[IGSREPORT-20653] Wk 1677 IGS SINEX Combination
igs-rf at ign.fr
igs-rf at ign.fr
Thu Mar 15 06:27:36 PDT 2012
Authors: A. Duret, B. Garayt, P. Rebischung
================================================================================
Combination of AC solutions for GPS week 1677 - 12/02/26 to 12/03/03
================================================================================
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
igs12P1677.snx Combined weekly solution
igs12P1677.erp Daily Earth Rotation Parameters
igs12P1677.sum This file
igs12P1677.itr Residuals between AC solutions and IGS08 for the RF stations
igs12P1677.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 = mit16777.snx
mig = mit1677g.snx
ITR = IGS08.snx
igs = igs12P1677.snx (weekly combined solution)
IGS = IGS12P09.snx (cumulative solution)
The following solutions are not used in the combination but only for
comparison:
jpl mig ncl
Solutions with manual station deletion:
gfz CRAR
mit CCJ2 SCOA
sio ROAP CANT TSK2 CRAR SCOA
jpl CCJ2 0194
mig TONG CRAR KATZ MALL
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 | 254 | 100 | 55 | 8.536 |
emr | 84 | 58 | 50 | 1.877 |
esa | 134 | 55 | 47 | 1.554 |
gfz | 191 | 97 | 54 | 5.821 |
grg | 123 | 77 | 52 | 2.738 |
mit | 253 | 121 | 57 | 0.890 |
ngs | 223 | 107 | 57 | 16.889 |
sio | 274 | 118 | 53 | 0.801 |
jpl | 158 | 75 | 49 | ------ |
mig | 466 | 133 | 58 | ------ |
ncl | 220 | 120 | 58 | ------ |
igs | 410 | 133 | 58 | ------ |
---------------|-----|-----|-----|---------------|
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 100 | 0.7 -0.1 0.0 | 3.6 3.6 8.3 |
emr 58 | 0.4 0.1 0.2 | 4.0 4.1 9.6 |
esa 55 | 0.0 -0.2 0.0 | 4.5 3.2 8.4 |
gfz 97 | -0.3 -0.1 -0.1 | 4.3 3.3 9.1 |
grg 77 | 0.2 -0.3 0.2 | 3.6 3.6 8.9 |
mit 121 | 0.0 0.1 0.0 | 4.0 3.6 7.9 |
ngs 107 | 0.5 0.1 0.1 | 3.9 3.7 8.3 |
sio 118 | 0.2 -0.1 0.1 | 4.0 3.0 8.2 |
jpl 75 | 0.3 -0.2 0.2 | 4.5 3.0 10.2 |
mig 133 | 0.0 0.0 -0.1 | 3.8 3.3 7.7 |
ncl 120 | 0.1 -0.0 0.0 | 3.9 3.4 7.9 |
---------------|---------------------------|---------------------------|
5-2-2) With respect to the Weekly Combination:
=================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 248 | 0.1 0.0 -0.0 | 1.1 0.7 3.4 |
emr 84 | 0.3 -0.0 0.0 | 1.4 1.0 3.1 |
esa 130 | -0.8 -0.1 0.2 | 0.9 0.8 3.4 |
gfz 188 | -0.5 0.0 0.0 | 0.6 0.8 2.1 |
grg 119 | 0.0 -0.1 0.1 | 1.1 1.1 3.5 |
mit 247 | 0.2 0.1 -0.1 | 0.9 0.8 2.1 |
ngs 216 | 0.5 -0.0 0.0 | 1.5 2.2 3.9 |
sio 261 | -0.0 -0.0 0.1 | 1.0 0.8 2.9 |
jpl 132 | 0.1 0.1 -0.1 | 1.2 1.3 4.6 |
mig 405 | -0.0 -0.0 0.1 | 0.2 0.3 0.9 |
ncl 220 | 0.0 0.0 -0.0 | 0.6 0.5 0.9 |
ITR 133 | -0.1 0.0 -0.1 | 3.8 3.3 7.8 |
---------------|---------------------------|---------------------------|
5-2-3) With respect to the Cumulative Combination:
=====================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 227 | 0.1 -0.0 -0.1 | 2.4 2.2 5.9 |
emr 84 | 0.3 0.1 0.2 | 2.8 2.8 7.4 |
esa 123 | -0.9 -0.1 0.0 | 2.4 2.0 6.0 |
gfz 187 | -0.5 -0.0 -0.1 | 3.0 2.4 5.6 |
grg 119 | 0.2 -0.1 0.1 | 2.5 2.5 6.5 |
mit 246 | 0.2 0.1 0.2 | 2.6 2.6 6.4 |
ngs 212 | 0.6 -0.0 -0.0 | 2.8 3.0 6.0 |
