Difference between pages "JSG T.30" and "JSG T.34"

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(Created page with "<big>'''JSG 0.17: Multi-GNSS theory and algorithms'''</big> Chair: ''Amir Khodabandeh (Australia)''<br> Affiliation:''Comm. 1, 4 and GGOS'' __TOC__ ===Introduction=== In r...")
 
 
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<big>'''JSG 0.17: Multi-GNSS theory and algorithms'''</big>
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<big>'''JSG 0.21: Geophysical modelling of time variations in deformation and gravity'''</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:''Comm. 2 and 3''
  
 
__TOC__
 
__TOC__
  
===Introduction===
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===Terms of Reference===
  
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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In recent years, observational accuracy of ground-, satellite- and space-geodetic techniques has significantly improved which enables us to monitor temporal variations in surface deformations and gravity over various space and time scales. These variations are related to a wide range of surface and internal Earth’s processes, including the deformational response to glacial loading, solid earth and ocean tides, atmospheric and non-tidal ocean loadings, hydrological phenomena, earthquake and volcano activity, tsunamis from seismic to GIA-process frequencies. The interpretation of such high-accuracy observational data, more advanced theories are required in order to describe the individual processes and to quantify the individual signals in the geodetic data. To facilitate this, interactions between geophysical modelling and data modelling is mandatory.
 
 
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.
 
  
 
===Objectives===
 
===Objectives===
  
The main objectives of this study group are:
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* Development of 1-D, 2-D, and 3-D elastic/anelastic Earth models for simulating the individual processes causing variations in deformation and gravity.
* 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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* Development of phenomenological or dynamic theories to treat deformation and gravity variations which cannot be described by the above earth models (e.g., hydrology, cryosphere, poroelasticity) and consideration of such effects in the above earth models.
* to develop new functional and stochastic models linking the multi-GNSS observations to the positioning and non-positioning parameters,
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* Theoretical study to reveal the mechanisms of the individual processes.
* 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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* Comparative study of theoretical methods using the existing codes.
* 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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* Forward and inverse modelling of deformation and gravity variations using observational data.
* 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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* Development of observational data analysis methods to extract the individual geophysical signals.
* to access the compatibility of the real-time multi-GNSS input parameters for positioning and non-positioning products,
 
* to articulate the theoretical developments and findings through the journals and conference proceedings.
 
  
 
===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.
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* To open a web page to share publication lists and its update.
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* To hold an international workshop focusing on the above research theme.
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* To have sessions at international meetings (EGU, AGU, IAG, etc.) as needed.
  
===Members===
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===Membership===
  
'' '''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 />''
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'' '''Sten Claessens (Australia), chair''' <br /> Zdeněk Martinec (Ireland) <br /> Erik Ivins (USA) <br /> Volker Klemann (Germany) <br /> Johannes Bouman (Germany) <br /> Jose Fernandez (Spain) <br /> Luce Fleitout (France) <br /> Pablo Jose Gonzales (UK) <br /> David Al-Attar (UK) <br /> Giorgio Spada (Italy) <br /> Gabriele Cambiotti (Italy) <br /> Peter Vajda (Slovak Republic) <br /> Wouter van der Wal (Netherlands) <br /> Riccardo Riva (Netherlands) <br /> Taco Broerse (Netherlands) <br /> Shin-Chan Han (Australia) <br /> Guangyu Fu (China) <br /> Benjamin Fong Chao (Taiwan) <br /> Jun'ichi Okuno (Japan) <br /> Masao Nakada (Japan) <br />''

Revision as of 09:20, 29 April 2016

JSG 0.21: Geophysical modelling of time variations in deformation and gravity

Chair: Yoshiyuki Tanaka (Japan)
Affiliation:Comm. 2 and 3

Terms of Reference

In recent years, observational accuracy of ground-, satellite- and space-geodetic techniques has significantly improved which enables us to monitor temporal variations in surface deformations and gravity over various space and time scales. These variations are related to a wide range of surface and internal Earth’s processes, including the deformational response to glacial loading, solid earth and ocean tides, atmospheric and non-tidal ocean loadings, hydrological phenomena, earthquake and volcano activity, tsunamis from seismic to GIA-process frequencies. The interpretation of such high-accuracy observational data, more advanced theories are required in order to describe the individual processes and to quantify the individual signals in the geodetic data. To facilitate this, interactions between geophysical modelling and data modelling is mandatory.

Objectives

  • Development of 1-D, 2-D, and 3-D elastic/anelastic Earth models for simulating the individual processes causing variations in deformation and gravity.
  • Development of phenomenological or dynamic theories to treat deformation and gravity variations which cannot be described by the above earth models (e.g., hydrology, cryosphere, poroelasticity) and consideration of such effects in the above earth models.
  • Theoretical study to reveal the mechanisms of the individual processes.
  • Comparative study of theoretical methods using the existing codes.
  • Forward and inverse modelling of deformation and gravity variations using observational data.
  • Development of observational data analysis methods to extract the individual geophysical signals.

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 publication lists and its update.
  • To hold an international workshop focusing on the above research theme.
  • To have sessions at international meetings (EGU, AGU, IAG, etc.) as needed.

Membership

Sten Claessens (Australia), chair
Zdeněk Martinec (Ireland)
Erik Ivins (USA)
Volker Klemann (Germany)
Johannes Bouman (Germany)
Jose Fernandez (Spain)
Luce Fleitout (France)
Pablo Jose Gonzales (UK)
David Al-Attar (UK)
Giorgio Spada (Italy)
Gabriele Cambiotti (Italy)
Peter Vajda (Slovak Republic)
Wouter van der Wal (Netherlands)
Riccardo Riva (Netherlands)
Taco Broerse (Netherlands)
Shin-Chan Han (Australia)
Guangyu Fu (China)
Benjamin Fong Chao (Taiwan)
Jun'ichi Okuno (Japan)
Masao Nakada (Japan)