Thessaloniki Continuous Reference GPS Station: Initial Estimation of Position

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Thessaloniki Continuous Reference GPS Station
Initial Estimation of Position

• P.Savvaidis, I. Ifadis, K. Lakakis
• Laboratory of Geodesy
• Department of Civil Engineering
• Aristotle University of Thessaloniki

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P.Savvaidis, I. Ifadis, K. Lakakis Thessaloniki
Continuous Reference GPS StationInitial
Estimation of Position

• Established Autumn 1999 at the facilities of the
  Laboratory of Geodesy
• Continuous 24h operation since February 2000

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P.Savvaidis, I. Ifadis, K. Lakakis Thessaloniki
Continuous Reference GPS StationInitial
Estimation of Position

• Ashtech Z-12 Continuous Reference Receiver
• Choke-Ring Antenna
• Ashtech Geodetic Base Station Software (GBSS)

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P.Savvaidis, I. Ifadis, K. Lakakis Thessaloniki
Continuous Reference GPS StationInitial
Estimation of Position

• To be used for
• Geodynamical applications
• As a Reference GPS Station for surveying in the
  area of Thessaloniki

• RTCM corrections transmitted for Real Time
  Kinematic GPS applications, emphasis given to
  vehicle navigation in the area of greater
  Thessaloniki

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P.Savvaidis, I. Ifadis, K. Lakakis Thessaloniki
Continuous Reference GPS StationInitial
Estimation of Position

• The seismic area of Volvi (near Thessaloniki)
• 1978 earthquake

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P.Savvaidis, I. Ifadis, K. Lakakis Thessaloniki
Continuous Reference GPS StationInitial
Estimation of Position

• Control network with terrestrial observations
  (1978 - 1985)

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P.Savvaidis, I. Ifadis, K. Lakakis Thessaloniki
Continuous Reference GPS StationInitial
Estimation of Position

• GPS measurements in a larger area, incl.
  Thessaloniki (1994, 1997)
• Permanent monitoring GPS Array under development
  (2001)

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P.Savvaidis, I. Ifadis, K. Lakakis Thessaloniki
Continuous Reference GPS StationInitial
Estimation of Position
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P.Savvaidis, I. Ifadis, K. Lakakis Thessaloniki
Continuous Reference GPS StationInitial
Estimation of Position

• UHF Radio Network for RTCM corrections
  transmission
• Control Station for Vehicle Navigation
  applications

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P.Savvaidis, I. Ifadis, K. Lakakis Thessaloniki
Continuous Reference GPS StationInitial
Estimation of Position

• Initial Estimation of Position
• ITRF97 coordinates
• IGS Stations ONSALA, HERS, GLSV, GRAZ, MAD2,
  SFER, NOTO, CAGLIARI, MEDICINA, MATERA, SOFI,
  TUBI, ZECK, NICO, RAMO, (TUC1)
• Adjustment 42.8 mm (Horiz. Std.Dev.)
• 36.5 mm (Vert. Std. Dev.)
  

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P.Savvaidis, I. Ifadis, K. Lakakis Thessaloniki
Continuous Reference GPS StationInitial
Estimation of Position

• Adjustment using stations NOTO, MATERA, SOFI,
  NICO
• ITRF97 coordinates
• Raw data March 2000
• 14.2 mm (Horiz. Std.Dev.)
• 12.9 mm (Vert. Std. Dev.)

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P.Savvaidis, I. Ifadis, K. Lakakis Thessaloniki
Continuous Reference GPS StationInitial
Estimation of Position

• Adjustment using stations NOTO, MATERA, SOFI,
  NICO
• ITRF97 coordinates updated March 2000
• Raw data March 2000
• 10.7 mm (Horiz. Std.Dev.)
• 9.4 mm (Vert. Std. Dev.)

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P.Savvaidis, I. Ifadis, K. Lakakis Thessaloniki
Continuous Reference GPS StationInitial
Estimation of Position

• Coordinates of THES1
• ITRF97
• X4463666.690 m 7.8 mm
• Y1890982.232 m 8.6 mm
• Z4131185.946 m 5.0 mm
• ITRF97 (upd. 3/2000)
• X4463666.641 m 7.9 mm
• Y1890982.281 m 8.6 mm
• Z4131185.980 m 5.0 mm
• Differences
• DX -0.049 m DY 0.049 m DZ 0.034 m