[IGSREPORT-7084] Wk 1055 IGS SINEX Combination
David Hutchison
hutch at geod.nrcan.gc.ca
Thu Apr 13 15:45:47 PDT 2000
******************************************************************************
IGS Electronic Report 13 Apr 15:55:37 PDT 2000 Message Number 7084
******************************************************************************
Author: R. Ferland , D. Hutchison
===================================================================
Combined AC solution for GPS week 1055 - 00/03/26 to 00/04/01
===================================================================
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
igs00P1055.snx Combined weekly solution.
igs00P1055.erp Daily Earth Rotation Parameters.
IGS00P13.snx Cumulative Combined solution.
igs00P1055.sum This file.
igs00P1055.itr Residuals between the AC and the ITRF97 for the RF stations.
igs00P1055.res Residuals between the AC and the Combined Weekly solution.
IGS00P13.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
ITRF97 Reference Frame (RF) stations at the current epoch.
ftp://igscb.jpl.nasa.gov/igscb/station/coord/ITRF97_IGS_RS51.SNX.Z
3-4) The AC are compared to ITRF, 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 ITRF97 of the current
epoch using a 7-parameters transformation. The singular cumulative
combined solution is aligned to the ITRF97 of the reference epoch
using a 14-parameters transformation and the 51 ITRF station positions
and velocities.
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:
===========
igs = igs00P1055.snx
IGS = IGS00P13.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).
New stations in the cumulative solution IGS00P13.snx
TRAB A ----
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 | 111 | 40 | 28.986 | 0.998 | 28.928 |
emr | 41 | 21 | 3.831 | 0.972 | 3.722 |
esa | 49 | 36 | 10.151 | 1.001 | 10.160 |
gfz | 67 | 38 | 16.214 | 1.000 | 16.216 |
jpl | 69 | 32 | 4.243 | 1.000 | 4.241 |
ngs | 71 | 48 | 17.849 | 1.000 | 17.850 |
sio | 125 | 46 | 1.681 | 1.000 | 1.682 |
ncl | 93 | 47 | 2.570 | 1.001 | 2.571 |
igs | 136 | 48 | 1.528 | 1.012 | 1.546 |
---------------|-----|-----|---------------|---------------|---------------|
5-2) Solution Residuals weighted Average & R.M.S. :
========================================================
5-2-1) With respect to ITRF97 Reference Frame stations:
=========================================================
Solution | Weighted Average (mm) | R.M.S. (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod | -0.9 -0.8 -0.2 | 4.0 4.3 10.9 |
emr | -3.7 -0.2 2.0 | 6.7 11.7 16.1 |
esa | -1.4 -1.4 0.7 | 6.4 8.9 15.1 |
gfz | -1.8 -0.2 1.3 | 4.5 5.3 14.0 |
jpl | -1.8 -1.0 -0.1 | 4.2 6.8 14.1 |
ngs | -1.8 -0.3 1.5 | 11.0 8.0 15.7 |
sio | -2.1 -0.4 0.8 | 5.2 6.5 16.0 |
ncl | 0.2 -0.5 0.5 | 3.0 4.3 6.9 |
---------------|---------------------------|---------------------------|
5-2-2) With respect to Weekly Combination:
============================================
Solution | Weighted Average (mm) | R.M.S. (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod | -0.2 0.4 -1.7 | 3.3 2.8 10.4 |
emr | -0.5 -1.2 3.6 | 4.7 9.0 14.2 |
esa | 0.4 -1.3 -1.9 | 6.4 5.2 9.9 |
gfz | 0.0 0.6 -0.7 | 1.9 1.9 5.7 |
jpl | 0.5 -1.1 1.8 | 2.4 3.2 7.8 |
ngs | 0.2 0.4 0.3 | 8.8 6.0 8.1 |
sio | -0.2 0.5 -0.5 | 2.6 2.4 5.1 |
ncl | 1.8 0.1 2.5 | 2.7 2.4 8.2 |
ITR | 1.7 0.9 -1.0 | 3.8 6.0 13.4 |
