Subject: [IGSREPORT-10097] Wk 1208 IGS SINEX Combination
From: Remi Ferland <[email-masked]>
To: [email-masked] (IGS Report Mailbox)
Date: Thu, 20 Mar 2003 18:25:33 EST

******************************************************************************
IGS Electronic Report   20 Mar 15:25:36 PST 2003      Message Number 10097
******************************************************************************

Author:  R. Ferland , D. Hutchison

===================================================================
 Combined AC  solution for GPS week 1208 -  03/03/02 to 03/03/08
===================================================================

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

2) Products:
============
All products are available at cddisa.gsfc.nasa.gov

igs03P1208.snx  Combined weekly solution. 
igs03P1208.erp  Daily Earth Rotation Parameters.
igs00p02.erp    Daily Earth Rotation Parameters since GPS week 1013.
IGS03P10.snx    Cumulative Combined solution. 
igs03P1208.sum  This file.
igs03P1208.itr  Residuals between the AC and the IGS00 for the RF stations. 
igs03P1208.res  Residuals between the AC and the Combined Weekly solution.
IGS03P10.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 = igs03P1208.snx  ( Weekly Combination )
     IGS = IGS03P10.snx   ( Cumulative Solution )

     BuA = IERS Bulletin A

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

     Solutions with manual station deletion:
         After unconstraining:
             esa  PIMO
             jpl  IISC  KELY
             ngs  KOKB
             ncl  QAQ1

     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            | 152 |  44 |        24.728 |         1.000 |        24.735 |
emr            |  45 |  24 |         4.725 |         1.000 |         4.727 |
esa            |  59 |  39 |        12.282 |         1.000 |        12.288 |
gfz            | 178 |  44 |        10.984 |         1.001 |        10.992 |
jpl            |  80 |  26 |         4.175 |         1.000 |         4.177 |
ngs            |  75 |  45 |        30.455 |         1.002 |        30.511 |
sio            | 143 |  46 |         2.048 |         1.000 |         2.049 |
mit            | 223 |  44 |         2.238 |         0.918 |         2.053 |
ncl            | 136 |  46 |         1.118 |         0.923 |         1.032 |
igs            | 196 |  46 |         1.392 |         0.992 |         1.381 |
---------------|-----|-----|---------------|---------------|---------------|

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         43 |     0.9      0.6     -0.5 |     3.2      3.7     11.2 |
emr         23 |     0.3      0.5      0.9 |     3.6      3.1     11.1 |
esa         38 |    -4.7      0.6      1.0 |     8.7      7.2     15.3 |
gfz         43 |     0.5      0.6      0.6 |     3.3      3.8      9.0 |
jpl         25 |     0.0      0.2      0.4 |     2.9      3.1     11.6 |
ngs         44 |    -1.4      0.1      0.6 |     5.1      5.6     14.4 |
sio         45 |    -0.3      0.9      1.1 |     3.5      4.4      9.8 |
mit         43 |    -0.2      0.8      0.7 |     3.5      3.3      8.4 |
ncl         45 |     0.0      0.5      0.5 |     3.2      3.0      6.2 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        149 |     0.4      0.3      0.2 |     1.5      1.1      6.8 |
emr         45 |     1.0      0.4     -0.7 |     2.2      2.3      8.3 |
esa         59 |    -5.1     -0.5      0.6 |     6.5      5.6     11.6 |
gfz        174 |     0.2      0.2     -1.0 |     1.1      1.2      5.1 |
jpl         80 |    -0.6      0.0     -1.3 |     1.6      1.7      7.9 |
ngs         74 |    -1.4     -1.5      0.3 |     3.2      6.0     12.5 |
sio        135 |    -0.1     -0.2      1.2 |     2.2      2.7      4.3 |
mit        189 |    -0.5      0.0     -0.4 |     1.0      1.3      3.0 |
ncl        135 |    -0.3      0.0      1.0 |     0.8      0.6      3.5 |
ITR         45 |    -0.3     -0.8      0.0 |     3.5      3.2      8.9 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        135 |     0.3      0.3      2.2 |     2.4      2.6      9.6 |
emr         41 |     0.7      0.7      0.1 |     2.5      2.4     10.7 |
esa         58 |    -5.6     -0.5      1.8 |     7.8      6.3     13.8 |
gfz        141 |    -0.1      0.0      1.1 |     2.4      2.7      9.0 |
jpl         73 |    -0.7     -0.1      0.0 |     2.0      2.8      9.5 |
ngs         74 |    -1.6     -1.4      1.8 |     3.9      6.9     14.0 |
sio        123 |    -0.2      0.0      3.5 |     3.2      3.9      8.1 |
mit        149 |    -0.7      0.2      1.4 |     2.4      2.9      6.6 |
ncl        127 |    -0.5     -0.1      3.0 |     2.2      2.2      6.1 |
igs        153 |    -0.3     -0.1      1.9 |     2.1      2.2      6.8 |
ITR         54 |    -0.3     -0.5      0.1 |     1.6      1.8      3.5 |
---------------|---------------------------|---------------------------|

