[IGSREPORT-8898] Wk 1144 IGS SINEX Combination
David Hutchison
hutch at geod.nrcan.gc.ca
Thu Dec 27 17:42:48 PST 2001
******************************************************************************
IGS Electronic Report 27 Dec 17:42:51 PST 2001 Message Number 8898
******************************************************************************
Author: R. Ferland, D. Hutchison
===================================================================
Combined AC solution for GPS week 1144 - 01/12/09 to 01/12/15
===================================================================
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
igs01P1144.snx Combined weekly solution.
igs01P1144.erp Daily Earth Rotation Parameters.
igs00p02.erp Daily Earth Rotation Parameters since GPS week 1013.
IGS01P50.snx Cumulative Combined solution.
igs01P1144.sum This file.
igs01P1144.itr Residuals between the AC and the IGS00 for the RF stations.
igs01P1144.res Residuals between the AC and the Combined Weekly solution.
IGS01P50.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
IGS00 stations at the current epoch.
ftp://igscb.jpl.nasa.gov/igscb/station/coord/IGS01P37_RS54.SNX.Z
3-4) The AC are compared to IGS00, 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 IGS00 of the current
epoch using a 7-parameters transformation. The singular cumulative
combined solution is aligned to the IGS00 of the reference epoch
using a 14-parameters transformation and the 54 ITRF station positions
and velocities. The IGS00 is a realization of ITRF2000.
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:
===========
ITR = IGS01P37_RS54.SNX
igs = igs01P1144.snx
IGS = IGS01P50.snx
BuA = IERS Bulletin A
gfz excluded from the geocenter estimation (Sec. 5-4).
Solutions with manual station deletion:
From the original solution:
ITR AREQ
After unconstraining:
emr NRC1 NRC2
4-1) Starting with GPS week 1143, the solutions are aligned to the
IGS01P37_RS54.SNX realization of ITRF2000.
4-2) Starting with GPS week 1078, UT1-UTC from IERS Bulletin A
is included in the erp files.
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 | 122 | 45 | 25.919 | 0.996 | 25.806 |
emr | 41 | 30 | 3.845 | 0.997 | 3.835 |
esa | 57 | 32 | 10.645 | 0.996 | 10.601 |
gfz | 81 | 38 | 7.770 | 1.067 | 8.292 |
jpl | 64 | 27 | 4.608 | 0.996 | 4.590 |
sio | 131 | 47 | 2.067 | 1.096 | 2.265 |
igs | 146 | 50 | 1.216 | 1.110 | 1.350 |
---------------|-----|-----|---------------|---------------|---------------|
5-2) Solution Residuals weighted Average & STD :
=====================================================
5-2-1) With respect to the IGS00 stations:
=============================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 44 | -0.7 0.1 -1.2 | 3.1 3.6 12.2 |
emr 29 | -3.9 -0.5 0.9 | 4.1 4.7 8.7 |
esa 30 | -8.4 -0.4 3.1 | 6.7 4.9 14.2 |
gfz 36 | -2.0 0.0 0.2 | 2.5 3.8 8.2 |
jpl 26 | -2.8 -0.2 1.0 | 2.5 2.8 9.1 |
sio 46 | -1.1 -0.1 0.8 | 2.6 3.3 10.1 |
