[IGSREPORT-18322] Wk 1570 IGS SINEX Combination
igs-rf at ign.fr
igs-rf at ign.fr
Wed Feb 24 07:30:13 PST 2010
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IGS Electronic Report 24 Feb 07:30:32 PST 2010 Message Number 18322
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Authors: B. Garayt, P. Rebischung
===============================================================
Combined AC solution for GPS week 1570 - 10/02/07 to 10/02/13
===============================================================
1) Contacts:
============
e-mail: igs-rf at ign.fr
Tel: 0033143988197 (Bruno Garayt)
Fax: 0033143988450
2) Products:
============
All products are available at:
CDDIS: ftp://cddis.gsfc.nasa.gov/gps/products
SOPAC: ftp://garner.ucsd.edu/pub/products
IGN: ftp://igs.ensg.eu/pub/igs/products
ftp://igs.ign.fr/pub/igs/products
igs10P1570.snx Combined weekly solution
igs10P1570.erp Daily Earth Rotation Parameters
igs10P1570.sum This file
igs10P1570.itr Residuals between AC solutions and IGS05 for the RF stations
igs10P1570.res Residuals between AC solutions and combined weekly solution
IGS10P06.snx Cumulative combined solution
IGS10P06.res Residuals between AC solutions and cumulative solution
igs00p03.erp Daily Earth Rotation Parameters since GPS week 860
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) Constrained AC solutions are unconstrained according to the information
given in their SOLUTION/APRIORI blocks and then minimally constrained.
AC solutions given in the form of a normal matrix (esa) are inverted by
adding minimal constraints.
3-4) The weekly AC solutions are combined. The 7-parameters singularity is
avoided by using internal constraints. Iterations are performed until no
residuals exceed 5 cm or 5 sigma.
3-5) The combined solution is compared to IGS05 propagated at current week
(datum). Some outliers may be removed from the datum. Finally, the
combined solution is aligned to the datum using a 7-parameters
transformation.
3-6) The AC solutions NOT used in the combination are compared to the combined
solution in order to identify and remove outliers.
3-7) The weekly combined solution is added to the cumulative solution.
Iterations are performed until no residuals exceed 3 cm or 3 sigma in the
weekly solution.
3-8) The updated cumulative solution is compared to IGS05 (datum). Some outliers
may be removed from the datum. Finally, the cumulative solution is aligned
to the datum using a 14-parameters transformation.
4) Remarks:
===========
mit = mit15707.snx
mig = mit1570g.snx
ITR = IGS05.snx
igs = igs10P1570.snx
IGS = IGS10P06.snx
grg, mig, ncl are not used in the combination.
They are only used for comparison.
Solutions with manual station deletion:
4-1) Starting with GPS week 1400, the solutions are aligned to the
IGS05.snx realization of ITRF2005.
4-2) Starting with GPS week 1078, UT1-UTC from IERS Bulletin A
is included in the erp files.
4-3) Starting with GPS week 1412, the accumulated ERP file has been
changed from "igs00p02.erp" to "igs00p03.erp". The main changes
are:
1) Correction of the pole position from IGb00 to IGS05 using the
transformation in:
http://igscb.jpl.nasa.gov/mail/igsmail/2006/msg00178.html
2) Marginal ERP's in GPS week 1161 were replaced by reprocessed
values.
5) Results:
============
5-1) AC (Variance Factor)^0.5 estimates:
=============================================
At each iteration, the variance factor for solution s is estimated by :
VF = (vs'*Ps*vs)/fs with fs = nobss - tr(As*Q*As'*Ps)
vs : residuals of solution s
Ps : weight matrix of solution s
nobss : number of observations of solution s
As : design matrix of solution s
Q : total covariance matrix
This variance factor is used to rescale the covariance matrix of solution s
for the next iteration.
