[IGSREPORT-8509] Wk 1124 IGS SINEX Combination
Remi Ferland
ferland at geod.nrcan.gc.ca
Thu Aug 9 18:08:14 PDT 2001
******************************************************************************
IGS Electronic Report 09 Aug 18:08:16 PDT 2001 Message Number 8509
******************************************************************************
Author: R. Ferland , D. Hutchison
===================================================================
Combined AC solution for GPS week 1124 - 01/07/22 to 01/07/28
===================================================================
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
igs01P1124.snx Combined weekly solution.
igs01P1124.erp Daily Earth Rotation Parameters.
igs00p02.erp Daily Earth Rotation Parameters since GPS week 1013.
IGS01P30.snx Cumulative Combined solution.
igs01P1124.sum This file.
igs01P1124.itr Residuals between the AC and the IGS97 for the RF stations.
igs01P1124.res Residuals between the AC and the Combined Weekly solution.
IGS01P30.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
IGS97 stations at the current epoch.
ftp://igscb.jpl.nasa.gov/igscb/station/coord/IGS00P04_RS51.SNX.Z
3-4) The AC are compared to IGS97, 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 IGS97 of the current
epoch using a 7-parameters transformation. The singular cumulative
combined solution is aligned to the IGS97 of the reference epoch
using a 14-parameters transformation and the 51 ITRF station positions
and velocities. The IGS97 is a realization of ITRF97.
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 = IGS00P04_RS51.SNX
igs = igs01P1124.snx
IGS = IGS01P30.snx
BuA = IERS Bulletin A
mit ncl are used to quality control the weekly combination.
emr gfz ngs sio excluded from the geocenter estimation (Sec. 5-4).
Solutions with manual station deletion:
From the original solution:
ITR AREQ
After unconstraining:
emr NRC1 NRC2
New stations in the cumulative solution IGS01P30.snx
AREQ A 3
4-1) Starting with GPS week 1065, the solutions are aligned to the
IGS00P04_RS51.SNX realization of ITRF97.
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 | 126 | 44 | 36.025 | 1.004 | 36.157 |
emr | 39 | 28 | 3.365 | 1.007 | 3.389 |
esa | 50 | 36 | 10.515 | 1.002 | 10.540 |
gfz | 76 | 38 | 11.070 | 1.007 | 11.151 |
jpl | 63 | 27 | 4.372 | 1.008 | 4.406 |
ngs | 66 | 46 | 21.298 | 1.004 | 21.379 |
sio | 134 | 43 | 1.940 | 1.004 | 1.948 |
mit | 157 | 45 | 1.383 | 1.135 | 1.570 |
ncl | 99 | 46 | 2.473 | 1.007 | 2.491 |
igs | 128 | 47 | 1.375 | 1.038 | 1.427 |
---------------|-----|-----|---------------|---------------|---------------|
5-2) Solution Residuals weighted Average & STD :
=====================================================
5-2-1) With respect to the IGS97 stations:
=============================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 42 | 0.5 0.8 -0.7 | 3.7 4.4 11.8 |
emr 26 | -1.1 0.1 -0.2 | 3.9 5.2 10.9 |
esa 33 | -0.5 0.2 -0.9 | 6.4 6.6 13.0 |
gfz 37 | 0.0 0.0 -1.1 | 2.9 3.9 10.9 |
jpl 26 | 0.0 -0.2 -1.1 | 2.9 4.5 10.5 |
ngs 43 | 0.0 -0.3 0.0 | 7.5 9.0 13.7 |
sio 41 | -0.1 -0.1 -1.9 | 3.4 3.8 11.3 |
mit 42 | -0.2 0.3 -1.5 | 4.2 4.2 11.6 |
ncl 45 | 0.0 -0.2 -0.3 | 2.7 4.3 8.2 |
---------------|---------------------------|---------------------------|
5-2-2) With respect to the Weekly Combination:
=================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 113 | 0.7 1.1 0.4 | 2.1 2.4 10.8 |
