[IGSREPORT-10994] Wk 1253 IGS SINEX Combination
Remi Ferland
ferland at geod.nrcan.gc.ca
Thu Jan 29 18:00:04 PST 2004
******************************************************************************
IGS Electronic Report 29 Jan 18:00:09 PST 2004 Message Number 10994
******************************************************************************
Author: R. Ferland , D. Hutchison
===================================================================
Combined AC solution for GPS week 1253 - 04/01/11 to 04/01/17
===================================================================
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
igs04P1253.snx Combined weekly solution.
igs04P1253.erp Daily Earth Rotation Parameters.
igs00p02.erp Daily Earth Rotation Parameters since GPS week 1013.
IGS04P02.snx Cumulative Combined solution.
igs04P1253.sum This file.
igs04P1253.itr Residuals between the AC and the IGb00 for the RF stations.
igs04P1253.res Residuals between the AC and the Combined Weekly solution.
IGS04P02.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
IGb00 stations at the current epoch.
ftp://igscb.jpl.nasa.gov/igscb/station/coord/IGS03P33_RS99.SNX.Z
3-4) The AC are compared to IGb00, 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 IGb00 of the current
epoch using a 7-parameters transformation. The singular cumulative
combined solution is aligned to the IGb00 of the reference epoch
using a 14-parameters transformation and the 99 ITRF station positions
and velocities. The IGb00 is a realization of ITRF2000.
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 = IGS03P33_RS99.SNX
igs = igs04P1253.snx
IGS = IGS04P02.snx
MIT = mit12537.snx
mit = mit1253g.snx
BuA = IERS Bulletin A
mit ncl are used to quality control the weekly combination.
gfz excluded from the geocenter estimation (Sec. 5-4).
Solutions with manual station deletion:
ITR FAIR JOZE YSSK
After unconstraining:
ngs GUAM KOKB
4-1) Starting with GPS week 1143, the solutions are aligned to the
IGS03P33_RS99.SNX realization of ITRF2000.
4-2) Starting with GPS week 1078, UT1-UTC from IERS Bulletin A
is included in the erp files.
4-3) Starting with this week combination the weekly and the
cumulative solutions are aligned to the updated IGS realization of
ITRF2000 (IGb00). It replaces the IGS00 realization which has been
used between GPS weeks 1143 and 1252 inclusively. Although both
are realizations of ITRF2000, the IGb00 includes more stations,
and has more recent data. The transformation parameters between
the IGS00 and the IGb00 realization of ITRF2000 can be found in
the table below:
Transformation from IGb00 to IGS00 at epoch 01-JAN-1998:
====================================================================
TX TY TZ RX RY RZ D
mm mm mm mas mas mas ppb
Offset -0.1 0.2 0.2 0.001 0.004 -0.006 0.116
+/- 0.5 0.5 0.5 .017 .018 .020 .07
--------------------------------------------------------------------
dTX dTY dTZ dRX dRY dRZ dD
mm/y mm/y mm/y mas/y mas/y mas/y ppb/y
Drift 0.0 -0.2 -0.1 -.004 -0.005 0.000 -0.056
+/- 0.5 0.5 0.5 .017 .018 .020 .07
--------------------------------------------------------------------
* The IERS convention for the transformation parameters was followed.
The accumulated erp file "igs00p02.erp" will also be aligned to the
"IGS realization of ITRF2000".
