Atmospheric Impacts on GPS observations in Antarctica

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Atmospheric Impacts on GPS observations in
Antarctica
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Project Work Plan 2002-04

• Facilitate access to GPS observations from
  permanent GPS sites and SCAR GPS epoch campaigns
  for computation of atmospheric delay to GPS
  signals
• Examine the correlation with magnetic storms
• Research impact of differing levels of solar and
  meteorological activity on Antarctic GPS
  observations
• Report on participation in international studies

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Project Work Plan 2002-04

• Report on project findings
• Continue collaboration with Iono_WG of IAG
• Search for existing research (PhD) that is
  currently being conducted may be able to assist
  with data analysis
• Develop recommendations for future GPS
  observations to minimise impact on GPS network
  surveys

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History of Project

• Established at the XXVI SCAR meeting in Tokyo in
  2000
• Aim is to investigate the iononspheric impact on
  the quality of GPS observations in Antarctica
• First results were presented at AGS01 in St
  Petersburg in 2001

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History of Project

• The results of the time series analysis from the
  data of European Permanent Network as well as
  from Antarctic IGS stations were presented in
  Shanghai
• The analyzed data was from the period a few days
  either side of the ionospheric storm on 64DOY2001
  ( came from three Antarctic IGS stations, i.e.
  Davis, Mawson, and Casey)

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History of Project

• The project was extended at XXVII SCAR
• to allow for the processing of additional data
  from other Antarctic stations
• to analyze longer time series of GPS solutions
  together with ionospheric data

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Numerical Experiments

• left hand side of the graph indicates the
  vicinity of 64DOY2001 where took place the
  ionoshperic storm
• area on the right hand side corresponds to a
  series of strong ionospheric disturbances

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Variations of TEC in 2001 for BOGO and DAV1
stations from IONEX files
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• Next slide shows information on periods of
  geomagnetic storms as predicted by IPS
  Geomagnetic Disturbance Warning

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Variations of TEC in October-November 2001 for
BOGO and DAV1 stations from IONEX files
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Time series of GPS solutions for OHIG-MCM4 vector
components, its length and a number of single
differences used for solving a vector
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Time series of TEC for CAS1 from IONEX (a), from
IONO-WG (b), and MAV1-CAS1 vector length (c)
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CONCLUSIONS

• Investigation of atmospheric impact on GPS
  measurements in a new dimension leads toward
• modeling the influence the environmental effects
  and internal errors of GPS system
• correcting GPS solutions with the developed
  models
• more reliable accuracy estimate of GPS solutions
• studying short term variations of the
  environmental effects and internal errors of GPS
  system.

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Future Activities

• The next step of the project concerns the
  analysis of the tropospheric impact on GPS
  solutions obtained from processing GPS data from
  Antarctic stations

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ACKNOWLEDGMENT
The research was supported by the Institute of
Geodesy and Cartography in Warsaw and was
partially financed by the Polish State Committee
for Scientific Research (grants No 9T12E01918,
8T12E05321 and 8T12E04520).