emr 37 | -1.4 1.0 -0.1 | 2.1 3.8 6.9 |
esa 49 | -0.2 0.9 -0.8 | 4.5 5.5 7.5 |
gfz 67 | -0.2 -0.1 0.5 | 1.8 1.8 5.5 |
jpl 54 | -0.5 -0.1 -1.9 | 2.0 2.1 6.7 |
ngs 64 | 1.6 -1.9 0.2 | 7.8 7.8 10.4 |
sio 112 | -0.4 -0.2 1.8 | 1.9 2.2 6.8 |
mit 119 | 0.0 0.8 -0.3 | 2.5 2.3 6.9 |
ncl 91 | 0.0 -0.3 0.9 | 1.3 2.0 4.1 |
ITR 46 | 0.1 -0.1 -0.3 | 3.1 4.2 10.7 |
---------------|---------------------------|---------------------------|
5-2-3) With respect to the Cumulative Combination:
=====================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 114 | 0.6 1.7 -1.3 | 3.5 4.5 11.9 |
emr 37 | -0.6 0.9 0.2 | 3.6 4.2 8.7 |
esa 50 | -0.3 1.3 -1.0 | 5.7 6.3 9.8 |
gfz 67 | -0.1 0.1 -0.7 | 2.6 3.1 8.4 |
jpl 54 | 0.2 0.0 -2.0 | 2.8 3.0 10.2 |
ngs 65 | 1.8 -1.6 -0.8 | 8.7 8.8 10.5 |
sio 113 | -0.6 0.2 0.5 | 3.5 3.9 8.6 |
mit 120 | -0.1 1.2 -1.3 | 4.0 4.2 9.1 |
ncl 91 | 0.0 0.0 0.1 | 2.4 3.0 6.3 |
igs 128 | -0.1 0.5 -1.1 | 2.6 2.7 6.7 |
ITR 50 | 0.0 0.0 -0.2 | 1.5 2.2 6.3 |
---------------|---------------------------|---------------------------|
5-3) 7-Parameters Transformation: AC ----> IGS00P04_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 | 0.095 -0.136 0.040 10.6 8.9 -2.6 2.99 |
emr | 0.004 -0.040 0.004 17.6 -3.9 -1.6 2.32 |
esa | 0.148 0.042 -0.034 1.8 6.4 8.3 1.14 |
gfz | 0.002 -0.026 0.055 -1.4 1.3 -3.5 2.41 |
jpl | -0.040 0.013 -0.036 -2.6 6.3 -29.0 2.23 |
ngs | -0.085 -0.037 -0.252 20.0 -3.5 -41.5 2.12 |
sio | 0.260 -0.131 -0.028 4.8 14.1 9.2 1.37 |
mit | -0.038 -0.002 -0.045 -0.2 -2.2 -0.1 2.04 |
ncl | -0.068 0.522 -0.969 2.4 -3.7 -16.2 1.89 |
---------------|---------------------------------------------------------------|
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 | 0.062 0.062 0.068 1.6 1.6 1.6 0.25 |
emr | 0.076 0.077 0.086 2.0 2.0 2.0 0.31 |
esa | 0.073 0.070 0.078 1.9 1.9 1.8 0.28 |
gfz | 0.065 0.065 0.074 1.7 1.7 1.7 0.26 |
jpl | 0.079 0.075 0.087 2.0 2.0 2.0 0.31 |
ngs | 0.062 0.062 0.069 1.6 1.6 1.6 0.25 |
sio | 0.063 0.062 0.070 1.6 1.6 1.6 0.25 |
mit | 0.063 0.062 0.071 1.6 1.6 1.6 0.25 |
ncl | 0.060 0.059 0.066 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 | 10.0 1.8 -25.2 | 2.7 2.7 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 | --- -21.0 -1.4 -.7 -3.7 -1.6 |
emr | --- 9.3 -2.8 -2.3 6.8 -13.4 |
esa | --- 18.9 .1 -4.3 -35.9 .1 |
gfz | --- -.5 7.5 .8 6.3 .7 |
jpl | --- --- .7 -9.6 5.4 16.0 |
ngs | --- 6.9 -22.0 -23.3 43.5 -76.0 |
sio | --- -11.1 2.8 -12.4 4.5 -4.2 |
mit | --- -97.5 -1.0 -2.0 -5.3 -.5 |
ncl | --- --- --- --- --- --- |
ITR | --- --- --- --- --- --- |
BuA | --- 3.9 4.5 1.3 29.8 .4 |
---------------|------------------------------------------------------------|
5-5-2) STD :
===============
Solution | UT LOD XPO XPOR YPO YPOR |
| us us .01mas .01ma/d .01mas .01ma/d |
---------------|------------------------------------------------------------|
cod | --- 6.0 2.9 13.4 4.5 10.7 |
emr | --- 19.1 3.7 24.2 4.0 19.7 |
esa | --- 7.4 5.4 20.2 6.2 8.9 |
gfz | --- 8.6 1.7 9.8 1.9 6.0 |
jpl | --- --- 3.4 13.4 2.6 13.9 |
ngs | --- 41.2 9.5 59.5 13.6 83.2 |
sio | --- 4.4 4.7 18.9 4.7 8.3 |
mit | --- 123.8 4.0 7.3 4.9 7.9 |
ncl | --- --- --- --- --- --- |
ITR | --- --- --- --- --- --- |
BuA | --- 16.8 2.4 7.8 2.9 6.5 |
---------------|------------------------------------------------------------|
5-6) Outliers:
===================
Thresholds set at 5 sigmas and 50 mm.
