Subject: [IGSREPORT-12379] Wk 1313 IGS SINEX Combination
From: Martin Bourassa <[email-masked]>
To: [email-masked] (IGS Analysis Reports)
Cc: [email-masked] (Gerd Gendt), [email-masked] (Thomas Nischan)
Date: Thu, 24 Mar 2005 22:48:55 EST

******************************************************************************
IGS Electronic Report   24 Mar 19:49:00 PST 2005      Message Number 12379
******************************************************************************

Author:  R. Ferland , D. Hutchison

===================================================================
 Combined AC  solution for GPS week 1313 -  05/03/06 to 05/03/12
===================================================================

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 and at garner.ucsd.edu

igs05P1313.snx  Combined weekly solution. 
igs05P1313.erp  Daily Earth Rotation Parameters.
igs00p02.erp    Daily Earth Rotation Parameters since GPS week 1013.
IGS05P10.snx    Cumulative Combined solution. 
igs05P1313.sum  This file.
igs05P1313.itr  Residuals between the AC and the IGb00 for the RF stations. 
igs05P1313.res  Residuals between the AC and the Combined Weekly solution.
IGS05P10.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
     IGb00 stations at the current epoch.
     ftp://igscb.jpl.nasa.gov/igscb/station/coord/IGS03P33_RS99.SNX.Z
3-4) The AC are compared to IGb00, 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 IGb00 of the current
     epoch using a 7-parameters transformation. The singular cumulative
     combined solution is aligned to the IGb00 of the reference epoch
     using a 14-parameters transformation and the 99 ITRF station positions
     and velocities. The IGb00 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 = IGS03P33_RS99.SNX
     igs = igs05P1313.snx
     IGS = IGS05P10.snx

     MIT = mit13137.snx
     mit = mit1313g.snx

     BuA = IERS Bulletin A

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

     Solutions with manual station deletion:
         After unconstraining:
             jpl  ASPA

     4-1) Starting with GPS week 1143, the solutions are aligned to the
     IGS03P33_RS99.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            | 167 |  70 |        25.528 |         1.001 |        25.565 |
emr            |  45 |  33 |         4.686 |         1.001 |         4.693 |
esa            |  70 |  51 |         8.362 |         1.001 |         8.370 |
gfz            | 189 |  78 |         8.888 |         1.002 |         8.903 |
jpl            | 105 |  44 |         5.199 |         1.001 |         5.204 |
MIT            | 143 |  63 |         2.506 |         1.001 |         2.509 |
ngs            | 143 |  79 |        25.781 |         1.000 |        25.794 |
sio            | 178 |  77 |         2.585 |         1.001 |         2.587 |
mit            | 278 |  78 |         0.895 |         1.002 |         0.897 |
ncl            | 168 |  82 |         2.445 |         1.015 |         2.481 |
igs            | 258 |  83 |         1.439 |         1.010 |         1.454 |
---------------|-----|-----|---------------|---------------|---------------|

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

5-2-1)    With respect to the IGb00 stations:
=============================================

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod         70 |     0.5      0.2     -0.7 |     2.9      3.2     10.1 |
emr         33 |    -1.5     -0.2      0.2 |     3.3      3.1     12.2 |
esa         51 |    -1.9      0.7     -0.0 |     3.4      4.3     11.5 |
gfz         78 |     0.4     -0.1     -0.8 |     3.0      3.3      9.8 |
jpl         44 |    -1.8      0.2      0.0 |     2.7      3.5     10.5 |
MIT         63 |     0.9      0.2     -0.0 |     3.2      3.1     10.8 |
ngs         79 |    -2.0      0.6      0.5 |     4.8      5.2     12.5 |
sio         77 |    -0.1      0.4     -0.2 |     3.5      4.2      8.8 |
mit         78 |     0.3      0.2      0.0 |     2.9      3.0      8.8 |
ncl         82 |     0.5      0.1     -0.0 |     2.8      2.9      8.1 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        165 |    -0.1      0.3     -1.0 |     1.0      1.1      4.5 |
emr         45 |    -2.2     -0.5      0.4 |     2.0      2.0      6.2 |
esa         70 |    -2.3      0.2      0.9 |     2.2      3.2     12.1 |
gfz        185 |     0.0     -0.5     -0.3 |     0.8      1.5      3.8 |
jpl        104 |    -2.3      0.4      0.0 |     2.0      2.7      7.6 |
MIT        133 |     0.5     -0.3     -0.1 |     1.4      1.5      4.8 |
ngs        141 |    -2.3      0.4      0.6 |     2.9      4.3      7.7 |
sio        165 |     0.1      0.4      0.5 |     2.4      2.7      5.5 |
mit        249 |    -0.0      0.1      0.0 |     0.6      0.4      2.4 |
ncl        166 |     0.1     -0.2      0.7 |     0.8      0.6      2.6 |
ITR         82 |    -0.5     -0.1     -0.8 |     2.7      2.9      9.3 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        133 |     0.4      0.3     -1.4 |     2.0      2.5      7.6 |
emr         43 |    -2.1     -0.4     -0.4 |     2.6      2.5      8.6 |
esa         66 |    -2.3      0.4     -0.3 |     2.6      3.8     11.8 |
gfz        162 |     0.4     -0.4     -0.7 |     2.0      2.5      7.1 |
jpl         83 |    -1.8      0.1      0.3 |     2.2      3.0      8.4 |
MIT        114 |     0.8     -0.2     -0.5 |     2.1      2.4      7.3 |
ngs        132 |    -2.0      0.5      0.2 |     3.7      4.9     10.1 |
sio        146 |     0.3      0.6     -0.4 |     2.8      3.7      6.9 |
mit        179 |     0.3      0.2     -0.6 |     1.8      2.2      5.5 |
ncl        150 |     0.4     -0.1      0.2 |     1.8      2.1      5.4 |
igs        185 |     0.3      0.1     -0.5 |     1.7      2.0      5.6 |
ITR         86 |    -0.4      0.0     -0.7 |     1.4      1.4      4.3 |
---------------|---------------------------|---------------------------|

