[IGSREPORT-8231] Wk 1110 IGS SINEX Combination
Remi Ferland
ferland at geod.nrcan.gc.ca
Thu May 3 12:33:58 PDT 2001
******************************************************************************
IGS Electronic Report 03 May 12:34:05 PDT 2001 Message Number 8231
******************************************************************************
Author: R. Ferland , D. Hutchison
===================================================================
Combined AC solution for GPS week 1110 - 01/04/15 to 01/04/21
===================================================================
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
igs01P1110.snx Combined weekly solution.
igs01P1110.erp Daily Earth Rotation Parameters.
igs00p02.erp Daily Earth Rotation Parameters since GPS week 1013.
IGS01P16.snx Cumulative Combined solution.
igs01P1110.sum This file.
igs01P1110.itr Residuals between the AC and the IGS97 for the RF stations.
igs01P1110.res Residuals between the AC and the Combined Weekly solution.
IGS01P16.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 = igs01P1110.snx
IGS = IGS01P16.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).
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 | 127 | 44 | 33.595 | 0.999 | 33.551 |
emr | 52 | 30 | 2.770 | 1.000 | 2.769 |
gfz | 68 | 36 | 17.500 | 0.999 | 17.489 |
jpl | 77 | 32 | 3.877 | 0.998 | 3.870 |
ngs | 73 | 46 | 21.591 | 0.999 | 21.576 |
sio | 140 | 45 | 2.326 | 0.999 | 2.323 |
ncl | 100 | 45 | 2.808 | 1.046 | 2.937 |
igs | 130 | 49 | 1.250 | 1.000 | 1.250 |
---------------|-----|-----|---------------|---------------|---------------|
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 43 | -0.2 0.7 -1.3 | 3.7 3.8 11.0 |
emr 29 | 0.0 -0.6 0.2 | 3.4 5.7 10.0 |
gfz 35 | -0.8 0.3 -0.2 | 3.3 4.3 8.4 |
jpl 31 | -1.4 -0.2 -0.4 | 2.8 3.8 10.3 |
ngs 45 | -3.0 0.9 -0.6 | 6.9 6.2 14.2 |
sio 44 | -1.1 0.2 -3.5 | 2.7 3.7 14.7 |
ncl 44 | -0.4 -0.2 -0.2 | 2.4 3.1 6.9 |
---------------|---------------------------|---------------------------|
5-2-2) With respect to the Weekly Combination:
=================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 113 | 1.1 0.6 1.7 | 2.6 2.6 6.6 |
emr 46 | 1.0 -0.6 1.2 | 2.5 4.4 8.0 |
gfz 62 | -0.2 0.3 1.4 | 1.4 2.1 5.4 |
jpl 66 | -0.3 0.1 -0.1 | 1.8 1.7 8.1 |
ngs 69 | -1.9 0.0 -0.2 | 6.1 6.1 9.8 |
sio 118 | 0.3 -0.5 0.3 | 2.3 2.4 10.1 |
ncl 90 | 0.9 -0.5 2.1 | 1.1 1.4 3.6 |
ITR 48 | 0.8 -0.1 -0.3 | 3.0 4.0 10.9 |
---------------|---------------------------|---------------------------|
5-2-3) With respect to the Cumulative Combination:
=====================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 117 | -0.2 1.8 1.6 | 4.3 4.2 7.8 |
emr 47 | 0.2 -0.7 1.1 | 3.1 6.6 9.3 |
gfz 62 | -1.3 0.6 1.3 | 2.5 3.7 7.3 |
jpl 67 | -1.2 0.0 0.3 | 2.7 3.1 9.8 |
ngs 71 | -2.9 0.6 -0.1 | 7.2 7.2 12.4 |
sio 121 | -0.9 0.6 0.2 | 2.6 4.5 12.2 |
ncl 92 | -0.2 -0.2 2.3 | 2.2 3.7 5.3 |
igs 130 | -1.1 0.8 -0.1 | 2.1 2.8 6.1 |
ITR 51 | 0.0 0.1 -0.2 | 1.3 2.0 5.3 |
---------------|---------------------------|---------------------------|
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 | 0.032 -0.308 -0.029 24.9 1.3 4.1 2.29 |
emr | -0.022 -0.041 0.023 19.1 -23.3 -13.1 2.36 |
gfz | -0.027 -0.013 0.011 -1.6 -0.3 -3.3 2.40 |
jpl | -0.022 -0.030 0.004 3.2 -10.2 -22.7 2.32 |
ngs | 0.129 0.201 0.058 -14.1 15.2 22.5 2.33 |
sio | 0.013 0.015 0.091 7.8 8.6 43.8 2.06 |
ncl | -0.063 0.096 -0.242 13.5 -5.6 -8.6 1.94 |
---------------|---------------------------------------------------------------|
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 | 0.060 0.061 0.068 1.6 1.6 1.6 0.24 |
emr | 0.072 0.071 0.087 1.9 1.9 1.9 0.29 |
gfz | 0.065 0.068 0.076 1.7 1.7 1.7 0.27 |
jpl | 0.069 0.069 0.080 1.8 1.8 1.8 0.28 |