Solution Solution | Station | N E U |
Minus |code id soln| (mm) (mm) (mm)|
-----------------------------------------|------------|-----------------------|
| | |
IGS00P04_RS51.snx jpl11247.snx |MALI A ----| 6.4 -17.9 -10.9|
| | |
IGS00P04_RS51.snx sio11247.snx |TSKB A ----| -2.1 -10.1 27.8|
| | |
cod11247.snx esa11247.snx |OHIG A ----| 11.6 -3.2 56.3|
| | |
cod11247.snx ngs11247.snx |OHIG A ----| -50.4 27.6 -1.4|
cod11247.snx ngs11247.snx |THTI A ----| -16.5 16.2 51.5|
| | |
emr11247.snx esa11247.snx |SANT A ----| 14.5 11.3 50.7|
| | |
emr11247.snx ngs11247.snx |EISL A ----| -29.6 -54.3 -18.4|
| | |
jpl11247.snx ngs11247.snx |EISL A ----| -25.9 -51.4 -16.0|
| | |
ngs11247.snx sio11247.snx |BAKO A ----| 6.9 0.9 58.9|
ngs11247.snx sio11247.snx |CORD A ----| 25.8 -22.5 58.1|
ngs11247.snx sio11247.snx |EISL A ----| 22.4 38.5 51.8|
ngs11247.snx sio11247.snx |SANT A ----| 33.0 -9.0 60.2|
| | |
ngs11247.snx mit1124g.snx |BAKO A ----| 5.6 2.2 71.2|
ngs11247.snx mit1124g.snx |EISL A ----| 33.0 54.6 26.1|
ngs11247.snx mit1124g.snx |OHIG A ----| 61.7 -30.1 37.6|
ngs11247.snx mit1124g.snx |RIOG A ----| 62.1 -13.8 27.6|
ngs11247.snx mit1124g.snx |SANT A ----| 45.0 -3.4 54.9|
| | |
cod11247.snx esa11247.snx |RIOG A ----| 20.6 -1.4 51.6|
| | |
cod11247.snx sio11247.snx |RIOG A ----| -7.5 -6.9 51.0|
| | |
ngs11247.snx sio11247.snx |AREQ A 3| 26.2 -13.8 50.1|
| | |
IGS01P29.snx gfz11247.snx |COCO A ----| 6.5 -24.8 14.2|
| | |
IGS01P29.snx jpl11247.snx |LAE1 A ----| 3.0 -3.3 34.5|
| | |
IGS01P29.snx ncl1124g.snx |COCO A ----| 5.7 -27.8 10.6|
| | |
IGS01P29.snx igs01P1124.snx |COCO A ----| 6.1 -26.3 4.5|
IGS01P29.snx igs01P1124.snx |SSIA A ----| 14.9 -6.0 5.0|
-----------------------------------------|------------|-----------------------|
5-7) Conflicts:
====================
IERS DOMES NO cod emr esa gfz jpl ngs sio IGS igs
============= ====== ====== ====== ====== ====== ====== ====== ====== ======
50103M108 TIDB A TID2 A TIDB A TIDB A TID2 A TID2 A TIDB A TIDB A
42005M001 GALA A GALA B GALA A GALA A GALA B GALA A GALA A GALA A
13407S012 MADR A MADR A MAD2 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
40405S031 GOLD A GOL2 A GOLD A GOL2 A GOL2 A GOLD A GOLD A
42202M005 AREQ A AREQ A AREQ A AREQ A AREQ B AREQ A AREQ A AREQ A
22003M001 PIMO B PIMO A PIMO A PIMO A PIMO A
22306M002 IISC B IISC A IISC A IISC B IISC A IISC A IISC A
MISSING IERS DOMES NOS AT gfz:
-----------------------------
BISH A
IERS DOMES NO mit ncl IGS igs
============= ====== ====== ====== ======
13407S012 MADR A 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 GOL2 A GOLD A GOLD A
GOL2 A
50103M108 TIDB A TID2 A TIDB A TIDB A
TID2 A TIDB A
12309M001 MDVO A
12309M002 MDVO A MDVO A
MISSING IERS DOMES NOS AT mit:
-----------------------------
BISH A
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