[IGSREPORT-16587] Wk 1493 IGS SINEX Combination
IGS SINEX
sinex at geod.nrcan.gc.ca
Wed Sep 3 14:50:26 PDT 2008
******************************************************************************
IGS Electronic Report 03 Sep 14:50:28 PDT 2008 Message Number 16587
******************************************************************************
Author: R. Ferland, M. Piraszewski
===============================================================
Combined AC solution for GPS week 1493 - 08/08/17 to 08/08/23
===============================================================
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)
igs08P1493.snx Combined weekly solution.
igs08P1493.erp Daily Earth Rotation Parameters.
igs00p03.erp Daily Earth Rotation Parameters since GPS week 860.
IGS08P34.snx Cumulative Combined solution.
igs08P1493.sum This file.
igs08P1493.itr Residuals between the AC and the IGS05 for the RF stations.
igs08P1493.res Residuals between the AC and the Combined Weekly solution.
IGS08P34.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 = igs08P1493.snx
IGS = IGS08P34.snx
MIT = mit14937.snx
mit = mit1493g.snx
BuA = IERS Bulletin A
grg mit ncl are used to quality control the weekly combination.
gfz 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:
esa SELE
MIT KJUN UNSA
sio AUCK
grg FAIR NTUS YSSK
mit KJUN KUUJ
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 | 197 | 86 | 19.063 | 1.000 | 19.064 |
emr | 66 | 42 | 4.966 | 1.000 | 4.966 |
esa | 114 | 60 | 4.119 | 1.000 | 4.119 |
gfz | 199 | 89 | 13.354 | 1.000 | 13.354 |
jpl | 129 | 67 | 5.324 | 0.997 | 5.310 |
MIT | 256 | 96 | 2.151 | 1.000 | 2.152 |
ngs | 229 | 95 | 33.307 | 1.000 | 33.307 |
sio | 228 | 91 | 2.291 | 1.000 | 2.291 |
grg | 79 | 50 | 13.542 | 1.000 | 13.542 |
mit | 374 | 92 | 1.744 | 1.000 | 1.744 |
ncl | 218 | 95 | 0.714 | 0.999 | 0.714 |
igs | 326 | 97 | 1.558 | 0.999 | 1.556 |
---------------|-----|-----|---------------|---------------|---------------|
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 86 | 1.3 0.0 0.0 | 2.7 3.0 8.7 |
emr 42 | 1.5 0.0 -0.1 | 3.4 3.1 11.4 |
esa 60 | 0.9 0.0 0.0 | 3.2 3.2 11.0 |
gfz 89 | 1.5 0.0 -0.1 | 2.7 3.1 9.8 |
jpl 67 | 1.5 -0.1 1.2 | 2.9 3.3 11.0 |
MIT 96 | 1.4 0.2 0.3 | 2.7 3.0 9.1 |
ngs 95 | 2.2 0.1 -0.1 | 2.8 3.0 8.3 |
sio 91 | 1.2 0.2 0.0 | 2.9 3.0 7.5 |
grg 50 | 1.2 0.1 0.1 | 2.4 1.2 7.8 |
mit 92 | 1.6 0.1 0.4 | 2.5 2.7 8.1 |
ncl 95 | 1.0 0.1 0.3 | 2.7 3.2 10.6 |
---------------|---------------------------|---------------------------|
5-2-2) With respect to the Weekly Combination:
=================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 194 | 0.1 0.2 -0.8 | 1.1 1.1 3.0 |
