[IGSREPORT-20530] Wk 1671 IGS SINEX Combination
igs-rf at ign.fr
igs-rf at ign.fr
Thu Feb 2 06:43:51 PST 2012
Authors: A. Duret, B. Garayt, P. Rebischung
================================================================================
Combination of AC solutions for GPS week 1671 - 12/01/15 to 12/01/21
================================================================================
1) Contacts:
============
e-mail: igs-rf at ign.fr
Tel: 0033143988197 (Bruno Garayt)
Fax: 0033143988450
2) Products:
============
Products are available at:
CDDIS: ftp://cddis.gsfc.nasa.gov/gps/products
SOPAC: ftp://garner.ucsd.edu/pub/products
ENSG: ftp://igs.ensg.eu/pub/igs/products
IGN: ftp://igs.ign.fr/pub/igs/products
igs12P1671.snx Combined weekly solution
igs12P1671.erp Daily Earth Rotation Parameters
igs12P1671.sum This file
igs12P1671.itr Residuals between AC solutions and IGS08 for the RF stations
igs12P1671.res Residuals between AC solutions and combined weekly solution
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 name 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 are inverted by adding
minimal constraints.
3-4) The weekly AC solutions are combined. The 7-parameter singularity is
avoided by using internal constraints. Iterations are performed until no
residuals exceed 2 cm or 5 sigma.
3-5) The combined solution is compared to IGS08 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-parameter
transformation estimated using the IGS08 core network.
3-6) The AC solutions NOT used in the combination are compared to the combined
solution in order to identify and remove outliers.
4) Remarks:
===========
mit = mit16717.snx
mig = mit1671g.snx
ITR = IGS08.snx
igs = igs12P1671.snx (weekly combined solution)
IGS = IGS12P03.snx (cumulative solution)
The following solutions are not used in the combination but only for
comparison:
jpl mig ncl
Solutions with manual station deletion:
cod CTWN
gfz CRAR OBE3
mit KIRI WSMN
sio CANT HARB KIRI ROAP STK2 STR2 CRAR
jpl 0194
mig 0194 WMSN CRAR KATZ KABR ELAT TELA VARS TRDS
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.
Solution |# sta| #RF |#core| Final VF |
---------------|-----|-----|-----|---------------|
cod | 251 | 98 | 53 | 7.675 |
emr | 87 | 58 | 49 | 1.815 |
esa | 129 | 55 | 42 | 1.611 |
gfz | 193 | 100 | 53 | 5.912 |
grg | 122 | 76 | 49 | 3.075 |
mit | 256 | 119 | 55 | 1.041 |
ngs | 217 | 104 | 54 | 15.236 |
sio | 278 | 124 | 54 | 0.962 |
jpl | 162 | 77 | 47 | ------ |
mig | 466 | 134 | 55 | ------ |
ncl | 216 | 116 | 55 | ------ |
igs | 398 | 134 | 55 | ------ |
---------------|-----|-----|-----|---------------|
5-2) Solution Residuals weighted Average & STD:
====================================================
5-2-1) With respect to the IGS08 stations:
=============================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 98 | -0.3 -0.1 0.2 | 3.9 3.1 9.1 |
emr 58 | -0.6 -0.1 0.7 | 4.5 4.1 11.3 |
esa 55 | 0.1 -0.0 0.3 | 4.1 3.1 9.4 |
gfz 100 | -0.3 -0.1 0.3 | 4.0 3.3 10.4 |
grg 76 | -0.5 -0.3 -0.0 | 4.2 3.5 10.8 |
mit 119 | -0.3 -0.0 0.3 | 3.9 3.4 9.2 |
ngs 104 | -0.2 -0.2 0.3 | 3.7 3.7 8.8 |
sio 124 | -0.2 -0.3 0.5 | 4.1 3.3 9.6 |
jpl 77 | -0.4 -0.0 -0.8 | 4.5 4.7 12.0 |
mig 134 | -0.5 -0.1 0.2 | 3.7 3.1 9.2 |
ncl 116 | -0.6 -0.2 0.2 | 3.8 3.4 9.2 |
