[IGSREPORT-7876] Wk 1093 IGS SINEX Combination
Remi Ferland
ferland at geod.nrcan.gc.ca
Thu Jan 4 07:41:51 PST 2001
******************************************************************************
IGS Electronic Report 04 Jan 07:42:09 PST 2001 Message Number 7876
******************************************************************************
Author: R. Ferland , D. Hutchison
===================================================================
Combined AC solution for GPS week 1093 - 00/12/17 to 00/12/23
===================================================================
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
igs00P1093.snx Combined weekly solution.
igs00P1093.erp Daily Earth Rotation Parameters.
igs00p02.erp Daily Earth Rotation Parameters since GPS week 1013.
IGS00P51.snx Cumulative Combined solution.
igs00P1093.sum This file.
igs00P1093.itr Residuals between the AC and the IGS97 for the RF stations.
igs00P1093.res Residuals between the AC and the Combined Weekly solution.
IGS00P51.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 = igs00P1093.snx
IGS = IGS00P51.snx
BuA = IERS Bulletin A
mit 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 | 132 | 45 | 40.377 | 0.998 | 40.297 |
emr | 49 | 39 | 3.402 | 0.999 | 3.400 |
esa | 55 | 39 | 12.331 | 0.999 | 12.322 |
gfz | 73 | 38 | 24.489 | 0.999 | 24.464 |
jpl | 72 | 34 | 4.294 | 0.999 | 4.288 |
mit | 148 | 46 | 4.796 | 0.994 | 4.767 |
igs | 134 | 47 | 1.193 | 0.999 | 1.192 |
---------------|-----|-----|---------------|---------------|---------------|
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 44 | -0.5 0.6 -0.7 | 4.2 4.8 9.5 |
emr 37 | -3.6 -0.4 0.8 | 4.3 7.2 9.1 |
esa 37 | -3.2 0.1 0.2 | 6.8 7.4 13.4 |
gfz 37 | -1.5 -0.8 0.0 | 3.6 5.4 8.2 |
jpl 33 | -2.0 -0.4 0.1 | 3.5 4.2 10.4 |
mit 45 | -0.6 -0.4 -0.7 | 3.3 4.0 7.8 |
---------------|---------------------------|---------------------------|
5-2-2) With respect to the Weekly Combination:
=================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 123 | 1.2 1.0 -0.4 | 2.6 3.1 6.9 |
emr 44 | -2.0 0.8 0.4 | 2.4 4.9 5.6 |
esa 52 | -1.5 0.5 0.2 | 5.3 5.1 11.7 |
gfz 66 | 0.2 -0.5 0.9 | 1.8 2.2 5.2 |
jpl 64 | -0.5 0.3 0.1 | 2.1 2.0 4.8 |
mit 127 | 1.2 0.0 -0.2 | 1.6 1.1 4.1 |
ITR 46 | 1.6 0.4 -0.1 | 3.4 3.7 7.9 |
---------------|---------------------------|---------------------------|
5-2-3) With respect to the Cumulative Combination:
=====================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 126 | -0.7 0.9 -0.2 | 4.1 5.2 10.1 |
emr 46 | -3.8 0.7 1.8 | 3.8 6.3 8.6 |
esa 55 | -3.7 1.0 -0.2 | 6.2 7.2 11.3 |
gfz 68 | -1.6 -0.3 2.2 | 3.1 4.3 9.1 |
jpl 65 | -2.1 0.2 0.8 | 3.3 3.5 9.7 |
mit 129 | -0.6 -0.1 0.4 | 3.2 3.1 8.6 |
igs 134 | -1.8 -0.2 0.7 | 2.9 3.5 7.6 |
ITR 51 | -0.1 0.1 -0.2 | 1.0 1.6 4.4 |
---------------|---------------------------|---------------------------|
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 | 0.009 -0.020 0.019 -4.3 7.0 6.6 2.20 |
emr | -0.040 -0.008 0.005 9.3 -4.0 -20.9 1.81 |
esa | 0.059 0.025 -0.002 -18.6 28.7 14.2 2.56 |
gfz | -0.056 -0.044 0.098 0.0 -0.7 -3.3 1.46 |
jpl | 0.020 -0.037 -0.020 12.2 2.2 -36.4 2.13 |
mit | -0.010 0.000 -0.008 -0.7 0.0 -0.6 1.97 |
---------------|---------------------------------------------------------------|