---------------|---------------------------|---------------------------|
5-2-3) With respect to Cumulative Combination:
================================================
Solution | Weighted Average (mm) | R.M.S. (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod | -2.1 -0.2 -4.8 | 5.0 4.1 12.0 |
emr | -2.2 -0.8 1.9 | 5.6 9.6 17.0 |
esa | -1.1 -2.1 -4.0 | 7.2 7.3 13.6 |
gfz | -1.4 0.3 -3.7 | 3.5 4.1 9.2 |
jpl | -0.8 -1.1 -2.0 | 3.2 4.6 10.6 |
ngs | -1.3 0.0 -1.9 | 8.9 7.1 11.4 |
sio | -1.8 0.3 -3.0 | 4.0 4.4 9.7 |
ncl | 0.4 -0.2 0.1 | 3.3 3.4 8.4 |
igs | -1.7 -0.4 -2.7 | 3.2 3.8 8.0 |
ITR | 0.6 0.3 -1.5 | 3.0 3.7 11.7 |
---------------|---------------------------|---------------------------|
5-3) 7-Parameters Transformation: AC ----> ITRF97_IGS_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 | 0.012 0.037 -0.124 5.5 -4.2 2.9 2.85 |
emr | 0.056 0.006 0.033 -0.9 48.8 27.4 2.89 |
esa | 0.073 -0.077 -0.044 -2.1 20.9 0.0 2.77 |
gfz | -0.015 0.007 0.004 -0.9 1.4 -3.1 1.77 |
jpl | 0.022 -0.020 0.105 -4.2 10.0 -30.2 2.63 |
ngs | -0.044 0.201 0.002 -14.4 6.0 39.1 3.09 |
sio | -0.017 -0.159 0.170 7.2 4.1 32.5 3.18 |
ncl | 0.000 -0.013 0.042 -0.5 1.0 -2.8 0.97 |
---------------|---------------------------------------------------------------|
5-3-2) Sigmas :
==================
Solution | R X R Y R Z T X T Y T Z SCL |
| (mas) (mas) (mas) (mm) (mm) (mm) (ppb) |
---------------|---------------------------------------------------------------|
cod | 0.063 0.063 0.076 1.6 1.6 1.6 0.26 |
emr | 0.088 0.092 0.095 2.3 2.3 2.3 0.36 |
esa | 0.070 0.070 0.076 1.8 1.8 1.8 0.28 |
gfz | 0.064 0.065 0.077 1.7 1.7 1.7 0.26 |
jpl | 0.068 0.072 0.081 1.8 1.8 1.8 0.29 |
ngs | 0.057 0.059 0.065 1.5 1.5 1.5 0.23 |
sio | 0.058 0.059 0.067 1.5 1.5 1.5 0.24 |
ncl | 0.058 0.059 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 | -3.1 8.9 -15.0 | 7.8 7.8 10.4 |
---------------|---------------------------|---------------------------|
5-5) ERP Residuals Weighted Average & R.M.S. :
===================================================
5-5-1) Weighted Average :
============================
Solution | UT LOD XPO XPOR YPO YPOR |
| us us .01mas .01ma/d .01mas .01ma/d |
---------------|------------------------------------------------------------|
cod | --- -24.2 -4.9 -.7 -7.3 2.2 |
emr | --- -35.7 -2.4 30.2 -4.0 -64.0 |
esa | --- -13.6 6.5 1.1 -18.4 -2.1 |
gfz | --- 1.0 -.7 2.2 11.6 -.7 |
jpl | --- -32.5 7.5 -7.4 8.9 -26.8 |
ngs | --- 289.6 -19.3 -172.9 11.9 -267.2 |
sio | --- -1.9 6.5 21.9 12.8 -9.1 |
ncl | --- --- --- --- --- --- |
ITR | --- --- --- --- --- --- |
BuA | --- -17.4 1.3 1.5 18.7 1.9 |
---------------|------------------------------------------------------------|
5-5-2) R.M.S. :
==================
Solution | UT LOD XPO XPOR YPO YPOR |
| us us .01mas .01ma/d .01mas .01ma/d |
---------------|------------------------------------------------------------|
cod | --- 24.9 5.9 12.5 9.8 13.0 |
emr | --- 48.5 12.6 45.8 17.2 82.5 |
esa | --- 21.4 12.3 34.7 19.2 49.5 |
gfz | --- 21.7 8.8 19.7 12.8 17.5 |
jpl | --- 64.3 9.5 30.7 11.3 55.6 |
ngs | --- 319.8 28.2 177.7 16.1 294.4 |
sio | --- 11.2 15.7 39.6 13.5 17.2 |
ncl | --- --- --- --- --- --- |
ITR | --- --- --- --- --- --- |
BuA | --- 19.8 7.4 18.8 20.7 16.0 |
---------------|------------------------------------------------------------|
5-6) Outliers:
===================
Thresholds set at 5 sigmas and 50 mm.
