[IGSREPORT-19771] Wk 1634 IGS SINEX Combination
igs-rf at ign.fr
igs-rf at ign.fr
Thu May 19 02:43:21 PDT 2011
Authors: B. Garayt, P. Rebischung
================================================================================
Combination of AC solutions for GPS week 1634 - 11/05/01 to 11/05/07
================================================================================
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
igs11P1634.snx Combined weekly solution
igs11P1634.erp Daily Earth Rotation Parameters
igs11P1634.sum This file
igs11P1634.itr Residuals between AC solutions and IGS08 for the RF stations
igs11P1634.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 = mit16347.snx
mig = mit1634g.snx
ITR = IGS08.snx
igs = igs11P1634.snx (weekly combined solution)
IGS = IGS11P18.snx (cumulative solution)
The following solutions are not used in the combination but only for
comparison:
jpl mig ncl
Solutions with manual station deletion:
grg NOVM
mit VBCA
sio FLIN OUSD
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 | 247 | 107 | 55 | 8.755 |
emr | 80 | 54 | 40 | 2.202 |
esa | 143 | 63 | 44 | 2.341 |
gfz | 193 | 105 | 56 | 6.074 |
grg | 134 | 87 | 55 | 4.183 |
mit | 253 | 123 | 58 | 0.918 |
ngs | 225 | 113 | 57 | 16.732 |
sio | 288 | 133 | 55 | 0.944 |
jpl | 119 | 63 | 50 | ------ |
mig | 464 | 146 | 59 | ------ |
ncl | 209 | 122 | 58 | ------ |
igs | 424 | 146 | 59 | ------ |
---------------|-----|-----|-----|---------------|
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 107 | -0.5 0.0 -0.3 | 2.4 2.5 7.7 |
emr 54 | -0.9 0.0 -0.1 | 2.2 2.3 6.2 |
esa 63 | -0.6 -0.1 0.0 | 3.3 2.5 8.4 |
gfz 105 | -0.6 0.0 0.0 | 2.5 2.3 7.3 |
grg 87 | -0.5 0.0 -0.1 | 3.2 2.7 6.9 |
mit 123 | -0.9 0.0 -0.0 | 2.4 2.7 6.8 |
ngs 113 | -0.9 0.1 0.2 | 3.0 2.7 7.3 |
sio 133 | -1.0 0.1 0.4 | 2.5 2.6 7.1 |
jpl 63 | -0.7 -0.0 -0.3 | 2.2 3.3 7.8 |
mig 146 | -1.1 0.1 -0.0 | 2.5 2.5 6.5 |
ncl 122 | -1.2 0.0 -0.1 | 3.8 4.5 7.0 |
---------------|---------------------------|---------------------------|
5-2-2) With respect to the Weekly Combination:
=================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 241 | 0.2 -0.0 -0.1 | 0.8 0.8 3.0 |
emr 80 | 0.2 -0.0 -0.1 | 1.7 1.0 3.9 |
esa 141 | 0.5 -0.0 -0.0 | 2.1 1.4 4.1 |
gfz 192 | 0.2 -0.0 -0.0 | 0.6 0.7 2.4 |
grg 129 | 0.6 -0.1 0.0 | 2.2 1.7 4.7 |
mit 248 | -0.0 0.0 -0.0 | 0.7 0.7 2.0 |
ngs 219 | 0.2 0.1 -0.0 | 1.5 1.5 3.9 |
sio 281 | -0.6 0.1 0.2 | 1.9 0.9 3.4 |
jpl 105 | 0.3 -0.0 -0.2 | 1.7 2.8 5.7 |
mig 414 | -0.4 0.0 -0.0 | 0.3 0.5 1.4 |
ncl 208 | -0.2 0.0 -0.0 | 2.9 3.4 2.8 |
ITR 146 | 0.6 -0.1 -0.1 | 2.4 2.5 6.1 |
---------------|---------------------------|---------------------------|
5-2-3) With respect to the Cumulative Combination:
=====================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 226 | -0.0 0.0 -0.3 | 1.9 1.8 6.3 |
emr 80 | -0.7 0.1 -0.1 | 2.2 1.7 5.4 |
esa 132 | 0.1 0.0 -0.1 | 3.1 2.0 7.0 |
gfz 187 | -0.3 0.0 -0.1 | 2.0 1.8 5.6 |
grg 129 | 0.2 0.0 0.0 | 3.3 2.2 6.7 |
mit 248 | -0.5 0.0 0.1 | 1.9 2.0 5.9 |
ngs 218 | -0.3 0.1 -0.0 | 2.4 1.9 6.5 |
sio 273 | -1.2 0.1 0.4 | 2.4 2.1 6.4 |
jpl 106 | -0.3 0.1 -0.1 | 2.5 3.3 6.8 |
mig 393 | -0.7 0.1 0.0 | 2.1 2.0 5.3 |
ncl 205 | -0.7 0.1 -0.1 | 3.7 3.7 6.1 |
igs 399 | -0.4 0.0 0.0 | 2.0 1.9 5.1 |
ITR 181 | 0.1 -0.1 0.0 | 1.9 2.2 3.6 |
---------------|---------------------------|---------------------------|
