[IGSREPORT-8609] Wk 1129 IGS SINEX Combination
David Hutchison
hutch at geod.nrcan.gc.ca
Thu Sep 13 18:28:05 PDT 2001
******************************************************************************
IGS Electronic Report 13 Sep 18:28:07 PDT 2001 Message Number 8609
******************************************************************************
Author: R. Ferland , D. Hutchison
===================================================================
Combined AC solution for GPS week 1129 - 01/08/26 to 01/09/01
===================================================================
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
igs01P1129.snx Combined weekly solution.
igs01P1129.erp Daily Earth Rotation Parameters.
igs00p02.erp Daily Earth Rotation Parameters since GPS week 1013.
IGS01P35.snx Cumulative Combined solution.
igs01P1129.sum This file.
igs01P1129.itr Residuals between the AC and the IGS97 for the RF stations.
igs01P1129.res Residuals between the AC and the Combined Weekly solution.
IGS01P35.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
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 51 ITRF station positions
and velocities. 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
igs = igs01P1129.snx
IGS = IGS01P35.snx
BuA = IERS Bulletin A
mit are used to quality control the weekly combination.
emr gfz ngs sio excluded from the geocenter estimation (Sec. 5-4).
Solutions with manual station deletion:
From the original solution:
ITR AREQ
After unconstraining:
emr NRC1 NRC2
New stations in the cumulative solution IGS01P35.snx
MAUI A ----
4-1) Starting with GPS week 1065, the solutions are aligned to the
IGS00P04_RS51.SNX realization of ITRF97.
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 | 121 | 40 | 29.243 | 0.999 | 29.219 |
emr | 49 | 32 | 3.219 | 0.999 | 3.216 |
esa | 54 | 37 | 9.382 | 1.000 | 9.380 |
jpl | 69 | 29 | 4.119 | 0.987 | 4.064 |
sio | 140 | 43 | 1.724 | 0.999 | 1.723 |
mit | 162 | 45 | 3.757 | 0.841 | 3.158 |
igs | 152 | 47 | 1.244 | 1.017 | 1.265 |
---------------|-----|-----|---------------|---------------|---------------|
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 39 | 1.5 1.2 -1.3 | 3.3 4.3 13.4 |
emr 31 | 0.0 1.4 0.4 | 5.2 5.6 13.1 |
esa 36 | -1.0 0.4 0.0 | 6.9 6.0 13.5 |
jpl 28 | 0.5 0.5 -0.7 | 3.3 5.3 11.0 |
sio 42 | 0.1 0.7 -2.3 | 3.1 3.8 11.8 |
mit 44 | 1.4 0.4 -1.4 | 2.9 4.0 11.0 |
---------------|---------------------------|---------------------------|
5-2-2) With respect to the Weekly Combination:
=================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 118 | 2.2 0.8 -0.7 | 2.4 2.5 10.3 |
emr 47 | -0.3 0.6 0.9 | 2.5 4.3 8.7 |
esa 53 | -0.9 0.0 1.9 | 4.2 5.0 7.8 |
jpl 66 | -0.1 0.9 -1.3 | 1.5 1.7 7.2 |
sio 134 | -0.2 -0.1 1.2 | 1.8 2.2 6.1 |
mit 146 | 1.6 0.2 -0.7 | 1.1 1.2 6.5 |
ITR 46 | 0.0 -0.4 -0.3 | 3.3 4.5 11.4 |
---------------|---------------------------|---------------------------|
5-2-3) With respect to the Cumulative Combination:
=====================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 119 | 2.0 2.2 -2.9 | 3.0 4.5 12.6 |
emr 48 | 0.3 0.6 0.8 | 4.1 6.3 11.4 |
esa 54 | -1.0 0.7 0.6 | 5.9 6.5 8.8 |
jpl 66 | 0.2 1.5 -1.6 | 2.2 3.4 9.5 |
sio 135 | -0.5 1.2 -0.7 | 3.3 3.7 8.5 |
mit 147 | 1.5 1.5 -2.8 | 2.4 3.6 9.0 |
igs 152 | -0.2 1.3 -1.8 | 2.5 2.8 6.8 |
ITR 50 | -0.1 0.0 -0.2 | 1.7 2.5 6.9 |
---------------|---------------------------|---------------------------|
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 | 0.160 -0.199 0.005 15.2 20.0 -13.1 2.61 |
emr | -0.033 -0.024 -0.042 6.7 16.0 0.9 2.19 |
esa | 0.066 0.008 0.007 0.9 14.0 -4.1 1.30 |
jpl | -0.063 0.023 -0.102 -12.9 15.0 -30.7 2.35 |
sio | 0.237 -0.073 -0.082 9.0 16.3 29.9 1.99 |
mit | -0.006 0.007 -0.016 -1.6 -0.8 -2.4 2.46 |
---------------|---------------------------------------------------------------|
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 | 0.063 0.064 0.071 1.6 1.6 1.6 0.26 |
emr | 0.069 0.069 0.081 1.8 1.8 1.8 0.28 |
esa | 0.067 0.067 0.075 1.7 1.7 1.7 0.27 |