emr 65 | -0.4 -0.4 -0.3 | 2.2 1.2 5.0 |
esa 114 | -0.4 0.1 -1.5 | 1.8 1.6 4.6 |
gfz 195 | 0.4 0.0 -0.6 | 0.7 0.7 2.6 |
jpl 128 | 0.3 0.0 1.4 | 1.4 2.1 6.3 |
MIT 229 | 0.0 0.2 0.3 | 0.7 0.8 2.0 |
ngs 214 | 0.8 0.2 -0.9 | 1.1 2.2 3.6 |
sio 225 | 0.0 0.1 0.4 | 1.3 1.1 3.7 |
grg 78 | 0.1 -0.3 1.5 | 2.3 3.4 7.1 |
mit 320 | 0.5 0.0 0.1 | 0.5 0.4 1.2 |
ncl 212 | -0.5 0.1 0.3 | 1.2 1.4 5.2 |
ITR 96 | -1.2 -0.1 0.1 | 2.4 2.6 8.2 |
---------------|---------------------------|---------------------------|
5-2-3) With respect to the Cumulative Combination:
=====================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 180 | 0.9 0.3 -0.8 | 1.6 1.7 5.3 |
emr 63 | 0.5 -0.4 -0.2 | 2.7 2.1 7.2 |
esa 107 | 0.4 0.2 -1.2 | 2.1 2.3 7.2 |
gfz 184 | 1.1 0.1 -0.5 | 1.4 1.7 5.7 |
jpl 117 | 1.1 0.1 1.1 | 2.0 2.6 7.8 |
MIT 203 | 0.9 0.2 0.5 | 1.3 1.5 5.3 |
ngs 188 | 1.7 0.1 -0.9 | 2.0 2.7 5.7 |
sio 199 | 0.9 0.2 0.0 | 2.2 1.9 4.8 |
grg 77 | 1.0 0.0 0.5 | 2.4 3.2 8.0 |
mit 251 | 1.3 0.1 -0.1 | 1.5 1.4 4.4 |
ncl 202 | 0.3 0.2 0.2 | 1.8 2.1 7.1 |
igs 255 | 0.8 0.1 -0.2 | 1.4 1.3 4.4 |
ITR 127 | -0.4 -0.1 -0.1 | 2.2 2.1 8.2 |
---------------|---------------------------|---------------------------|
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 | -0.007 -0.014 0.003 0.5 0.3 0.5 -0.37 |
emr | 0.065 -0.037 0.038 0.5 -4.6 -6.3 -0.31 |
esa | 0.044 -0.034 0.037 4.5 2.2 -2.4 -0.37 |
gfz | 0.003 -0.043 0.004 1.1 0.3 1.5 -0.72 |
jpl | 0.007 -0.002 -0.009 -7.3 3.4 -3.1 -0.67 |
MIT | 0.006 -0.001 -0.010 2.8 -0.5 4.8 -0.56 |
ngs | 0.030 -0.015 -0.008 2.7 2.6 5.5 -0.31 |
sio | -0.032 -0.025 0.022 -3.1 -0.8 -8.9 -0.16 |
grg | -0.029 -0.025 -0.006 4.8 1.9 7.9 -0.32 |
mit | -0.011 -0.009 0.001 -0.5 0.1 -1.5 -0.52 |
ncl | 0.025 -0.025 0.024 1.0 0.8 0.6 -0.56 |
igs | 0.000 0.000 0.000 0.0 0.0 0.0 -0.42 |
---------------|---------------------------------------------------------------|
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 | 0.043 0.046 0.047 1.2 1.1 1.1 0.18 |
emr | 0.059 0.062 0.072 1.6 1.6 1.6 0.25 |
esa | 0.049 0.054 0.056 1.3 1.3 1.3 0.21 |
gfz | 0.042 0.044 0.046 1.1 1.1 1.1 0.17 |
jpl | 0.048 0.051 0.053 1.3 1.3 1.3 0.20 |
MIT | 0.041 0.043 0.045 1.1 1.1 1.1 0.17 |
ngs | 0.041 0.044 0.045 1.1 1.1 1.1 0.17 |
sio | 0.042 0.045 0.046 1.1 1.1 1.1 0.17 |
grg | 0.054 0.057 0.067 1.5 1.5 1.5 0.23 |
mit | 0.042 0.044 0.046 1.1 1.1 1.1 0.17 |
ncl | 0.041 0.043 0.046 1.1 1.1 1.1 0.17 |
igs | 0.000 0.000 0.000 0.0 0.0 0.0 0.20 |
---------------|---------------------------------------------------------------|
5-4) Geocenter:
====================
| X Y Z | s X s Y s Z |
| (mm) (mm) (mm) | (mm) (mm) (mm) |
---------------|---------------------------|---------------------------|