5-3)      7-Parameters Transformation: AC ----> IGS03P33_RS99.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            |  -0.018    0.025   -0.029     11.4      9.2     -4.6     3.15 |
emr            |   0.001   -0.000    0.017    -12.1      4.5    -13.0     4.49 |
esa            |   0.001   -0.007   -0.000     -5.7     11.4     -7.8     3.69 |
gfz            |   0.025   -0.015    0.007     -0.6      0.3     -4.0     2.31 |
jpl            |   0.133   -0.069    0.101     -7.0      6.3     -5.7     1.60 |
MIT            |   0.181   -0.072    0.009      7.1      4.0      3.3     3.47 |
ngs            |   0.048    0.185   -0.081     -1.9     14.3     44.7     3.64 |
sio            |  -0.113    0.037   -0.021      8.9      6.1     40.2     3.02 |
mit            |  -0.006    0.016   -0.011     -1.3     -0.9     -1.9     3.03 |
ncl            |   0.013   -0.047   -0.000      0.5      0.4     -3.1     2.64 |
---------------|---------------------------------------------------------------|

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            |   0.048    0.047    0.054      1.2      1.2      1.2     0.19 |
emr            |   0.067    0.068    0.079      1.8      1.8      1.8     0.28 |
esa            |   0.053    0.055    0.063      1.4      1.4      1.4     0.22 |
gfz            |   0.045    0.044    0.051      1.2      1.2      1.2     0.18 |
jpl            |   0.059    0.058    0.066      1.5      1.5      1.5     0.24 |
MIT            |   0.050    0.049    0.056      1.3      1.3      1.3     0.20 |
ngs            |   0.045    0.045    0.052      1.2      1.2      1.2     0.18 |
sio            |   0.046    0.045    0.052      1.2      1.2      1.2     0.18 |
mit            |   0.045    0.045    0.052      1.2      1.2      1.2     0.18 |
ncl            |   0.044    0.044    0.050      1.2      1.1      1.1     0.18 |
---------------|---------------------------------------------------------------|

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

               |      X        Y        Z  |    s X      s Y      s Z  |
               |    (mm)     (mm)     (mm) |    (mm)     (mm)     (mm) |
---------------|---------------------------|---------------------------|
igs            |     4.5      6.4     -0.6 |     3.2      3.2      4.3 |
---------------|---------------------------|---------------------------|

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            |     ---       17.8       1.0       ---      -5.0       --- |
emr            |     ---       28.3       1.3       4.1      -6.6       0.8 |
esa            |     ---       60.5       8.8       ---       9.5       --- |
gfz            |     ---       -7.6       2.8      -8.9       4.4       3.1 |
jpl            |     ---        9.5      -1.7     -29.2       2.0      -2.3 |
MIT            |     ---       20.7      -1.5       0.8      -1.1       0.0 |
ngs            |     ---       11.7     -13.3     -22.0       8.4     -30.8 |
sio            |     ---      -23.1      -7.3       0.1       6.6      -6.5 |
mit            |     ---       45.7      -5.3       0.3       1.7      -0.2 |
ncl            |     ---       19.5       2.2       ---       1.7       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       16.8      -4.4       0.1      26.8       2.7 |
---------------|------------------------------------------------------------|

