[IGSREPORT-7209] Wk 1061 IGS SINEX Combination
Remi Ferland
ferland at geod.nrcan.gc.ca
Fri May 26 10:38:26 PDT 2000
******************************************************************************
IGS Electronic Report 26 May 10:38:44 PDT 2000 Message Number 7209
******************************************************************************
Author: R. Ferland , D. Hutchison
===================================================================
Combined AC solution for GPS week 1061 - 00/05/07 to 00/05/13
===================================================================
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
igs00P1061.snx Combined weekly solution.
igs00P1061.erp Daily Earth Rotation Parameters.
igs00p02.erp Daily Earth Rotation Parameters since GPS week 1013.
IGS00P19.snx Cumulative Combined solution.
igs00P1061.sum This file.
igs00P1061.itr Residuals between the AC and the ITRF97 for the RF stations.
igs00P1061.res Residuals between the AC and the Combined Weekly solution.
IGS00P19.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
ITRF97 Reference Frame (RF) stations at the current epoch.
ftp://igscb.jpl.nasa.gov/igscb/station/coord/ITRF97_IGS_RS51.SNX.Z
3-4) The AC are compared to ITRF, 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 ITRF97 of the current
epoch using a 7-parameters transformation. The singular cumulative
combined solution is aligned to the ITRF97 of the reference epoch
using a 14-parameters transformation and the 51 ITRF station positions
and velocities.
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:
===========
igs = igs00P1061.snx
IGS = IGS00P19.snx
BuA = IERS Bulletin A
mit are used to quality control the weekly combination.
emr gfz sio excluded from the geocenter estimation (Sec. 5-4).
Exceptionnaly, one AC is missing. Note that the GNAACs NCL and the JPL
were eager to submit their current combination. To avoid several
hours of extra delays from my part to add the NCL and JPL, I am
submitting the most up to date combination. This, I hope will
allow the people at code to complete their orbit combination at
a reasonnable time.
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 | 43 | 28.900 | 1.000 | 28.899 |
emr | 37 | 20 | 3.298 | 1.001 | 3.301 |
esa | 57 | 39 | 11.458 | 1.000 | 11.458 |
gfz | 67 | 35 | 18.866 | 1.000 | 18.865 |
jpl | 77 | 36 | 3.967 | 1.000 | 3.966 |
sio | 126 | 46 | 1.847 | 1.000 | 1.847 |
mit | 150 | 44 | 2.923 | 0.888 | 2.595 |
igs | 137 | 48 | 1.419 | 1.000 | 1.419 |
---------------|-----|-----|---------------|---------------|---------------|
5-2) Solution Residuals weighted Average & STD :
=====================================================
5-2-1) With respect to ITRF97 Reference Frame stations:
=========================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 42 | -0.8 -0.6 0.8 | 2.7 5.2 12.5 |
emr 19 | -0.4 0.4 0.9 | 7.2 7.1 10.9 |
esa 38 | 0.0 -0.2 -0.4 | 5.4 6.7 16.9 |
gfz 34 | -0.2 -0.3 0.8 | 4.1 5.5 12.1 |
jpl 35 | -2.6 0.2 1.3 | 4.3 5.4 14.2 |
sio 44 | -1.5 0.3 0.1 | 3.3 5.8 11.8 |
mit 43 | -0.1 -0.1 0.5 | 4.2 4.2 7.2 |
---------------|---------------------------|---------------------------|
5-2-2) With respect to Weekly Combination:
============================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 117 | 0.0 -0.6 1.2 | 2.2 2.5 9.6 |
emr 36 | 2.2 -0.3 1.7 | 5.5 4.8 6.6 |
esa 57 | 1.1 -1.0 -2.7 | 4.4 4.0 9.3 |
gfz 63 | 1.5 0.1 -0.9 | 1.7 2.2 5.1 |
jpl 74 | -1.2 -0.7 0.2 | 2.1 3.0 7.5 |
sio 119 | -0.6 0.0 1.1 | 2.1 2.4 5.7 |
mit 129 | 0.3 -0.2 3.1 | 2.1 1.7 7.4 |
ITR 47 | 0.4 0.2 -1.0 | 5.8 5.5 12.8 |
---------------|---------------------------|---------------------------|
5-2-3) With respect to Cumulative Combination:
================================================
Solution | Weighted Average (mm) | STD (mm) |
| N E U | N E U |
---------------|---------------------------|---------------------------|
cod 117 | -1.4 0.5 -0.9 | 3.9 3.5 12.1 |
emr 36 | 1.0 0.2 0.0 | 5.7 6.1 7.4 |
esa 57 | 0.3 -0.4 -4.7 | 5.6 5.2 12.7 |
gfz 63 | 0.2 0.6 -2.9 | 2.2 3.2 6.7 |
jpl 74 | -2.2 0.2 -0.8 | 3.5 4.4 10.0 |
sio 119 | -1.8 1.2 -1.0 | 3.1 4.0 8.2 |
mit 130 | -0.7 0.8 1.5 | 4.2 2.6 8.6 |
igs 137 | -1.2 0.9 -1.9 | 2.9 2.8 6.8 |