---------------|---------------------------|---------------------------|
5-2-2) With respect to the Weekly Combination:
=================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 119 | 0.5 1.2 -2.1 | 2.2 3.3 10.0 |
emr 40 | -2.2 -0.7 1.7 | 2.6 3.4 7.1 |
esa 56 | -7.3 0.2 3.8 | 5.2 4.9 9.8 |
gfz 74 | -0.6 0.7 0.6 | 1.8 1.7 5.9 |
jpl 57 | -1.0 -0.1 1.7 | 1.6 1.3 6.7 |
sio 123 | 0.4 -0.2 1.3 | 1.6 2.9 6.9 |
ITR 49 | 1.3 0.0 -0.2 | 2.4 2.9 7.1 |
---------------|---------------------------|---------------------------|
5-2-3) With respect to the Cumulative Combination:
=====================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 120 | -1.0 0.5 -2.4 | 3.0 3.6 11.1 |
emr 41 | -4.1 -0.8 2.1 | 3.8 4.8 9.3 |
esa 57 | -8.8 -0.7 3.3 | 6.0 5.3 14.3 |
gfz 76 | -2.4 0.0 0.4 | 3.5 3.5 10.0 |
jpl 59 | -3.1 -0.2 2.3 | 3.3 3.0 9.5 |
sio 125 | -1.5 -0.5 1.7 | 2.9 3.6 11.0 |
igs 146 | -1.7 -0.5 -0.1 | 2.2 2.3 7.6 |
ITR 54 | -0.1 -0.1 0.0 | 0.4 0.4 0.9 |
---------------|---------------------------|---------------------------|
5-3) 7-Parameters Transformation: AC ----> IGS01P37_RS54.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 | 0.023 -0.014 0.013 15.0 11.4 2.8 1.68 |
emr | 0.015 -0.005 0.026 -2.5 -5.9 4.8 0.63 |
esa | 0.053 0.005 -0.014 -7.7 42.2 14.6 0.31 |
gfz | -0.017 -0.014 0.047 -0.5 0.3 -1.7 1.52 |
jpl | 0.000 -0.010 0.026 -2.9 17.5 -5.9 0.44 |
sio | 0.193 -0.125 -0.002 10.7 14.2 87.5 1.48 |
---------------|---------------------------------------------------------------|
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 | 0.059 0.060 0.067 1.5 1.5 1.5 0.24 |
emr | 0.075 0.071 0.084 1.9 1.9 1.9 0.30 |
esa | 0.073 0.079 0.085 2.0 2.0 2.0 0.31 |
gfz | 0.066 0.065 0.076 1.7 1.7 1.7 0.27 |
jpl | 0.078 0.074 0.090 2.0 2.0 2.0 0.31 |
sio | 0.058 0.058 0.065 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 | 3.8 13.8 11.3 | 4.2 4.3 6.6 |
---------------|---------------------------|---------------------------|
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 | --- 1.4 -1.7 --- -2.7 --- |
emr | --- 3.9 -6.1 1.0 4.7 -20.3 |
esa | --- -8.6 -22.1 -5.9 -2.2 .8 |
gfz | --- -13.2 2.8 1.4 -.1 .2 |
jpl | --- 21.0 4.5 1.3 4.5 7.0 |
sio | --- 10.4 11.7 3.1 1.4 4.3 |
ITR | --- --- --- --- --- --- |
BuA | --- 3.2 2.2 -.4 28.5 5.0 |
---------------|------------------------------------------------------------|
5-5-2) STD :
===============
Solution | UT LOD XPO XPOR YPO YPOR |
| us us .01mas .01ma/d .01mas .01ma/d |
---------------|------------------------------------------------------------|
cod | --- 8.0 3.9 --- 4.3 --- |
emr | --- 11.4 5.2 19.1 2.9 25.6 |
esa | --- 13.5 11.4 33.4 3.6 11.4 |
gfz | --- 8.6 1.8 8.9 2.7 6.3 |
jpl | --- 20.7 3.2 14.0 2.5 16.1 |
sio | --- 7.1 5.9 10.3 7.3 5.4 |
ITR | --- --- --- --- --- --- |
BuA | --- 23.6 6.7 11.1 9.2 8.7 |
---------------|------------------------------------------------------------|
5-6) Outliers:
===================
Thresholds set at 5 sigmas and 50 mm.