Solution Solution | Station | N E U |
Minus |code id soln| (mm) (mm) (mm)|
-----------------------------------------|------------|-----------------------|
| | |
ITRF97_IGS_RS51.snx emr10557.snx |MCM4 A ----| -12.4 3.9 -53.5|
| | |
ITRF97_IGS_RS51.snx esa10557.snx |MALI A ----| -10.5 15.0 -72.8|
ITRF97_IGS_RS51.snx esa10557.snx |MCM4 A ----| 7.1 0.3 -64.2|
| | |
cod10557.snx esa10557.snx |NTUS A ----| -1.5 21.8 -51.1|
| | |
cod10557.snx ngs10557.snx |ASC1 A ----| -11.4 6.8 -54.2|
| | |
cod10557.snx sio10557.snx |MDVO A ----| -3.8 -0.7 -59.7|
| | |
esa10557.snx ngs10557.snx |EISL A ----| -30.9 -7.9 -54.9|
| | |
ngs10557.snx sio10557.snx |BAKO A ----| 8.5 -14.8 -61.3|
| | |
ngs10557.snx ncl1055g.snx |ASC1 A ----| 9.6 -16.9 51.9|
ngs10557.snx ncl1055g.snx |BAKO A ----| 17.5 -8.6 -67.7|
| | |
igs00P1054.snx emr10557.snx |THTI A ----| -4.7 26.1 -63.1|
| | |
igs00P1054.snx sio10557.snx |RIOP A ----| -20.7 179.7 177.1|
| | |
IGS00P12.snx igs00P1055.snx |BAKO A ----| -1.4 0.4 -60.8|
-----------------------------------------|------------|-----------------------|
5-7) Conflicts:
===========================
5-7-1) Station Name Conflicts:
=============================
IERS DOMES NO cod emr esa gfz jpl ngs sio IGS igs
============= ====== ====== ====== ====== ====== ====== ====== ====== ======
40405S031 GOL2 A GOL2 A GOL2 A GOL2 A GOL2 A GOLD A GOLD A
31303M002 MAS1 A MAS1 A MASP A MAS1 A MAS1 A MAS1 A MAS1 A MAS1 A MAS1 A
12353M001 YAKZ A YAKZ A YAKZ A YAKA A YAKA A
42005M001 GALA A GALA A GALA A GALA B GALA A GALA A GALA A
40114M001 NRC1 A NRC1 A NRC1 A NRC1 A NRC1 A NRC1 A NRC1 A
NRC2 A
42202M005 AREQ A AREQ A AREQ A AREQ A AREQ A AREQ B AREQ A AREQ A AREQ A
50103M108 TID2 A TID2 A TID2 A TID2 A TID2 A TIDB A TIDB A
22306M002 IISC B IISC B IISC A IISC A IISC A
13407S012 MAD2 A MADR A MADR A
MISSING IERS DOMES NOS AT gfz:
-----------------------------
BISH A
MISSING IERS DOMES NOS AT sio:
-----------------------------
DRAG A
IERS DOMES NO ncl IGS igs
============= ====== ====== ======
40405S031 GOL2 A GOLD A GOLD A
50103M108 TID2 A TIDB A TIDB A
12353M001 YAKZ A YAKA A YAKA A
5-7-2) Station Antenna Conflicts:
================================
_______________________
|Enforcing these aliases|
|_______________________|
GOLD A: GOL2 A
YAKA A: YAKZ A
TIDB A: TID2 A
MAS1 A: MASP A
IISC A: IISC B
NRC1 A: NRC2 A
AREQ A: AREQ B
GALA A: GALA B
MADR A: MAD2 A
ABBREVIATIONS:
-------------
L1: L1 Offset
L2: L2 Offset
ECC: Eccentricity
-N: NORTH (Latitude)
-E: EAST (Longitude)
-U: UP (Vertical)
Compare to file IGS.SNX (IGS).
Antenna Conflicts in file cod10557.snx (cod).
------- --------- -- ----
STN L1-U L1-N L1-E L2-U L2-N L2-E ECC-U ECC-N ECC-E
AGY CODE PT (M.) (M.) (M.) (M.) (M.) (M.) (M.) (M.) (M.)
=== ==== == ==== ==== ==== ==== ==== ==== ==== ==== ====
cod MDVO A .0780 .0000 -.0030 .0744 -.0031 -.0013 .1456 .0000 .0000
IGS MDVO A .0960 -.0016 .0009 .0944 .0016 .0041 .1456 .0000 .0000
Antenna Conflicts in file ngs10557.snx (ngs).
------- --------- -- ----
STN L1-U L1-N L1-E L2-U L2-N L2-E ECC-U ECC-N ECC-E
AGY CODE PT (M.) (M.) (M.) (M.) (M.) (M.) (M.) (M.) (M.)
=== ==== == ==== ==== ==== ==== ==== ==== ==== ==== ====
ngs BAKO A .0757 .0000 .0000 .0745 .0000 .0000 1.6760 .0000 .0000
IGS BAKO A .0780 .0000 -.0030 .0744 -.0031 -.0013 1.6160 .0000 .0000
Antenna Conflicts in file sio10557.snx (sio).
------- --------- -- ----
STN L1-U L1-N L1-E L2-U L2-N L2-E ECC-U ECC-N ECC-E
AGY CODE PT (M.) (M.) (M.) (M.) (M.) (M.) (M.) (M.) (M.)
=== ==== == ==== ==== ==== ==== ==== ==== ==== ==== ====
sio BAKO A .0780 .0000 -.0030 .0744 -.0031 -.0013 1.5560 .0000 .0000
IGS BAKO A .0780 .0000 -.0030 .0744 -.0031 -.0013 1.6160 .0000 .0000
sio MDVO A .1100 .0000 .0000 .1280 .0000 .0000 .0814 .0000 .0000
IGS MDVO A .0960 -.0016 .0009 .0944 .0016 .0041 .1456 .0000 .0000
The following files have no antenna conflicts:
- emr10557.snx (emr)
- esa10557.snx (esa)
- gfz10557.snx (gfz)
- jpl10557.snx (jpl)
- ncl1055g.snx (ncl)
--
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