[IGSREPORT-8882] Wk 1143 IGS SINEX Combination
Remi Ferland
ferland at geod.nrcan.gc.ca
Thu Dec 20 11:24:26 PST 2001
******************************************************************************
IGS Electronic Report 20 Dec 11:24:29 PST 2001 Message Number 8882
******************************************************************************
Author: R. Ferland, D. Hutchison
===================================================================
Combined AC solution for GPS week 1143 - 01/12/02 to 01/12/08
===================================================================
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
igs01P1143.snx Combined weekly solution.
igs01P1143.erp Daily Earth Rotation Parameters.
igs00p02.erp Daily Earth Rotation Parameters since GPS week 1013.
IGS01P49.snx Cumulative Combined solution.
igs01P1143.sum This file.
igs01P1143.itr Residuals between the AC and the IGS00 for the RF stations.
igs01P1143.res Residuals between the AC and the Combined Weekly solution.
IGS01P49.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
IGS00 stations at the current epoch.
ftp://igscb.jpl.nasa.gov/igscb/station/coord/IGS01P37_RS54.SNX.Z
3-4) The AC are compared to IGS00, 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 IGS00 of the current
epoch using a 7-parameters transformation. The singular cumulative
combined solution is aligned to the IGS00 of the reference epoch
using a 14-parameters transformation and the 51 ITRF station positions
and velocities. The IGS00 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 = IGS01P37_RS54.SNX
igs = igs01P1143.snx
IGS = IGS01P49.snx
BuA = IERS Bulletin A
mit is used to quality control the weekly combination.
gfz excluded from the geocenter estimation (Sec. 5-4).
Solutions with manual station deletion:
After unconstraining:
emr NRC1 NRC2
4-1) Starting with GPS week 1065, the solutions are aligned to the
IGS01P37_RS54.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 and as already announced by
Robert, the AC Coordinator, the weekly and the cumulative solutions
are aligned to the "IGS realization of ITRF2000". Note that the
transformation parameters betwen the IGS realization of ITRF97 and
ITRF2000 can be found in the table below:
Transformation from IGS(ITRF97) to IGS(ITRF2000) at epoch 01-JAN-1998:
====================================================================
TX TY TZ RX RY RZ D
mm mm mm mas mas mas ppb
Offset -6.0 -5.6 20.1 -0.040 0.001 -0.043 -1.403
+/- 2.5 3.3 5.1 .053 .060 .036 .12
--------------------------------------------------------------------
dTX dTY dTZ dRX dRY dRZ dD
mm/y mm/y mm/y mas/y mas/y mas/y ppb/y
Drift 0.4 0.8 1.5 0.004 -0.001 -0.030 -0.012
+/- 1.7 1.9 2.8 .038 .040 .034 .12
--------------------------------------------------------------------
* The IERS convention for the transformation parameters was followed.
The accumulated erp file "igs00p02.erp" was also aligned to the
"IGS realization of ITRF2000". Thanks also to Jan for volunteering
to check the updated file.
Season's greetings.
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 | 124 | 46 | 28.538 | 1.000 | 28.527 |
emr | 40 | 28 | 3.709 | 1.000 | 3.709 |
esa | 53 | 33 | 14.825 | 1.000 | 14.825 |
gfz | 80 | 39 | 6.547 | 0.999 | 6.542 |
jpl | 67 | 28 | 5.111 | 1.000 | 5.110 |
sio | 130 | 48 | 2.213 | 1.000 | 2.213 |
mit | 157 | 48 | 3.692 | 0.886 | 3.270 |
igs | 148 | 51 | 1.335 | 1.006 | 1.343 |
---------------|-----|-----|---------------|---------------|---------------|
5-2) Solution Residuals weighted Average & STD :
=====================================================
5-2-1) With respect to the IGS00 stations:
=============================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 45 | 0.5 0.5 -1.0 | 3.3 3.8 12.0 |
