Subject: [IGSREPORT-10994] Wk 1253 IGS SINEX Combination
From: Remi Ferland <[email-masked]>
To: [email-masked] (IGS Report Mailbox)
Cc: [email-masked] (gendt), [email-masked] (nisn)
Date: Thu, 29 Jan 2004 21:00:04 EST

******************************************************************************
IGS Electronic Report   29 Jan 18:00:09 PST 2004      Message Number 10994
******************************************************************************

Author:  R. Ferland , D. Hutchison

===================================================================
 Combined AC  solution for GPS week 1253 -  04/01/11 to 04/01/17
===================================================================

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

igs04P1253.snx  Combined weekly solution. 
igs04P1253.erp  Daily Earth Rotation Parameters.
igs00p02.erp    Daily Earth Rotation Parameters since GPS week 1013.
IGS04P02.snx    Cumulative Combined solution. 
igs04P1253.sum  This file.
igs04P1253.itr  Residuals between the AC and the IGb00 for the RF stations. 
igs04P1253.res  Residuals between the AC and the Combined Weekly solution.
IGS04P02.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 = igs04P1253.snx
     IGS = IGS04P02.snx

     MIT = mit12537.snx
     mit = mit1253g.snx

     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:
	     ITR  FAIR  JOZE  YSSK
         After unconstraining:
             ngs  GUAM  KOKB

     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.

     4-3) Starting with this week combination the weekly and the
     cumulative solutions are aligned to the updated IGS realization of
     ITRF2000 (IGb00). It replaces the IGS00 realization which has been
     used between GPS weeks 1143 and 1252 inclusively. Although both
     are realizations of ITRF2000, the IGb00 includes more stations,
     and has more recent data. The transformation parameters between
     the IGS00 and the IGb00 realization of ITRF2000 can be found in
     the table below:
     
     Transformation from IGb00 to IGS00 at epoch 01-JAN-1998:
     ====================================================================
              TX     TY     TZ    RX      RY      RZ       D
              mm     mm     mm    mas     mas     mas     ppb
     Offset  -0.1    0.2    0.2  0.001   0.004  -0.006   0.116
     +/-      0.5    0.5    0.5   .017    .018    .020    .07
     --------------------------------------------------------------------
             dTX    dTY    dTZ    dRX     dRY     dRZ     dD
             mm/y   mm/y   mm/y   mas/y   mas/y   mas/y   ppb/y
     Drift    0.0   -0.2   -0.1  -.004  -0.005   0.000  -0.056
     +/-      0.5    0.5    0.5   .017    .018    .020    .07
     --------------------------------------------------------------------
     * The IERS convention for the transformation parameters was followed.

     The accumulated erp file "igs00p02.erp" will also be aligned to the
     "IGS realization of ITRF2000".

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            | 162 |  79 |        28.476 |         0.997 |        28.379 |
emr            |  49 |  31 |         5.161 |         1.001 |         5.168 |
esa            |  70 |  62 |         7.304 |         0.839 |         6.128 |
gfz            | 178 |  89 |         8.377 |         1.018 |         8.529 |
jpl            | 113 |  61 |         4.982 |         1.012 |         5.042 |
MIT            | 142 |  75 |         3.255 |         1.002 |         3.261 |
ngs            |  83 |  83 |        25.409 |         1.006 |        25.552 |
sio            | 170 |  88 |         2.252 |         1.000 |         2.253 |
mit            | 261 |  88 |         1.587 |         1.032 |         1.637 |
ncl            | 156 |  91 |         3.324 |         0.984 |         3.271 |
igs            | 244 |  91 |         1.467 |         1.021 |         1.497 |
---------------|-----|-----|---------------|---------------|---------------|