---------------|---------------------------|---------------------------|
5-2-2) With respect to the Weekly Combination:
=================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 246 | -0.3 -0.0 -0.0 | 0.9 0.7 3.3 |
emr 86 | 0.1 -0.1 0.1 | 0.9 0.8 3.2 |
esa 126 | -0.0 0.1 -0.0 | 1.1 1.0 3.4 |
gfz 188 | -0.1 0.0 0.0 | 0.6 0.7 2.0 |
grg 118 | 0.2 -0.0 -0.1 | 1.4 1.2 3.9 |
mit 246 | 0.2 0.1 0.0 | 0.7 1.0 2.3 |
ngs 213 | 0.4 -0.1 -0.0 | 1.0 1.6 2.6 |
sio 259 | 0.0 -0.1 0.1 | 1.2 1.0 2.9 |
jpl 131 | -0.1 0.1 -0.1 | 1.3 3.2 5.4 |
mig 390 | -0.2 -0.0 0.0 | 0.3 0.4 0.8 |
ncl 216 | -0.1 0.0 0.0 | 0.7 1.1 1.0 |
ITR 134 | 0.3 0.1 -0.1 | 3.6 3.0 9.1 |
---------------|---------------------------|---------------------------|
5-2-3) With respect to the Cumulative Combination:
=====================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 224 | -0.8 -0.0 0.1 | 2.8 2.3 6.8 |
emr 86 | -0.4 0.1 0.5 | 3.5 3.0 8.0 |
esa 117 | -0.3 0.3 0.2 | 3.0 2.4 6.6 |
gfz 185 | -0.5 -0.0 0.2 | 2.8 2.4 7.1 |
grg 118 | -0.4 -0.2 0.2 | 3.0 2.7 8.2 |
mit 245 | -0.3 0.1 0.3 | 2.8 2.7 6.7 |
ngs 209 | -0.0 -0.1 0.1 | 2.7 3.2 6.8 |
sio 250 | -0.3 -0.1 0.5 | 3.1 2.5 6.9 |
jpl 131 | -1.1 0.1 0.2 | 3.4 4.7 12.5 |
mig 370 | -0.3 -0.2 2.7 | 3.3 4.8 90.8 |
ncl 211 | -0.7 -0.0 0.2 | 2.8 2.6 6.6 |
igs 367 | -0.5 0.1 0.1 | 2.6 2.5 6.4 |
ITR 174 | -0.0 -0.1 0.0 | 2.3 2.6 4.4 |
---------------|---------------------------|---------------------------|
5-3) 7-Parameters Transformation: AC ----> IGS08
=====================================================
These transformation parameters are estimated using the IGS08 core stations
available in the AC solutions.
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 | -0.037 -0.016 0.008 -1.3 -0.4 -1.7 0.20 |
emr | 0.010 0.013 -0.000 4.2 -0.7 22.8 0.48 |
esa | 0.098 -0.187 0.120 8.1 3.7 3.6 0.15 |
gfz | -0.054 0.017 -0.010 -2.0 0.6 -1.8 0.26 |
grg | -0.027 0.032 -0.036 8.2 -7.5 -3.3 0.21 |
mit | -0.031 0.012 -0.042 9.6 -1.1 -1.9 0.29 |
ngs | 0.016 -0.056 0.042 6.5 1.1 -3.2 0.32 |
sio | 0.042 -0.076 0.036 6.8 3.6 19.3 0.21 |
jpl | -0.048 0.109 0.000 4.1 2.2 10.2 0.40 |
mig | -0.041 0.028 -0.088 -1.2 0.8 0.3 0.31 |
ncl | -0.034 0.017 0.021 -2.4 -1.4 -2.7 0.26 |
igs | 0.000 0.000 0.000 0.0 0.0 0.0 0.26 |
---------------|---------------------------------------------------------------|
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 0.035 0.036 0.9 0.9 0.9 0.13 |
emr | 0.038 0.042 0.044 1.0 1.0 1.0 0.16 |
esa | 0.037 0.041 0.042 1.0 1.0 1.0 0.16 |
gfz | 0.034 0.038 0.038 0.9 0.9 0.9 0.14 |
grg | 0.034 0.037 0.039 0.9 0.9 0.9 0.14 |
mit | 0.033 0.036 0.037 0.9 0.9 0.9 0.14 |
ngs | 0.032 0.035 0.036 0.9 0.9 0.9 0.13 |
sio | 0.033 0.035 0.037 0.9 0.9 0.9 0.14 |
jpl | 0.041 0.044 0.046 1.1 1.1 1.1 0.17 |
mig | 0.032 0.035 0.035 0.8 0.8 0.8 0.13 |
ncl | 0.031 0.034 0.035 0.8 0.8 0.8 0.13 |
igs | 0.000 0.000 0.000 0.0 0.0 0.0 0.10 |
---------------|---------------------------------------------------------------|
5-4) Geocenter:
====================
| X Y Z | s X s Y s Z |
| (mm) (mm) (mm) | (mm) (mm) (mm) |
---------------|---------------------------|---------------------------|
igs | 6.3 0.7 4.4 | 0.4 0.3 0.6 |
---------------|---------------------------|---------------------------|
