[IGSREPORT-16187] Wk 1475 IGS SINEX Combination
IGS SINEX
sinex at geod.nrcan.gc.ca
Wed Apr 30 15:47:39 PDT 2008
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IGS Electronic Report 30 Apr 15:47:41 PDT 2008 Message Number 16187
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Author: R. Ferland, M. Piraszewski
===============================================================
Combined AC solution for GPS week 1475 - 08/04/13 to 08/04/19
===============================================================
1) Contacts:
============
e-mail: rferland at nrcan.gc.ca
Tel: (613)995-4002 (Remi Ferland)
Fax: (613)995-3215
2) Products:
============
All products are available at:
CDDIS (cddis.gsfc.nasa.gov) and SOPAC (garner.ucsd.edu)
igs08P1475.snx Combined weekly solution.
igs08P1475.erp Daily Earth Rotation Parameters.
igs00p03.erp Daily Earth Rotation Parameters since GPS week 860.
IGS08P16.snx Cumulative Combined solution.
igs08P1475.sum This file.
igs08P1475.itr Residuals between the AC and the IGS05 for the RF stations.
igs08P1475.res Residuals between the AC and the Combined Weekly solution.
IGS08P16.res Residuals between the AC and the Cumulative Combined solution.
Where IGSyyPww & igsyyPwwww represent:
yy Last 2 digits of the year
ww week in year yy
wwww GPS week
P GPS technique used
3) Combination Strategy:
========================
The AC solutions are processed using the following procedure:
3-1) The AC solutions are checked/corrected for possible format problems,
station names inconsistencies, etc...
3-2) The AC solutions are unconstrained according to the information provided
in the SOLUTION/APRIORI Block.
3-3) The AC solutions are aligned (using a 7-parameters) and compared to the
IGS05 stations at the current epoch.
ftp://igscb.jpl.nasa.gov/igscb/station/coord/IGS05.snx
3-4) The AC are compared to IGS05, to each other, to the previous week
solution and to the cumulative solution in order to identify and remove
outliers.
3-5) The weekly AC solutions are combined and added to the cumulative
combined solution. The cumulative combination is done to ensures 14
parameters singularity.
The weekly combined solution is aligned to the IGS05 of the current
epoch using a 7-parameters transformation. The singular cumulative
combined solution is aligned to the IGS05 of the reference epoch
using a 14-parameters transformation and the 132 ITRF station positions
and velocities. The IGS05 is a realization of ITRF2005.
For more details, see:
Blewitt, G., C. Boucher and J. Kouba, 1997, Procedure for ITRF continuous
realization, the report of the IGS GB, presented to the IGS Governing
Board Meeting held in San Francisco, Dec. 11.
Kouba, J., J. Ray and M.M. Watkins, IGS Reference Frame Realization, 1998
IGS Analysis Center Workshop Proceedings, European Space Operations
Centre, Darmstadt, Germany.
The combination software was developed at NRCan.
4) Remarks:
===========
ITR = IGS05.snx
igs = igs08P1475.snx
IGS = IGS08P16.snx
MIT = mit14757.snx
mit = mit1475g.snx
BuA = IERS Bulletin A
mit ncl are used to quality control the weekly combination.
gfz ngs excluded from the geocenter estimation (Sec. 5-4).
Solutions with manual station deletion:
From the original solution:
cod SATA X Y Z
emr SATA X Y Z
gfz SATA X Y Z
MIT SATA X Y Z
sio SATA X Y Z
mit SATA X Y Z
After unconstraining:
ngs THU3 URUM YAKT
sio AUCK
4-1) Starting with GPS week 1400, the solutions are aligned to the
IGS05.snx realization of ITRF2005.
4-2) Starting with GPS week 1078, UT1-UTC from IERS Bulletin A
is included in the erp files.
4-3) Starting with GPS week 1412, the accumulated ERP file has been
changed from "igs00p02.erp" to "igs00p03.erp". The main changes
are:
1) Correction of the pole position from IGb00 to IGS05 using the
transformation in:
http://igscb.jpl.nasa.gov/mail/igsmail/2006/msg00178.html
2) Marginal ERP's in GPS week 1161 were replaced by reprocessed
values.