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         79 |     1.1     -0.0     -1.3 |     2.9      2.4     12.6 |
emr         31 |     0.7     -0.2      1.0 |     3.4      3.0     11.0 |
esa         62 |    -2.6     -0.1      0.1 |     2.7      2.5     11.7 |
gfz         89 |     0.2     -0.2     -0.8 |     2.7      2.9      9.4 |
jpl         61 |    -1.0     -0.2      0.3 |     3.0      2.7     10.0 |
MIT         75 |     0.6      0.1      0.4 |     2.8      2.7      9.2 |
ngs         82 |    -1.1      0.6     -0.9 |     4.1      5.3     12.3 |
sio         88 |     0.2      0.3     -0.7 |     3.5      3.6      7.3 |
mit         88 |     0.4      0.1     -0.3 |     2.6      2.3      7.9 |
ncl         91 |     0.7      0.0      0.0 |     2.6      2.3      7.9 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        159 |     0.4      0.2     -0.9 |     1.4      1.5      6.8 |
emr         48 |    -0.1      0.3      1.2 |     2.3      2.1      6.5 |
esa         70 |    -2.7      0.1     -0.8 |     2.0      2.0      9.6 |
gfz        173 |    -0.7     -0.4     -0.7 |     1.4      1.6      4.7 |
jpl        111 |    -1.2     -0.3     -0.6 |     1.9      1.6      7.2 |
MIT        130 |     0.5      0.4     -0.1 |     1.6      1.7      5.2 |
ngs         81 |    -1.3      0.4     -0.2 |     4.1      4.7     10.7 |
sio        158 |     0.0      0.3      0.2 |     2.2      2.7      4.8 |
mit        234 |    -0.0      0.1      0.0 |     0.6      0.7      2.4 |
ncl        153 |     0.1      0.1      0.1 |     0.9      0.7      2.8 |
ITR         90 |    -0.3      0.1      0.1 |     2.1      2.0      7.9 |
---------------|---------------------------|---------------------------|

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     -1.7 |     2.6      2.3     11.8 |
emr         44 |     0.4     -0.0      1.4 |     3.2      3.2      9.4 |
esa         69 |    -2.7     -0.2     -1.2 |     2.6      2.5     12.0 |
gfz        161 |    -0.2     -0.6     -1.3 |     2.7      2.8      9.0 |
jpl         97 |    -1.0     -0.5     -0.1 |     3.1      2.7      9.0 |
MIT        119 |     0.8      0.3     -1.0 |     2.6      2.5      9.1 |
ngs         83 |    -1.1      0.7     -0.4 |     4.0      5.2     12.2 |
sio        145 |     0.6      0.3     -0.5 |     3.3      3.4      7.5 |
mit        180 |     0.5      0.1     -0.9 |     2.4      2.1      7.8 |
ncl        146 |     0.8      0.0     -0.7 |     2.3      2.1      7.9 |
igs        183 |     0.4     -0.1     -0.8 |     2.1      2.0      7.2 |
ITR         96 |    -0.2      0.0     -0.2 |     0.5      0.5      1.5 |
---------------|---------------------------|---------------------------|

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            |   0.010    0.049   -0.013      7.4     14.2      5.9     1.98 |
emr            |  -0.008   -0.039    0.014      3.5     13.0     -0.1     3.13 |
esa            |   0.005    0.025   -0.013     -1.8     12.0      0.2     2.50 |
gfz            |   0.053    0.036    0.054     -1.1      2.9     -3.3     1.51 |
jpl            |   0.031    0.018    0.014     -2.3      8.4     -1.9     1.12 |
MIT            |   0.128    0.050   -0.069      0.0      5.6     21.5     2.87 |
ngs            |  -0.042    0.085   -0.067      2.6     12.7     39.0     1.40 |
sio            |   0.072   -0.061    0.069      7.3      5.4     36.8     2.63 |
mit            |   0.007    0.015   -0.002     -0.7     -0.5     -1.2     2.28 |
ncl            |   0.017   -0.016   -0.043      1.2      2.5     -2.1     2.41 |
---------------|---------------------------------------------------------------|

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            |   0.045    0.045    0.050      1.2      1.2      1.2     0.18 |
emr            |   0.068    0.074    0.081      1.8      1.8      1.8     0.28 |
esa            |   0.050    0.050    0.054      1.3      1.3      1.3     0.20 |
gfz            |   0.042    0.042    0.047      1.1      1.1      1.1     0.17 |
jpl            |   0.050    0.050    0.056      1.3      1.3      1.3     0.20 |
MIT            |   0.046    0.046    0.051      1.2      1.2      1.2     0.19 |
ngs            |   0.044    0.044    0.050      1.2      1.1      1.1     0.18 |
sio            |   0.042    0.043    0.048      1.1      1.1      1.1     0.17 |
mit            |   0.042    0.043    0.048      1.1      1.1      1.1     0.17 |
ncl            |   0.042    0.042    0.047      1.1      1.1      1.1     0.17 |
---------------|---------------------------------------------------------------|

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

               |      X        Y        Z  |    s X      s Y      s Z  |
               |    (mm)     (mm)     (mm) |    (mm)     (mm)     (mm) |
---------------|---------------------------|---------------------------|
igs            |    -0.7      6.4      9.8 |     1.8      1.9      4.1 |
---------------|---------------------------|---------------------------|

