Difference between revisions of "JSG T.30"

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<big>'''JSG T.30: Multi-GNSS theory and algorithms'''</big>
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<big>'''JSG T.30: Dynamic modeling of deformation, rotation and gravity field variations'''</big>
  
Chair: ''Amir Khodabandeh (Australia)''<br>
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Chair: ''Yoshiyuki Tanaka (Japan)''<br>
Affiliation:''Comm. 1, 4 and GGOS''
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Affiliation:''Commissions 2 and 3, GGOS''
  
 
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===Introduction===
 
===Introduction===
  
In recent years, we are witnessing rapid development in the satellite-based navigation and positioning systems. Next to the modernization of the GPS dual-frequency signals to the triple-frequency signals, the GLONASS satellites have been revitalized and become fully operational. The new global and regional satellite constellations are also joining the family of the navigation systems. These additions are the two global systems of Galileo and BeiDou satellites as well as the two regional systems of QZSS and IRNSS satellites. This namely means that many more satellites will be visible to the GNSS users, transmitting data on many more frequencies than the current GPS dual-frequency setup, thereby expecting considerable improvement in the performance of the positioning and non-positioning GNSS applications.
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Advancements in the Global Geodetic Observation System (GGOS), and terrestrial, aerial and marine geodetic observations have enabled us to monitor deformation, rotation and gravity field variations of the Earth with the unprecedented accuracy, which are caused by geophysical phenomena having various space-time scales. In addition, recent developments of global networks for solid-Earth observations and technologies for laboratory experiments have allowed us to obtain higher-quality and finer-resolution geophysical data for elasticity, density, viscosity, pressure, electromagnetic and thermal structures, etc., reflecting three dimensional heterogeneities in the internal Earth.  
  
Such a proliferation of multi-system, multi-frequency data demands rigorous theoretical frameworks, models and algorithms that enable the near-future multiple GNSSs to serve as a high-accuracy and high-integrity tool for the Earth-, atmospheric- and space-sciences. For instance, recent studies have revealed the existence of non-zero inter-system and inter-system-type biases that, if ignored, result in a catastrophic failure of integer ambiguity resolution, thus deteriorating the corresponding ambiguity resolved solutions. The availability of the new multi-system, multi-frequency data does therefore appeal proper mathematical models so as to enable one to correctly integrate such data, thus correctly linking the data to the estimable parameters of interest.
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The improved geodetic and geophysical data motivate us to interpret the various phenomena, based on dynamic modelling. Through the modelling, we are able to identify the causes of the detected space-time variations and to deepen the understanding of the phenomena. Furthermore, it would help appeal the usefulness of GGOS.
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This JSG consists of scientists working on dynamic modelling using diverse approaches. The targets of the modelling include local, regional and global variations which occur near the surface down to the inner core. To share different perspectives for modelling stimulates the activities of each member and can produce and/or evolve collaborative studies. For which reason, we form a forum within the ICCT.  
  
 
===Objectives===
 
===Objectives===
  
The main objectives of this study group are:
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* Development/improvement of forward modelling:  
* to identify and investigate challenges that are posed by processing and integrating the data of the next generation navigation and positioning satellite systems,
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** Natural phenomena: earthquake, volcano, plate motion, surface fluids, glacial isostatic adjustment (GIA), tides and Earth rotation, etc.
* to develop new functional and stochastic models linking the multi-GNSS observations to the positioning and non-positioning parameters,
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** Properties of the Earth structure to be modelled: elasticity, viscoelasticity, plasticity, poroelasticity, electromagnetic, thermal and chemical properties, heterogeneities and anisotropies in the Earth structure, etc.
* to derive optimal methods that are capable of handling the data-processing of large-scale networks of mixed-receiver types tracking multi-GNSS satellites,
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** Modelling approaches: analytical, semi-analytical and fully numerical methods and associated approximation methods, etc.
* to conduct an in-depth analysis of the systematic satellite- and receiver-dependent biases that are present either within one or between multiple satellite systems,
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** Comparison between different theories.
* to develop rigorous quality-control and integrity tools for evaluating the reliability of the multi-GNSS data and guarding the underlying models against any mis-modelled effects,
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** Opening developed software (if possible).
* to access the compatibility of the real-time multi-GNSS input parameters for positioning and non-positioning products,
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* Development or improvement of inversion and simulation methods:
* to articulate the theoretical developments and findings through the journals and conference proceedings.
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** Integration of diverse data.
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** Effective processing of a large quantity of data.
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** Data assimilation.
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** Application of various theories to real observations for new scientific findings.
  
 
===Program of activities===
 
===Program of activities===
  
While the investigation will be strongly based on the theoretical aspects of the multi-GNSS observation modelling and challenges, they will be also accompanied by numerical studies of both the simulated and real-world data. Given the expertise of each member, the underlying studies will be conducted on both individual and collaborative bases. The outputs of the group study is to provide the geodesy and GNSS communities with well-documented models and algorithmic methods through the journals and conference proceedings.
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* To launch an e-mail list to share information concerning research results and to interchange ideas for solving related problems.
 +
* To open a web page to share information, such as publication lists and its update.
 +
* To promote international workshops focusing on the above research theme.
 +
* To propel collaborations with closely related joint study groups such as geodetic, seismic and geodynamic constraints on glacial isostatic adjustment, cryospheric deformation and assessing impacts of loading on reference frame realizations.
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* To have sessions at international meetings and workshops (EGU, AGU, IAG, Hotine-Marussi Symposium, etc.) as needed.
  