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 | 162 | 79 | 28.476 | 0.997 | 28.379 |
emr | 49 | 31 | 5.161 | 1.001 | 5.168 |
esa | 70 | 62 | 7.304 | 0.839 | 6.128 |
gfz | 178 | 89 | 8.377 | 1.018 | 8.529 |
jpl | 113 | 61 | 4.982 | 1.012 | 5.042 |
MIT | 142 | 75 | 3.255 | 1.002 | 3.261 |
ngs | 83 | 83 | 25.409 | 1.006 | 25.552 |
sio | 170 | 88 | 2.252 | 1.000 | 2.253 |
mit | 261 | 88 | 1.587 | 1.032 | 1.637 |
ncl | 156 | 91 | 3.324 | 0.984 | 3.271 |
igs | 244 | 91 | 1.467 | 1.021 | 1.497 |
---------------|-----|-----|---------------|---------------|---------------|
5-2) Solution Residuals weighted Average & STD :
=====================================================
5-2-1) With respect to the IGb00 stations:
=============================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 79 | 1.1 -0.0 -1.3 | 2.9 2.4 12.6 |
emr 31 | 0.7 -0.2 1.0 | 3.4 3.0 11.0 |
esa 62 | -2.6 -0.1 0.1 | 2.7 2.5 11.7 |
gfz 89 | 0.2 -0.2 -0.8 | 2.7 2.9 9.4 |
jpl 61 | -1.0 -0.2 0.3 | 3.0 2.7 10.0 |
MIT 75 | 0.6 0.1 0.4 | 2.8 2.7 9.2 |
ngs 82 | -1.1 0.6 -0.9 | 4.1 5.3 12.3 |
sio 88 | 0.2 0.3 -0.7 | 3.5 3.6 7.3 |
mit 88 | 0.4 0.1 -0.3 | 2.6 2.3 7.9 |
ncl 91 | 0.7 0.0 0.0 | 2.6 2.3 7.9 |
---------------|---------------------------|---------------------------|
5-2-2) With respect to the Weekly Combination:
=================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 159 | 0.4 0.2 -0.9 | 1.4 1.5 6.8 |
emr 48 | -0.1 0.3 1.2 | 2.3 2.1 6.5 |
esa 70 | -2.7 0.1 -0.8 | 2.0 2.0 9.6 |
gfz 173 | -0.7 -0.4 -0.7 | 1.4 1.6 4.7 |
jpl 111 | -1.2 -0.3 -0.6 | 1.9 1.6 7.2 |
MIT 130 | 0.5 0.4 -0.1 | 1.6 1.7 5.2 |
ngs 81 | -1.3 0.4 -0.2 | 4.1 4.7 10.7 |
sio 158 | 0.0 0.3 0.2 | 2.2 2.7 4.8 |
mit 234 | -0.0 0.1 0.0 | 0.6 0.7 2.4 |
ncl 153 | 0.1 0.1 0.1 | 0.9 0.7 2.8 |
ITR 90 | -0.3 0.1 0.1 | 2.1 2.0 7.9 |
---------------|---------------------------|---------------------------|
5-2-3) With respect to the Cumulative Combination:
=====================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 130 | 1.0 0.2 -1.7 | 2.6 2.3 11.8 |
emr 44 | 0.4 -0.0 1.4 | 3.2 3.2 9.4 |
esa 69 | -2.7 -0.2 -1.2 | 2.6 2.5 12.0 |
gfz 161 | -0.2 -0.6 -1.3 | 2.7 2.8 9.0 |
jpl 97 | -1.0 -0.5 -0.1 | 3.1 2.7 9.0 |
MIT 119 | 0.8 0.3 -1.0 | 2.6 2.5 9.1 |
ngs 83 | -1.1 0.7 -0.4 | 4.0 5.2 12.2 |
sio 145 | 0.6 0.3 -0.5 | 3.3 3.4 7.5 |
mit 180 | 0.5 0.1 -0.9 | 2.4 2.1 7.8 |
ncl 146 | 0.8 0.0 -0.7 | 2.3 2.1 7.9 |
igs 183 | 0.4 -0.1 -0.8 | 2.1 2.0 7.2 |
ITR 96 | -0.2 0.0 -0.2 | 0.5 0.5 1.5 |
---------------|---------------------------|---------------------------|
5-3) 7-Parameters Transformation: AC ----> IGS03P33_RS99.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 | 0.010 0.049 -0.013 7.4 14.2 5.9 1.98 |