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

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---        9.6       0.9       ---       1.5       --- |
emr            |     ---       11.7       2.5      12.3       1.8       3.9 |
esa            |     ---       50.8       3.8       ---       2.3       --- |
gfz            |     ---        8.5       2.0      15.8       2.2       5.8 |
jpl            |     ---       15.5       2.7      17.4       1.4       6.7 |
MIT            |     ---        5.3       1.0       6.5       1.4       7.5 |
ngs            |     ---        6.7       5.3      31.3       5.3      26.7 |
sio            |     ---        4.6       1.1       6.0       1.7       6.3 |
mit            |     ---        8.8       0.8       4.4       1.6       8.5 |
ncl            |     ---        2.8       1.2       ---       0.7       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       13.8       4.1       9.9       5.5      13.5 |
---------------|------------------------------------------------------------|

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

Thresholds set at 5 sigmas and 50 mm.

 Solution             Solution           |  Station   |    N       E       U  |
              Minus                      |code id soln|   (mm)    (mm)    (mm)|
-----------------------------------------|------------|-----------------------|
                                         |            |                       |
IGS03P33_RS99.snx    gfz13137.snx        |THU3  A ----|    3.1     1.1   -26.8|
                                         |            |                       |
IGS03P33_RS99.snx    jpl13137.snx        |GOUG  A ----|   17.2     5.5    77.6|
                                         |            |                       |
IGS03P33_RS99.snx    sio13137.snx        |GOUG  A ----|    4.9     3.9    65.4|
                                         |            |                       |
IGS03P33_RS99.snx    mit1313g.snx        |GOUG  A ----|    8.1     3.5    54.7|
                                         |            |                       |
IGS05P09.snx         jpl13137.snx        |YAKT  A ----|   -4.7    12.1    16.6|
                                         |            |                       |
IGS05P09.snx         igs05P1313.snx      |ALRT  A ----|    3.9    -6.4     3.5|
IGS05P09.snx         igs05P1313.snx      |MAG0  A ----|    4.8     9.6   -10.5|
-----------------------------------------|------------|-----------------------|

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

IERS DOMES NO    MIT    cod    emr    esa    gfz    jpl    ngs    sio    IGS    igs
============= ====== ====== ====== ====== ====== ====== ====== ====== ====== ======
    43001M002        THU2 A THU3 A THU3 A THU3 A        THU3 A THU2 A THU3 A THU3 A
                     THU3 A                                    THU3 A
    40451M123 GODE A GODZ A        GODE A GODE A        GODE A GODE A GODE A GODE A
    50103M108 TIDB A TIDB A TIDB A TIDB A TIDB A        TIDB A TID2 A TIDB A TIDB A
                                          TID1 A               TIDB A
                                          TID2 A 
    50134M002 DARR A 
    50134M001 DARW A DARR A               DARW A DARR A DARW A DARW A DARW A DARW A
                                                 DARW A
    22306M002        IISC A IISC A IISC B IISC A IISC A IISC B IISC A IISC A IISC A
    10422M001        KIR0 A                      KIR0 A                      KR0G A
    22003M001        PIMO A PIMO A PIMO B PIMO A PIMO A PIMO A PIMO A PIMO A PIMO A
 
MISSING IERS DOMES NOS AT MIT:
-----------------------------
  HLFX A  PALM A  PUR3 A  MIA3 A  KYW1 A  ELEN A  UPO1 A  OUSD A  MTJO A  HORN A
  CNCL A  QUAR A  KARA A  MAC1 B  MAR6 A  IENG A
 
MISSING IERS DOMES NOS AT gfz:
-----------------------------
  BISH A  PALM A
 
MISSING IERS DOMES NOS AT ngs:
-----------------------------
  CHUM A
 
MISSING IERS DOMES NOS AT sio:
-----------------------------
  KULU A  SG21 A  DOAR A  OUSD A  CNCL A  KARA A  MERS A  CAVA A  SFEL A  VOLT A
  BRAS A
IERS DOMES NO    mit    ncl    IGS    igs
============= ====== ====== ====== ======
    43001M002 THU2 A THU3 A THU3 A THU3 A
    40451M123 GODZ A GODE A GODE A GODE A
              GODE A 
    50103M108 TIDB A TID2 A TIDB A TIDB A
                     TIDB A
    50134M002 DARR A 
    50134M001 DARW A DARR A DARW A DARW A
                     DARW A
    33901M001 MBAR A MBAR A MBAR A MBAR A
 
MISSING IERS DOMES NOS AT mit:
-----------------------------
  MAC1 B  BISH A
--