Subject: [IGSREPORT-10851] Wk 1246 IGS SINEX Combination
From: Remi Ferland <[email-masked]>
To: [email-masked] (IGS Report Mailbox)
Cc: [email-masked] (gendt), [email-masked] (nisn)
Date: Thu, 11 Dec 2003 16:07:33 EST

******************************************************************************
IGS Electronic Report   11 Dec 13:07:37 PST 2003      Message Number 10851
******************************************************************************

Author:  R. Ferland , D. Hutchison

===================================================================
 Combined AC  solution for GPS week 1246 -  03/11/23 to 03/11/29
===================================================================

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

igs03P1246.snx  Combined weekly solution. 
igs03P1246.erp  Daily Earth Rotation Parameters.
igs00p02.erp    Daily Earth Rotation Parameters since GPS week 1013.
IGS03P48.snx    Cumulative Combined solution. 
igs03P1246.sum  This file.
igs03P1246.itr  Residuals between the AC and the IGS00 for the RF stations. 
igs03P1246.res  Residuals between the AC and the Combined Weekly solution.
IGS03P48.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 = igs03P1246.snx
     IGS = IGS03P48.snx

     BuA = IERS Bulletin A

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

     New cumulative solution for station BOGT started at GPS week 1244
     (Reprocessed).
     Solutions with manual station deletion:
         After unconstraining:
             ngs  KOKB

     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            | 161 |  35 |        30.758 |         1.000 |        30.755 |
emr            |  44 |  22 |         5.466 |         1.000 |         5.465 |
esa            |  62 |  42 |         6.863 |         1.000 |         6.863 |
gfz            | 174 |  40 |        10.639 |         1.000 |        10.638 |
jpl            | 103 |  28 |         5.059 |         1.000 |         5.059 |
ngs            |  73 |  41 |        26.471 |         1.000 |        26.470 |
sio            | 172 |  42 |         2.277 |         1.000 |         2.277 |
mit            | 248 |  41 |         1.968 |         1.000 |         1.968 |
igs            | 227 |  43 |         1.338 |         1.001 |         1.339 |
---------------|-----|-----|---------------|---------------|---------------|

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         35 |     0.7      0.3     -1.8 |     3.5      3.7     14.7 |
emr         22 |    -0.8      0.1      0.1 |     3.2      3.6      9.5 |
esa         42 |    -1.3      0.4     -0.0 |     3.8      4.5     12.3 |
gfz         40 |     0.5      0.3     -0.5 |     3.5      4.0     10.1 |
jpl         28 |    -0.9      0.0      0.1 |     3.8      3.4      7.8 |
ngs         41 |    -1.2      0.8     -0.5 |     5.1      6.2     12.5 |
sio         42 |     0.1      0.5     -0.1 |     3.8      4.0      9.2 |
mit         41 |     0.8     -0.2     -0.2 |     3.4      4.0     10.5 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        158 |     0.4      0.3     -1.4 |     1.2      1.4      8.7 |
emr         43 |    -0.8      0.8     -0.9 |     1.8      1.9      6.9 |
esa         62 |    -2.2      0.2      0.5 |     2.7      2.7     12.9 |
gfz        168 |    -0.0     -0.1     -0.4 |     0.9      1.3      4.5 |
jpl        101 |    -1.4      0.1     -0.0 |     1.4      1.5      6.5 |
ngs         72 |    -2.5      1.1      0.2 |     4.0      5.0      9.9 |
sio        161 |     0.0      0.1     -0.3 |     1.5      2.2      4.9 |
mit        218 |     0.2     -0.0     -0.6 |     1.0      0.9      3.7 |
ITR         42 |    -0.2     -0.4     -0.0 |     3.2      3.4      8.4 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        130 |     1.0     -0.2     -1.2 |     2.6      2.1     13.3 |
emr         41 |    -0.3      0.5     -0.6 |     2.8      2.7      8.4 |
esa         61 |    -2.0     -0.2      1.1 |     3.1      3.7     15.0 |
gfz        158 |     0.1     -0.5      0.3 |     2.6      2.4      8.7 |
jpl         92 |    -0.9     -0.2      1.4 |     2.6      2.6      9.0 |
ngs         72 |    -2.1      0.9      0.3 |     4.2      5.5     12.8 |
sio        147 |     0.3     -0.1     -0.4 |     2.7      3.1      9.0 |
mit        175 |     0.4     -1.0     -0.3 |     2.3      2.5      7.7 |
igs        177 |     0.1     -0.4     -0.1 |     1.9      2.2      7.1 |
ITR         54 |    -0.6     -0.7      0.2 |     2.8      2.5      4.7 |
---------------|---------------------------|---------------------------|

