combination of the analysis centers reprocessed “sinex” solutions
DESCRIPTION
Combination of the Analysis Centers Reprocessed “SINEX” Solutions. R émi Ferland Geodetic Survey Division. Contents. Introduction Procedure Network Products Coordinates ERP’s Apparent Geocenter Summary. Introduction. Main Objective: - PowerPoint PPT PresentationTRANSCRIPT
IGS08, Miami, June 2-6, 2008
Combination of the Analysis Centers Reprocessed “SINEX” Solutions
Rémi Ferland
Geodetic Survey Division
IGS08, Miami, June 2-6, 2008
Contents
• Introduction
• Procedure
• Network
• Products• Coordinates
• ERP’s
• Apparent Geocenter
• Summary
IGS08, Miami, June 2-6, 2008
Introduction
• Main Objective:• Better meet users requirements by providing more consistent
products.
• Current Contributors (6 ACs / 5 included):• es1 European Space Operations Center, ESA,
Germany • gf1 GeoForschungsZentrum, Germany• mi1 Massachusetts Institute of Technology, USA • ng1 National Oceanic and Atmospheric
Administration / NGS, USA • pd1 GFZ Potsdam/IPG Dresden, Germany• si1 (not included) Scripps Institution of
Oceanography, USA,
IGS08, Miami, June 2-6, 2008
Procedure
• Used results of the test period (1042-1060)– Updated as needed
• Backward ( 2007 - 1994 )• Cumulative solution initialized:
– Use Modified Wk 1460:• Deweighted (x100)• Removed marginal stations
– At the beginning Not “Steady State”
• Rejection Criterion at 8 sigmas
IGS08, Miami, June 2-6, 2008
ACs Network
#ACs Reference Frame
Stations
Total Network Stations
1 0 152
2 1 71
3 10 52
4 25 42
5 92 108
AC Reference Frame
Stations
Total Network Stations
es1 126 257
gf1 109 184
mi1 127 305
ng1 122 250
pd1 108 162
OverlapUsage
IGS08, Miami, June 2-6, 2008ACs Coordinates Residuals
Avg. & Std. w.r.t. IGS05
H
N
E
Avg
. (m
m)
Std
. (m
m)
Consistency:N&E ~2-3mm
H ~ 8mm
Scale=3x
IGS08, Miami, June 2-6, 2008ACs Coordinates Residuals
Avg. & Std. w.r.t. IGS Weekly
H
N
E
Avg
. (m
m)
Std
. (m
m)
Consistency:N&E ~1-2mm
H ~ 3mm
IGS08, Miami, June 2-6, 2008ACs Coordinates Residuals
Avg. & Std. w.r.t. IGS Cumulative
H
N
E
Avg
. (m
m)
Std
. (m
m)
Consistency:N&E ~ 2mm
H ~ 5mm
Scale=2x
Reprocessing
IGS08, Miami, June 2-6, 2008
Z
X
Y
Res
. (m
m)
Std
. (m
m)
ACs Apparent Geocenter Residuals and Standard Deviation
Excluded:gf1
Scale=2x
Consistency:X&Y ~ 3-4mm H ~ 7mm
IGS08, Miami, June 2-6, 2008ACs ERPs Average Weekly
Residuals w.r.t. the IGS combinedLOD Xp
Xpr
Yp
YprConsistency:LOD ~ 10us[XY]p ~ 0.02-0.03mas[XY]pr ~ 0.08-0.10mas/d
Excluded:pd1 LOD [XY]p, [XY]pr(Under Review)
IGS08, Miami, June 2-6, 2008Difference Between
IGS ERPs and Bulletin ALOD Xp
Xpr
Yp
YprLOD
(us)
X0.01mas
Y0.01.as
Xr0.01mas/d
Yr0.01mas/d
Avg. -2 -4 4 -5 -1
Std. 18 6 5 12 15
Bull. A Pole Position Interpolated to mid-dayBull. A Pole Rate estimated from pole position
IGS08, Miami, June 2-6, 2008
Summary (1/3)
• 5 ACs
• Network: All stations : Weekly ~275; Total ~425 Reference Frame Stations: 105 – 115
• Some AC Parameters Excluded ERPs : pd1 Geocenter : gf1
IGS08, Miami, June 2-6, 2008
Summary (2/3)
• ACs Coordinates Consistency w.r.t.: IGS05 (N-E ~ 2-3 mm, H ~ 8 mm) IGS Weekly (N-E ~ 1-2 mm, H ~ 3 mm) IGS Cumulative (N-E ~ 2 mm, H ~ 5 mm)
• ACs ERPs Consistency: LOD ~ 10us ( [XY]p ~ 0.02-0.03 mas; [XY]pr ~ 0.08-0.10mas/d)
• Bull. A & IGS ERPs: LOD -2 ± 18us ( Xp&Yp -4&4 ±6 mas; Xpr&Ypr -5&-1 ± 15mas/d)
• ACs Geocenter Consistency: X & Y ~3-4 mm Z ~ 7mm