 
===Members===
 
===Members===
  
'' '''Amir Khodabandeh (Australia), chair''' <br /> Peter J.G. Teunissen (Australia) <br /> Pawel Wielgosz (Poland) <br /> Bofeng Li (China) <br /> Simon Banville (Canada) <br /> Nobuaki Kubo (Japan) <br /> Ali Reza Amiri-Simkooei (Iran) <br /> Gabriele Giorgi (Germany) <br /> Thalia Nikolaidou (Canada) <br /> Robert Odolinski (New Zealand) <br />''
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'' '''Yoshiyuki Tanaka (Japan), chair ''' <br /> Shin-Chan Han (Australia) <br /> Taco Broerse (Netherlands) <br /> José Fernández (Spain) <br /> Guangyu Fu (China) <br /> Hom Nath Gharti (USA) <br /> Pablo J. González (Spain) <br /> Cheinway Hwang (Taiwan) <br /> Volker Klemann (Germany) <br /> Zdeněk Martinec (Ireland) <br /> Daniel Melini (Italy) <br /> Anthony Mémin (France) <br /> Craig Miller (New Zealand) <br /> Jun’ichi Okuno (Japan) <br /> Riccardo Riva (Netherlands) <br /> Jeanne Sauber (USA) <br /> Giorgio Spada (Italy) <br /> Peter Vajda (Slovak Republic) <br /> Wouter van der Wal (Netherlands <br />''

Revision as of 11:01, 10 June 2020

JSG T.30: Dynamic modeling of deformation, rotation and gravity field variations

Chair: Yoshiyuki Tanaka (Japan)
Affiliation:Commissions 2 and 3, GGOS

Introduction

Advancements in the Global Geodetic Observation System (GGOS), and terrestrial, aerial and marine geodetic observations have enabled us to monitor deformation, rotation and gravity field variations of the Earth with the unprecedented accuracy, which are caused by geophysical phenomena having various space-time scales. In addition, recent developments of global networks for solid-Earth observations and technologies for laboratory experiments have allowed us to obtain higher-quality and finer-resolution geophysical data for elasticity, density, viscosity, pressure, electromagnetic and thermal structures, etc., reflecting three dimensional heterogeneities in the internal Earth.

The improved geodetic and geophysical data motivate us to interpret the various phenomena, based on dynamic modelling. Through the modelling, we are able to identify the causes of the detected space-time variations and to deepen the understanding of the phenomena. Furthermore, it would help appeal the usefulness of GGOS. This JSG consists of scientists working on dynamic modelling using diverse approaches. The targets of the modelling include local, regional and global variations which occur near the surface down to the inner core. To share different perspectives for modelling stimulates the activities of each member and can produce and/or evolve collaborative studies. For which reason, we form a forum within the ICCT.

Objectives

  • Development/improvement of forward modelling:
    • Natural phenomena: earthquake, volcano, plate motion, surface fluids, glacial isostatic adjustment (GIA), tides and Earth rotation, etc.
    • Properties of the Earth structure to be modelled: elasticity, viscoelasticity, plasticity, poroelasticity, electromagnetic, thermal and chemical properties, heterogeneities and anisotropies in the Earth structure, etc.
    • Modelling approaches: analytical, semi-analytical and fully numerical methods and associated approximation methods, etc.
    • Comparison between different theories.
    • Opening developed software (if possible).
  • Development or improvement of inversion and simulation methods:
    • Integration of diverse data.
    • Effective processing of a large quantity of data.
    • Data assimilation.
    • Application of various theories to real observations for new scientific findings.

Program of activities

  • To launch an e-mail list to share information concerning research results and to interchange ideas for solving related problems.
  • To open a web page to share information, such as publication lists and its update.
  • To promote international workshops focusing on the above research theme.
  • To propel collaborations with closely related joint study groups such as geodetic, seismic and geodynamic constraints on glacial isostatic adjustment, cryospheric deformation and assessing impacts of loading on reference frame realizations.
  • To have sessions at international meetings and workshops (EGU, AGU, IAG, Hotine-Marussi Symposium, etc.) as needed.

Members

Yoshiyuki Tanaka (Japan), chair
Shin-Chan Han (Australia)
Taco Broerse (Netherlands)
José Fernández (Spain)
Guangyu Fu (China)
Hom Nath Gharti (USA)
Pablo J. González (Spain)
Cheinway Hwang (Taiwan)
Volker Klemann (Germany)
Zdeněk Martinec (Ireland)
Daniel Melini (Italy)
Anthony Mémin (France)
Craig Miller (New Zealand)
Jun’ichi Okuno (Japan)
Riccardo Riva (Netherlands)
Jeanne Sauber (USA)
Giorgio Spada (Italy)
Peter Vajda (Slovak Republic)
Wouter van der Wal (Netherlands