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 | -0.029 -0.017 -0.001 -1.0 0.4 -0.1 0.32 |
emr | 0.004 0.013 0.025 -1.1 3.0 11.5 0.55 |
esa | -0.022 0.014 0.066 0.9 -4.2 17.0 0.32 |
gfz | -0.014 0.039 0.012 -3.4 0.3 -1.0 0.40 |
grg | -0.010 0.023 -0.037 4.3 -4.0 25.5 0.29 |
mit | -0.011 0.003 -0.016 3.5 -6.5 14.4 0.40 |
ngs | -0.039 -0.015 0.016 5.6 -9.1 7.4 0.42 |
sio | 0.011 -0.019 -0.034 1.1 1.3 6.8 0.49 |
jpl | 0.023 -0.051 0.047 -1.1 -2.0 11.1 -0.63 |
mig | -0.012 0.007 -0.013 0.6 -0.7 1.5 0.35 |
ncl | 0.017 -0.029 0.011 -1.4 0.7 -0.6 0.41 |
igs | 0.000 0.000 0.000 0.0 0.0 0.0 0.40 |
---------------|---------------------------------------------------------------|
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 | 0.029 0.032 0.033 0.8 0.8 0.8 0.12 |
emr | 0.024 0.026 0.030 0.7 0.7 0.7 0.10 |
esa | 0.035 0.037 0.042 0.9 0.9 0.9 0.15 |
gfz | 0.026 0.028 0.029 0.7 0.7 0.7 0.11 |
grg | 0.025 0.027 0.029 0.7 0.7 0.7 0.11 |
mit | 0.026 0.028 0.029 0.7 0.7 0.7 0.11 |
ngs | 0.027 0.029 0.031 0.7 0.7 0.7 0.11 |
sio | 0.028 0.029 0.032 0.7 0.7 0.7 0.12 |
jpl | 0.031 0.032 0.038 0.8 0.8 0.8 0.13 |
mig | 0.025 0.027 0.028 0.7 0.7 0.7 0.10 |
ncl | 0.029 0.032 0.034 0.8 0.8 0.8 0.12 |
igs | 0.000 0.000 0.000 0.0 0.0 0.0 0.08 |
---------------|---------------------------------------------------------------|
5-4) Geocenter:
====================
| X Y Z | s X s Y s Z |
| (mm) (mm) (mm) | (mm) (mm) (mm) |
---------------|---------------------------|---------------------------|
igs | 2.4 -2.9 13.0 | 0.4 0.4 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 | --- -17.5 -0.8 6.6 3.2 2.2 |
esa | --- 2.8 -0.7 -5.3 1.0 24.3 |
gfz | --- -4.2 -0.6 10.8 -0.7 1.2 |
grg | --- --- -1.3 12.4 -2.7 -7.5 |
mit | --- 1.5 1.1 -9.8 -1.2 0.5 |
ngs | --- 0.5 -1.7 0.2 -1.8 0.1 |
sio | --- -7.2 -0.9 -3.8 3.8 -14.0 |
jpl | --- -3.5 -0.6 7.9 -1.0 5.8 |
mig | --- 19.2 -2.0 0.9 1.7 -15.3 |
ncl | --- --- --- --- --- --- |
BuA | --- -9.7 -2.5 9.7 -0.0 -5.6 |
---------------|------------------------------------------------------------|
5-5-2) STD:
==============
Solution | UT LOD XPO XPOR YPO YPOR |
| us us .01mas .01ma/d .01mas .01ma/d |
---------------|------------------------------------------------------------|
cod | --- --- --- --- --- --- |
emr | --- 4.3 2.1 17.2 2.3 6.5 |
esa | --- 4.5 1.6 6.2 1.6 8.8 |
gfz | --- 18.5 1.4 8.4 1.4 4.5 |
grg | --- --- 4.4 19.2 2.3 11.8 |
mit | --- 2.3 0.9 3.3 1.1 3.9 |
ngs | --- 7.0 3.3 11.2 3.9 13.1 |
sio | --- 4.7 1.3 6.9 1.5 6.8 |
jpl | --- 8.2 2.3 13.5 0.8 12.9 |
mig | --- 3.2 1.1 6.6 1.3 6.3 |
ncl | --- --- --- --- --- --- |
BuA | --- 15.7 4.8 4.9 3.8 10.1 |
---------------|------------------------------------------------------------|
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)|
-----------------------------------------|------------|-----------------------|
| | |
grg16347.snx Combination: Iter. 1 |POTS A 3| 9.8 3.6 0.6|
grg16347.snx Combination: Iter. 1 |WIND A 2| 7.2 -0.5 3.2|
grg16347.snx Combination: Iter. 1 |KOUC A 3| -6.3 -1.4 -3.3|
grg16347.snx Combination: Iter. 2 |GOPE A 5| -0.6 4.4 0.1|
| | |
jpl16347.snx Comp. to igs11P1634.snx |JOGJ A 1| 11.3 -12.2 24.9|
jpl16347.snx Comp. to igs11P1634.snx |NURK A 2| 21.5 -1.0 -2.0|
jpl16347.snx Comp. to igs11P1634.snx |OHI3 A 2| 5.0 1.5 23.8|
jpl16347.snx Comp. to igs11P1634.snx |PARC A 2| -6.5 3.5 -20.9|