jpl | 0.074 0.071 0.086 1.9 1.9 1.9 0.30 |
sio | 0.061 0.062 0.069 1.6 1.6 1.6 0.25 |
mit | 0.059 0.060 0.069 1.6 1.6 1.5 0.24 |
---------------|---------------------------------------------------------------|
5-4) Geocenter:
====================
| X Y Z | s X s Y s Z |
| (mm) (mm) (mm) | (mm) (mm) (mm) |
---------------|---------------------------|---------------------------|
igs | 0.4 13.3 -32.7 | 2.5 3.0 7.0 |
---------------|---------------------------|---------------------------|
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 | --- 9.6 3.7 .6 4.2 -2.2 |
emr | --- 1.3 -1.5 -15.5 4.8 1.9 |
esa | --- 11.7 -4.8 1.9 -8.6 1.3 |
jpl | --- -7.3 3.3 -2.8 -.6 15.4 |
sio | --- -12.6 -4.2 -10.2 10.4 -10.6 |
mit | --- -199.4 4.1 .3 3.9 .5 |
ITR | --- --- --- --- --- --- |
BuA | --- 1.6 2.0 .5 21.4 .6 |
---------------|------------------------------------------------------------|
5-5-2) STD :
===============
Solution | UT LOD XPO XPOR YPO YPOR |
| us us .01mas .01ma/d .01mas .01ma/d |
---------------|------------------------------------------------------------|
cod | --- 16.6 6.3 13.7 6.2 17.4 |
emr | --- 23.8 5.0 26.0 7.2 21.1 |
esa | --- 15.5 4.9 18.3 4.9 20.9 |
jpl | --- 22.7 4.7 13.6 2.8 15.8 |
sio | --- 5.8 4.9 13.8 4.3 10.7 |
mit | --- 150.5 1.5 2.6 1.3 3.7 |
ITR | --- --- --- --- --- --- |
BuA | --- 25.9 4.3 6.3 6.0 11.7 |
---------------|------------------------------------------------------------|
5-6) Outliers:
===================
Thresholds set at 5 sigmas and 50 mm.
Solution Solution | Station | N E U |
Minus |code id soln| (mm) (mm) (mm)|
-----------------------------------------|------------|-----------------------|
| | |
IGS00P04_RS51.snx esa11297.snx |NLIB A ----| -2.6 -18.3 58.7|
| | |
IGS00P04_RS51.snx sio11297.snx |TSKB A ----| -6.4 -7.2 37.5|
| | |
cod11297.snx esa11297.snx |RIOG A ----| 13.3 -0.4 52.0|
| | |
IGS01P34.snx igs01P1129.snx |COCO A ----| 5.5 -23.3 4.0|
-----------------------------------------|------------|-----------------------|
5-7) Conflicts:
===========================
5-7-1) Station Name Conflicts:
=============================
IERS DOMES NO cod emr esa jpl sio IGS igs
============= ====== ====== ====== ====== ====== ====== ======
42005M001 GALA A GALA A GALA B GALA A GALA A GALA A GALA A
13407S012 MADR A MAD2 A MADR A MADR A
40405S031 GOLD A GOL2 A GOLD A GOLD A
40114M001 NRC1 A NRC1 A NRC1 A NRC1 A NRC1 A NRC1 A NRC1 A
NRC2 A
50103M108 TIDB A TIDB A TID2 A TIDB A TID2 A TIDB A TIDB A
22306M002 IISC A IISC B IISC A IISC A IISC A IISC A
50107M004 YAR1 A YAR1 A YAR1 A YAR1 A YAR1 A YAR1 A
YAR2 A
22003M001 PIMO B PIMO A PIMO A PIMO A PIMO A
MISSING IERS DOMES NOS AT IGS:
-----------------------------
ELAT A
IERS DOMES NO mit IGS igs
============= ====== ====== ======
13407S012 MADR A MADR A MADR A
MAD2 A
31303M001 MAS1 A
31303M002 MAS1 A MAS1 A
40114M001 NRC1 A NRC1 A NRC1 A
NRC2 A
40405S031 GOLD A GOLD A GOLD A
GOL2 A
50103M108 TIDB A TIDB A TIDB A
TID2 A
50107M004 YAR1 A YAR1 A YAR1 A
YAR2 A
12309M001 MDVO A
12309M002 MDVO A MDVO A
MISSING IERS DOMES NOS AT IGS:
-----------------------------
ELAT A
5-7-2) Station Antenna Conflicts:
================================
_______________________
|Enforcing these aliases|
|_______________________|
TIDB A: TID2 A
PIMO A: PIMO B
IISC A: IISC B
GALA A: GALA B
YAR1 A: YAR2 A
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)
Compare to file IGS.SNX (IGS).
Antenna Conflicts in file cod11297.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
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 mit1129g.snx (mit).
------- --------- -- ----
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.)
=== ==== == ==== ==== ==== ==== ==== ==== ==== ==== ====
mit 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 sio11297.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
The following files have no antenna conflicts:
- emr11297.snx (emr)
- esa11297.snx (esa)
- jpl11297.snx (jpl)
--
More information about the IGSREPORT
mailing list