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            |   0.008   -0.008   -0.026      7.3      4.9     -3.6     1.17 |
emr            |  -0.028   -0.095   -0.045    -19.5      4.8      1.0     1.18 |
esa            |   0.031   -0.037    0.054    -10.5     14.9    -20.7     1.11 |
gfz            |   0.010   -0.018    0.054     -2.0      0.7     -1.6     1.08 |
jpl            |   0.023   -0.005   -0.003    -13.9     10.4     -2.9     0.53 |
ngs            |  -0.079   -0.168    0.056      6.4    -12.6    -17.4     1.38 |
sio            |  -0.200    0.014    0.001      9.5     -9.6     54.4     1.54 |
mit            |   0.005   -0.017    0.002      1.4     -1.0      0.9     1.48 |
ncl            |  -0.037   -0.055   -0.029      0.6     -1.4     -2.9     0.84 |
---------------|---------------------------------------------------------------|

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    0.061    0.067      1.6      1.6      1.6     0.24 |
emr            |   0.081    0.082    0.092      2.1      2.1      2.1     0.33 |
esa            |   0.066    0.070    0.071      1.8      1.7      1.7     0.27 |
gfz            |   0.060    0.061    0.068      1.6      1.6      1.6     0.24 |
jpl            |   0.079    0.080    0.093      2.1      2.1      2.1     0.33 |
ngs            |   0.059    0.060    0.068      1.6      1.6      1.6     0.24 |
sio            |   0.058    0.060    0.067      1.5      1.5      1.5     0.24 |
mit            |   0.059    0.061    0.069      1.6      1.6      1.6     0.24 |
ncl            |   0.058    0.060    0.067      1.5      1.5      1.5     0.24 |
---------------|---------------------------------------------------------------|

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

               |      X        Y        Z  |    s X      s Y      s Z  |
               |    (mm)     (mm)     (mm) |    (mm)     (mm)     (mm) |
---------------|---------------------------|---------------------------|
igs            |     5.6     -3.7      1.7 |     2.2      1.7      4.8 |
---------------|---------------------------|---------------------------|

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            |     ---         .4      -1.6       ---      -2.2       --- |
emr            |     ---      -13.5       1.3     -29.2       4.1        .3 |
esa            |     ---       -2.5     -16.9       ---       3.6       --- |
gfz            |     ---       -4.8        .2       6.7       5.0      -2.1 |
jpl            |     ---      -22.1      -5.0     -32.4        .3      -1.0 |
ngs            |     ---       25.1      -3.4     -23.2      13.6     -18.8 |
sio            |     ---       19.9       9.6      15.9      -1.4      -1.6 |
mit            |     ---       16.6       4.0      12.1        .4       2.5 |
ncl            |     ---        2.7      -6.0       ---        .3       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---        -.6     -13.5       9.4      29.4       4.5 |
---------------|------------------------------------------------------------|

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

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---        4.8       1.2       ---       1.8       --- |
emr            |     ---        6.5       2.9       9.5       3.6      19.4 |
esa            |     ---        9.8       5.2       ---       8.5       --- |
gfz            |     ---        4.2       2.3       8.4       2.0      12.3 |
jpl            |     ---       49.4       1.3       3.6       4.0       5.6 |
ngs            |     ---       31.2       4.9      50.6       6.2      37.9 |
sio            |     ---        9.4       2.1       7.9       3.3       8.1 |
mit            |     ---        2.8       3.2       6.5       1.9      10.0 |
ncl            |     ---        5.7       1.2       ---        .8       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       21.9       5.6       5.9       6.2       9.4 |
---------------|------------------------------------------------------------|

5-6)      Outliers:
===================

Thresholds set at 5 sigmas and 50 mm.