Another scale factor is computed for each solution s, by comparing it to
the official cumulative solution of previous week (IGS) :
SF = (vs'*Ps*vs)/(3*nstas) with vs : residuals of the comparison
Ps : weight matrix of solution s
nstas : number of common stations
Solution |# sta| #RF | Final VF | SF |
---------------|-----|-----|---------------|---------------|
cod | 241 | 65 | 6.847 | 35.093 |
emr | 81 | 43 | 2.199 | 7.964 |
esa | 133 | 43 | 2.715 | 6.758 |
gfz | 197 | 66 | 4.536 | 21.990 |
jpl | 130 | 46 | 5.312 | 11.653 |
mit | 250 | 71 | 0.701 | 3.645 |
ngs | 217 | 70 | 17.204 | 53.884 |
sio | 262 | 68 | 0.917 | 3.605 |
grg | 107 | 43 | ------ | 12.480 |
mig | 415 | 72 | ------ | 3.099 |
ncl | 223 | 71 | ------ | 2.636 |
igs | 370 | 72 | ------ | ------ |
---------------|-----|-----|---------------|---------------|
5-2) Solution Residuals weighted Average & STD:
====================================================
5-2-1) With respect to the IGS05 stations:
=============================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 65 | -0.8 -0.1 0.6 | 3.5 3.2 9.3 |
emr 43 | 0.4 0.1 0.3 | 3.8 3.9 10.1 |
esa 43 | -0.2 -0.0 0.4 | 4.0 3.3 10.2 |
gfz 66 | -0.6 -0.0 0.2 | 3.4 3.4 9.6 |
jpl 46 | -0.2 -0.1 -0.9 | 4.0 4.2 9.8 |
mit 71 | -0.5 0.2 0.7 | 3.3 3.3 9.2 |
ngs 70 | 0.1 -0.0 0.2 | 3.1 3.2 9.4 |
sio 68 | -0.3 -0.0 0.7 | 4.2 3.5 10.4 |
grg 43 | -0.4 0.1 0.1 | 4.8 3.5 8.8 |
mig 72 | -0.5 0.0 0.4 | 3.4 3.3 9.4 |
ncl 71 | -0.4 0.0 0.4 | 3.4 3.2 9.2 |
---------------|---------------------------|---------------------------|
5-2-2) With respect to the Weekly Combination:
=================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 229 | -0.3 -0.1 0.1 | 0.8 0.7 2.7 |
emr 81 | 0.7 -0.0 -0.2 | 1.2 0.9 3.9 |
esa 130 | 0.3 -0.1 -0.1 | 2.8 1.5 4.5 |
gfz 197 | 0.0 0.0 -0.0 | 0.6 0.6 2.4 |
jpl 129 | 0.6 0.1 0.0 | 1.5 2.5 6.0 |
mit 227 | 0.0 0.1 -0.1 | 0.5 0.5 1.6 |
ngs 208 | 0.2 0.1 0.1 | 1.5 2.1 3.2 |
sio 258 | 0.1 -0.0 -0.0 | 1.4 0.9 2.9 |
grg 104 | -0.8 -0.1 -0.0 | 3.7 2.8 4.9 |
mig 370 | 0.1 0.0 -0.0 | 0.3 0.4 0.8 |
ncl 223 | 0.2 0.0 0.0 | 0.5 0.7 1.3 |
ITR 72 | 0.5 -0.2 -0.4 | 3.4 3.4 9.4 |
---------------|---------------------------|---------------------------|
5-2-3) With respect to the Cumulative Combination:
=====================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 203 | -1.2 -0.4 0.6 | 2.6 2.9 7.6 |
emr 80 | -0.1 -0.2 0.1 | 2.8 2.9 7.9 |
esa 118 | -0.7 -0.1 0.3 | 3.3 2.4 7.6 |
gfz 192 | -0.7 -0.2 0.2 | 2.7 2.8 7.6 |
jpl 124 | -0.7 0.1 -0.2 | 3.7 4.4 8.8 |
mit 221 | -0.9 -0.2 0.7 | 2.4 2.7 6.3 |
ngs 199 | -0.6 -0.1 0.2 | 2.5 3.5 7.4 |
sio 243 | -0.6 -0.3 0.6 | 3.3 2.7 7.0 |
grg 103 | -1.4 -0.2 0.3 | 4.0 3.2 8.1 |
mig 318 | -1.1 0.0 -0.2 | 2.8 3.0 7.1 |
ncl 220 | -0.8 -0.3 0.4 | 2.5 2.8 6.7 |
igs 318 | -1.1 -0.0 -0.1 | 2.8 2.9 7.0 |
ITR 116 | -0.8 -0.1 -0.1 | 2.9 3.1 11.7 |
---------------|---------------------------|---------------------------|
5-3) 7-Parameters Transformation: AC ----> IGS05.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 0.004 -0.028 -0.1 1.4 0.3 -0.03 |
emr | 0.047 -0.013 0.027 3.3 0.3 10.2 0.48 |
esa | 0.090 -0.072 0.003 9.6 6.4 4.7 0.28 |
gfz | 0.020 -0.005 -0.013 0.7 1.5 1.0 0.03 |
jpl | 0.008 -0.039 -0.072 7.5 -0.4 17.1 0.49 |
mit | 0.016 0.006 -0.035 9.7 -2.7 -5.0 0.21 |
ngs | -0.007 -0.185 -0.015 12.2 -0.2 -6.2 0.36 |
sio | -0.075 -0.129 -0.010 7.3 -3.0 -4.5 0.54 |
grg | 0.024 0.043 -0.024 6.3 14.1 12.8 0.91 |
mig | 0.019 0.009 -0.001 0.2 1.7 1.3 0.26 |
ncl | 0.003 0.051 0.035 -0.0 0.3 1.5 0.24 |
igs | 0.000 0.000 0.000 0.0 0.0 0.0 0.28 |