emr | -0.008 -0.039 0.014 3.5 13.0 -0.1 3.13 |
esa | 0.005 0.025 -0.013 -1.8 12.0 0.2 2.50 |
gfz | 0.053 0.036 0.054 -1.1 2.9 -3.3 1.51 |
jpl | 0.031 0.018 0.014 -2.3 8.4 -1.9 1.12 |
MIT | 0.128 0.050 -0.069 0.0 5.6 21.5 2.87 |
ngs | -0.042 0.085 -0.067 2.6 12.7 39.0 1.40 |
sio | 0.072 -0.061 0.069 7.3 5.4 36.8 2.63 |
mit | 0.007 0.015 -0.002 -0.7 -0.5 -1.2 2.28 |
ncl | 0.017 -0.016 -0.043 1.2 2.5 -2.1 2.41 |
---------------|---------------------------------------------------------------|
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 | 0.045 0.045 0.050 1.2 1.2 1.2 0.18 |
emr | 0.068 0.074 0.081 1.8 1.8 1.8 0.28 |
esa | 0.050 0.050 0.054 1.3 1.3 1.3 0.20 |
gfz | 0.042 0.042 0.047 1.1 1.1 1.1 0.17 |
jpl | 0.050 0.050 0.056 1.3 1.3 1.3 0.20 |
MIT | 0.046 0.046 0.051 1.2 1.2 1.2 0.19 |
ngs | 0.044 0.044 0.050 1.2 1.1 1.1 0.18 |
sio | 0.042 0.043 0.048 1.1 1.1 1.1 0.17 |
mit | 0.042 0.043 0.048 1.1 1.1 1.1 0.17 |
ncl | 0.042 0.042 0.047 1.1 1.1 1.1 0.17 |
---------------|---------------------------------------------------------------|
5-4) Geocenter:
====================
| X Y Z | s X s Y s Z |
| (mm) (mm) (mm) | (mm) (mm) (mm) |
---------------|---------------------------|---------------------------|
igs | -0.7 6.4 9.8 | 1.8 1.9 4.1 |
---------------|---------------------------|---------------------------|
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 | --- 2.7 -4.4 --- -5.5 --- |
emr | --- 13.4 -2.8 16.7 -7.4 -14.3 |
esa | --- 7.0 -1.2 --- 0.1 --- |
gfz | --- -4.3 5.2 1.8 3.0 12.2 |
jpl | --- 26.1 -0.9 17.9 -1.2 12.0 |
MIT | --- 3.3 -1.7 -0.2 -4.1 -0.3 |
ngs | --- 32.4 25.3 --- 14.2 --- |
sio | --- -8.8 2.2 1.2 8.5 -1.6 |
mit | --- 30.2 -1.5 -0.2 -2.7 -0.0 |
ncl | --- 10.8 1.8 --- 3.9 --- |
ITR | --- --- --- --- --- --- |
BuA | --- 7.1 -6.8 -1.3 25.7 1.1 |
---------------|------------------------------------------------------------|
5-5-2) STD :
===============
Solution | UT LOD XPO XPOR YPO YPOR |
| us us .01mas .01ma/d .01mas .01ma/d |
---------------|------------------------------------------------------------|
cod | --- 9.8 1.1 --- 1.4 --- |
emr | --- 7.9 2.7 13.0 4.9 22.7 |
esa | --- 7.6 3.9 --- 3.5 --- |
gfz | --- 3.9 6.4 6.7 3.4 8.0 |
jpl | --- 17.1 2.2 6.0 1.3 10.4 |
MIT | --- 6.4 2.4 4.5 1.8 6.6 |
ngs | --- 26.2 8.1 --- 16.0 --- |
sio | --- 4.7 1.2 7.6 2.4 9.0 |
mit | --- 5.0 2.3 4.7 2.1 4.5 |
ncl | --- 3.3 0.8 --- 1.3 --- |
ITR | --- --- --- --- --- --- |
BuA | --- 13.7 9.0 18.3 6.1 10.5 |
---------------|------------------------------------------------------------|
5-6) Outliers:
===================
Thresholds set at 5 sigmas and 50 mm.