 Solution             Solution           |  Station   |    N       E       U  |
              Minus                      |code id soln|   (mm)    (mm)    (mm)|
-----------------------------------------|------------|-----------------------|
                                         |            |                       |
IGS01P37_RS54.snx    jpl12087.snx        |TIDB  A ----|    3.4    -0.2   -94.5|
                                         |            |                       |
IGS01P37_RS54.snx    jpl12087.snx        |KOUR  A ----|   -1.1    -4.1    53.5|
IGS01P37_RS54.snx    jpl12087.snx        |MAC1  A ----|   -2.3     0.2    42.5|
IGS01P37_RS54.snx    jpl12087.snx        |YAR1  A ----|   -1.2     0.6   -64.8|
                                         |            |                       |
jpl12087.snx         sio12087.snx        |STJO  A ----|   -2.7    -1.9   -41.3|
jpl12087.snx         sio12087.snx        |WUHN  A    2|    4.1    -4.2    51.6|
                                         |            |                       |
IGS03P09.snx         cod12087.snx        |RESO  A ----|    7.8   -14.1     1.1|
                                         |            |                       |
IGS03P09.snx         emr12087.snx        |KELY  A ----|   -0.8     2.4    57.6|
                                         |            |                       |
IGS03P09.snx         gfz12087.snx        |PRDS  A ----|   20.8    -1.5    -3.4|
IGS03P09.snx         gfz12087.snx        |RESO  A ----|    9.1   -13.2    -3.6|
IGS03P09.snx         gfz12087.snx        |USNA  A ----|   -7.4    17.0     4.1|
                                         |            |                       |
IGS03P09.snx         jpl12087.snx        |VNDP  A ----|   -4.0    -1.1    80.9|
                                         |            |                       |
IGS03P09.snx         jpl12087.snx        |RESO  A ----|    6.0   -14.8    13.8|
                                         |            |                       |
IGS03P09.snx         sio12087.snx        |PRDS  A ----|   19.0    -1.8   -11.1|
                                         |            |                       |
IGS03P09.snx         mit1208g.snx        |UPO1  A ----|    4.5     5.7   106.4|
                                         |            |                       |
IGS03P09.snx         mit1208g.snx        |PRDS  A ----|   18.6    -1.8    -6.8|
IGS03P09.snx         mit1208g.snx        |VNDP  A ----|   -4.4    -1.9    69.1|
                                         |            |                       |
IGS03P09.snx         ncl1208g.snx        |KELY  A ----|   -1.1     3.1    45.3|
                                         |            |                       |
IGS03P09.snx         igs03P1208.snx      |HERS  A ----|    0.8    10.1     7.5|
-----------------------------------------|------------|-----------------------|

5-7)      Conflicts:
====================

IERS DOMES NO    cod    emr    esa    gfz    jpl    ngs    sio    IGS    igs
============= ====== ====== ====== ====== ====== ====== ====== ====== ======
    42202M005 AREQ A AREQ A        AREQ A AREQ A AREQ B        AREQ A AREQ A
    40405S031 GOLD A        GOLD A GOLD A        GOL2 A GOL2 A GOLD A GOLD A
    22306M002 IISC A IISC A IISC B IISC A IISC A IISC B IISC A IISC A IISC A
    13407S012 MADR A               MADR A MAD2 A        MAD2 A MADR A MADR A
    22003M001 PIMO A PIMO A PIMO B PIMO A PIMO A        PIMO A PIMO A PIMO A
    30314M002 SUTH A        SUTH B SUTH A        SUTH A SUTH A SUTH A SUTH A
    50103M108 TIDB A        TIDB A TIDB A TID1 A TID2 A TID2 A TIDB A TID1 A
                                   TID1 A TIDB A        TIDB A        TIDB A
                                   TID2 A 
    50107M004 YAR2 A                      YAR2 A        YAR2 A YAR1 A YAR1 A
 
MISSING IERS DOMES NOS AT gfz:
-----------------------------
  BISH A  PMON A  PALM A
 
MISSING IERS DOMES NOS AT sio:
-----------------------------
  YAIG A  CAVA A  SFEL A  VOLT A  BRAS A
 
MISSING IERS DOMES NOS AT igs:
-----------------------------
  YAIG A
IERS DOMES NO    mit    ncl    IGS    igs
============= ====== ====== ====== ======
    13407S012 MADR A        MADR A MADR A
              MAD2 A 
    40405S031 GOLD A GOLD A GOLD A GOLD A
              GOL2 A 
    50103M108 TIDB A TID2 A TIDB A TID1 A
              TID1 A TIDB A        TIDB A
              TID2 A 
    50107M004 YAR2 A YAR2 A YAR1 A YAR1 A
    13506M005 WSRT A WSRT A WSRT A WSRT A
 
MISSING IERS DOMES NOS AT mit:
-----------------------------
  PMON A  BISH A
 
MISSING IERS DOMES NOS AT igs:
-----------------------------
  YAIG A
--