5) Results:
===========
5-1) AC (Variance Factor)^0.5 estimates:
=============================================
The residuals used in the estimation of the Variance Factor
are the differences between the cumulative combined solution
and each AC weekly solution.
SF = (Variance Factor)^0.5 = (Chi^2/dof)^0.5
Final(SF) = Apriori(SF) * Aposteriori(SF)
Solution |# sta| #RF | Apriori(SF)|Aposteriori(SF)| Final(SF)|
---------------|-----|-----|---------------|---------------|---------------|
cod | 177 | 90 | 24.328 | 1.001 | 24.351 |
emr | 66 | 46 | 4.594 | 1.001 | 4.599 |
esa | 116 | 77 | 5.337 | 1.001 | 5.340 |
gfz | 183 | 94 | 16.168 | 1.001 | 16.187 |
jpl | 123 | 69 | 5.364 | 1.001 | 5.371 |
MIT | 250 | 103 | 3.077 | 1.001 | 3.080 |
ngs | 208 | 98 | 31.009 | 1.001 | 31.050 |
sio | 252 | 98 | 2.588 | 1.001 | 2.591 |
mit | 378 | 97 | 1.769 | 1.193 | 2.110 |
ncl | 196 | 102 | 3.984 | 1.001 | 3.988 |
igs | 335 | 102 | 1.227 | 1.000 | 1.227 |
---------------|-----|-----|---------------|---------------|---------------|
5-2) Solution Residuals weighted Average & STD:
====================================================
5-2-1) With respect to the IGS05 stations:
=============================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 90 | -1.0 0.0 -0.1 | 3.0 2.2 8.5 |
emr 46 | -1.4 0.0 0.0 | 4.0 2.4 9.6 |
esa 77 | -0.4 0.0 0.0 | 3.7 2.7 9.4 |
gfz 94 | -0.5 0.0 0.1 | 3.0 2.4 8.2 |
jpl 69 | 0.1 0.0 0.1 | 2.8 3.1 9.7 |
MIT 103 | 0.0 0.2 0.1 | 2.8 2.6 8.2 |
ngs 98 | -0.2 0.1 0.1 | 2.9 2.1 7.3 |
sio 98 | 1.0 0.1 0.3 | 2.9 2.6 8.5 |
mit 97 | -0.2 0.0 0.2 | 2.5 2.2 7.6 |
ncl 102 | -0.2 0.0 0.1 | 1.4 1.3 4.1 |
---------------|---------------------------|---------------------------|
5-2-2) With respect to the Weekly Combination:
=================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 175 | -0.7 0.0 -0.2 | 0.9 0.8 3.1 |
emr 65 | -1.1 0.2 -0.3 | 2.2 1.2 5.9 |
esa 113 | 0.0 -0.2 -0.7 | 2.6 1.5 4.2 |
gfz 181 | -0.2 0.1 0.1 | 0.7 0.8 3.1 |
jpl 121 | 1.0 0.4 0.3 | 1.2 2.5 5.3 |
MIT 219 | 0.1 0.1 0.1 | 0.8 1.0 2.3 |
ngs 194 | 0.1 0.1 -0.2 | 1.1 1.3 3.0 |
sio 245 | 1.3 0.2 -0.1 | 1.0 1.2 3.2 |
mit 329 | -0.2 0.0 0.0 | 0.6 0.5 1.9 |
ncl 193 | 0.1 0.1 0.0 | 1.6 1.4 3.9 |
ITR 101 | 0.2 -0.2 -0.3 | 2.7 2.0 7.3 |
---------------|---------------------------|---------------------------|
5-2-3) With respect to the Cumulative Combination:
=====================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 161 | -0.9 0.2 0.1 | 2.1 1.5 5.3 |
emr 63 | -1.2 0.1 0.2 | 2.8 1.8 8.1 |
esa 103 | -0.2 -0.1 -0.4 | 3.1 2.1 6.6 |
gfz 172 | -0.3 0.2 0.5 | 2.1 1.8 5.6 |
