[IGSREPORT-8468] Wk 1122 IGS SINEX Combination
David Hutchison
hutch at geod.nrcan.gc.ca
Thu Jul 26 11:57:24 PDT 2001
******************************************************************************
IGS Electronic Report 26 Jul 11:57:27 PDT 2001 Message Number 8468
******************************************************************************
Author: R. Ferland , D. Hutchison
===================================================================
Combined AC solution for GPS week 1122 - 01/07/08 to 01/07/14
===================================================================
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
igs01P1122.snx Combined weekly solution.
igs01P1122.erp Daily Earth Rotation Parameters.
igs00p02.erp Daily Earth Rotation Parameters since GPS week 1013.
IGS01P28.snx Cumulative Combined solution.
igs01P1122.sum This file.
igs01P1122.itr Residuals between the AC and the IGS97 for the RF stations.
igs01P1122.res Residuals between the AC and the Combined Weekly solution.
IGS01P28.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
IGS97 stations at the current epoch.
ftp://igscb.jpl.nasa.gov/igscb/station/coord/IGS00P04_RS51.SNX.Z with
AREQ excluded.
3-4) The AC are compared to IGS97, 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 IGS97 of the current
epoch using a 7-parameters transformation. The singular cumulative
combined solution is aligned to the IGS97 of the reference epoch
using a 14-parameters transformation and the 50 ITRF station positions
and velocities (AREQ excluded). The IGS97 is a realization of ITRF97.
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 = IGS00P04_RS51.SNX without AREQ
(renamed locally as ITRF_IGS00P04_RS50noAREQ.snx)
igs = igs01P1122.snx
IGS = IGS01P28.snx
BuA = IERS Bulletin A
emr gfz ngs sio excluded from the geocenter estimation (Sec. 5-4).
Solutions with manual station deletion:
After unconstraining:
emr NRC1 NRC2
4-1) Starting with GPS week 1065, the solutions are aligned to the
IGS00P04_RS51.SNX realization of ITRF97. Starting with GPS week 1120,
AREQ is excluded from the reference frame (ITR above).
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 | 120 | 40 | 33.638 | 1.000 | 33.624 |
emr | 45 | 27 | 3.086 | 1.021 | 3.150 |
esa | 52 | 37 | 10.484 | 0.981 | 10.282 |
gfz | 73 | 36 | 13.203 | 1.000 | 13.200 |
jpl | 62 | 28 | 4.525 | 0.999 | 4.521 |
ngs | 72 | 43 | 20.905 | 1.000 | 20.895 |
igs | 121 | 45 | 1.290 | 1.014 | 1.308 |
---------------|-----|-----|---------------|---------------|---------------|
5-2) Solution Residuals weighted Average & STD :
=====================================================
5-2-1) With respect to the IGS97 stations:
=============================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 38 | 0.8 0.2 0.1 | 3.1 3.7 11.9 |
emr 25 | 1.1 -0.1 -0.4 | 3.5 5.6 10.8 |
esa 34 | -0.4 0.0 -0.7 | 5.6 3.9 11.2 |
gfz 35 | 0.1 -0.2 -1.1 | 3.0 4.0 10.6 |
jpl 27 | 1.1 0.2 -0.7 | 3.1 4.9 11.2 |
ngs 42 | -1.9 0.9 0.4 | 5.3 5.4 11.5 |
---------------|---------------------------|---------------------------|
5-2-2) With respect to the Weekly Combination:
=================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 107 | 1.2 0.0 0.7 | 1.6 2.3 6.7 |
emr 40 | 0.0 0.4 0.6 | 2.2 4.2 4.4 |
esa 51 | -0.6 -0.3 1.1 | 3.8 4.4 6.7 |
gfz 63 | -0.5 -0.6 0.9 | 1.9 1.9 4.3 |
jpl 53 | 0.1 0.7 0.1 | 1.4 1.5 4.3 |
ngs 65 | -1.8 0.0 1.1 | 3.8 4.2 8.0 |
ITR 44 | -0.4 -0.2 0.0 | 3.2 4.1 10.6 |
---------------|---------------------------|---------------------------|
5-2-3) With respect to the Cumulative Combination:
=====================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 108 | 1.1 0.9 0.2 | 3.3 3.9 11.7 |
emr 41 | 0.9 0.0 -1.3 | 2.8 6.0 8.8 |
esa 52 | -0.4 0.6 0.8 | 5.4 4.8 8.0 |
gfz 63 | -0.1 -0.1 -0.8 | 2.6 3.4 8.1 |
jpl 53 | 1.1 0.7 -1.5 | 2.4 3.3 10.0 |
ngs 67 | -1.2 0.6 -0.4 | 5.0 5.4 9.6 |
igs 121 | 0.2 0.7 -0.9 | 2.6 2.7 8.0 |
ITR 50 | 0.0 0.0 -0.2 | 1.5 2.2 6.3 |
---------------|---------------------------|---------------------------|
5-3) 7-Parameters Transformation: AC ----> IGS00P04_RS51.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 | 0.099 -0.137 0.059 11.1 9.4 -9.4 2.74 |
emr | -0.017 -0.027 -0.024 1.3 10.4 11.2 2.07 |
esa | 0.118 0.042 -0.014 -7.7 9.4 8.5 1.16 |
gfz | -0.022 0.007 -0.125 -2.4 0.8 -4.9 2.63 |
jpl | -0.061 -0.056 -0.066 -2.4 7.2 -35.8 2.43 |
ngs | 0.111 0.164 -0.298 1.6 2.8 12.8 2.05 |
---------------|---------------------------------------------------------------|
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 | 0.065 0.065 0.073 1.7 1.7 1.7 0.26 |
emr | 0.081 0.079 0.090 2.1 2.1 2.1 0.32 |
esa | 0.071 0.071 0.078 1.8 1.8 1.8 0.28 |
gfz | 0.066 0.066 0.077 1.7 1.7 1.7 0.27 |
jpl | 0.076 0.074 0.086 2.0 1.9 1.9 0.30 |
ngs | 0.060 0.061 0.069 1.6 1.6 1.6 0.25 |
---------------|---------------------------------------------------------------|
5-4) Geocenter:
====================
| X Y Z | s X s Y s Z |
| (mm) (mm) (mm) | (mm) (mm) (mm) |
---------------|---------------------------|---------------------------|
igs | 2.6 7.9 -25.9 | 2.5 2.5 7.9 |
---------------|---------------------------|---------------------------|
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 | --- 15.6 6.8 2.4 -8.9 .6 |
emr | --- 23.4 5.2 5.4 5.2 -23.6 |
esa | --- 30.7 -1.5 2.2 -26.5 2.8 |
gfz | --- 8.4 9.6 -.4 11.4 1.6 |
jpl | --- -80.3 1.1 6.1 1.9 -9.0 |
ngs | --- 18.5 -30.7 -81.1 11.9 -95.2 |
ITR | --- --- --- --- --- --- |
BuA | --- 12.7 5.4 3.4 36.2 2.0 |
---------------|------------------------------------------------------------|
5-5-2) STD :
===============
Solution | UT LOD XPO XPOR YPO YPOR |
| us us .01mas .01ma/d .01mas .01ma/d |
---------------|------------------------------------------------------------|
cod | --- 10.0 3.2 6.6 2.3 7.6 |
emr | --- 19.1 6.7 20.9 4.5 16.3 |
esa | --- 11.4 7.5 21.4 4.9 20.1 |
gfz | --- 9.6 4.1 16.1 1.7 6.5 |
jpl | --- 46.0 6.1 21.1 2.6 29.2 |
ngs | --- 22.1 11.7 59.2 3.8 49.0 |
ITR | --- --- --- --- --- --- |
BuA | --- 13.9 10.2 19.4 8.6 15.0 |
---------------|------------------------------------------------------------|
5-6) Outliers:
===================
Thresholds set at 5 sigmas and 50 mm.