ITR 51 | 0.5 0.4 -1.5 | 2.8 3.7 10.6 |
---------------|---------------------------|---------------------------|
5-3) 7-Parameters Transformation: AC ----> ITRF97_IGS_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 | -0.010 0.049 -0.052 8.6 -4.9 -11.3 3.06 |
emr | -0.003 0.041 -0.039 12.7 -6.2 -53.6 1.66 |
esa | 0.029 -0.025 -0.001 -2.5 11.8 13.9 1.75 |
gfz | -0.094 0.026 0.006 -1.4 2.3 -4.4 1.73 |
jpl | 0.024 -0.012 0.020 -5.3 -4.4 -21.2 2.44 |
sio | -0.134 0.025 0.186 9.1 -6.3 59.6 2.26 |
mit | -0.023 -0.012 0.020 -0.9 0.0 -2.2 1.08 |
---------------|---------------------------------------------------------------|
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 | 0.060 0.062 0.070 1.6 1.6 1.6 0.25 |
emr | 0.086 0.090 0.107 2.3 2.3 2.3 0.36 |
esa | 0.067 0.067 0.071 1.7 1.7 1.7 0.27 |
gfz | 0.067 0.067 0.079 1.7 1.7 1.7 0.27 |
jpl | 0.066 0.066 0.074 1.7 1.7 1.7 0.27 |
sio | 0.058 0.059 0.067 1.5 1.5 1.5 0.24 |
mit | 0.060 0.061 0.070 1.6 1.6 1.6 0.24 |
---------------|---------------------------------------------------------------|
5-4) Geocenter:
====================
| X Y Z | s X s Y s Z |
| (mm) (mm) (mm) | (mm) (mm) (mm) |
---------------|---------------------------|---------------------------|
igs | 2.7 -0.6 -16.2 | 6.3 6.3 8.7 |
---------------|---------------------------|---------------------------|
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 | --- -17.3 -5.4 1.4 2.7 2.5 |
emr | --- -11.3 -11.1 -60.1 9.0 3.1 |
esa | --- -32.6 4.8 -.3 -14.9 -1.5 |
gfz | --- -6.6 -5.0 -1.8 5.4 -2.6 |
jpl | --- 12.7 -5.8 32.7 3.5 -17.5 |
sio | --- 33.9 6.2 -1.7 -1.5 -1.7 |
mit | --- -13.4 .1 .1 -4.2 .1 |
ITR | --- --- --- --- --- --- |
BuA | --- -33.2 -1.8 -.9 16.5 1.2 |
---------------|------------------------------------------------------------|
5-5-2) STD :
===============
Solution | UT LOD XPO XPOR YPO YPOR |
| us us .01mas .01ma/d .01mas .01ma/d |
---------------|------------------------------------------------------------|
cod | --- 12.4 2.6 9.3 4.3 5.3 |
emr | --- 26.9 11.0 21.0 8.4 31.6 |
esa | --- 26.1 6.1 26.0 6.8 11.4 |
gfz | --- 12.2 2.9 5.4 3.6 6.0 |
jpl | --- 39.3 5.2 21.3 7.5 10.9 |
sio | --- 12.8 4.7 9.1 4.9 8.8 |
mit | --- 12.9 1.6 2.6 1.2 3.7 |
ITR | --- --- --- --- --- --- |
BuA | --- 8.5 5.9 10.3 3.8 9.0 |
---------------|------------------------------------------------------------|
5-6) Outliers:
===================
Thresholds set at 5 sigmas and 50 mm.
Solution Solution | Station | N E U |
Minus |code id soln| (mm) (mm) (mm)|
-----------------------------------------|------------|-----------------------|
| | |
ITRF97_IGS_RS51.snx emr10617.snx |MALI A ----| 3.4 7.3 -55.7|
| | |
ITRF97_IGS_RS51.snx esa10617.snx |MCM4 A ----| 11.5 6.5 -56.2|
| | |
ITRF97_IGS_RS51.snx gfz10617.snx |ZWEN A ----| 38.7 -37.3 36.6|
| | |
IGS00P18.snx cod10617.snx |LAMA A ----| 10.5 -23.3 -1.4|
| | |
IGS00P18.snx gfz10617.snx |ARTU A ----| 2.6 0.2 -39.8|
| | |
IGS00P18.snx jpl10617.snx |ARTU A ----| -1.3 1.5 -38.4|
| | |
IGS00P18.snx sio10617.snx |LAMA A ----| 10.8 -22.0 -11.2|
IGS00P18.snx sio10617.snx |MADR A ----| 0.4 18.9 6.4|
IGS00P18.snx sio10617.snx |ZWEN A ----| 31.7 -27.9 36.8|
| | |
IGS00P18.snx mit1061g.snx |LAMA A ----| 9.5 -21.1 -1.5|
-----------------------------------------|------------|-----------------------|
5-7) Conflicts:
====================
IERS DOMES NO cod emr esa gfz jpl sio IGS igs
============= ====== ====== ====== ====== ====== ====== ====== ======
31303M002 MAS1 A MAS1 A MASP A MAS1 A MAS1 A MAS1 A MAS1 A MAS1 A
12353M001 YAKZ A YAKZ A YAKZ A YAKA A YAKA A
40405S031 GOL2 A GOL2 A GOL2 A GOL2 A GOLD A GOLD A
42005M001 GALA A GALA B GALA A GALA A GALA A GALA A GALA A
50103M108 TID2 A TID2 A TID2 A TID1 A TID2 A TIDB A TIDB A
13407S012 MAD2 A MADR A
MISSING IERS DOMES NOS AT gfz:
-----------------------------
BISH A
IERS DOMES NO mit IGS igs
============= ====== ====== ======
13407S012 MAD2 A MADR A
31303M001 MAS1 A
31303M002 MAS1 A MAS1 A
40405S031 GOL2 A GOLD A GOLD A
50103M108 TID2 A TIDB A TIDB A
TID1 A
12353M001 YAKZ A YAKA A YAKA A
12309M001 MDVO A
12309M002 MDVO A MDVO A
MISSING IERS DOMES NOS AT mit:
-----------------------------
BISH A
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