(s):  
Zuheir Altamimi ◽  
Claude Boucher ◽  
Patrick Sillard
Keyword(s):  
Reference System ◽  
International Terrestrial Reference System ◽  
Terrestrial Reference System

scholarly journals ITRF2014: A new release of the International Terrestrial Reference Frame modeling nonlinear station motions

2016 ◽  
Vol 121 (8) ◽  
pp. 6109-6131 ◽  
Author(s):  
Zuheir Altamimi ◽  
Paul Rebischung ◽  
Laurent Métivier ◽  
Xavier Collilieux
Keyword(s):  
Reference Frame ◽  
Terrestrial Reference Frame ◽  
International Terrestrial Reference Frame

scholarly journals Determination of the relationship between Vietnam national coordinate reference system (VN-2000) and ITRS, WGS84 and PZ-90

2019 ◽  
Vol 94 ◽  
pp. 03014
Author(s):  
Hoa Pham Thi ◽  
Dung Nghiem Quoc ◽  
Thu Trinh Thi Hoai ◽  
Huynh Pham The ◽  
Nhung Le Thi
Keyword(s):  
Reference System ◽  
Least Square ◽  
National Coordinate ◽  
Least Square Approach ◽  
International Terrestrial Reference System ◽  
Terrestrial Reference System ◽  
The Common ◽  
Transformation Parameters ◽  
The Relationship

In July 2000, Hanoi-72 reference system was replaced by the Vietnam reference system, namely as VN-2000 as an official geodetic background system in Vietnam. Ministry of Natural Resources and Environment of Vietnam has reported the transformation parameters between VN-2000 and WGS84. Nevertheless, there is a need to estimate a new transformation parameter set between VN-2000 and WGS84 because WGS84 has been updated. In addition, there is now a lack of an accurate published set of parameters for transformation from VN-2000 to not only the International Terrestrial Reference System ITRS but also PZ-90. In this study, coordinate transformation parameters between ITRS and VN-2000 are estimated through the use of a least square approach and the common points with known coordinates in both systems. These set of parameters was then deployed to determine the link between VN-2000 and WGS84 as well as PZ-90. The results denoted that the derived transformation parameters, on the basis of the results at the checkpoints, could generated station positions with the accuracy at several cm level for transformation from VN-2000 to the new realizations of ITRS, WGS84 and PZ90 and reversely. These achievements reveals that the set of parameters is great significance for many applications related to positioning in Vietnam.

scholarly journals A Terrestrial Reference System Consistent with WGRS

1991 ◽  
Vol 127 ◽  
pp. 211-214 ◽  
Author(s):  
C. Boucher ◽  
Z. Altamimi
Keyword(s):  
Reference System ◽  
Terrestrial Reference Frame ◽  
Reference Systems ◽  
International Earth Rotation Service ◽  
Earth Orientation Parameters ◽  
Terrestrial Reference System ◽  
Definition Of ◽  
Orientation Parameters ◽  
Evolution With Time

AbstractThe IAU and IUGG has jointly established in 1988 an International Earth Rotation Service (IERS) which is in charge of the realization of conventional celestial and terrestrial reference systems, together with the determination of earth orientation parameters which connect them.The theoretical definition of the terrestrial reference system which is realized by IERS through a conventional terrestrial reference frame formed by SLR, LLR, VLBI and GPS stations is presented. In particular its origin, scale, orientation and evolution with time are reviewed, taking into account relativistic and deformation effects.

scholarly journals Accuracy of the International Terrestrial Reference Frame origin and Earth expansion

2011 ◽  
Vol 38 (13) ◽  
pp. n/a-n/a ◽  
Author(s):  
X. Wu ◽  
X. Collilieux ◽  
Z. Altamimi ◽  
B. L. A. Vermeersen ◽  
R. S. Gross ◽  
...  
Keyword(s):  
Reference Frame ◽  
Terrestrial Reference Frame ◽  
International Terrestrial Reference Frame

Impact of loading effects on determination of the International Terrestrial Reference Frame

2010 ◽  
Vol 45 (1) ◽  
pp. 144-154 ◽  
Author(s):  
Xavier Collilieux ◽  
Zuheir Altamimi ◽  
David Coulot ◽  
Tonie van Dam ◽  
Jim Ray
Keyword(s):  
Reference Frame ◽  
Terrestrial Reference Frame ◽  
International Terrestrial Reference Frame ◽  
Loading Effects

scholarly journals KALREF-A Kalman filter and time series approach to the International Terrestrial Reference Frame realization

2015 ◽  
Vol 120 (5) ◽  
pp. 3775-3802 ◽  
Author(s):  
Xiaoping Wu ◽  
Claudio Abbondanza ◽  
Zuheir Altamimi ◽  
T. Mike Chin ◽  
Xavier Collilieux ◽  
...  
Keyword(s):  
Time Series ◽  
Kalman Filter ◽  
Reference Frame ◽  
Terrestrial Reference Frame ◽  
International Terrestrial Reference Frame ◽  
Time Series Approach
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