[IGSREPORT-7247] Wk 1063 IGS SINEX Combination
Remi Ferland
ferland at geod.nrcan.gc.ca
Thu Jun 8 13:00:15 PDT 2000
******************************************************************************
IGS Electronic Report 08 Jun 13:00:20 PDT 2000 Message Number 7247
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Author: R. Ferland , D. Hutchison
===================================================================
Combined AC solution for GPS week 1063 - 00/05/21 to 00/05/27
===================================================================
1) Contacts:
============
e-mail: ferland at geod.nrcan.gc.ca
Tel: (613)995-4002 (Remi Ferland)
Fax: (613)995-3215
2) Products:
============
All products are available at cddisa.gsfc.nasa.gov
igs00P1063.snx Combined weekly solution.
igs00P1063.erp Daily Earth Rotation Parameters.
igs00p02.erp Daily Earth Rotation Parameters since GPS week 1013.
IGS00P21.snx Cumulative Combined solution.
igs00P1063.sum This file.
igs00P1063.itr Residuals between the AC and the ITRF97 for the RF stations.
igs00P1063.res Residuals between the AC and the Combined Weekly solution.
IGS00P21.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
ITRF97 Reference Frame (RF) stations at the current epoch.
ftp://igscb.jpl.nasa.gov/igscb/station/coord/ITRF97_IGS_RS51.SNX.Z
3-4) The AC are compared to ITRF, 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 ITRF97 of the current
epoch using a 7-parameters transformation. The singular cumulative
combined solution is aligned to the ITRF97 of the reference epoch
using a 14-parameters transformation and the 51 ITRF station positions
and velocities.
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:
===========
igs = igs00P1063.snx
IGS = IGS00P21.snx
BuA = IERS Bulletin A
ncl are used to quality control the weekly combination.
emr gfz ngs sio excluded from the geocenter estimation (Sec. 5-4).
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 | 116 | 41 | 27.852 | 1.000 | 27.851 |
emr | 41 | 21 | 3.306 | 1.000 | 3.307 |
esa | 53 | 36 | 11.796 | 1.000 | 11.796 |
gfz | 70 | 36 | 24.070 | 1.000 | 24.070 |
jpl | 66 | 35 | 4.392 | 1.000 | 4.392 |
ngs | 70 | 46 | 22.548 | 1.000 | 22.548 |
ncl | 76 | 46 | 2.748 | 1.000 | 2.748 |
igs | 131 | 47 | 1.369 | 1.000 | 1.369 |
---------------|-----|-----|---------------|---------------|---------------|
5-2) Solution Residuals weighted Average & STD :
=====================================================
5-2-1) With respect to ITRF97 Reference Frame stations:
=========================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 40 | -0.8 -0.5 0.8 | 3.1 5.3 11.9 |
emr 20 | -2.6 0.3 2.2 | 5.9 6.3 15.3 |
esa 35 | -0.5 0.2 -1.7 | 6.8 7.1 12.6 |
gfz 35 | 0.2 0.3 -0.1 | 5.4 6.1 12.4 |
jpl 34 | -1.0 0.4 2.1 | 4.4 4.5 12.7 |
ngs 45 | -1.6 1.1 0.3 | 6.8 11.3 12.5 |
ncl 45 | 0.4 0.3 0.4 | 3.4 4.1 6.5 |
---------------|---------------------------|---------------------------|
5-2-2) With respect to Weekly Combination:
============================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 111 | -0.4 -1.5 0.9 | 2.2 2.3 8.1 |
emr 40 | -1.0 -0.1 3.7 | 4.9 5.1 5.6 |
esa 53 | 0.4 -1.1 -2.7 | 5.8 5.6 9.4 |
gfz 66 | 0.6 -0.2 -2.0 | 1.8 1.8 5.8 |
jpl 62 | -0.3 -0.5 0.6 | 2.8 3.2 5.3 |
ngs 69 | -1.1 0.4 0.7 | 4.6 9.5 8.5 |
ncl 74 | 0.7 -0.3 1.7 | 1.9 2.2 7.0 |
ITR 46 | -0.4 0.1 -0.8 | 6.9 6.3 11.8 |
---------------|---------------------------|---------------------------|
5-2-3) With respect to Cumulative Combination:
================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 111 | -1.6 -0.1 -0.2 | 4.0 2.9 11.6 |
emr 40 | -1.3 0.2 2.8 | 5.0 5.9 10.7 |
esa 53 | -0.3 0.4 -4.3 | 7.6 7.2 9.2 |
gfz 66 | -0.1 1.1 -4.7 | 3.6 4.0 8.9 |
jpl 62 | -0.5 0.7 -0.4 | 3.2 3.8 10.9 |
ngs 69 | -1.5 1.2 -1.5 | 5.9 10.5 10.0 |
ncl 74 | 0.6 0.7 0.0 | 2.9 2.6 8.7 |
igs 131 | -0.9 1.4 -1.4 | 3.5 3.3 8.3 |
ITR 51 | 0.5 0.4 -1.5 | 2.9 3.8 10.7 |
---------------|---------------------------|---------------------------|