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 | --- --- --- --- --- --- |
emr | --- -0.7 -0.4 -16.8 1.7 5.1 |
esa | --- -2.6 -2.3 12.6 0.2 -8.2 |
gfz | --- 3.7 2.0 10.4 -1.9 -1.9 |
grg | --- --- 1.9 4.6 -2.8 1.3 |
mit | --- 9.4 1.2 -17.5 -0.4 4.7 |
ngs | --- -0.1 -0.5 -3.5 6.8 3.4 |
sio | --- -5.2 -0.3 -14.8 0.2 15.0 |
jpl | --- -2.1 0.1 -13.3 -0.8 -3.2 |
mig | --- 21.0 -1.9 -12.6 -1.4 8.5 |
ncl | --- --- --- --- --- --- |
BuA | --- 2.7 -2.2 -1.1 0.5 12.0 |
---------------|------------------------------------------------------------|
5-5-2) STD:
==============
Solution | UT LOD XPO XPOR YPO YPOR |
| us us .01mas .01ma/d .01mas .01ma/d |
---------------|------------------------------------------------------------|
cod | --- --- --- --- --- --- |
emr | --- 11.4 3.2 8.4 1.1 10.4 |
esa | --- 9.9 1.3 2.6 1.2 9.9 |
gfz | --- 10.4 1.0 11.2 2.6 7.8 |
grg | --- --- 2.0 7.7 1.6 6.9 |
mit | --- 8.5 1.1 6.6 1.6 6.2 |
ngs | --- 0.4 6.2 6.6 4.5 17.0 |
sio | --- 14.1 2.8 7.5 2.2 6.4 |
jpl | --- 12.3 1.5 8.9 1.5 12.1 |
mig | --- 13.7 2.7 6.9 2.2 5.6 |
ncl | --- --- --- --- --- --- |
BuA | --- 11.8 7.1 16.2 7.9 12.3 |
---------------|------------------------------------------------------------|
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 2 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 2 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 8 sigma.
Solution Stage of rejection | Station | N E U |
|code id soln| (mm) (mm) (mm)|
-----------------------------------------|------------|-----------------------|
| | |
emr16717.snx Combination: Iter. 1 |OUS2 A 6| -5.1 6.4 32.3|
gfz16717.snx Combination: Iter. 1 |OUS2 A 6| 1.2 -2.8 -17.5|
gfz16717.snx Combination: Iter. 1 |TAH1 A 1| 2.4 -4.1 24.2|
grg16717.snx Combination: Iter. 1 |NOVM A 1| 43.0 -1.5 31.8|
grg16717.snx Combination: Iter. 1 |POTS A 3| 8.1 2.5 -2.8|
mit16717.snx Combination: Iter. 1 |OUS2 A 6| 2.7 -3.9 -17.6|
sio16717.snx Combination: Iter. 1 |OUS2 A 6| 2.3 -3.6 -18.7|
sio16717.snx Combination: Iter. 1 |NOVM A 1| -9.6 0.0 -1.0|
esa16717.snx Combination: Iter. 2 |FLIN A 4| 0.8 -1.9 -12.9|
gfz16717.snx Combination: Iter. 2 |ULAB A 3| 8.8 -1.6 -3.7|
grg16717.snx Combination: Iter. 2 |ALIC A 2| -0.0 -0.3 -14.2|
grg16717.snx Combination: Iter. 2 |TOW2 A 2| -1.1 1.0 -14.6|
esa16717.snx Combination: Iter. 3 |HOB2 A 2| -4.1 0.6 -4.1|
| | |
jpl16717.snx Comp. to igs12P1671.snx |NURK A 2| 20.3 -0.2 -3.4|
jpl16717.snx Comp. to igs12P1671.snx |ULAB A 3| 18.8 0.3 3.2|
mit1671g.snx Comp. to igs12P1671.snx |NOVM A 1| -0.6 5.6 3.8|
| | |
igs12P1671.snx Stacking: Iter. 1 |ALRT A 1| 6.5 9.6 13.5|
igs12P1671.snx Stacking: Iter. 1 |ARTU A 1| -1.3 1.3 -16.3|
igs12P1671.snx Stacking: Iter. 1 |CHUR A 5| 9.4 1.5 -3.4|
igs12P1671.snx Stacking: Iter. 1 |FAIR A 7| 1.4 -2.0 -23.9|
igs12P1671.snx Stacking: Iter. 1 |MAG0 A 7| -12.1 -10.7 4.7|
igs12P1671.snx Stacking: Iter. 1 |METS A 2| -10.1 1.4 -13.5|
igs12P1671.snx Stacking: Iter. 1 |SCH2 A 3| -9.7 -8.1 11.6|
igs12P1671.snx Stacking: Iter. 1 |TWTF A 2| 8.7 0.9 0.6|
igs12P1671.snx Stacking: Iter. 1 |TXES A 1| -4.4 9.4 -16.0|
igs12P1671.snx Stacking: Iter. 1 |VALD A 1| 12.3 -4.6 9.3|
igs12P1671.snx Stacking: Iter. 1 |WHIT A 2| 9.4 -1.5 -16.1|
igs12P1671.snx Stacking: Iter. 1 |YELL A 4| 0.4 -6.9 0.2|
| | |
