Subject: [IGSREPORT-18206] Wk 1565 IGS SINEX Combination
From: "IGS SINEX" <[email-masked]>
To: [email-masked]
Cc: [email-masked]
Date: Wed, 20 Jan 2010 21:02:59 -0500

******************************************************************************
IGS Electronic Report   20 Jan 18:03:32 PST 2010      Message Number 18206
******************************************************************************

Author:  R. Ferland, M. Piraszewski

===============================================================
 Combined AC solution for GPS week 1565 - 10/01/03 to 10/01/09
===============================================================

1) Contacts:
============
e-mail: [email-masked]
Tel:    (613)995-4002 (Remi Ferland)
Fax:    (613)995-3215

2) Products:
============
All products are available at:
  CDDIS (cddis.gsfc.nasa.gov) and SOPAC (garner.ucsd.edu)

igs10P1565.snx  Combined weekly solution. 
igs10P1565.erp  Daily Earth Rotation Parameters.
igs00p03.erp    Daily Earth Rotation Parameters since GPS week 860. 
IGS10P01.snx    Cumulative Combined solution. 
igs10P1565.sum  This file.
igs10P1565.itr  Residuals between the AC and the IGS05 for the RF stations. 
igs10P1565.res  Residuals between the AC and the Combined Weekly solution.
IGS10P01.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
     IGS05 stations at the current epoch.
     ftp://igscb.jpl.nasa.gov/igscb/station/coord/IGS05.snx
3-4) The AC are compared to IGS05, 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 IGS05 of the current
     epoch using a 7-parameters transformation. The singular cumulative
     combined solution is aligned to the IGS05 of the reference epoch
     using a 14-parameters transformation and the 132 ITRF station positions
     and velocities. The IGS05 is a realization of ITRF2005.

     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 = IGS05.snx
     igs = igs10P1565.snx
     IGS = IGS10P01.snx

     MIT = mit15657.snx
     mit = mit1565g.snx

     BuA = IERS Bulletin A

     grg mit ncl are used to quality control the weekly combination.
     gfz excluded from the geocenter estimation (Sec. 5-4).

     Solutions with manual station deletion:
         From the original solution:
             cod  SATA  X  Y  Z
             emr  SATA  X  Y  Z
             esa  SATA  X  Y  Z
             gfz  SATA  X  Y  Z
             MIT  SATA  X  Y  Z
             sio  SATA  X  Y  Z
             mit  SATA  X  Y  Z
         After unconstraining:
             grg  ASPA

     4-1) Starting with GPS week 1400, the solutions are aligned to the
          IGS05.snx realization of ITRF2005.

     4-2) Starting with GPS week 1078, UT1-UTC from IERS Bulletin A
          is included in the erp files.

     4-3) Starting with GPS week 1412, the accumulated ERP file has been
          changed from "igs00p02.erp" to "igs00p03.erp". The main changes
          are:
       1) Correction of the pole position from IGb00 to IGS05 using the
          transformation in:
             http://igscb.jpl.nasa.gov/mail/igsmail/2006/msg00178.html
       2) Marginal ERP's in GPS week 1161 were replaced by reprocessed
          values.

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            | 225 |  63 |        30.972 |         1.000 |        30.973 |
emr            |  85 |  41 |         7.355 |         1.000 |         7.355 |
esa            | 123 |  39 |         5.749 |         1.000 |         5.749 |
gfz            | 186 |  61 |        18.787 |         1.000 |        18.788 |
jpl            | 124 |  42 |        11.048 |         1.000 |        11.048 |
MIT            | 243 |  67 |         3.119 |         1.000 |         3.119 |
ngs            | 206 |  64 |        48.881 |         1.000 |        48.882 |
sio            | 251 |  65 |         3.134 |         1.000 |         3.134 |
grg            | 100 |  39 |        11.098 |         1.000 |        11.098 |
mit            | 413 |  64 |         2.483 |         1.000 |         2.483 |
ncl            | 215 |  67 |         1.383 |         1.002 |         1.385 |
igs            | 362 |  70 |         1.598 |         1.000 |         1.598 |
---------------|-----|-----|---------------|---------------|---------------|

5-2)      Solution Residuals weighted Average & STD:
====================================================

5-2-1)    With respect to the IGS05 stations:
=============================================

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod         63 |    -1.2      0.2      0.0 |     3.3      2.8      8.4 |
emr         41 |     0.0      0.1      0.1 |     3.7      3.8      8.8 |
esa         39 |     0.4     -0.1      0.4 |     3.3      3.4      8.3 |
gfz         61 |    -0.9      0.2      0.2 |     3.2      3.0      8.0 |
jpl         42 |    -0.6     -0.1     -0.5 |     3.6      3.9      8.6 |
MIT         67 |    -0.4      0.3      0.6 |     3.2      3.2      7.7 |
ngs         64 |     0.1      0.0      0.2 |     2.9      3.1      8.0 |
sio         65 |    -0.1      0.2      0.4 |     3.7      3.1      8.0 |
grg         39 |    -0.4      0.1      0.2 |     4.6      3.0      7.4 |
mit         63 |    -0.7      0.1      0.1 |     2.9      3.0      6.9 |
ncl         67 |    -0.5      0.2      0.0 |     3.2      3.3      7.6 |
---------------|---------------------------|---------------------------|