jpl 113 | 0.8 0.5 0.7 | 2.0 2.7 7.1 |
MIT 194 | 0.0 0.2 0.7 | 1.9 1.8 5.1 |
ngs 163 | -0.2 0.2 0.2 | 1.7 1.9 5.3 |
sio 209 | 1.1 0.3 0.3 | 2.0 2.0 5.3 |
mit 246 | -0.4 0.2 0.4 | 2.0 1.5 4.5 |
ncl 183 | -0.2 0.3 0.6 | 1.7 1.8 4.3 |
igs 249 | -0.3 0.2 0.4 | 1.3 1.4 4.1 |
ITR 127 | 0.0 -0.1 -0.1 | 2.6 1.9 7.5 |
---------------|---------------------------|---------------------------|
5-3) 7-Parameters Transformation: AC ----> IGS05.snx
=========================================================
5-3-1) Estimates:
====================
Solution | R X R Y R Z T X T Y T Z SCL |
| (mas) (mas) (mas) (mm) (mm) (mm) (ppb) |
---------------|---------------------------------------------------------------|
cod | -0.001 -0.010 -0.006 0.2 0.3 -0.1 0.01 |
emr | 0.045 0.018 0.021 -1.1 -6.4 4.2 0.13 |
esa | 0.025 -0.013 0.029 3.4 -0.1 0.1 0.06 |
gfz | 0.009 -0.010 0.001 0.6 0.0 0.6 -0.17 |
jpl | -0.022 -0.008 -0.021 3.3 -1.5 8.7 0.20 |
MIT | 0.009 0.010 -0.004 7.4 -7.3 4.6 0.03 |
ngs | -0.073 -0.144 0.032 8.6 -6.1 -2.7 -0.83 |
sio | -0.058 -0.220 0.067 7.5 -1.3 8.4 0.37 |
mit | -0.011 0.008 -0.001 -0.3 -0.1 0.6 0.02 |
ncl | 0.001 0.000 -0.012 4.0 -2.6 2.8 -0.02 |
igs | 0.000 0.000 0.000 0.0 0.0 0.0 -0.04 |
---------------|---------------------------------------------------------------|
5-3-2) STD:
==============
Solution | R X R Y R Z T X T Y T Z SCL |
| (mas) (mas) (mas) (mm) (mm) (mm) (ppb) |
---------------|---------------------------------------------------------------|
cod | 0.042 0.044 0.047 1.1 1.1 1.1 0.17 |
emr | 0.057 0.059 0.066 1.5 1.5 1.5 0.24 |
esa | 0.043 0.047 0.050 1.2 1.2 1.2 0.18 |
gfz | 0.041 0.042 0.046 1.1 1.1 1.1 0.17 |
jpl | 0.049 0.052 0.052 1.3 1.3 1.3 0.20 |
MIT | 0.040 0.041 0.044 1.1 1.1 1.0 0.16 |
ngs | 0.041 0.042 0.045 1.1 1.1 1.1 0.17 |
sio | 0.041 0.042 0.045 1.1 1.1 1.1 0.17 |
mit | 0.041 0.042 0.046 1.1 1.1 1.1 0.17 |
ncl | 0.040 0.041 0.044 1.1 1.1 1.0 0.16 |
igs | 0.000 0.000 0.000 0.0 0.0 0.0 0.36 |
---------------|---------------------------------------------------------------|
5-4) Geocenter:
====================
| X Y Z | s X s Y s Z |
| (mm) (mm) (mm) | (mm) (mm) (mm) |
---------------|---------------------------|---------------------------|
igs | 5.3 -1.8 4.2 | 1.9 1.9 2.7 |
---------------|---------------------------|---------------------------|
5-5) ERP Residuals Weighted Average & STD:
===============================================
5-5-1) Weighted Average:
===========================
Solution | UT LOD XPO XPOR YPO YPOR |
| us us .01mas .01ma/d .01mas .01ma/d |
---------------|------------------------------------------------------------|