Solution Solution | Station | N E U |
Minus |code id soln| (mm) (mm) (mm)|
-----------------------------------------|------------|-----------------------|
| | |
IGS03P33_RS99.snx ngs12537.snx |YAKT A ----| 7.7 -9.6 54.1|
| | |
cod12537.snx esa12537.snx |FAIR A 2| -7.8 0.7 -50.3|
| | |
cod12537.snx jpl12537.snx |DWH1 A ----| -3.2 -5.2 -56.3|
| | |
esa12537.snx MIT12537.snx |FAIR A 2| 4.6 1.3 52.8|
| | |
esa12537.snx ngs12537.snx |UNSA A ----| -5.4 7.1 56.7|
| | |
gfz12537.snx ngs12537.snx |UNSA A ----| -2.3 6.1 56.6|
| | |
IGS04P01.snx sio12537.snx |KIRU A ----| -7.3 1.2 -35.6|
| | |
IGS04P01.snx mit1253g.snx |OBET A ----| 1.6 -0.6 -57.9|
| | |
IGS04P01.snx igs04P1253.snx |MAG0 A ----| 8.5 5.7 2.1|
IGS04P01.snx igs04P1253.snx |YSSK A ----| 10.1 -4.6 10.0|
-----------------------------------------|------------|-----------------------|
5-7) Conflicts:
====================
IERS DOMES NO UNK cod emr esa gfz jpl ngs sio IGS igs
============= ====== ====== ====== ====== ====== ====== ====== ====== ====== ======
22306M002 IISC A IISC A IISC A IISC B IISC A IISC A IISC B IISC A IISC A IISC A
50134M001 DARR A DARR A DARW A DARW A DARW A DARW A DARW A DARW A DARW A
DARW A
66010M001 DAV1 A DAV1 A DAV1 A DAV1 A DAV1 A DAV1 A DAV1 A DAV1 A DAV1 A DAV1 A
DAVR A DAVR A DAVR A
40451M123 GODE A GODE A GODE A GODE A GODZ A GODE A GODE A GODE A GODE A
GODZ A
40405S031 GOL2 A GOLD A GOL2 A GOLD A GOLD A GOLD B GOL2 A GOLD A GOLD A
13407S012 MAD2 A MADR A MAD2 A MAD2 A MADR A MADR A
MADR A
43001M002 THU3 A THU2 A THU3 A THU3 A THU2 A THU3 A THU3 A
50103M108 TID1 A TIDB A TIDB A TID2 A TIDB A TID2 A TIDB A TIDB A
TID2 A TID2 A TIDB A TIDB A
TIDB A
50107M004 YAR2 A YAR2 A YAR2 A YAR2 A YAR1 A YAR2 A
YAR2 A
10422M001 KIR0 A KR0G A
22003M001 PIMO A PIMO A PIMO B PIMO A PIMO A PIMO A PIMO A PIMO A
12741M001 VENE A VENE A VENE A VENE A
MISSING IERS DOMES NOS AT UNK:
-----------------------------
ASPA A CNCL A HORN A KARA A KYW1 A MIA3 A MTJO A NETT A OUSD A PALM A
PUR2 A PUR3 A QUAR A SAMP A UPO1 A KAYT A
MISSING IERS DOMES NOS AT gfz:
-----------------------------
BISH A PALM A
MISSING IERS DOMES NOS AT sio:
-----------------------------
PUR2 A CONZ A OUSD A CNCL A KARA A MERS A CAVA A SFEL A VOLT A BRAS A
MISSING IERS DOMES NOS AT igs:
-----------------------------
KAYT A HORN A NETT A
IERS DOMES NO mit ncl IGS igs
============= ====== ====== ====== ======
13407S012 MADR A MAD2 A MADR A MADR A
31303M001 MAS1 A
31303M002 MAS1 A MAS1 A MAS1 A
43001M002 THU2 A THU3 A THU3 A THU3 A
40451M123 GODE A GODE A GODE A GODE A
GODZ A GODZ A
40405S031 GOLD A GOL2 A GOLD A GOLD A
GOLD A
50103M108 TIDB A TID2 A TIDB A TIDB A
TIDB A
66010M001 DAV1 A DAV1 A DAV1 A DAV1 A
DAVR A
10422M001 KIR0 A KR0G A
12717M004 NOT1 A NOT1 A NOT1 A
MISSING IERS DOMES NOS AT mit:
-----------------------------
BISH A
MISSING IERS DOMES NOS AT igs:
-----------------------------
KAYT A HORN A NETT A
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