5-2-2)    With respect to the Weekly Combination:
=================================================

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        214 |    -0.7     -0.1      0.7 |     1.1      1.0      3.1 |
emr         83 |     0.4     -0.6      0.3 |     1.5      1.4      3.7 |
esa        118 |     0.9     -0.1      2.1 |     2.1      1.2      4.6 |
gfz        182 |    -0.1      0.1     -0.3 |     0.8      0.9      2.4 |
jpl        119 |    -0.1      0.0      0.2 |     1.6      2.4      5.7 |
MIT        219 |     0.2      0.1      0.3 |     0.6      0.7      1.9 |
ngs        191 |     0.9      0.0      0.0 |     1.3      1.6      3.0 |
sio        245 |     0.6      0.2      0.2 |     1.1      0.7      2.4 |
grg         96 |     0.0     -0.2     -0.1 |     3.8      2.6      5.6 |
mit        355 |    -0.3     -0.2     -0.4 |     0.3      0.3      1.3 |
ncl        210 |     0.0     -0.1      0.0 |     0.5      0.7      1.6 |
ITR         69 |     0.7     -0.2     -0.8 |     2.9      2.9      7.2 |
---------------|---------------------------|---------------------------|

5-2-3)    With respect to the Cumulative Combination:
=====================================================

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        190 |    -2.2      0.2      0.3 |     2.4      2.2      7.7 |
emr         75 |    -1.7     -0.1     -1.0 |     2.9      2.7      8.1 |
esa         98 |    -1.2      0.6      0.8 |     2.2      2.4      8.1 |
gfz        169 |    -1.9      0.4     -1.2 |     2.4      2.5      6.5 |
jpl        113 |    -1.9      0.2      0.1 |     2.9      3.9      7.8 |
MIT        194 |    -1.6      0.2     -0.5 |     2.3      2.2      6.3 |
ngs        174 |    -0.8      0.1     -1.0 |     2.4      3.1      7.3 |
sio        213 |    -0.8      0.0      0.1 |     2.6      2.2      6.9 |
grg         96 |    -1.5     -0.2      0.4 |     3.5      3.5      7.9 |
mit        273 |    -1.9     -0.1     -0.7 |     2.4      2.2      6.8 |
ncl        197 |    -1.7      0.1     -0.9 |     2.3      2.5      6.8 |
igs        275 |    -1.6      0.0     -0.3 |     2.2      2.1      6.4 |
ITR        112 |    -0.8     -0.1     -0.1 |     2.6      2.8     10.3 |
---------------|---------------------------|---------------------------|

5-3)      7-Parameters Transformation: AC ----> IGS05.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            |  -0.013   -0.005   -0.028     -0.1      1.2      0.1     0.18 |
emr            |   0.052   -0.012    0.011     13.9     -6.4      7.8     0.42 |
esa            |   0.048   -0.077    0.041      8.9      0.5      2.9     0.15 |
gfz            |   0.014   -0.015   -0.004      0.0      1.2      0.9     0.29 |
jpl            |   0.012   -0.049   -0.023      7.0      0.0     14.9     0.46 |
MIT            |  -0.007    0.007   -0.040      4.5     -1.3      1.5     0.34 |
ngs            |  -0.099   -0.119    0.019     10.0     -7.9     -0.1     0.35 |
sio            |  -0.010   -0.006    0.030      2.0      0.4      2.2     0.44 |
grg            |   0.024    0.020   -0.007      5.9     11.8      9.5     1.21 |
mit            |   0.010    0.016    0.004     -0.4      1.5      1.6     0.38 |
ncl            |   0.002    0.045    0.041     -0.4      0.5      1.8     0.37 |
igs            |   0.000    0.000    0.000      0.0      0.0      0.0     0.33 |
---------------|---------------------------------------------------------------|

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            |   0.050    0.051    0.058      1.3      1.3      1.3     0.21 |
emr            |   0.060    0.065    0.071      1.7      1.6      1.6     0.26 |
esa            |   0.060    0.065    0.071      1.6      1.6      1.6     0.26 |
gfz            |   0.051    0.052    0.057      1.3      1.3      1.3     0.21 |
jpl            |   0.059    0.062    0.069      1.6      1.6      1.6     0.25 |
MIT            |   0.049    0.051    0.055      1.3      1.3      1.3     0.20 |
ngs            |   0.050    0.052    0.056      1.3      1.3      1.3     0.21 |
sio            |   0.049    0.051    0.055      1.3      1.3      1.3     0.20 |
grg            |   0.062    0.066    0.074      1.7      1.7      1.7     0.26 |
mit            |   0.050    0.051    0.058      1.3      1.3      1.3     0.21 |
ncl            |   0.049    0.051    0.055      1.3      1.3      1.3     0.20 |
igs            |   0.000    0.000    0.000      0.0      0.0      0.0     0.12 |
---------------|---------------------------------------------------------------|