cod | --- --- --- --- --- --- |
emr | --- -6.5 1.1 8.7 1.7 10.6 |
esa | --- 17.5 -1.1 13.5 -3.4 -4.5 |
gfz | --- 4.9 -1.1 -2.3 1.0 -5.7 |
jpl | --- 1.0 0.2 7.9 -3.8 16.8 |
MIT | --- -9.2 2.0 -9.5 -0.4 -4.0 |
ngs | --- 3.9 -0.7 -5.9 0.6 -8.9 |
sio | --- -8.9 3.0 --- 0.3 --- |
mit | --- 7.4 0.8 8.5 0.2 -2.9 |
ncl | --- 11.4 0.5 --- 1.9 --- |
ITR | --- --- --- --- --- --- |
BuA | --- 9.8 0.8 9.5 -2.4 -3.1 |
---------------|------------------------------------------------------------|
5-5-2) STD:
==============
Solution | UT LOD XPO XPOR YPO YPOR |
| us us .01mas .01ma/d .01mas .01ma/d |
---------------|------------------------------------------------------------|
cod | --- --- --- --- --- --- |
emr | --- 4.1 1.4 11.7 0.4 9.8 |
esa | --- 9.4 2.3 4.9 2.6 8.0 |
gfz | --- 5.3 1.7 2.7 1.2 12.2 |
jpl | --- 3.5 1.5 19.8 2.4 16.9 |
MIT | --- 2.6 1.4 8.1 1.9 7.0 |
ngs | --- 9.4 6.8 13.3 3.0 12.6 |
sio | --- 3.2 2.3 --- 1.0 --- |
mit | --- 3.4 2.3 7.8 1.0 6.3 |
ncl | --- 2.8 0.7 --- 0.9 --- |
ITR | --- --- --- --- --- --- |
BuA | --- 11.9 4.1 6.8 4.8 6.8 |
---------------|------------------------------------------------------------|
5-6) Satellite Antenna Offset Residuals weighted Average & STD:
====================================================================
No Satellite phase center ...
5-7) Outliers:
===================
Thresholds set at 5 sigmas and 50 mm.
Solution Solution | Station | N E U |
Minus |code id soln| (mm) (mm) (mm)|
-----------------------------------------|------------|-----------------------|
| | |
ITRF_IGS05.snx mit1475g.snx |CAS1 A 3| 0.4 0.7 -19.9|
ITRF_IGS05.snx mit1475g.snx |GUAM A 4| -9.2 -3.1 -0.6|
ITRF_IGS05.snx mit1475g.snx |PDEL A 1| -8.1 -2.0 -9.9|
ITRF_IGS05.snx mit1475g.snx |PIE1 A 1| -7.4 5.4 13.3|
| | |
igs08P1474.snx ncl1475g.snx |HRAO A 2| 10.6 7.4 1.9|
igs08P1474.snx ncl1475g.snx |MAC1 A 7| -9.8 -2.4 6.7|
| | |
IGS08P15.snx gfz14757.snx |NIUM A 1| -18.9 32.0 6.6|
| | |
IGS08P15.snx MIT14757.snx |DNRC A 1| -1.6 -14.1 -5.2|
IGS08P15.snx MIT14757.snx |LASC A 2| -14.1 2.2 0.9|
| | |
IGS08P15.snx mit1475g.snx |MADR A 1| -19.8 -27.3 -19.6|
IGS08P15.snx mit1475g.snx |NIUM A 1| -19.0 31.5 5.0|
| | |
IGS08P15.snx mit1475g.snx |DNRC A 1| -1.9 -14.8 -4.4|
| | |
IGS08P15.snx ncl1475g.snx |PETP A 4| 9.9 -4.2 -8.1|
| | |
igs08P1475.snx ncl1475g.snx |YSSK A 3| -0.7 9.3 -0.4|
| | |
IGS08P15.snx igs08P1475.snx |REYK A 3| 2.2 -3.5 18.5|
| | |
IGS08P16.snx igs08P1475.snx |THU3 A 1| 14.7 -1.9 -16.7|
-----------------------------------------|------------|-----------------------|
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