igs | 1.2 1.9 1.2 | 1.1 0.7 2.4 |
---------------|---------------------------|---------------------------|
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 | --- -5.9 0.8 31.2 -5.0 -7.8 |
esa | --- 6.9 -2.5 13.9 -0.5 -18.6 |
gfz | --- 6.8 -0.6 10.0 -0.8 7.2 |
jpl | --- 4.4 0.8 18.5 -4.0 17.5 |
MIT | --- -4.7 -1.1 -22.4 0.0 -18.3 |
ngs | --- 11.8 4.8 2.4 7.1 20.7 |
sio | --- 8.3 0.7 --- 0.7 --- |
grg | --- -8.1 0.9 2.7 2.3 8.2 |
mit | --- 13.0 1.4 3.4 0.7 3.8 |
ncl | --- --- --- --- --- --- |
ITR | --- --- --- --- --- --- |
BuA | --- 0.2 0.4 4.8 3.7 3.6 |
---------------|------------------------------------------------------------|
5-5-2) STD:
==============
Solution | UT LOD XPO XPOR YPO YPOR |
| us us .01mas .01ma/d .01mas .01ma/d |
---------------|------------------------------------------------------------|
cod | --- --- --- --- --- --- |
emr | --- 3.8 1.4 7.8 0.8 7.1 |
esa | --- 4.5 1.1 11.5 2.1 8.9 |
gfz | --- 9.1 1.3 5.3 1.7 6.6 |
jpl | --- 7.9 1.3 4.9 1.4 6.5 |
MIT | --- 3.1 1.5 8.2 1.6 4.9 |
ngs | --- 13.8 5.6 6.8 4.9 13.1 |
sio | --- 3.0 2.0 --- 2.0 --- |
grg | --- 37.1 4.1 5.5 3.0 8.5 |
mit | --- 3.1 2.1 6.3 1.9 5.3 |
ncl | --- --- --- --- --- --- |
ITR | --- --- --- --- --- --- |
BuA | --- 14.5 5.4 6.8 2.7 10.1 |
---------------|------------------------------------------------------------|
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 cod14937.snx |CAS1 A 3| 7.7 2.2 -41.0|
| | |
ITRF_IGS05.snx cod14937.snx |OHI2 A 1| 5.2 4.2 -28.4|
ITRF_IGS05.snx cod14937.snx |VESL A 1| 2.6 -3.4 -23.0|
| | |
ITRF_IGS05.snx emr14937.snx |CAS1 A 3| 5.1 3.8 -41.7|
| | |
ITRF_IGS05.snx esa14937.snx |CAS1 A 3| 7.1 3.4 -41.9|
| | |
ITRF_IGS05.snx gfz14937.snx |CAS1 A 3| 6.0 2.8 -41.1|
| | |
ITRF_IGS05.snx MIT14937.snx |CAS1 A 3| 6.8 2.4 -37.5|
| | |
ITRF_IGS05.snx ngs14937.snx |CAS1 A 3| 5.3 4.0 -38.0|
| | |
ITRF_IGS05.snx sio14937.snx |CAS1 A 3| 5.4 3.4 -31.3|
| | |
ITRF_IGS05.snx mit1493g.snx |CAS1 A 3| 6.7 2.5 -37.9|
| | |
ITRF_IGS05.snx mit1493g.snx |KUNM A 2| 9.0 1.9 24.0|
ITRF_IGS05.snx mit1493g.snx |OHI2 A 1| 4.8 3.6 -24.4|
ITRF_IGS05.snx mit1493g.snx |TSKB A 2| 2.0 -8.9 6.2|
| | |
ITRF_IGS05.snx mit1493g.snx |VESL A 1| 1.1 -3.5 -19.5|
| | |
ITRF_IGS05.snx ncl1493g.snx |CAS1 A 3| 5.9 4.7 -42.6|
ITRF_IGS05.snx ncl1493g.snx |KARR A 1| -1.6 0.2 23.4|
| | |
IGS08P33.snx cod14937.snx |MOBJ A 1| 0.9 0.6 29.7|
| | |
IGS08P33.snx igs08P1493.snx |HNPT A 3| 1.5 6.4 -5.2|
IGS08P33.snx igs08P1493.snx |NISU A 1| 7.8 4.2 1.9|
IGS08P33.snx igs08P1493.snx |TSKB A 2| 2.2 -7.1 14.2|
-----------------------------------------|------------|-----------------------|
More information about the IGSREPORT
mailing list