[IGSREPORT-7360] Wk 1068 IGS SINEX Combination
Remi Ferland
ferland at geod.nrcan.gc.ca
Thu Jul 13 14:23:03 PDT 2000
******************************************************************************
IGS Electronic Report 13 Jul 14:23:06 PDT 2000 Message Number 7360
******************************************************************************
Author: R. Ferland
===================================================================
Combined AC solution for GPS week 1068 - 00/06/25 to 00/07/01
===================================================================
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
igs00P1068.snx Combined weekly solution.
igs00P1068.erp Daily Earth Rotation Parameters.
igs00p02.erp Daily Earth Rotation Parameters since GPS week 1013.
IGS00P26.snx Cumulative Combined solution.
igs00P1068.sum This file.
igs00P1068.itr Residuals between the AC and the IGS97 for the RF stations.
igs00P1068.res Residuals between the AC and the Combined Weekly solution.
IGS00P26.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 = igs00P1068.snx
IGS = IGS00P26.snx
JPL = jpl1068g.snx
jpl = jpl10687.snx
BuA = IERS Bulletin A
JPL 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:
After unconstraining:
esa ZWEN
gfz ZWEN
sio ZWEN
4-1) Starting with GPS week 1065, the solutions are aligned to the
IGS00P04_RS51.SNX realization of ITRF97.
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 | 43 | 36.600 | 1.001 | 36.627 |
emr | 49 | 29 | 3.102 | 0.999 | 3.099 |
esa | 48 | 33 | 11.062 | 1.000 | 11.065 |
gfz | 79 | 39 | 24.672 | 1.254 | 30.934 |
jpl | 63 | 31 | 4.394 | 1.001 | 4.398 |
sio | 139 | 43 | 2.378 | 1.000 | 2.378 |
JPL | 144 | 45 | 2.840 | 1.001 | 2.843 |
mit | 150 | 42 | 2.595 | 2.042 | 5.298 |
ncl | 98 | 43 | 2.736 | 1.097 | 3.001 |
igs | 135 | 45 | 1.510 | 0.982 | 1.483 |
---------------|-----|-----|---------------|---------------|---------------|
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 | -0.7 0.1 0.3 | 2.7 3.3 11.0 |
emr 28 | -0.1 0.2 0.7 | 3.1 3.8 12.0 |
esa 32 | -0.6 -0.4 -0.7 | 4.6 5.3 12.6 |
gfz 38 | 1.3 -0.1 0.0 | 3.0 3.0 9.6 |
jpl 30 | 0.2 0.4 0.1 | 2.6 4.4 11.1 |
sio 42 | 1.0 -0.2 -0.8 | 3.0 3.3 9.6 |
JPL 44 | 0.6 0.0 0.0 | 2.3 2.8 9.0 |
mit 41 | 0.8 0.6 -0.1 | 4.7 4.5 8.0 |
ncl 42 | 0.4 0.1 -0.1 | 2.7 3.1 7.2 |
---------------|---------------------------|---------------------------|
5-2-2) With respect to the Weekly Combination:
=================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 125 | -1.2 0.9 0.6 | 2.5 2.5 9.9 |
emr 47 | -1.0 1.2 1.5 | 2.4 3.8 6.8 |
esa 48 | -1.6 -1.0 1.5 | 4.4 4.9 9.6 |
gfz 73 | 1.0 -0.2 -0.4 | 2.0 2.0 6.5 |
jpl 59 | -0.6 -0.2 -0.4 | 1.6 1.9 6.0 |
sio 125 | 0.6 -0.7 -0.1 | 1.8 2.4 5.1 |
JPL 134 | 0.1 0.1 0.7 | 1.1 0.7 5.3 |
mit 125 | -0.4 1.4 1.0 | 2.0 1.9 4.1 |
ncl 93 | 0.1 -0.1 0.0 | 0.9 1.4 3.5 |
ITR 44 | -0.6 0.0 -0.3 | 2.3 3.2 8.9 |
---------------|---------------------------|---------------------------|
5-2-3) With respect to the Cumulative Combination:
=====================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 125 | -1.2 1.0 -0.8 | 3.6 3.9 12.0 |