Solution Solution | Station | N E U |
Minus |code id soln| (mm) (mm) (mm)|
-----------------------------------------|------------|-----------------------|
| | |
esa11447.snx gfz11447.snx |SANT A ----| -5.1 -4.5 -51.3|
| | |
igs01P1143.snx esa11447.snx |KELY A ----| -3.3 3.8 85.4|
| | |
IGS01P49.snx cod11447.snx |HOFN A ----| 5.8 -4.5 -64.4|
IGS01P49.snx cod11447.snx |SCH2 A ----| -6.3 7.1 54.8|
| | |
IGS01P49.snx emr11447.snx |GOUG A ----| 4.6 2.0 51.4|
| | |
IGS01P49.snx sio11447.snx |HERS A ----| -2.2 13.3 18.5|
IGS01P49.snx sio11447.snx |HOFN A ----| 6.6 -3.4 -53.5|
IGS01P49.snx sio11447.snx |WHIT A ----| 5.0 -2.2 -34.4|
| | |
IGS01P49.snx igs01P1144.snx |COCO A ----| 0.8 -16.0 1.5|
IGS01P49.snx igs01P1144.snx |KSTU A ----| -18.7 -2.1 24.2|
-----------------------------------------|------------|-----------------------|
5-7) Conflicts:
===========================
5-7-1) Station Name Conflicts:
=============================
IERS DOMES NO cod emr esa gfz jpl sio IGS igs
============= ====== ====== ====== ====== ====== ====== ====== ======
42005M001 GALA A GALA A GALA B GALA A GALA A GALA A GALA A GALA A
22306M002 IISC A IISC A IISC B IISC A IISC A IISC A IISC A IISC A
13407S012 MADR A MADR A MAD2 A MAD2 A MADR A MADR A
MADR A
40114M001 NRC1 A NRC1 A NRC1 A NRC1 A NRC1 A NRC1 A NRC1 A
NRC2 A
40405S031 GOLD A GOLD A GOLD A GOLD A GOLD A
GOL2 A
30314M002 SUTH A SUTH A SUTH B SUTH A SUTH A SUTH A SUTH A
MISSING IERS DOMES NOS AT gfz:
-----------------------------
BISH A
MISSING IERS DOMES NOS AT sio:
-----------------------------
CAVA A SFEL A VOLT A
MISSING IERS DOMES NOS AT IGS:
-----------------------------
ELAT A
5-7-2) Station Antenna Conflicts:
================================
_______________________
|Enforcing these aliases|
|_______________________|
NRC1 A: NRC2 A
GALA A: GALA B
SUTH A: SUTH B
IISC A: IISC B
MADR A: MAD2 A
GOLD A: GOL2 A
ABBREVIATIONS:
-------------
L1: L1 Offset
L2: L2 Offset
ECC: Eccentricity
-N: NORTH (Latitude)
-E: EAST (Longitude)
-U: UP (Vertical)
Comments: Recent antenna changes at CAGL, CHAT and NOUM not registered at
-------- COD and SIO.
Compare to file IGS.SNX (IGS).
Antenna Conflicts in file cod11447.snx (cod).
------- --------- -- ----
STN L1-U L1-N L1-E L2-U L2-N L2-E ECC-U ECC-N ECC-E
AGY CODE PT (M.) (M.) (M.) (M.) (M.) (M.) (M.) (M.) (M.)
=== ==== == ==== ==== ==== ==== ==== ==== ==== ==== ====
cod CAGL A .1100 .0000 .0000 .1280 .0000 .0000 .0450 .0000 .0000
IGS CAGL A .1100 .0000 .0000 .1280 .0000 .0000 .0000 .0000 .0000
Antenna Conflicts in file sio11447.snx (sio).
------- --------- -- ----
STN L1-U L1-N L1-E L2-U L2-N L2-E ECC-U ECC-N ECC-E
AGY CODE PT (M.) (M.) (M.) (M.) (M.) (M.) (M.) (M.) (M.)
=== ==== == ==== ==== ==== ==== ==== ==== ==== ==== ====
sio CAGL A .1100 .0000 .0000 .1280 .0000 .0000 .0450 .0000 .0000
IGS CAGL A .1100 .0000 .0000 .1280 .0000 .0000 .0000 .0000 .0000
sio CHAT A .1100 .0000 .0000 .1280 .0000 .0000 .0031 .0000 .0000
IGS CHAT A .1100 .0000 .0000 .1280 .0000 .0000 .0062 .0000 .0000
sio NOUM A .1100 .0000 .0000 .1280 .0000 .0000 .0000 .0000 .0000
IGS NOUM A .0714 .0003 .0005 .0682 -.0004 .0001 .0000 .0000 .0000
The following files have no antenna conflicts:
- emr11447.snx (emr)
- esa11447.snx (esa)
- gfz11447.snx (gfz)
- jpl11447.snx (jpl)
--
David Hutchison
Geodetic Survey of Canada
Ottawa, Ontario, Canada
Internet: hutch at geod.emr.ca
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