5-4)      Geocenter:
====================

               |      X        Y        Z  |    s X      s Y      s Z  |
               |    (mm)     (mm)     (mm) |    (mm)     (mm)     (mm) |
---------------|---------------------------|---------------------------|
igs            |     7.5     -3.6      1.2 |     1.5      1.1      3.3 |
---------------|---------------------------|---------------------------|

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            |     ---      -23.0       1.9       9.9      -0.9       1.6 |
esa            |     ---        4.5      -1.3      -1.5       1.2      -4.3 |
gfz            |     ---        1.1       0.5       8.6       1.2      -4.4 |
jpl            |     ---      -26.0       4.0      -0.1      -2.0       5.3 |
MIT            |     ---        2.8      -0.3     -10.6       0.8      -0.9 |
ngs            |     ---       -9.8       3.7      10.9      -3.2     -19.4 |
sio            |     ---       -7.2      -0.3       ---       1.9       --- |
grg            |     ---      -13.0      -6.5      42.7      -0.1      -6.2 |
mit            |     ---       -7.8      -3.1       9.5       0.0     -20.1 |
ncl            |     ---        ---       ---       ---       ---       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       -1.7       5.3       2.4       4.3       3.2 |
---------------|------------------------------------------------------------|

5-5-2)    STD:
==============

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---        ---       ---       ---       ---       --- |
emr            |     ---       11.4       3.0       7.7       1.9       5.5 |
esa            |     ---       13.3       2.1      11.3       2.4      11.1 |
gfz            |     ---       10.5       1.4       8.4       1.8       5.8 |
jpl            |     ---        8.6       1.6      13.8       2.1       2.9 |
MIT            |     ---        5.6       1.0       8.8       1.1       4.4 |
ngs            |     ---       11.8       4.7       3.7       4.2       9.8 |
sio            |     ---        6.4       1.9       ---       1.6       --- |
grg            |     ---       17.6       5.8      10.6       3.1      10.3 |
mit            |     ---        4.7       2.0       4.9       1.6       4.0 |
ncl            |     ---        ---       ---       ---       ---       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       23.6       4.4       8.2       4.0      15.8 |
---------------|------------------------------------------------------------|

5-6)      Satellite Antenna Offset Residuals weighted Average & STD:
====================================================================
          No Satellite phase center ... 

5-7)      Outliers:
===================

Thresholds set at 5 sigmas and 50 mm.

 Solution             Solution           |  Station   |    N       E       U  |
              Minus                      |code id soln|   (mm)    (mm)    (mm)|
-----------------------------------------|------------|-----------------------|
                                         |            |                       |
ITRF_IGS05.snx       emr15657.snx        |GRAS  A    3|   -9.3    17.4     1.8|
                                         |            |                       |
ITRF_IGS05.snx       jpl15657.snx        |NLIB  A    2|   -1.5    -1.3  -148.5|
                                         |            |                       |
ITRF_IGS05.snx       mit1565g.snx        |NLIB  A    2|   -0.9    -0.7  -147.3|
                                         |            |                       |
ITRF_IGS05.snx       mit1565g.snx        |GOLD  A    7|   -8.6    -1.5     8.5|
                                         |            |                       |
IGS09P52.snx         cod15657.snx        |VALD  A    1|  -12.5     7.7    -8.5|
                                         |            |                       |
IGS09P52.snx         MIT15657.snx        |CRU1  A    1|  -25.0    41.2    -5.3|
IGS09P52.snx         MIT15657.snx        |NETT  A    1|   12.6   -63.0     4.3|
                                         |            |                       |
IGS09P52.snx         MIT15657.snx        |SCH2  A    2|   -4.5     2.3    33.4|
                                         |            |                       |
IGS09P52.snx         sio15657.snx        |SCH2  A    2|   -2.9     2.0    35.5|
                                         |            |                       |
IGS09P52.snx         mit1565g.snx        |CRU1  A    1|  -25.7    40.7    -5.3|
IGS09P52.snx         mit1565g.snx        |NETT  A    1|   12.4   -63.6     2.7|
                                         |            |                       |
IGS09P52.snx         mit1565g.snx        |DGAR  A    1|  -12.5   -14.0   -11.8|
IGS09P52.snx         mit1565g.snx        |WUHN  A    4|  -11.0     0.2    -4.7|
                                         |            |                       |
IGS09P52.snx         igs10P1565.snx      |EIL1  A    1|   -5.6    -8.1   -21.6|
IGS09P52.snx         igs10P1565.snx      |TWTF  A    2|   -7.5    -1.1     2.5|
IGS09P52.snx         igs10P1565.snx      |UNSA  A    1|   -5.8    10.3    -7.0|
IGS09P52.snx         igs10P1565.snx      |YAKT  A    6|   -5.9     7.4     3.7|
-----------------------------------------|------------|-----------------------|