emr 48 | -0.5 0.5 0.9 | 3.7 5.8 11.3 |
esa 48 | -1.8 0.1 0.5 | 5.1 6.1 12.2 |
gfz 74 | 1.2 -0.9 -2.7 | 3.4 4.5 11.5 |
jpl 59 | -0.5 0.2 -1.1 | 3.0 3.5 10.2 |
sio 126 | 0.7 -0.8 -1.5 | 3.2 4.7 7.8 |
JPL 134 | 0.0 0.1 -0.8 | 2.9 3.3 10.0 |
mit 126 | -0.4 1.1 -0.7 | 4.0 3.7 8.3 |
ncl 93 | 0.0 -0.1 -1.4 | 2.8 3.3 8.5 |
igs 135 | 0.0 0.1 -1.4 | 2.7 3.2 7.5 |
ITR 51 | 0.0 0.1 -0.1 | 0.6 0.9 2.3 |
---------------|---------------------------|---------------------------|
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 | 0.038 -0.030 0.039 8.5 -5.6 -11.9 2.75 |
emr | -0.046 -0.054 -0.001 -0.5 -5.6 -12.0 1.75 |
esa | -0.013 0.041 -0.015 -7.9 23.6 -13.9 0.77 |
gfz | -0.073 0.001 0.075 -1.7 1.5 -3.0 1.33 |
jpl | -0.040 -0.046 -0.056 5.4 11.1 -23.2 2.07 |
sio | -0.048 -0.070 0.358 1.5 -0.2 25.5 1.87 |
JPL | -0.040 -0.020 0.054 -1.4 1.9 -4.8 2.02 |
mit | 0.034 -0.019 -0.036 -0.0 -1.2 -0.6 1.94 |
ncl | -0.202 0.108 -0.286 12.7 -4.3 -8.3 1.60 |
---------------|---------------------------------------------------------------|
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 0.063 0.068 1.6 1.6 1.6 0.25 |
emr | 0.074 0.074 0.084 1.9 1.9 1.9 0.30 |
esa | 0.071 0.071 0.076 1.8 1.8 1.8 0.28 |
gfz | 0.064 0.065 0.072 1.7 1.7 1.7 0.26 |
jpl | 0.070 0.071 0.079 1.8 1.8 1.8 0.29 |
sio | 0.061 0.062 0.068 1.6 1.6 1.6 0.25 |
JPL | 0.059 0.061 0.067 1.6 1.5 1.5 0.24 |
mit | 0.062 0.063 0.071 1.6 1.6 1.6 0.25 |
ncl | 0.060 0.062 0.069 1.6 1.6 1.6 0.25 |
---------------|---------------------------------------------------------------|
5-4) Geocenter:
====================
| X Y Z | s X s Y s Z |
| (mm) (mm) (mm) | (mm) (mm) (mm) |
---------------|---------------------------|---------------------------|
igs | 3.4 7.2 -17.0 | 7.3 7.3 9.6 |
---------------|---------------------------|---------------------------|
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 | --- 3.5 2.3 2.5 -2.9 -.7 |
emr | --- -2.5 -3.6 44.4 -9.0 -11.3 |
esa | --- -5.2 2.3 3.6 -23.9 -1.0 |
gfz | --- -16.2 .6 -5.3 8.4 .2 |
jpl | --- -14.1 .1 -16.5 1.7 4.1 |
sio | --- 19.4 .3 -10.8 2.9 -7.7 |
JPL | --- --- --- --- --- --- |
mit | --- 4.2 2.5 -.8 -3.3 .8 |
ncl | --- --- --- --- --- --- |
ITR | --- --- --- --- --- --- |
BuA | --- 9.8 .9 1.5 26.1 -2.2 |
---------------|------------------------------------------------------------|
5-5-2) STD :
===============
Solution | UT LOD XPO XPOR YPO YPOR |
| us us .01mas .01ma/d .01mas .01ma/d |
---------------|------------------------------------------------------------|
cod | --- 9.1 5.6 8.1 2.2 4.5 |
emr | --- 17.6 5.1 45.8 8.5 63.6 |
esa | --- 14.0 4.7 12.9 3.2 17.1 |
gfz | --- 10.1 2.9 5.1 3.8 4.8 |
jpl | --- 23.9 5.0 32.6 4.2 21.3 |
sio | --- 21.3 4.4 15.6 5.2 10.3 |
JPL | --- --- --- --- --- --- |
mit | --- 8.2 2.0 1.3 1.3 3.6 |
ncl | --- --- --- --- --- --- |
ITR | --- --- --- --- --- --- |
BuA | --- 9.3 3.9 9.1 9.5 17.9 |
---------------|------------------------------------------------------------|
5-6) Outliers:
===================
Thresholds set at 5 sigmas and 50 mm.