sio 251 | -0.0 -0.0 0.3 | 2.9 2.5 6.5 |
jpl 129 | 0.2 -0.0 0.0 | 2.9 2.4 7.3 |
mig 380 | -0.3 2.7 0.2 | 23.0 58.5 6.7 |
ncl 218 | 0.1 -0.0 -0.0 | 2.6 2.2 5.2 |
igs 379 | -0.2 0.0 0.0 | 2.7 2.4 5.8 |
ITR 173 | -0.0 -0.1 0.0 | 2.3 2.7 4.7 |
---------------|---------------------------|---------------------------|
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 | -0.046 0.008 -0.004 -0.7 0.2 -1.8 0.26 |
emr | -0.009 0.016 -0.001 6.2 -3.9 13.4 0.38 |
esa | 0.119 -0.200 0.130 5.8 2.3 -20.4 0.03 |
gfz | -0.031 0.022 -0.017 -1.1 0.9 -1.2 0.16 |
grg | -0.036 0.045 -0.021 -1.9 0.8 -7.1 0.25 |
mit | -0.037 0.027 -0.055 5.0 1.2 2.4 0.17 |
ngs | -0.011 -0.030 0.035 5.2 -2.4 -0.1 0.35 |
sio | -0.031 -0.119 0.036 6.4 -1.0 14.1 0.16 |
jpl | -0.051 0.003 0.010 0.5 5.4 17.3 0.51 |
mig | -0.033 0.004 -0.053 -1.3 -0.0 -0.5 0.28 |
ncl | -0.020 0.002 0.029 -1.2 -0.6 -2.4 0.28 |
igs | 0.000 0.000 0.000 0.0 0.0 0.0 0.22 |
---------------|---------------------------------------------------------------|
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 | 0.031 0.034 0.035 0.8 0.8 0.8 0.13 |
emr | 0.034 0.037 0.041 0.9 0.9 0.9 0.14 |
esa | 0.035 0.038 0.041 0.9 0.9 0.9 0.15 |
gfz | 0.032 0.035 0.036 0.9 0.9 0.9 0.13 |
grg | 0.032 0.035 0.037 0.9 0.9 0.9 0.13 |
mit | 0.030 0.032 0.034 0.8 0.8 0.8 0.13 |
ngs | 0.031 0.033 0.035 0.8 0.8 0.8 0.13 |
sio | 0.030 0.032 0.034 0.8 0.8 0.8 0.12 |
jpl | 0.035 0.039 0.043 1.0 1.0 1.0 0.15 |
mig | 0.028 0.031 0.032 0.8 0.8 0.8 0.12 |
ncl | 0.029 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 0.11 |
---------------|---------------------------------------------------------------|
5-4) Geocenter:
====================
| X Y Z | s X s Y s Z |
| (mm) (mm) (mm) | (mm) (mm) (mm) |
---------------|---------------------------|---------------------------|
igs | 3.9 0.7 -1.9 | 0.4 0.4 0.5 |
---------------|---------------------------|---------------------------|
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 | --- 15.4 -0.8 -12.7 4.9 19.7 |
esa | --- 0.2 -2.0 9.9 -1.7 -23.5 |
gfz | --- 10.0 1.0 -3.3 0.2 -3.0 |
grg | --- --- 2.2 4.0 -1.7 3.2 |
mit | --- 1.9 0.5 -13.4 0.0 7.8 |
ngs | --- -0.1 -1.2 7.2 4.7 10.7 |
sio | --- 12.4 -0.9 15.2 2.0 -3.6 |
jpl | --- 14.9 1.8 14.4 -0.3 22.1 |
mig | --- 28.2 -2.0 16.9 -0.1 -2.9 |
ncl | --- --- --- --- --- --- |
BuA | --- -0.2 -5.5 14.9 5.1 16.6 |
---------------|------------------------------------------------------------|
5-5-2) STD:
==============
Solution | UT LOD XPO XPOR YPO YPOR |
| us us .01mas .01ma/d .01mas .01ma/d |
---------------|------------------------------------------------------------|
cod | --- --- --- --- --- --- |
emr | --- 7.5 2.0 16.8 2.3 14.3 |
esa | --- 6.7 1.2 5.9 1.5 7.6 |
gfz | --- 4.7 1.4 5.9 1.1 10.6 |
grg | --- --- 1.7 5.8 2.0 4.2 |
mit | --- 5.6 1.8 4.1 1.2 3.7 |
ngs | --- 0.3 3.1 7.7 4.4 12.2 |
sio | --- 7.0 1.4 2.9 1.5 5.4 |
jpl | --- 10.0 1.0 8.7 1.5 6.2 |
mig | --- 5.6 1.4 3.1 1.5 4.8 |
ncl | --- --- --- --- --- --- |
BuA | --- 10.1 8.2 7.9 6.1 7.6 |
---------------|------------------------------------------------------------|
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)|