---------------|---------------------------------------------------------------|
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 | 0.032 0.033 0.036 0.9 0.8 0.8 0.13 |
emr | 0.040 0.043 0.048 1.1 1.1 1.1 0.17 |
esa | 0.039 0.042 0.047 1.1 1.1 1.1 0.17 |
gfz | 0.032 0.033 0.035 0.8 0.8 0.8 0.13 |
jpl | 0.040 0.040 0.045 1.1 1.0 1.0 0.16 |
mit | 0.030 0.031 0.033 0.8 0.8 0.8 0.12 |
ngs | 0.031 0.032 0.033 0.8 0.8 0.8 0.12 |
sio | 0.034 0.035 0.038 0.9 0.9 0.9 0.14 |
grg | 0.037 0.039 0.045 1.0 1.0 1.0 0.16 |
mig | 0.030 0.031 0.033 0.8 0.8 0.8 0.12 |
ncl | 0.030 0.031 0.033 0.8 0.8 0.8 0.12 |
igs | 0.000 0.000 0.000 0.0 0.0 0.0 0.20 |
---------------|---------------------------------------------------------------|
5-4) Geocenter:
====================
| X Y Z | s X s Y s Z |
| (mm) (mm) (mm) | (mm) (mm) (mm) |
---------------|---------------------------|---------------------------|
igs | 9.7 -1.0 -4.0 | 1.9 1.6 4.1 |
---------------|---------------------------|---------------------------|
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 | --- --- --- --- --- --- |
emr | --- 5.7 1.2 20.3 -1.5 3.4 |
esa | --- 4.6 -4.0 19.0 -3.1 -1.0 |
gfz | --- 12.6 -3.0 7.9 0.8 -16.0 |
jpl | --- 36.4 1.7 17.3 -4.0 13.1 |
mit | --- -4.5 1.8 -11.5 1.2 7.4 |
ngs | --- 12.7 4.2 5.9 -3.8 -0.5 |
sio | --- -4.1 1.9 -5.1 0.0 -2.9 |
grg | --- 16.6 -11.3 40.9 -2.2 -7.0 |
mig | --- -3.2 2.0 -0.5 -2.2 -0.5 |
ncl | --- --- --- --- --- --- |
BuA | --- 9.3 -1.5 14.2 3.3 3.5 |
---------------|------------------------------------------------------------|
5-5-2) STD:
==============
Solution | UT LOD XPO XPOR YPO YPOR |
| us us .01mas .01ma/d .01mas .01ma/d |
---------------|------------------------------------------------------------|
cod | --- --- --- --- --- --- |
emr | --- 6.1 3.5 10.6 1.3 5.4 |
esa | --- 4.9 1.8 5.5 1.4 10.1 |
gfz | --- 3.7 2.1 7.7 1.9 10.6 |
jpl | --- 18.9 1.4 17.5 1.6 5.4 |
mit | --- 1.0 0.7 2.1 1.1 5.2 |
ngs | --- 6.7 4.6 9.9 4.0 13.5 |
sio | --- 1.8 1.0 4.4 0.9 5.1 |
grg | --- 21.3 5.9 16.0 3.2 12.3 |
mig | --- 1.6 1.0 4.4 1.0 5.6 |
ncl | --- --- --- --- --- --- |
BuA | --- 13.8 6.5 8.2 3.1 10.4 |
---------------|------------------------------------------------------------|
5-6) Satellite Antenna Offset Residuals weighted Average & STD:
====================================================================
No Satellite phase center ...
5-7) Outliers:
===================
Outliers may be rejected at different stages of the processing:
- During the combination (stage 3-4)), outliers may be removed from the
weekly AC solutions. Thresholds are set to 5 cm and 5 sigma.
- During stage 3-6), outliers may be removed from the AC solutions NOT
included in the combination. Thresholds are set to 5 cm and 5 sigma.
- During the stacking of the weekly combined solution on the cumulative
solution (stage 3-7)), outliers may be removed from the weekly
solution. Thresholds are set to 3 cm and 3 sigma.
Solution Stage of rejection | Station | N E U |
|code id soln| (mm) (mm) (mm)|
-----------------------------------------|------------|-----------------------|
| | |
sio15707.snx Combination: Iter. 1 |OHI3 A 1| -0.9 -1.0 18.7|
sio15707.snx Combination: Iter. 1 |MANA A 2| -0.2 13.8 1.4|
| | |
grg15707.snx Comp. to igs10P1570.snx |ASPA A 3| -20.5 -67.2 25.1|
| | |
igs10P1570.snx Stacking: Iter. 1 |EIL1 A 1| -0.3 15.9 38.5|
igs10P1570.snx Stacking: Iter. 1 |KR0G A 1| 5.2 -11.5 -30.2|
| | |
-----------------------------------------|------------|-----------------------|
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