Solution Solution | Station | N E U |
Minus |code id soln| (mm) (mm) (mm)|
-----------------------------------------|------------|-----------------------|
| | |
IGS00P04_RS51.snx JPL1068g.snx |ZWEN A ----| 40.8 -46.2 0.2|
| | |
IGS00P04_RS51.snx ncl1068g.snx |ZWEN A ----| 37.0 -43.0 8.7|
| | |
IGS00P25.snx jpl10687.snx |ARTU A ----| -0.2 0.4 -42.8|
IGS00P25.snx jpl10687.snx |COCO A ----| 9.3 -28.4 19.2|
| | |
IGS00P25.snx sio10687.snx |ANKR A ----| -9.6 20.6 -15.5|
| | |
IGS00P25.snx JPL1068g.snx |COCO A ----| 9.0 -28.2 -3.5|
| | |
IGS00P25.snx mit1068g.snx |ANKR A ----| -13.3 24.0 -13.4|
IGS00P25.snx mit1068g.snx |COCO A ----| 7.2 -28.4 0.1|
IGS00P25.snx mit1068g.snx |MADR A ----| 4.0 15.6 15.6|
| | |
IGS00P25.snx ncl1068g.snx |COCO A ----| 8.0 -30.5 5.0|
| | |
igs00P1068.snx mit1068g.snx |METS A ----| -0.2 3.7 27.2|
| | |
IGS00P25.snx igs00P1068.snx |COCO A ----| 7.1 -27.3 -4.5|
-----------------------------------------|------------|-----------------------|
5-7) Conflicts:
====================
IERS DOMES NO cod emr esa gfz jpl sio IGS igs
============= ====== ====== ====== ====== ====== ====== ====== ======
50103M108 TID2 A TID2 A TID2 A TID2 A TID2 A TIDB A TIDB A
31303M002 MAS1 A MAS1 A MASP A MAS1 A MAS1 A MAS1 A MAS1 A
22306M002 IISC A IISC B IISC A IISC A IISC A IISC A IISC A
12353M001 YAKZ A YAKZ A YAKZ A YAKA A YAKA A
42005M001 GALA A GALA B GALA A GALA A GALA A GALA A GALA A
13407S012 MAD2 A MAD2 A MADR A MADR A
40114M001 NRC1 A NRC1 A NRC1 A NRC1 A NRC1 A
NRC2 A
40405S031 GOL2 A GOL2 A GOL2 A GOL2 A GOL2 A GOLD A GOLD A
MISSING IERS DOMES NOS AT gfz:
-----------------------------
BISH A
IERS DOMES NO JPL mit ncl IGS igs
============= ====== ====== ====== ====== ======
40405S031 GOL2 A GOL2 A GOL2 A GOLD A GOLD A
13407S012 MAD2 A MAD2 A MADR A MADR A
31303M002 MAS1 A MAS1 A MAS1 A MAS1 A
31303M001 MAS1 A
12309M002 MDVO A MDVO A MDVO A
12309M001 MDVO A
40114M001 NRC1 A NRC1 A NRC1 A NRC1 A NRC1 A
NRC2 A NRC2 A
50103M108 TID2 A TID2 A TID2 A TIDB A TIDB A
12353M001 YAKZ A YAKZ A YAKZ A YAKA A YAKA A
MISSING IERS DOMES NOS AT mit:
-----------------------------
BISH A
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