[IGSREPORT-9459] Wk 1174 IGS SINEX Combination
Remi Ferland
ferland at geod.nrcan.gc.ca
Thu Jul 25 09:22:21 PDT 2002
******************************************************************************
IGS Electronic Report 25 Jul 09:22:24 PDT 2002 Message Number 9459
******************************************************************************
Author: R. Ferland , D. Hutchison
===================================================================
Combined AC solution for GPS week 1174 - 02/07/07 to 02/07/13
===================================================================
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
igs02P1174.snx Combined weekly solution.
igs02P1174.erp Daily Earth Rotation Parameters.
igs00p02.erp Daily Earth Rotation Parameters since GPS week 1013.
IGS02P28.snx Cumulative Combined solution.
igs02P1174.sum This file.
igs02P1174.itr Residuals between the AC and the IGS00 for the RF stations.
igs02P1174.res Residuals between the AC and the Combined Weekly solution.
IGS02P28.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 54 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 = igs02P1174.snx
IGS = IGS02P28.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:
After unconstraining:
jpl KELY
sio SANT
4-1) Starting with GPS week 1143, 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.
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 | 138 | 46 | 25.041 | 1.000 | 25.038 |
emr | 42 | 23 | 4.480 | 1.000 | 4.479 |
esa | 57 | 38 | 11.079 | 1.000 | 11.078 |
gfz | 90 | 38 | 7.473 | 1.000 | 7.472 |
jpl | 85 | 32 | 4.316 | 1.000 | 4.315 |
sio | 131 | 43 | 2.039 | 1.000 | 2.038 |
mit | 177 | 48 | 3.387 | 0.805 | 2.727 |
ncl | 106 | 45 | 2.258 | 0.947 | 2.139 |
igs | 170 | 50 | 1.132 | 1.001 | 1.133 |
---------------|-----|-----|---------------|---------------|---------------|
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 42 | 1.3 0.3 0.4 | 2.7 3.4 11.9 |
emr 22 | 0.6 -0.2 0.3 | 2.8 2.6 7.6 |
esa 35 | 1.5 -0.7 -0.5 | 8.4 4.2 10.3 |
gfz 37 | -0.1 0.1 -1.3 | 2.6 2.9 10.0 |
jpl 31 | -0.2 0.3 0.1 | 2.0 2.5 8.7 |
sio 40 | -1.5 0.1 -1.1 | 2.7 3.8 8.9 |
mit 47 | -0.5 0.1 -0.6 | 2.5 2.9 9.1 |
ncl 44 | 0.5 0.1 -0.1 | 2.2 2.5 6.6 |
---------------|---------------------------|---------------------------|
5-2-2) With respect to the Weekly Combination:
=================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 135 | 1.4 0.2 -0.3 | 1.5 1.2 9.4 |
emr 42 | 0.5 -0.2 0.1 | 1.9 1.7 6.1 |
esa 56 | 1.8 -0.9 -0.7 | 7.5 4.6 9.1 |
gfz 89 | -0.3 0.4 0.1 | 1.3 1.6 4.7 |
jpl 84 | 0.0 0.9 -0.8 | 1.4 1.1 6.6 |
sio 125 | -0.9 -0.1 0.7 | 2.6 3.7 10.3 |
mit 165 | -0.4 -0.1 -0.9 | 1.0 0.7 6.0 |
ncl 104 | 0.5 0.0 0.2 | 0.7 0.4 3.0 |
ITR 49 | 0.1 -0.5 0.4 | 2.4 2.6 7.1 |
---------------|---------------------------|---------------------------|
5-2-3) With respect to the Cumulative Combination:
=====================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 126 | 0.8 0.5 -1.3 | 2.4 2.6 11.0 |
emr 41 | 0.2 -0.6 -2.0 | 2.5 2.3 9.5 |
esa 56 | 1.6 -0.8 -0.3 | 8.0 4.8 10.4 |
gfz 78 | -0.5 0.1 -0.6 | 2.2 2.6 9.0 |
jpl 75 | -0.3 0.5 -2.1 | 2.0 2.1 9.4 |
sio 122 | -1.5 0.0 0.0 | 2.8 3.6 10.8 |
mit 142 | -1.0 0.1 -2.1 | 2.1 2.3 9.1 |
ncl 101 | 0.1 0.0 -0.7 | 1.8 1.7 8.1 |
igs 145 | -0.4 0.0 -1.4 | 1.7 1.8 5.9 |
ITR 54 | -0.2 -0.3 0.0 | 0.9 1.1 2.1 |
---------------|---------------------------|---------------------------|
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 | 0.007 0.004 -0.030 4.1 7.2 26.1 1.83 |
emr | 0.001 -0.007 -0.017 8.0 3.2 0.3 0.59 |
esa | 0.083 -0.047 0.069 -3.6 4.1 12.3 0.43 |
gfz | -0.025 0.016 0.010 -0.9 2.0 -0.2 0.56 |
jpl | 0.015 0.000 -0.051 -4.0 0.1 -15.8 0.82 |
sio | -0.071 0.071 -0.053 0.0 -0.0 18.8 -0.10 |
mit | -0.004 -0.001 0.008 -0.6 -0.5 0.2 1.55 |
