[IGSREPORT-6493] Wk 1021 Preliminary IGS SINEX Combination
R.
R.
Wed Sep 29 08:17:53 PDT 1999
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IGS Electronic Report Wed Sep 29 8:17:53 PDT 1999 Message Number 6493
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Author: R. Ferland , D. Hutchison
Subject: Wk 1021 Preliminary IGS SINEX Combination
===================================================================
Combined AC solution for GPS week 1021 - 99/08/01 to 99/08/07
===================================================================
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
igs99P1021.snx Combined weekly solution.
igs99P1021.erp Daily Earth Rotation Parameters.
IGS99P31.snx Cumulative Combined solution.
igs99P1021.sum This file.
igs99P1021.itr Residuals between the AC and the ITRF97 for the RF stations.
igs99P1021.res Residuals between the AC and the Combined Weekly solution.
IGS99P31.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 = igs99P1021.snx
IGS = IGS99P31.snx
JPL = jpl1021g.snx
jpl = jpl10217.snx
JPL mit ncl are used to quality control the weekly combination.
emr gfz ngs sio excluded from the geocenter estimation (Sec. 5-4).
Starting with week 1021 the solutions are aligned to ITRF97.
A combined weekly and cumulative solutions were also aligned to
ITEF96 using 47 stations. The transformation parameters were determined
between the ITRF96 and ITRF97 aligned solutions. All the common stations
were used without the covarinace information. The results were compared
to the official IGS(ITRF96) to IGS(ITRF97) transformations (See: ITRF96/97
IGS product changes, Message 2432).
igs99P1021.snx(ITRF96) to igs99P1021.snx(ITRF97) (epoch 1999/08/04) :
---------------------------------------------------------------------
Parameter Estimated Official Difference
Rx (mas) 0.155 0.159 -0.004
Ry (mas) -0.265 -0.263 -0.002
Rz (mas) -0.056 -0.060 0.004
Tx (m) 0.0004 0.0003 0.0001
Ty (m) 0.0006 0.0005 0.0001
Tz (m) -0.0140 -0.0147 0.0007
Scl (ppb) 1.38 1.43 -0.06
IGS99P31.snx(ITRF96) to IGS99P31.snx(ITRF97) (epoch 1998/01/01) :
-------------------------------------------------------------------
Parameter Estimated Official Difference
Rx (mas) 0.129 0.138 -0.010
Ry (mas) -0.243 -0.239 -0.003
Rz (mas) -0.056 -0.065 0.009
Tx (m) 0.0012 0.0014 -0.0002
Ty (m) 0.0001 0.0003 -0.0003
Tz (m) -0.0118 -0.0117 -0.0001
Scl (ppb) 1.05 1.13 -0.08
dRx (mas/y) 0.007 0.013 -0.006
dRy (mas/y) -0.016 -0.015 -0.001
dRz (mas/y) 0.005 0.003 0.002
dTx (m/y) -0.0009 -0.0007 -0.0002
dTy (m/y) 0.0001 0.0001 0.0000
dTz (m/y) -0.0020 -0.0019 -0.0001
dScl (ppb/y) 0.18 0.19 -0.01
Note, the differences are all well within the transformation
parameters standard deviation (IGS Message 2432).
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 | 112 | 41 | 35.877 | 0.991 | 35.560 |
emr | 46 | 32 | 5.450 | 1.002 | 5.464 |
esa | 55 | 40 | 16.159 | 0.999 | 16.142 |
gfz | 69 | 41 | 19.137 | 0.997 | 19.078 |
jpl | 53 | 28 | 4.704 | 0.993 | 4.673 |
ngs | 75 | 49 | 33.853 | 0.997 | 33.762 |
sio | 125 | 45 | 2.144 | 0.997 | 2.137 |
JPL | 141 | 49 | 2.264 | 1.003 | 2.271 |
mit | 154 | 46 | 4.854 | 0.945 | 4.587 |
ncl | 85 | 48 | 2.690 | 0.997 | 2.683 |
---------------|-----|-----|---------------|---------------|---------------|