emr 27 | -5.1 0.3 -1.1 | 5.7 4.3 8.1 |
esa 30 | -10.8 0.6 0.9 | 7.0 8.1 20.5 |
gfz 38 | -0.6 0.0 0.5 | 2.5 3.3 7.4 |
jpl 27 | -1.8 -0.6 0.6 | 2.6 3.4 7.9 |
sio 47 | -0.2 0.1 0.4 | 2.5 3.3 9.5 |
mit 47 | 0.5 0.0 -0.5 | 2.5 2.7 7.1 |
---------------|---------------------------|---------------------------|
5-2-2) With respect to the Weekly Combination:
=================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 121 | 1.1 1.2 -0.8 | 2.2 3.3 10.0 |
emr 39 | -4.3 1.0 -0.6 | 3.8 4.3 6.3 |
esa 52 | -10.6 1.6 3.7 | 5.9 6.9 16.4 |
gfz 74 | 0.4 0.7 2.0 | 1.3 1.6 5.6 |
jpl 62 | -0.5 -1.0 2.0 | 1.7 1.8 7.7 |
sio 124 | 1.1 -0.3 2.6 | 1.3 2.5 6.9 |
mit 139 | 1.3 0.0 0.1 | 0.9 1.0 4.4 |
ITR 50 | 0.9 0.0 0.2 | 2.6 2.7 8.6 |
---------------|---------------------------|---------------------------|
5-2-3) With respect to the Cumulative Combination:
=====================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 122 | -0.2 0.8 -1.7 | 3.3 4.1 12.2 |
emr 40 | -5.8 0.9 0.4 | 5.9 5.1 8.4 |
esa 53 | -11.5 0.4 2.8 | 7.0 8.6 20.4 |
gfz 75 | -1.0 0.2 2.2 | 3.1 3.4 7.8 |
jpl 63 | -2.0 -1.0 1.6 | 3.5 3.4 9.0 |
sio 125 | -0.4 -0.3 1.8 | 2.7 3.9 10.4 |
mit 140 | 0.0 -0.1 -0.6 | 2.7 3.1 8.1 |
igs 148 | -1.5 -0.1 -0.6 | 2.5 2.7 7.4 |
ITR 54 | -0.2 -0.1 0.0 | 0.3 0.4 0.9 |
---------------|---------------------------|---------------------------|
5-3) 7-Parameters Transformation: AC ----> IGS01P37_RS54.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 | 0.017 -0.023 -0.009 14.9 12.4 -0.0 1.70 |
emr | 0.004 0.024 -0.062 0.3 8.0 17.6 0.80 |
esa | 0.027 0.094 -0.011 -7.8 22.0 2.4 1.30 |
gfz | -0.035 0.008 -0.063 -0.7 0.2 -1.7 1.35 |
jpl | -0.004 0.002 0.012 -2.1 17.2 -8.9 0.61 |
sio | 0.133 -0.112 0.001 11.8 7.6 95.2 1.49 |
mit | -0.012 -0.022 -0.134 -4.2 -2.5 25.5 1.26 |
---------------|---------------------------------------------------------------|
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 | 0.058 0.058 0.066 1.5 1.5 1.5 0.24 |
emr | 0.076 0.073 0.093 2.0 2.0 2.0 0.31 |
esa | 0.073 0.079 0.084 2.0 2.0 2.0 0.31 |
gfz | 0.063 0.063 0.073 1.6 1.6 1.6 0.26 |
jpl | 0.076 0.073 0.085 2.0 2.0 2.0 0.31 |
sio | 0.057 0.057 0.065 1.5 1.5 1.5 0.23 |
mit | 0.057 0.057 0.066 1.5 1.5 1.5 0.23 |
---------------|---------------------------------------------------------------|
5-4) Geocenter:
====================
| X Y Z | s X s Y s Z |
| (mm) (mm) (mm) | (mm) (mm) (mm) |
---------------|---------------------------|---------------------------|
igs | 5.4 8.7 11.0 | 5.1 5.3 8.1 |
---------------|---------------------------|---------------------------|
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 | --- 20.8 -3.3 --- 2.6 --- |
emr | --- 1.0 .5 12.9 15.3 -42.6 |
esa | --- 12.0 -27.7 .2 -7.1 1.6 |
gfz | --- -14.2 2.3 -1.7 -.4 -3.6 |
jpl | --- -1.4 -2.3 -19.4 6.6 4.9 |
sio | --- -.7 7.0 3.6 -3.3 4.9 |
mit | --- -.3 -.4 .8 2.7 .1 |
ITR | --- --- --- --- --- --- |
BuA | --- 4.4 -2.4 -2.2 24.6 -3.6 |
---------------|------------------------------------------------------------|
5-5-2) STD :
===============
Solution | UT LOD XPO XPOR YPO YPOR |
| us us .01mas .01ma/d .01mas .01ma/d |
---------------|------------------------------------------------------------|
cod | --- 15.9 3.8 --- 2.9 --- |
emr | --- 10.6 5.5 22.9 5.5 41.1 |
esa | --- 12.3 3.4 10.7 8.4 10.6 |
gfz | --- 15.1 2.1 9.2 4.2 12.8 |
jpl | --- 43.2 3.5 15.6 .7 23.7 |
sio | --- 15.5 2.3 5.7 2.0 10.7 |
mit | --- 5.4 1.3 1.2 .9 2.1 |
ITR | --- --- --- --- --- --- |
BuA | --- 13.7 5.3 11.1 12.4 17.5 |
---------------|------------------------------------------------------------|
5-6) Outliers:
===================
Thresholds set at 5 sigmas and 50 mm.