ncl | -0.016 0.015 -0.039 -0.3 -0.2 -0.2 0.75 |
---------------|---------------------------------------------------------------|
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 0.062 0.069 1.6 1.6 1.6 0.25 |
emr | 0.086 0.081 0.095 2.2 2.2 2.2 0.34 |
esa | 0.068 0.069 0.075 1.8 1.8 1.8 0.28 |
gfz | 0.065 0.066 0.072 1.7 1.7 1.7 0.26 |
jpl | 0.069 0.069 0.080 1.8 1.8 1.8 0.28 |
sio | 0.064 0.064 0.071 1.6 1.6 1.6 0.25 |
mit | 0.057 0.057 0.066 1.5 1.5 1.5 0.23 |
ncl | 0.059 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 | -0.3 1.7 0.4 | 3.2 3.3 4.3 |
---------------|---------------------------|---------------------------|
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 | --- -8.8 .6 --- -2.7 --- |
emr | --- 15.1 -1.8 8.8 -3.1 -15.4 |
esa | --- 7.1 -6.4 --- -8.6 --- |
gfz | --- 3.4 6.4 1.5 5.3 -1.5 |
jpl | --- 6.6 -1.2 3.4 -.9 2.1 |
sio | --- -15.3 5.4 -6.3 8.1 -3.6 |
mit | --- -242.9 4.2 -9.3 2.5 -.6 |
ncl | --- -2.2 -.5 --- .9 --- |
ITR | --- --- --- --- --- --- |
BuA | --- -3.4 -.5 -11.0 26.1 .4 |
---------------|------------------------------------------------------------|
5-5-2) STD :
===============
Solution | UT LOD XPO XPOR YPO YPOR |
| us us .01mas .01ma/d .01mas .01ma/d |
---------------|------------------------------------------------------------|
cod | --- 4.3 1.4 --- 3.6 --- |
emr | --- 12.5 2.2 12.9 5.9 17.3 |
esa | --- 8.6 6.9 --- 5.6 --- |
gfz | --- 5.8 3.0 10.2 4.9 11.1 |
jpl | --- 14.6 1.0 6.8 1.8 8.5 |
sio | --- 6.9 4.5 5.8 1.7 9.6 |
mit | --- 185.5 1.1 3.7 2.0 9.5 |
ncl | --- .6 .5 --- .9 --- |
ITR | --- --- --- --- --- --- |
BuA | --- 23.7 4.4 7.2 5.1 10.8 |
---------------|------------------------------------------------------------|
5-6) Outliers:
===================
Thresholds set at 5 sigmas and 50 mm.
Solution Solution | Station | N E U |
Minus |code id soln| (mm) (mm) (mm)|
-----------------------------------------|------------|-----------------------|
| | |
IGS01P37_RS54.snx esa11747.snx |CHAT A ----| 3.7 -1.7 -88.2|
| | |
cod11747.snx esa11747.snx |NLIB A ----| 4.5 -8.3 -52.3|
| | |
cod11747.snx sio11747.snx |BJFS A ----| 6.8 -0.4 50.9|
cod11747.snx sio11747.snx |LPGS A ----| -1.2 -3.8 50.1|
cod11747.snx sio11747.snx |MAG0 A ----| 4.3 4.5 51.8|
cod11747.snx sio11747.snx |RIOG A ----| -5.1 1.5 52.5|
cod11747.snx sio11747.snx |URUM A ----| -0.4 -3.6 48.1|
| | |
igs02P1173.snx esa11747.snx |ZWEN A ----| -23.1 -9.2 -5.5|
| | |
IGS02P27.snx jpl11747.snx |TID1 A ----| -109.0 -40.6 2.6|
| | |
IGS02P27.snx mit1174g.snx |TID1 A ----| -107.0 -41.2 2.2|
| | |
IGS02P27.snx igs02P1174.snx |BOGT A ----| -3.1 0.4 22.7|
IGS02P27.snx igs02P1174.snx |HERS A ----| -2.4 10.3 7.7|
-----------------------------------------|------------|-----------------------|
5-7) Conflicts:
====================
IERS DOMES NO cod emr esa gfz jpl sio IGS igs
============= ====== ====== ====== ====== ====== ====== ====== ======
50107M004 YAR2 A YAR1 A YAR1 A
30314M002 SUTH A SUTH B SUTH A SUTH A SUTH A SUTH A
42005M001 GALA A GALA A GALA B GALA A GALA A GALA A GALA A GALA A
22306M002 IISC A IISC A IISC B IISC A IISC A IISC A IISC A IISC A
13407S012 MADR A MADR A MAD2 A MAD2 A MADR A MADR A
40114M001 NRC1 A NRC1 A NRC1 A NRC1 A NRC1 A NRC1 A NRC1 A
NRC2 A
40405S031 GOLD A GOLD A GOL2 A GOLD A GOLD A
50103M108 TIDB A TID2 A TIDB A TID1 A TID2 A TIDB A TIDB A
TIDB A TIDB A
MISSING IERS DOMES NOS AT sio:
-----------------------------
TCMS A CAVA A SFEL A VOLT A
IERS DOMES NO mit ncl IGS igs
============= ====== ====== ====== ======
13407S012 MADR A MADR A MADR A
MAD2 A
31303M001 MAS1 A
31303M002 MAS1 A MAS1 A MAS1 A
40114M001 NRC1 A NRC1 A NRC1 A NRC1 A
NRC2 A
40405S031 GOLD A GOLD A GOLD A
GOL2 A
50103M108 TIDB A TIDB A TIDB A TIDB A
TID1 A
TID2 A
50107M004 YAR2 A YAR1 A YAR1 A
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