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 | 0.8 0.2 0.7 | 3.4 3.8 11.8 |
emr | -4.3 1.3 0.6 | 7.2 10.1 16.7 |
esa | -5.8 1.0 2.9 | 10.0 13.6 20.6 |
gfz | 1.4 -0.2 0.9 | 3.4 4.1 14.3 |
jpl | -0.2 0.2 0.4 | 3.6 5.2 12.4 |
ngs | 0.3 0.9 1.0 | 9.6 7.6 17.2 |
sio | -3.0 -0.1 0.2 | 4.6 6.4 12.9 |
JPL | 0.5 0.0 1.1 | 2.7 3.7 11.6 |
mit | 0.2 0.0 0.6 | 2.6 3.3 8.2 |
ncl | 0.3 0.1 0.4 | 2.5 3.2 5.6 |
---------------|---------------------------|---------------------------|
5-2-2) With respect to Weekly Combination:
============================================
Solution | Weighted Average (mm) | R.M.S. (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod | 0.9 0.4 -1.2 | 2.4 2.6 11.2 |
emr | -4.7 -0.1 0.7 | 6.5 8.5 11.0 |
esa | -5.7 1.3 3.9 | 10.6 16.7 17.3 |
gfz | 1.4 -0.3 -0.5 | 2.7 2.4 7.5 |
jpl | -0.7 -0.6 0.1 | 2.9 2.6 6.6 |
ngs | 0.2 0.8 -0.3 | 9.1 9.1 17.6 |
sio | -3.3 -0.2 -0.3 | 4.2 3.6 5.8 |
JPL | 0.7 0.0 1.4 | 1.5 1.0 7.5 |
mit | 0.4 0.0 1.7 | 1.5 1.2 6.5 |
ncl | 0.3 0.1 0.7 | 1.4 1.2 6.7 |
ITR | 0.1 0.1 -1.2 | 2.6 4.0 11.3 |
---------------|---------------------------|---------------------------|
5-2-3) With respect to Cumulative Combination:
================================================
Solution | Weighted Average (mm) | R.M.S. (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod | -0.4 1.1 -3.8 | 4.3 3.2 15.8 |
emr | -5.0 0.0 -1.5 | 7.7 9.2 15.5 |
esa | -5.7 1.1 2.3 | 11.5 17.6 19.4 |
gfz | 1.5 -0.3 -1.8 | 3.1 3.6 10.4 |
jpl | -0.7 -0.7 -1.5 | 4.3 4.2 11.0 |
ngs | 0.2 0.7 -2.3 | 9.3 10.1 19.7 |
sio | -4.1 0.1 -2.5 | 5.5 5.3 8.9 |
JPL | 0.1 0.4 -0.4 | 2.9 3.0 10.9 |
mit | -0.3 0.3 -0.2 | 3.5 3.7 9.4 |
ncl | 0.2 0.0 -0.3 | 3.0 2.8 8.8 |
igs | -0.6 0.4 -1.9 | 2.7 3.0 8.0 |
ITR | 0.5 0.2 -1.1 | 2.7 3.1 9.6 |
---------------|---------------------------|---------------------------|
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 | 0.008 0.004 -0.009 9.1 -1.6 10.5 2.76 |
emr | -0.034 0.030 -0.034 -5.0 -49.8 211.9 1.77 |
esa | 0.306 -0.297 -0.155 -18.2 19.3 4.2 0.52 |
gfz | 0.000 -0.004 -0.022 -0.1 0.1 -0.9 0.64 |
jpl | 0.052 -0.014 -0.033 1.5 -10.5 -12.8 1.80 |
ngs | -0.083 0.084 0.062 -13.2 -7.2 15.4 1.56 |
sio | -0.404 -0.096 0.332 1.3 -23.3 76.3 0.98 |
JPL | 0.002 -0.050 0.064 -0.0 0.3 -2.9 1.38 |
mit | -0.013 -0.027 -0.011 -0.2 -0.0 -2.5 1.04 |
ncl | -0.013 -0.002 0.006 -0.4 -0.6 -0.9 0.36 |
---------------|---------------------------------------------------------------|
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 | 0.061 0.064 0.074 1.6 1.6 1.6 0.25 |
emr | 0.069 0.071 0.082 1.9 1.8 1.8 0.29 |
esa | 0.064 0.063 0.071 1.6 1.6 1.6 0.26 |
gfz | 0.062 0.063 0.069 1.6 1.6 1.6 0.25 |
jpl | 0.078 0.074 0.085 2.0 2.0 2.0 0.31 |
ngs | 0.057 0.059 0.064 1.5 1.5 1.5 0.23 |
sio | 0.060 0.061 0.067 1.6 1.6 1.5 0.24 |
JPL | 0.057 0.059 0.064 1.5 1.5 1.5 0.23 |
mit | 0.060 0.060 0.068 1.6 1.6 1.5 0.24 |
ncl | 0.058 0.059 0.064 1.5 1.5 1.5 0.23 |
---------------|---------------------------------------------------------------|
5-4) Geocenter:
====================
| X Y Z | s X s Y s Z |
| (mm) (mm) (mm) | (mm) (mm) (mm) |
---------------|---------------------------|---------------------------|
igs | -0.4 -7.3 -9.1 | 6.2 6.1 8.0 |
---------------|---------------------------|---------------------------|