ncl1634g.snx Comp. to igs11P1634.snx |NOVM A 1| 0.1 11.4 1.8|
| | |
igs11P1634.snx Stacking: Iter. 1 |BRFT A 4| -9.6 0.6 -4.6|
| | |
-----------------------------------------|------------|-----------------------|
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
igsp ftp://igscb.jpl.nasa.gov/pub/station/pendinglogs
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
6-1) Receivers:
====================
AC | Station | Used Receiver | Receiver from log | Source |
----|---------|----------------------|----------------------|--------|
mit | BRAZ A | NOV OEMV3 | TRIMBLE NETRS | igs |
cod | FRDN A | TPS NETG3 | AOA BENCHMARK ACT | igsp |
mit | KARR A | ASHTECH UZ-12 | TRIMBLE NETR8 | igs |
mit | MAC1 A | TRIMBLE NETR5 | LEICA GRX1200+GNSS | igs |
sio | MAC1 A | ASHTECH UZ-12 | LEICA GRX1200+GNSS | igs |
mit | MAD2 A | ASHTECH Z-XII3 | ASHTECH Z-XII3T | igs |
mit | MAJU A | TRIMBLE R7 | ASHTECH UZ-12 | argn |
mit | MTJO A | TRIMBLE NETRS | TRIMBLE NETR9 | argn |
mit | NETT A | TRIMBLE NETRS | TRIMBLE 4000SSI | ucsd |
esa | TASH A | JAVAD TRE_G3TH DELTA | AOA BENCHMARK ACT | igsp |
grg | TLSE A | TRIMBLE NETR5 | TRIMBLE NETR9 | igs |
esa | WTZR A | LEICA GRX1200GGPRO | LEICA GRX1200+GNSS | igs |
grg | WTZR A | LEICA GRX1200GGPRO | LEICA GRX1200+GNSS | igs |
----|---------|----------------------|----------------------|--------|
6-2) Antennas:
===================
AC | Station | Used Antenna | Antenna from log | Source |
----|---------|----------------------|----------------------|--------|
grg | AREQ A | AOAD/M_T NONE | AOAD/M_T JPLA | igs |
emr | CAS1 A | AOAD/M_T DOME | AOAD/M_T AUST | igs |
grg | CAS1 A | AOAD/M_T NONE | AOAD/M_T AUST | igs |
emr | CEDU A | AOAD/M_T DOME | AOAD/M_T AUST | igs |
grg | CEDU A | AOAD/M_T NONE | AOAD/M_T AUST | igs |
mit | COT1 A | ASH700936E UNKN | ASH700936E NONE | cors |
emr | DAV1 A | LEIAR25.R3 DOME | LEIAR25.R3 LEIT | igs |
grg | EPRT A | TRM29659.00 NONE | TRM29659.00 LEIS | igs |
grg | FAIR A | ASH701945G_M NONE | ASH701945G_M JPLA | igs |
cod | FRDN A | TPSCR.G3 NONE | AOAD/M_T NONE | igsp |
emr | HOFN A | TPSCR3_GGD DOME | TPSCR3_GGD CONE | 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 |
mit | MAC1 A | AOAD/M_T DOME | AOAD/M_T AUST | 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 | MCIL A | TRM29659.00 NONE | TRM29659.00 DOME | 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 | MTJO A | TRM29659.00 SCIS | TRM55971.00 NONE | argn |
grg | MTKA A | ASH701073.1 NONE | ASH701073.1 SNOW | igs |
mit | NETP A | TRM55971.00 NONE | TRM57971.00 NONE | cors |
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 |
emr | OHI2 A | TPSCR.G3 DOME | TPSCR.G3 TPSH | igs |
grg | ONSA A | AOAD/M_B NONE | AOAD/M_B OSOD | igs |
sio | REDU A | ASH701945C_M UNKN | ASH701945C_M NONE | igsp |
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 |
esa | TASH A | JAV_RINGANT_G3T NONE | AOAD/M_T NONE | igsp |
grg | THU3 A | ASH701073.1 NONE | ASH701073.1 SCIS | igs |
emr | TOW2 A | AOAD/M_T DOME | AOAD/M_T AUST | igs |
grg | TOW2 A | AOAD/M_T NONE | AOAD/M_T AUST | igs |
emr | VESL A | TRM29659.00 DOME | TRM29659.00 TCWD | 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 |
----|---------|-------------------------|-------------------------|--------|
----|---------|-------------------------|-------------------------|--------|
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