Solution Solution | Station | N E U |
Minus |code id soln| (mm) (mm) (mm)|
-----------------------------------------|------------|-----------------------|
| | |
cod11437.snx esa11437.snx |CRO1 A ----| -14.9 0.0 -77.1|
cod11437.snx esa11437.snx |IISC A ----| -11.1 4.8 -81.9|
cod11437.snx esa11437.snx |MCM4 A ----| 1.3 -4.6 -51.7|
cod11437.snx esa11437.snx |SUTH A ----| -3.2 1.4 62.2|
| | |
emr11437.snx esa11437.snx |IISC A ----| -2.1 -15.0 -98.3|
| | |
esa11437.snx gfz11437.snx |IISC A ----| 6.6 3.2 83.5|
esa11437.snx gfz11437.snx |SANT A ----| 1.0 -1.6 -50.7|
| | |
esa11437.snx jpl11437.snx |CRO1 A ----| 13.8 -6.1 81.6|
esa11437.snx jpl11437.snx |IISC A ----| 6.5 7.7 91.6|
esa11437.snx jpl11437.snx |KELY A ----| -2.0 3.1 -84.1|
| | |
esa11437.snx sio11437.snx |IISC A ----| 8.6 1.4 85.8|
| | |
esa11437.snx mit1143g.snx |IISC A ----| 9.9 2.5 87.7|
| | |
esa11437.snx sio11437.snx |ZIMM A ----| 14.8 -9.1 62.0|
| | |
esa11437.snx mit1143g.snx |ZIMM A ----| 14.3 -8.5 50.6|
| | |
IGS01P48.snx cod11437.snx |HOFN A ----| 6.1 -3.0 -58.7|
| | |
IGS01P48.snx gfz11437.snx |HOFN A ----| 8.7 -4.7 -47.4|
| | |
IGS01P48.snx sio11437.snx |ARTU A ----| -1.6 4.9 30.4|
IGS01P48.snx sio11437.snx |HOFN A ----| 6.4 -3.5 -47.9|
IGS01P48.snx sio11437.snx |WHIT A ----| 6.7 -2.8 -31.0|
| | |
IGS01P48.snx mit1143g.snx |HOFN A ----| 6.9 -5.0 -54.5|
| | |
IGS01P48.snx igs01P1143.snx |COCO A ----| 5.5 -16.1 -1.6|
-----------------------------------------|------------|-----------------------|
5-7) Conflicts:
====================
IERS DOMES NO cod emr esa gfz jpl sio IGS igs
============= ====== ====== ====== ====== ====== ====== ====== ======
40405S031 GOLD A GOLD A GOL2 A GOLD A GOLD A
GOLD A
13407S012 MADR A MADR A MAD2 A MADR A MADR A
40114M001 NRC1 A NRC1 A NRC1 A NRC1 A NRC1 A NRC1 A NRC1 A
NRC2 A
42005M001 GALA A GALA A GALA B GALA A GALA A GALA A GALA A GALA A
50103M108 TIDB A TIDB A TID1 A TIDB A TIDB A TIDB A
TIDB A
50107M004 YAR1 A YAR1 A YAR1 A YAR1 A YAR1 A YAR1 A YAR1 A YAR1 A
YAR2 A
30314M002 SUTH A SUTH A SUTH B SUTH A SUTH A SUTH A
22306M002 IISC A IISC A IISC B IISC A IISC A IISC A IISC A IISC A
MISSING IERS DOMES NOS AT gfz:
-----------------------------
BISH A
MISSING IERS DOMES NOS AT sio:
-----------------------------
CAVA A SFEL A VOLT A
IERS DOMES NO mit IGS igs
============= ====== ====== ======
13407S012 MADR A MADR A MADR A
MAD2 A
31303M001 MAS1 A
31303M002 MAS1 A MAS1 A
40114M001 NRC1 A NRC1 A NRC1 A
NRC2 A
40405S031 GOLD A GOLD A GOLD A
GOL2 A
50103M108 TIDB A TIDB A TIDB A
TID1 A
50107M004 YAR1 A YAR1 A YAR1 A
YAR2 A
12309M001 MDVO A
12309M002 MDVO A MDVO A
MISSING IERS DOMES NOS AT mit:
-----------------------------
BISH A
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