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            |   0.016   -0.004   -0.019      9.5     12.9     -4.1     1.44 |
emr            |   0.027    0.003   -0.019     -1.2     13.0    -16.8     2.94 |
esa            |  -0.023   -0.072    0.013      0.8      6.5     -0.6     1.01 |
gfz            |   0.049   -0.030    0.071     -1.4      1.8     -3.4     1.10 |
jpl            |   0.011    0.006    0.040     -2.2      8.5     -6.9     0.43 |
ngs            |   0.087   -0.061   -0.084     -3.6      3.5    -28.6     1.57 |
sio            |   0.030   -0.062    0.057     10.1      0.8     41.8     1.93 |
mit            |  -0.023   -0.019    0.010     -1.2     -1.1     -1.8     1.74 |
---------------|---------------------------------------------------------------|

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            |   0.066    0.067    0.076      1.7      1.7      1.7     0.27 |
emr            |   0.084    0.082    0.098      2.2      2.2      2.2     0.34 |
esa            |   0.060    0.061    0.071      1.6      1.6      1.6     0.25 |
gfz            |   0.061    0.062    0.071      1.6      1.6      1.6     0.25 |
jpl            |   0.076    0.072    0.086      1.9      1.9      1.9     0.30 |
ngs            |   0.060    0.062    0.071      1.6      1.6      1.6     0.25 |
sio            |   0.060    0.061    0.071      1.6      1.6      1.6     0.25 |
mit            |   0.060    0.061    0.072      1.6      1.6      1.6     0.25 |
---------------|---------------------------------------------------------------|

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

               |      X        Y        Z  |    s X      s Y      s Z  |
               |    (mm)     (mm)     (mm) |    (mm)     (mm)     (mm) |
---------------|---------------------------|---------------------------|
igs            |     1.9      7.8     -4.0 |     1.8      2.1      4.6 |
---------------|---------------------------|---------------------------|

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            |     ---       -4.8      -0.1       ---       1.0       --- |
emr            |     ---       56.1      -3.9     -10.1      -0.3      -9.3 |
esa            |     ---       -4.0      -3.5       ---       7.4       --- |
gfz            |     ---       -2.3       0.4       1.7      -3.1      -0.3 |
jpl            |     ---       -8.0      -1.7     -11.2       4.8      -4.4 |
ngs            |     ---       -4.0       8.6       ---     -16.7       --- |
sio            |     ---        5.4       4.4       9.6       3.7       5.3 |
mit            |     ---       15.0       2.4      10.1       6.0       3.3 |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---      -11.6      -3.6       9.6      27.1      -1.5 |
---------------|------------------------------------------------------------|

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

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---        7.7       2.2       ---       2.3       --- |
emr            |     ---       10.1       2.9      10.6       3.9      12.5 |
esa            |     ---       14.1       4.1       ---       3.4       --- |
gfz            |     ---        6.2       1.8       4.9       1.5       3.3 |
jpl            |     ---       42.7       3.1       5.4       2.6      10.2 |
ngs            |     ---       12.4       5.9       ---       7.4       --- |
sio            |     ---       15.4       2.2       7.6       2.7       6.8 |
mit            |     ---        6.3       3.6       7.6       2.2      13.4 |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       12.7       8.2      16.3       4.5      15.3 |
---------------|------------------------------------------------------------|

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

Thresholds set at 5 sigmas and 50 mm.