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 | 0.059 0.062 0.066 1.6 1.6 1.5 0.24 |
emr | 0.065 0.065 0.073 1.7 1.7 1.7 0.26 |
esa | 0.069 0.067 0.071 1.7 1.7 1.7 0.27 |
gfz | 0.065 0.066 0.073 1.7 1.7 1.7 0.26 |
jpl | 0.069 0.068 0.078 1.8 1.8 1.8 0.28 |
mit | 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 | 3.0 12.3 -25.5 | 6.2 6.4 8.4 |
---------------|---------------------------|---------------------------|
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 | --- -1.1 -27.1 -.2 7.7 -.6 |
emr | --- -2.3 -10.9 6.2 1.5 -29.7 |
esa | --- 5.1 -3.6 5.2 8.8 -3.8 |
gfz | --- -8.8 7.9 -3.1 -7.2 -3.8 |
jpl | --- 12.5 4.1 -10.1 7.4 -8.0 |
mit | --- 5.5 -8.3 .8 4.1 -1.7 |
ITR | --- --- --- --- --- --- |
BuA | --- 13.7 -3.7 -1.9 30.3 -.1 |
---------------|------------------------------------------------------------|
5-5-2) STD :
===============
Solution | UT LOD XPO XPOR YPO YPOR |
| us us .01mas .01ma/d .01mas .01ma/d |
---------------|------------------------------------------------------------|
cod | --- 9.4 5.3 13.1 2.1 8.9 |
emr | --- 14.8 8.4 22.3 10.5 17.0 |
esa | --- 10.3 13.0 21.5 5.0 11.4 |
gfz | --- 7.6 4.5 5.3 5.3 13.4 |
jpl | --- 22.3 3.5 27.6 3.3 29.6 |
mit | --- 12.7 1.9 3.9 3.4 9.4 |
ITR | --- --- --- --- --- --- |
BuA | --- 30.0 8.5 13.4 1.9 8.0 |
---------------|------------------------------------------------------------|
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 jpl10937.snx |ALGO A ----| -1.7 13.1 8.3|
| | |
emr10937.snx esa10937.snx |HRAO A ----| -2.2 -4.4 -59.1|
emr10937.snx esa10937.snx |YAR1 A ----| 0.8 3.1 -51.7|
| | |
IGS00P50.snx cod10937.snx |BILI A ----| 28.3 1.7 -95.9|
| | |
IGS00P50.snx gfz10937.snx |BILI A ----| 26.6 3.3 -100.4|
IGS00P50.snx gfz10937.snx |COCO A ----| 4.4 -37.0 -14.5|
| | |
IGS00P50.snx jpl10937.snx |BILI A ----| 27.0 5.9 -93.6|
IGS00P50.snx jpl10937.snx |COCO A ----| 4.8 -32.1 -4.8|
| | |
IGS00P50.snx mit1093g.snx |BILI A ----| 28.3 3.3 -98.4|
IGS00P50.snx mit1093g.snx |COCO A ----| 8.5 -37.8 -1.0|
| | |
IGS00P50.snx mit1093g.snx |ANKR A ----| -8.7 17.0 -24.8|
| | |
IGS00P50.snx igs00P1093.snx |ALGO A ----| -0.6 11.7 5.4|
IGS00P50.snx igs00P1093.snx |ANKR A ----| -10.7 17.1 -18.9|
IGS00P50.snx igs00P1093.snx |TSKB A ----| -10.0 -7.8 0.4|
-----------------------------------------|------------|-----------------------|
5-7) Conflicts:
====================
IERS DOMES NO cod emr esa gfz jpl IGS igs
============= ====== ====== ====== ====== ====== ====== ======
12353M001 YAKZ A YAKA A YAKA A
40405S031 GOLD A GOL2 A GOLD A GOL2 A GOLD A GOLD A
40114M001 NRC1 A NRC1 A NRC1 A NRC1 A NRC1 A NRC1 A
NRC2 A
50103M108 TIDB A TIDB A TID2 A TIDB A TIDB A TIDB A TIDB A
31303M002 MAS1 A MASP A MAS1 A MAS1 A MAS1 A
22306M002 IISC A IISC B IISC A IISC A IISC A IISC A
MISSING IERS DOMES NOS AT gfz:
-----------------------------
BISH A
IERS DOMES NO mit IGS igs
============= ====== ====== ======
31303M001 MAS1 A
31303M002 MAS1 A MAS1 A
40114M001 NRC2 A NRC1 A NRC1 A
40405S031 GOLD A GOLD A GOLD A
GOL2 A
50103M108 TIDB A TIDB A TIDB A
TID2 A
12353M001 YAKZ A YAKA A YAKA A
12309M001 MDVO A
12309M002 MDVO A MDVO A
MISSING IERS DOMES NOS AT mit:
-----------------------------
BISH A
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