ngs | 0.059 0.060 0.067 1.6 1.6 1.5 0.24 |
sio | 0.060 0.060 0.067 1.6 1.6 1.5 0.24 |
ncl | 0.060 0.060 0.068 1.6 1.6 1.5 0.24 |
---------------|---------------------------------------------------------------|
5-4) Geocenter:
====================
| X Y Z | s X s Y s Z |
| (mm) (mm) (mm) | (mm) (mm) (mm) |
---------------|---------------------------|---------------------------|
igs | 24.4 -5.1 -14.4 | 1.9 2.5 7.5 |
---------------|---------------------------|---------------------------|
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 | --- 4.0 5.2 -.2 13.4 -.1 |
emr | --- -1.3 4.9 3.6 9.1 -2.3 |
gfz | --- -4.5 4.0 -3.5 2.0 .1 |
jpl | --- 21.3 .2 12.1 -.5 8.8 |
ngs | --- -15.7 -34.3 -118.0 26.2 -90.1 |
sio | --- -6.4 .6 -13.0 6.5 -15.5 |
ncl | --- --- --- --- --- --- |
ITR | --- --- --- --- --- --- |
BuA | --- 7.4 .5 .5 21.6 -2.4 |
---------------|------------------------------------------------------------|
5-5-2) STD :
===============
Solution | UT LOD XPO XPOR YPO YPOR |
| us us .01mas .01ma/d .01mas .01ma/d |
---------------|------------------------------------------------------------|
cod | --- 8.3 1.4 8.9 4.3 9.4 |
emr | --- 12.2 6.6 32.6 13.6 37.9 |
gfz | --- 12.3 4.7 19.6 3.9 14.9 |
jpl | --- 15.8 4.9 21.4 4.0 16.4 |
ngs | --- 27.3 7.4 28.1 10.4 36.8 |
sio | --- 6.0 4.1 13.4 7.6 12.7 |
ncl | --- --- --- --- --- --- |
ITR | --- --- --- --- --- --- |
BuA | --- 9.7 4.7 5.5 7.0 11.9 |
---------------|------------------------------------------------------------|
5-6) Outliers:
===================
Thresholds set at 5 sigmas and 50 mm.
Solution Solution | Station | N E U |
Minus |code id soln| (mm) (mm) (mm)|
-----------------------------------------|------------|-----------------------|
| | |
cod11107.snx jpl11107.snx |INEG A ----| -5.8 0.2 59.4|
| | |
cod11107.snx ngs11107.snx |BAKO A ----| 2.9 12.0 -72.5|
| | |
gfz11107.snx jpl11107.snx |INEG A ----| -1.8 4.2 54.4|
| | |
jpl11107.snx sio11107.snx |INEG A ----| 1.0 -3.3 -65.1|
| | |
jpl11107.snx ncl1110g.snx |INEG A ----| 4.7 -0.5 -51.9|
| | |
ngs11107.snx sio11107.snx |BAKO A ----| -7.8 -20.0 61.4|
| | |
ngs11107.snx ncl1110g.snx |BAKO A ----| -7.1 -20.4 70.1|
| | |
IGS01P15.snx cod11107.snx |BILI A ----| 39.8 7.7 -134.8|
| | |
IGS01P15.snx gfz11107.snx |BILI A ----| 41.6 5.3 -135.6|
| | |
IGS01P15.snx gfz11107.snx |COCO A ----| 4.3 -28.3 4.5|
| | |
IGS01P15.snx gfz11107.snx |SSIA A ----| 17.0 -11.1 -3.9|
| | |
IGS01P15.snx jpl11107.snx |COCO A ----| 3.3 -27.8 11.1|
| | |
IGS01P15.snx sio11107.snx |BILI A ----| 42.3 9.0 -119.0|
| | |
IGS01P15.snx igs01P1110.snx |ANKR A ----| -9.5 12.8 -4.4|
IGS01P15.snx igs01P1110.snx |COCO A ----| 3.0 -26.5 1.5|
IGS01P15.snx igs01P1110.snx |JAB1 A ----| 12.0 -7.7 -7.6|
IGS01P15.snx igs01P1110.snx |YAKA A ----| -10.8 6.7 4.8|
-----------------------------------------|------------|-----------------------|
5-7) Conflicts:
====================
IERS DOMES NO cod emr gfz jpl ngs sio IGS igs
============= ====== ====== ====== ====== ====== ====== ====== ======
50103M108 TIDB A TIDB A TIDB A TIDB A TID2 A TID2 A TIDB A TIDB A
42005M001 GALA A GALA A GALA A GALA B GALA A GALA A GALA A
50107M004 YAR1 A YAR1 A YAR1 A YAR1 A YAR1 A YAR1 A YAR1 A YAR1 A
YAR2 A
42202M005 AREQ A AREQ A AREQ A AREQ A AREQ B AREQ A AREQ A AREQ A
13407S012 MADR A MADR A MADR A MAD2 A MADR A MADR A
12353M001 YAKZ A YAKZ A YAKZ A YAKA A
40114M001 NRC1 A NRC1 A NRC1 A NRC1 A NRC1 A NRC1 A
NRC2 A
40405S031 GOLD A GOLD A GOL2 A GOL2 A GOLD A GOLD A
MISSING IERS DOMES NOS AT gfz:
-----------------------------
BISH A
MISSING IERS DOMES NOS AT sio:
-----------------------------
LHAV A
IERS DOMES NO ncl IGS igs
============= ====== ====== ======
12353M001 YAKZ A YAKA A
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