-----------------------------------------|------------|-----------------------|
6) Check of metadata in AC solutions:
=====================================
Starting with week 1585, receivers, antennas and eccentricities reported in
AC solutions are checked versus station logs. Station logs are gathered
from the following sources:
igs ftp://igscb.jpl.nasa.gov/pub/station/log
igsf ftp://igscb.jpl.nasa.gov/pub/station/oldlog
epn ftp://epncb.oma.be/pub/station/log
rgp ftp://rgpdata.ign.fr/pub/logsheet
cors ftp://www.ngs.noaa.gov/cors/station_log
argn ftp://ftp.ga.gov.au/geodesy-outgoing/gnss/logs
nrcan ftp://rtopsdata.geod.nrcan.gc.ca/pub/gps/stations_log
sirgas ftp://ftp.sirgas.org/pub/gps/DGF/station/log
rbmc ftp://geoftp.ibge.gov.br/RBMC/dados/log
unavco ftp://data-out.unavco.org/pub/logs
ucsd ftp://garner.ucsd.edu/pub/docs/site_logs
ign ftp://igs.ign.fr/pub/igs/igscb/station/log
6-1) Receivers:
====================
AC | Station | Used Receiver | Receiver from log | Source |
----|---------|----------------------|----------------------|--------|
gfz | BIS2 A | AOA BENCHMARK ACT | ASHTECH Z-XII3 | cors |
mit | ELRO A | TPS NET-G3A | LEICA RS500 | ucsd |
mit | NETT A | TRIMBLE NETRS | TRIMBLE 4000SSI | ucsd |
mit | SIO5 A | TPS NET-G3A | ASHTECH Z-XII3 | cors |
cod | TABV A | JAVAD TRE_G3TH DELTA | JPS EGGDT | jpl |
----|---------|----------------------|----------------------|--------|
6-2) Antennas:
===================
AC | Station | Used Antenna | Antenna from log | Source |
----|---------|----------------------|----------------------|--------|
grg | ARTU A | ASH700936D_M NONE | ASH700936D_M DOME | igs |
gfz | BIS2 A | AOAD/M_T NONE | ASH700829.3 SNOW | cors |
grg | CAS1 A | AOAD/M_T NONE | AOAD/M_T AUST | igs |
grg | CEDU A | AOAD/M_T NONE | AOAD/M_T AUST | igs |
grg | CRO1 A | ASH701945G_M NONE | ASH701945G_M JPLA | igs |
grg | FAIR A | ASH701945G_M NONE | ASH701945G_M JPLA | igs |
grg | KIR0 A | AOAD/M_T NONE | AOAD/M_T OSOD | igs |
grg | KOUC A | TRM57971.00 NONE | TRM57971.00 TZGD | igs |
grg | LHAZ A | ASH701941.B NONE | ASH701941.B SNOW | igs |
grg | MAR6 A | AOAD/M_T NONE | AOAD/M_T OSOD | igs |
grg | MAW1 A | AOAD/M_T NONE | AOAD/M_T AUST | igs |
grg | MDO1 A | AOAD/M_T NONE | AOAD/M_T JPLA | igs |
mit | NETT A | TRM55971.00 NONE | TRM29659.00 SCIS | ucsd |
grg | NRMD A | TRM57971.00 NONE | TRM57971.00 TZGD | igs |
grg | NYAL A | AOAD/M_B NONE | AOAD/M_B DOME | igs |
grg | ONSA A | AOAD/M_B NONE | AOAD/M_B OSOD | igs |
grg | SANT A | AOAD/M_T NONE | AOAD/M_T JPLA | igs |
grg | SPT0 A | AOAD/M_T NONE | AOAD/M_T OSOD | igs |
grg | SYOG A | AOAD/M_T NONE | AOAD/M_T DOME | igs |
grg | THU3 A | ASH701073.1 NONE | ASH701073.1 SCIS | igs |
grg | VIS0 A | AOAD/M_T NONE | AOAD/M_T OSOD | igs |
grg | WSRT A | AOAD/M_T NONE | AOAD/M_T DUTD | igs |
----|---------|----------------------|----------------------|--------|
6-3) Eccentricities:
=========================
AC | Station | Used Eccentricity | Eccentricity from log | Source |
----|---------|-------------------------|-------------------------|--------|
----|---------|-------------------------|-------------------------|--------|
6-4) No station logs found for:
====================================
CRAR A 66001M004
MCCJ A M
UNB3 A 40146M002
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