Solution Solution | Station | N E U |
Minus |code id soln| (mm) (mm) (mm)|
-----------------------------------------|------------|-----------------------|
| | |
ITRF_IGS00P04_RS50no ngs11227.snx |GRAZ A ----| -6.2 7.7 -81.6|
| | |
cod11227.snx esa11227.snx |OHIG A ----| 5.7 -0.2 58.9|
| | |
cod11227.snx jpl11227.snx |INEG A ----| 4.2 3.1 50.6|
| | |
emr11227.snx esa11227.snx |SANT A ----| 16.0 -1.5 51.8|
| | |
cod11227.snx esa11227.snx |RIOG A ----| 11.3 -5.0 51.7|
| | |
igs01P1121.snx cod11227.snx |AREQ A ----| 32.6 33.2 -5.8|
| | |
igs01P1121.snx emr11227.snx |AREQ A ----| 31.1 26.7 -19.8|
| | |
igs01P1121.snx gfz11227.snx |AREQ A ----| 26.8 27.6 -13.2|
| | |
igs01P1121.snx jpl11227.snx |AREQ A ----| 30.2 30.5 -13.3|
| | |
IGS01P27.snx gfz11227.snx |COCO A ----| 5.7 -28.8 2.5|
| | |
IGS01P27.snx jpl11227.snx |COCO A ----| 5.8 -22.6 -1.5|
| | |
IGS01P27.snx igs01P1122.snx |AREQ A ----| 33.0 28.0 -9.3|
IGS01P27.snx igs01P1122.snx |BAKO A ----| 0.6 3.6 -51.2|
IGS01P27.snx igs01P1122.snx |COCO A ----| 4.9 -26.2 -2.4|
-----------------------------------------|------------|-----------------------|
5-7) Conflicts:
===========================
5-7-1) Station Name Conflicts:
=============================
IERS DOMES NO cod emr esa gfz jpl ngs IGS igs
============= ====== ====== ====== ====== ====== ====== ====== ======
42005M001 GALA A GALA B GALA A GALA A GALA B GALA A GALA A
40114M001 NRC1 A NRC1 A NRC1 A NRC1 A NRC1 A NRC1 A
NRC2 A
40405S031 GOLD A GOL2 A GOLD A GOL2 A GOLD A GOLD A
50103M108 TIDB A TIDB A TID2 A TIDB A TIDB A TID2 A TIDB A TIDB A
30314M002 SUTH A SUTH B SUTH A SUTH A SUTH A SUTH A SUTH A
42202M005 AREQ A AREQ A AREQ A AREQ A AREQ B
22003M001 PIMO B PIMO A PIMO A PIMO A
50107M004 YAR1 A YAR1 A YAR1 A YAR1 A YAR1 A YAR1 A
YAR2 A
5-7-2) Station Antenna Conflicts:
================================
_______________________
|Enforcing these aliases|
|_______________________|
TIDB A: TID2 A
GOLD A: GOL2 A
PIMO A: PIMO B
GALA A: GALA B
SUTH A: SUTH B
YAR1 A: YAR2 A
ABBREVIATIONS:
-------------
L1: L1 Offset
L2: L2 Offset
ECC: Eccentricity
-N: NORTH (Latitude)
-E: EAST (Longitude)
-U: UP (Vertical)
Compare to file IGS.SNX (IGS).
Antenna Conflicts in file cod11227.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 MDVO A .0780 .0000 -.0030 .0744 -.0031 -.0013 .1456 .0000 .0000
IGS MDVO A .0960 -.0016 .0009 .0944 .0016 .0041 .1456 .0000 .0000
Antenna Conflicts in file ngs11227.snx (ngs).
------- --------- -- ----
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.)
=== ==== == ==== ==== ==== ==== ==== ==== ==== ==== ====
ngs BAKO A .0757 .0000 .0000 .0745 .0000 .0000 1.6160 .0000 .0000
IGS BAKO A .0780 .0000 -.0030 .0744 -.0031 -.0013 1.6160 .0000 .0000
ngs GRAZ A .0000 .0000 .0000 .0000 .0000 .0000 1.9640 .0000 .0000*
IGS GRAZ A .1100 .0000 .0000 .1280 .0000 .0000 1.9640 .0000 .0000
* Antenna listed as "NULL".
ngs WUHN A .1081 .0000 .0000 .1256 .0000 .0000 2.3200 .0000 .0000
IGS WUHN A .1100 .0000 .0000 .1280 .0000 .0000 2.3200 .0000 .0000
The following files have no antenna conflicts:
- emr11227.snx (emr)
- esa11227.snx (esa)
- gfz11227.snx (gfz)
- jpl11227.snx (jpl)
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