-----------------------------------------|------------|-----------------------|
| | |
gfz16777.snx Combination: Iter. 1 |ULAB A 3| 8.1 -1.1 -2.4|
grg16777.snx Combination: Iter. 1 |NOVM A 1| 47.2 -2.6 39.4|
grg16777.snx Combination: Iter. 1 |POTS A 3| 7.3 2.8 0.1|
esa16777.snx Combination: Iter. 2 |FLIN A 4| 4.1 -1.8 -10.0|
esa16777.snx Combination: Iter. 2 |SCH2 A 3| 3.1 -1.6 -11.0|
esa16777.snx Combination: Iter. 2 |THTI A 2| 0.1 4.9 -1.2|
grg16777.snx Combination: Iter. 2 |HNPT A 3| -4.3 0.6 1.1|
grg16777.snx Combination: Iter. 2 |ALIC A 2| -0.0 1.3 -16.0|
ngs16777.snx Combination: Iter. 2 |TOW2 A 2| -1.9 -8.5 1.2|
| | |
mit1677g.snx Comp. to igs12P1677.snx |ULAB A 3| -0.3 3.0 -1.3|
| | |
igs12P1677.snx Stacking: Iter. 1 |ALRT A 1| 4.9 8.4 11.1|
igs12P1677.snx Stacking: Iter. 1 |CTWN A 2| 2.2 -1.2 54.1|
igs12P1677.snx Stacking: Iter. 1 |ELRO A 1| 10.7 17.2 50.8|
igs12P1677.snx Stacking: Iter. 1 |FLIN A 4| -11.3 0.5 -4.1|
igs12P1677.snx Stacking: Iter. 1 |METS A 2| -9.1 0.9 -5.1|
igs12P1677.snx Stacking: Iter. 1 |RESO A 1| -9.5 0.3 5.3|
igs12P1677.snx Stacking: Iter. 1 |SCH2 A 3| -10.7 -10.1 4.7|
igs12P1677.snx Stacking: Iter. 1 |TWTF A 2| 9.8 3.6 -0.6|
igs12P1677.snx Stacking: Iter. 1 |ZWE2 A 1| -4.5 10.8 6.6|
| | |
-----------------------------------------|------------|-----------------------|
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 |
----|---------|----------------------|----------------------|--------|
esa | AREQ A | JPS EGGDT | ASHTECH UZ-12 | igs |
gfz | BIS2 A | AOA BENCHMARK ACT | ASHTECH Z-XII3 | cors |
sio | DGAV A | JPS EGGDT | JAVAD TRE_G3TH DELTA | igs |
mit | ELRO A | TPS NET-G3A | LEICA RS500 | ucsd |
esa | HARV A | AOA SNR-8000 ACT | JAVAD TRE_G3TH DELTA | igs |
gfz | HARV A | AOA SNR-8000 ACT | JAVAD TRE_G3TH DELTA | igs |
ngs | HARV A | AOA SNR-8000 ACT | JAVAD TRE_G3TH DELTA | igs |
sio | HARV A | AOA SNR-8000 ACT | JAVAD TRE_G3TH DELTA | igs |
esa | MANA A | TRIMBLE 4000SSI | TRIMBLE NETR9 | igs |
sio | MANA A | TRIMBLE 4000SSI | TRIMBLE NETR9 | igs |
mit | NETT A | TRIMBLE NETRS | TRIMBLE 4000SSI | ucsd |
sio | OHI3 A | LEICA GRX1200GGPRO | LEICA GRX1200+GNSS | igs |
mit | SIO5 A | TPS NET-G3A | ASHTECH Z-XII3 | cors |
sio | SPT0 A | JPS E_GGD | JAVAD TRE_G3TH DELTA | igs |
cod | TABV A | JAVAD TRE_G3TH DELTA | JPS EGGDT | jpl |
sio | ZAMB A | ROGUE SNR-8000 | ASHTECH Z-XII3 | igs |
----|---------|----------------------|----------------------|--------|
6-2) Antennas:
===================
AC | Station | Used Antenna | Antenna from log | Source |
----|---------|----------------------|----------------------|--------|
grg | AREQ A | AOAD/M_T NONE | AOAD/M_T JPLA | igs |
mit | AREQ A | AOAD/M_T NONE | AOAD/M_T JPLA | igs |
sio | AREQ A | AOAD/M_T NONE | AOAD/M_T JPLA | igs |
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 | MCM4 A | AOAD/M_T NONE | AOAD/M_T JPLA | 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 |
cod | TABV A | TPSCR.G3 SCIS | ASH700936A_M SNOW | jpl |
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
CTWN A M
MCCJ A M
OBE3 A 14208M005
RECT A 33804M001
TIXG A 12360M001
UNB3 A 40146M002
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