Difference between revisions of "IC SG8"

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<big>'''JSG 0.17: Multi-GNSS theory and algorithms'''</big>
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<big>'''JSG 0.8: Earth System Interaction from Space Geodesy'''</big>
  
Chair: ''Amir Khodabandeh (Australia)''<br>
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Chair: ''S. Jin (China)''<br>
Affiliation:''Comm. 1, 4 and GGOS''
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Affiliation:''Comm. 2, 3 and 4''
  
 
__TOC__
 
__TOC__
 
 
===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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The gravity field and geodetic mass loading reflect mass redistribution and transport in the Earth’s fluid envelope, and in particular interactions between atmosphere, hydrosphere, cryosphere, land surface and the solid Earth due to climate change and tectonics activities, e.g., dynamic and kinematic processes and co-/post-seismic deformation. However, the traditional ground techniques are very difficult to obtain high temporal-spatial resolution information and processes, particularly in Tibet.
 
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With the launch of the Gravity Recovery and Climate Experiment (GRACE) mission since 2002, it was very successful to monitor the Earth’s time-variable gravity field by determining very accurately the relative position of a pair of Low Earth Orbit (LEO) satellites. Therefore, the new generation of the gravity field derived from terrestrial and space gravimetry, provides a unique oppor-tunity to investigate gravity-solid earth coupling, physics and dynamics of the Earth’s interior, and mass flux interaction within the Earth system, together with GPS/InSAR.
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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* To quantify mass transport within the Earth’s fluid envelope and their interaction in the Earth system.
* 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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* To monitor tectonic motions using gravimetry/GPS, including India-Tibet collision, post-glacial uplift and the deformation associated with active tectonic events, such as earthquakes and volcanoes.
* to develop new functional and stochastic models linking the multi-GNSS observations to the positioning and non-positioning parameters,
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* To develop inversion algorithm and theories in a Spherical Earth on gravity field related deformation and gravity-solid Earth coupling, e.g. crust thickness, iso-static Moho undulations, mass loadings and geodynamics.
* 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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* To develop methods to extract a geodynamic signals related to Solid-Earth mantle and/or core and to under-stand the physical properties of the Earth interior and its dynamics from the joint use of gravity data and other geophysical measurements.
* 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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* To analyze and model geodynamic processes from iso-static modelling of gravity and topography data as well as density structure of the Earth’s deep interior.
* 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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* To address mantle viscosity from analyzing post-seismic deformations of large earthquakes and post-glacial rebound (PGR) and to explain the physical relationships between deformation, seismicity, mantle dynamics, litho-spheric rheology, isostatic response, etc.
* to access the compatibility of the real-time multi-GNSS input parameters for positioning and non-positioning products,
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* To achieve these objectives, the IC SG interacts and collaborates with the ICCT and all IAG Commissions.
* 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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* Organization of SG workshop and of conference sessions,
 +
* Participation in related scientific conference and sympo-sia,
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* Supporting contributions to the ICCT activities.
  
 
===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 />''
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'' '''Shuanggen Jin (China), chair'''<br />  
 +
David J. Crossley (USA)<br />
 +
Carla Braitenberg (Italy)<br />
 +
Isabelle Panet (France)<br />
 +
Jacques Hinderer (France)<br />
 +
Séverine Rosat (France)<br />
 +
Tonie M. van Dam (Luxembour)<br />
 +
Urs Marti (Switzerland)<br />
 +
Patrick Wu (Canada)<br />
 +
Isabella Velicogna (USA)<br />
 +
Nico Sneeuw (Germany)<br />''

Revision as of 11:34, 29 June 2012

JSG 0.8: Earth System Interaction from Space Geodesy

Chair: S. Jin (China)
Affiliation:Comm. 2, 3 and 4

Introduction

The gravity field and geodetic mass loading reflect mass redistribution and transport in the Earth’s fluid envelope, and in particular interactions between atmosphere, hydrosphere, cryosphere, land surface and the solid Earth due to climate change and tectonics activities, e.g., dynamic and kinematic processes and co-/post-seismic deformation. However, the traditional ground techniques are very difficult to obtain high temporal-spatial resolution information and processes, particularly in Tibet. With the launch of the Gravity Recovery and Climate Experiment (GRACE) mission since 2002, it was very successful to monitor the Earth’s time-variable gravity field by determining very accurately the relative position of a pair of Low Earth Orbit (LEO) satellites. Therefore, the new generation of the gravity field derived from terrestrial and space gravimetry, provides a unique oppor-tunity to investigate gravity-solid earth coupling, physics and dynamics of the Earth’s interior, and mass flux interaction within the Earth system, together with GPS/InSAR.

Objectives

  • To quantify mass transport within the Earth’s fluid envelope and their interaction in the Earth system.
  • To monitor tectonic motions using gravimetry/GPS, including India-Tibet collision, post-glacial uplift and the deformation associated with active tectonic events, such as earthquakes and volcanoes.
  • To develop inversion algorithm and theories in a Spherical Earth on gravity field related deformation and gravity-solid Earth coupling, e.g. crust thickness, iso-static Moho undulations, mass loadings and geodynamics.
  • To develop methods to extract a geodynamic signals related to Solid-Earth mantle and/or core and to under-stand the physical properties of the Earth interior and its dynamics from the joint use of gravity data and other geophysical measurements.
  • To analyze and model geodynamic processes from iso-static modelling of gravity and topography data as well as density structure of the Earth’s deep interior.
  • To address mantle viscosity from analyzing post-seismic deformations of large earthquakes and post-glacial rebound (PGR) and to explain the physical relationships between deformation, seismicity, mantle dynamics, litho-spheric rheology, isostatic response, etc.
  • To achieve these objectives, the IC SG interacts and collaborates with the ICCT and all IAG Commissions.

Program of activities

  • Organization of SG workshop and of conference sessions,
  • Participation in related scientific conference and sympo-sia,
  • Supporting contributions to the ICCT activities.

Members

Shuanggen Jin (China), chair
David J. Crossley (USA)
Carla Braitenberg (Italy)
Isabelle Panet (France)
Jacques Hinderer (France)
Séverine Rosat (France)
Tonie M. van Dam (Luxembour)
Urs Marti (Switzerland)
Patrick Wu (Canada)
Isabella Velicogna (USA)
Nico Sneeuw (Germany)