 Solution             Solution           |  Station   |    N       E       U  |
              Minus                      |code id soln|   (mm)    (mm)    (mm)|
-----------------------------------------|------------|-----------------------|
                                         |            |                       |
cod12467.snx         jpl12467.snx        |DWH1  A ----|   -0.1    -2.4   -63.9|
                                         |            |                       |
IGS03P47.snx         esa12467.snx        |GOL2  A ----|   12.1    57.7     1.1|
                                         |            |                       |
IGS03P47.snx         gfz12467.snx        |OBET  A ----|    0.0    -1.8   -57.8|
                                         |            |                       |
IGS03P47.snx         ngs12467.snx        |BOGT  A    3|    3.4    -2.8   -53.4|
                                         |            |                       |
IGS03P47.snx         mit1246g.snx        |UPO1  A ----|    3.7     8.1   115.2|
                                         |            |                       |
IGS03P47.snx         mit1246g.snx        |OBET  A ----|   -0.0    -1.7   -60.1|
                                         |            |                       |
IGS03P47.snx         igs03P1246.snx      |MAG0  A ----|   11.4     5.9     6.9|
IGS03P47.snx         igs03P1246.snx      |YAKT  A ----|   -1.2     0.5    29.7|
IGS03P47.snx         igs03P1246.snx      |YSSK  A ----|   11.7    -3.7     9.3|
-----------------------------------------|------------|-----------------------|

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

IERS DOMES NO    cod    emr    esa    gfz    jpl    ngs    sio    IGS    igs
============= ====== ====== ====== ====== ====== ====== ====== ====== ======
    50134M001 DARR A               DARW A DARW A DARW A DARW A DARW A DARW A
    66010M001 DAV1 A        DAV1 A DAV1 A DAV1 A DAV1 A DAV1 A DAV1 A DAV1 A
              DAVR A                                                  DAVR A
    40405S031 GOLD A        GOL2 A GOLD A        GOL2 A GOL2 A GOLD A GOLD A
                            GOLD A
    22306M002 IISC A        IISC B IISC A IISC A IISC B IISC A IISC A IISC A
    10422M001 KIR0 A                                                  KR0G A
    30314M002 SUTH A        SUTH B SUTH A        SUTH A SUTH A SUTH A SUTH A
    43001M002 THU2 A               THU3 A        THU3 A THU2 A THU3 A THU3 A
    50103M108 TIDB A        TID2 A TIDB A TIDB A TID2 A TIDB A TIDB A TIDB A
                            TIDB A TID2 A               TID2 A
    50107M004 YAR2 A               YAR2 A        YAR2 A YAR2 A YAR1 A YAR2 A
                                                               YAR2 A 
    13407S012                      MADR A MAD2 A        MAD2 A MADR A MADR A
                                                        MADR A
    40460M004                      SIO3 A                      SIO3 A SIO3 A
 
MISSING IERS DOMES NOS AT gfz:
-----------------------------
  BISH A  PMON A  PALM A
 
MISSING IERS DOMES NOS AT sio:
-----------------------------
  PUR2 A  CONZ A  OUSD A  CNCL A  KARA A  CAVA A  SFEL A  VOLT A  BRAS A
IERS DOMES NO    mit    IGS    igs
============= ====== ====== ======
    13407S012 MAD2 A MADR A MADR A
              MADR A
    43001M002 THU2 A THU3 A THU3 A
              THU3 A
    40405S031 GOLD A GOLD A GOLD A
              GOL2 A
    50103M108 TIDB A TIDB A TIDB A
              TID2 A
              TID1 A
    50134M001 DARR A DARW A DARW A
              DARW A
    50107M004 YAR2 A YAR1 A YAR2 A
                     YAR2 A 
    66010M001 DAV1 A DAV1 A DAV1 A
              DAVR A        DAVR A
    10422M001 KIR0 A        KR0G A
    30307M001 SIMO A        SIMO A
 
MISSING IERS DOMES NOS AT mit:
-----------------------------
  PMON A  BISH A
--
--