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G. Bianco, M. Virelli Agenzia Spaziale Italiana, CGS - Matera
V. Luceri e-GEOS S.p.A., CGS - Matera
C. Sciarretta Telespazio S.p.A., CGS - Matera
16th International Workshop on Laser Ranging, Poznan, 13-17 October 2008
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TRA
NSL
ATIO
NS
SCA
LE
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TX
TY
TZ
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North
East
+X
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where: Xi, , Yi, Zi : X, Y, Z coordinate of the i-th site of the week ni : number of observations of the i-th site of the week Ntot : total number of observations in the week
A weekly time series of the LAGEOS 1/2 data barycenter has been computed, expressed as coordinates (dX,dY,dZ) in the ITRF reference frame.
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1993 2008
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1993
2008
ITRF origin
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1993
2008
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Correlation coefficients scale/X = 0.32 scale/Y = 0.45 scale/Z = 0.06
Data Barycenter
Scale
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mm
meters
Correlation coefficient scale/rXY = 0.45
rXY = distance of the data barycenter from the ITRF origin, in the XY plane (equator)
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mm
meters
Correlation coefficient scale/r = 0.27
r = distance of the data barycenter from the ITRF origin
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• Unbalanced data distribution since 2002
• Possible effect of the longitudinal data distribution on the scale to SLRF2005
• No evidence of the North/South data distribution influence on the scale to SLRF2005
• Further investigations with network simulation to: assess the correlation scale/data barycenter check the reliability of scale estimation