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 | --- 5.6 3.9 3.6 .5 -.4 |
emr | --- -14.7 -.6 76.9 -3.2 -38.0 |
esa | --- -4.7 2.0 .2 -38.8 6.8 |
gfz | --- 24.8 -.1 -.8 6.1 .5 |
jpl | --- -7.4 1.0 14.2 2.2 -1.7 |
ngs | --- -219.2 -17.7 -31.1 -.3 -47.8 |
sio | --- -24.8 4.2 -1.0 5.4 -1.1 |
JPL | --- --- --- --- --- --- |
mit | --- 1.2 -21.6 -.1 -12.0 .4 |
ncl | --- --- --- --- --- --- |
ITR | --- --- --- --- --- --- |
---------------|------------------------------------------------------------|
5-5-2) R.M.S. :
==================
Solution | UT LOD XPO XPOR YPO YPOR |
| us us .01mas .01ma/d .01mas .01ma/d |
---------------|------------------------------------------------------------|
cod | --- 12.1 5.2 17.8 4.7 16.0 |
emr | --- 22.1 8.6 79.6 7.5 49.0 |
esa | --- 23.6 9.2 23.5 40.6 60.5 |
gfz | --- 25.8 3.0 7.7 6.9 6.3 |
jpl | --- 18.9 7.7 25.3 6.7 19.2 |
ngs | --- 249.3 18.9 74.7 11.9 95.7 |
sio | --- 24.9 8.6 17.7 7.5 7.7 |
JPL | --- --- --- --- --- --- |
mit | --- 5.6 21.7 3.6 12.0 2.8 |
ncl | --- --- --- --- --- --- |
ITR | --- --- --- --- --- --- |
---------------|------------------------------------------------------------|
5-6) Outliers:
===================
Threshold set at 5 sigmas
Solution Solution | Station | N E U |
Minus |code id soln| (mm) (mm) (mm)|
-----------------------------------------|------------|-----------------------|
| | |
esa10217.snx JPL1021g.snx |MADR A ----| 38.0 -42.1 -8.2|
| | |
IGS99P30.snx jpl10217.snx |MADR A ----| 25.9 -32.9 -5.4|
| | |
IGS99P30.snx sio10217.snx |MADR A ----| 18.1 -24.2 -3.3|
IGS99P30.snx sio10217.snx |YAKA A ----| -19.5 9.5 -19.5|
| | |
IGS99P30.snx JPL1021g.snx |YAKA A ----| -20.6 7.4 -31.2|
| | |
IGS99P30.snx mit1021g.snx |YAKA A ----| -21.3 6.8 -28.5|
| | |
IGS99P30.snx ncl1021g.snx |YAKA A ----| -21.1 7.7 -22.3|
| | |
IGS99P30.snx igs99P1021.snx |MADR A ----| 21.4 -24.0 -2.5|
IGS99P30.snx igs99P1021.snx |YAKA A ----| -20.7 8.8 -32.6|
-----------------------------------------|------------|-----------------------|
5-7) Conflicts:
====================
IERS DOMES NO COD NRC ESA GFZ JPL NOA SIO
============= ====== ====== ====== ====== ====== ====== ======
40114M001 NRC1 A NRC2 A NRC1 A
40405S031 GOL2 A GOLD A GOL2 A GOL2 A GOL2 A GOLD B GOL2 A
42202M005 AREQ A AREQ B AREQ A AREQ A AREQ B AREQ A
50103M108 TID2 A TIDB A TIDB A TID2 A TID2 A TIDB A TID2 A
50107M004 YAR1 A YAR1 A YAR1 A YAR2 A YAR1 A YAR1 A YAR1 A
30302M007 HARK A HARK B HARK A HART B
13407S012 MADR A MAD2 A MADR A MAD2 A
22306M002 IISC B IISC A IISC A IISC B IISC A
MISSING IERS DOMES NOS AT GFZ:
-----------------------------
BISH A
MISSING IERS DOMES NOS AT SIO:
-----------------------------
GILB A KABR A
IERS DOMES NO JPL MIT NCL
============= ====== ====== ======
40405S031 GOL2 A GOLD A GOL2 A
GOLD A GOL2 A
30302M007 HARK A
HARK B
13407S012 MAD2 A MAD2 A
MADR A MADR A
12309M002 MDVO A
12309M001 MDVO A
40114M001 NRC1 A NRC2 A
NRC2 A NRC1 A
50103M108 TID2 A TIDB A TID2 A
TIDB A TID2 A TIDB A
MISSING IERS DOMES NOS AT JPL:
-----------------------------
INEG A
MISSING IERS DOMES NOS AT MIT:
-----------------------------
BISH A GILB A KABR A
--
[Mailed From: Remi Ferland <ferland at geod.nrcan.gc.ca>]
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