5-3) 7-Parameters Transformation: AC ----> ITRF97_IGS_RS51.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 | 0.013 0.022 0.009 9.5 -1.8 -6.8 2.66 |
emr | 0.038 -0.006 0.009 14.3 -14.1 8.7 2.35 |
esa | 0.039 -0.020 -0.016 -4.8 2.5 11.6 1.82 |
gfz | -0.031 -0.013 0.015 -1.1 1.2 -3.0 2.01 |
jpl | 0.037 -0.051 0.015 16.8 -4.0 -4.9 2.31 |
ngs | -0.007 -0.073 0.033 4.2 -0.8 18.6 2.56 |
ncl | -0.004 -0.020 -0.006 0.0 0.3 -2.8 1.02 |
---------------|---------------------------------------------------------------|
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 | 0.061 0.064 0.071 1.6 1.6 1.6 0.25 |
emr | 0.084 0.087 0.101 2.3 2.3 2.2 0.35 |
esa | 0.070 0.068 0.074 1.8 1.8 1.8 0.27 |
gfz | 0.066 0.066 0.078 1.7 1.7 1.7 0.27 |
jpl | 0.066 0.068 0.074 1.7 1.7 1.7 0.27 |
ngs | 0.059 0.060 0.066 1.5 1.5 1.5 0.24 |
ncl | 0.058 0.060 0.067 1.5 1.5 1.5 0.24 |
---------------|---------------------------------------------------------------|
5-4) Geocenter:
====================
| X Y Z | s X s Y s Z |
| (mm) (mm) (mm) | (mm) (mm) (mm) |
---------------|---------------------------|---------------------------|
igs | 6.3 -1.3 -2.6 | 6.6 6.6 9.0 |
---------------|---------------------------|---------------------------|
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 | --- -10.5 -3.0 -.2 -5.7 -.3 |
emr | --- -5.4 5.0 -5.9 -12.2 -27.1 |
esa | --- -10.4 11.7 -.1 -30.0 .9 |
gfz | --- 6.7 4.4 2.2 -.4 -1.9 |
jpl | --- -8.5 -2.4 16.3 8.6 -2.9 |
ngs | --- 176.3 25.6 -110.7 -7.1 -28.6 |
ncl | --- --- --- --- --- --- |
ITR | --- --- --- --- --- --- |
BuA | --- -12.4 4.4 2.5 23.6 1.8 |
---------------|------------------------------------------------------------|
5-5-2) STD :
===============
Solution | UT LOD XPO XPOR YPO YPOR |
| us us .01mas .01ma/d .01mas .01ma/d |
---------------|------------------------------------------------------------|
cod | --- 9.6 3.4 9.0 2.1 17.7 |
emr | --- 19.8 6.6 32.3 8.8 45.0 |
esa | --- 9.5 2.9 15.1 4.0 14.8 |
gfz | --- 8.4 1.7 9.6 1.8 21.3 |
jpl | --- 35.7 4.6 21.5 6.2 46.3 |
ngs | --- 208.6 11.8 22.1 10.3 58.8 |
ncl | --- --- --- --- --- --- |
ITR | --- --- --- --- --- --- |
BuA | --- 15.3 3.8 12.7 10.7 28.0 |
---------------|------------------------------------------------------------|
5-6) Outliers:
===================
Thresholds set at 5 sigmas and 50 mm.
Solution Solution | Station | N E U |
Minus |code id soln| (mm) (mm) (mm)|
-----------------------------------------|------------|-----------------------|
| | |
ITRF97_IGS_RS51.snx esa10637.snx |MCM4 A ----| 14.0 5.1 -57.6|
| | |
ITRF97_IGS_RS51.snx ngs10637.snx |MCM4 A ----| -9.7 -0.1 -63.4|
| | |
cod10637.snx ngs10637.snx |ASC1 A ----| -14.0 -3.8 -51.4|
cod10637.snx ngs10637.snx |BAKO A ----| -6.9 5.3 50.1|
| | |
jpl10637.snx ngs10637.snx |ASC1 A ----| -13.0 -10.0 -50.2|
| | |
ngs10637.snx ncl1063g.snx |ASC1 A ----| 13.7 4.8 54.4|
| | |
igs00P1062.snx ngs10637.snx |GOUG A ----| -16.8 27.4 -53.1|
| | |
IGS00P20.snx cod10637.snx |LAMA A ----| 17.5 -19.2 -12.5|
| | |
IGS00P20.snx gfz10637.snx |ARTU A ----| 0.5 2.3 -42.2|
-----------------------------------------|------------|-----------------------|
5-7) Conflicts:
====================
IERS DOMES NO cod emr esa gfz jpl ngs IGS igs
============= ====== ====== ====== ====== ====== ====== ====== ======
42005M001 GALA A GALA B GALA A GALA A GALA B GALA A GALA A
31303M002 MAS1 A MAS1 A MASP A MAS1 A MAS1 A MAS1 A MAS1 A MAS1 A
12353M001 YAKZ A YAKZ A YAKA A YAKA A
40405S031 GOL2 A GOL2 A GOL2 A GOL2 A GOLD A GOLD A
50103M108 TID2 A TID2 A TID2 A TID1 A TID2 A TIDB A TIDB A
42202M005 AREQ A AREQ A AREQ A AREQ A AREQ A AREQ B AREQ A AREQ A
22306M002 IISC B IISC B IISC A IISC A
MISSING IERS DOMES NOS AT gfz:
-----------------------------
BISH A
IERS DOMES NO ncl IGS igs
============= ====== ====== ======
40405S031 GOL2 A GOLD A GOLD A
50103M108 TID2 A TIDB A TIDB A
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