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            |     ---        2.7      -4.4       ---      -5.5       --- |
emr            |     ---       13.4      -2.8      16.7      -7.4     -14.3 |
esa            |     ---        7.0      -1.2       ---       0.1       --- |
gfz            |     ---       -4.3       5.2       1.8       3.0      12.2 |
jpl            |     ---       26.1      -0.9      17.9      -1.2      12.0 |
MIT            |     ---        3.3      -1.7      -0.2      -4.1      -0.3 |
ngs            |     ---       32.4      25.3       ---      14.2       --- |
sio            |     ---       -8.8       2.2       1.2       8.5      -1.6 |
mit            |     ---       30.2      -1.5      -0.2      -2.7      -0.0 |
ncl            |     ---       10.8       1.8       ---       3.9       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---        7.1      -6.8      -1.3      25.7       1.1 |
---------------|------------------------------------------------------------|

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

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---        9.8       1.1       ---       1.4       --- |
emr            |     ---        7.9       2.7      13.0       4.9      22.7 |
esa            |     ---        7.6       3.9       ---       3.5       --- |
gfz            |     ---        3.9       6.4       6.7       3.4       8.0 |
jpl            |     ---       17.1       2.2       6.0       1.3      10.4 |
MIT            |     ---        6.4       2.4       4.5       1.8       6.6 |
ngs            |     ---       26.2       8.1       ---      16.0       --- |
sio            |     ---        4.7       1.2       7.6       2.4       9.0 |
mit            |     ---        5.0       2.3       4.7       2.1       4.5 |
ncl            |     ---        3.3       0.8       ---       1.3       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       13.7       9.0      18.3       6.1      10.5 |
---------------|------------------------------------------------------------|

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    ngs12537.snx        |YAKT  A ----|    7.7    -9.6    54.1|
                                         |            |                       |
cod12537.snx         esa12537.snx        |FAIR  A    2|   -7.8     0.7   -50.3|
                                         |            |                       |
cod12537.snx         jpl12537.snx        |DWH1  A ----|   -3.2    -5.2   -56.3|
                                         |            |                       |
esa12537.snx         MIT12537.snx        |FAIR  A    2|    4.6     1.3    52.8|
                                         |            |                       |
esa12537.snx         ngs12537.snx        |UNSA  A ----|   -5.4     7.1    56.7|
                                         |            |                       |
gfz12537.snx         ngs12537.snx        |UNSA  A ----|   -2.3     6.1    56.6|
                                         |            |                       |
IGS04P01.snx         sio12537.snx        |KIRU  A ----|   -7.3     1.2   -35.6|
                                         |            |                       |
IGS04P01.snx         mit1253g.snx        |OBET  A ----|    1.6    -0.6   -57.9|
                                         |            |                       |
IGS04P01.snx         igs04P1253.snx      |MAG0  A ----|    8.5     5.7     2.1|
IGS04P01.snx         igs04P1253.snx      |YSSK  A ----|   10.1    -4.6    10.0|
-----------------------------------------|------------|-----------------------|

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

IERS DOMES NO    UNK    cod    emr    esa    gfz    jpl    ngs    sio    IGS    igs
============= ====== ====== ====== ====== ====== ====== ====== ====== ====== ======
    22306M002 IISC A IISC A IISC A IISC B IISC A IISC A IISC B IISC A IISC A IISC A
    50134M001 DARR A DARR A        DARW A DARW 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 DAV1 A DAV1 A
              DAVR A DAVR A                                                  DAVR A
    40451M123 GODE A GODE A        GODE A GODE A GODZ A GODE A GODE A GODE A GODE A
                                                                             GODZ A
    40405S031 GOL2 A GOLD A GOL2 A GOLD A GOLD A        GOLD B GOL2 A GOLD A GOLD A
    13407S012 MAD2 A                      MADR A MAD2 A        MAD2 A MADR A MADR A
                                                               MADR A
    43001M002 THU3 A THU2 A               THU3 A        THU3 A THU2 A THU3 A THU3 A
    50103M108 TID1 A               TIDB A TIDB A TID2 A TIDB A TID2 A TIDB A TIDB A
              TID2 A                      TID2 A TIDB A        TIDB A
              TIDB A 
    50107M004 YAR2 A YAR2 A               YAR2 A               YAR2 A YAR1 A YAR2 A
                                                                      YAR2 A 
    10422M001        KIR0 A                                                  KR0G A
    22003M001        PIMO A PIMO A PIMO B PIMO A PIMO A        PIMO A PIMO A PIMO A
    12741M001                             VENE A               VENE A VENE A VENE A
 
MISSING IERS DOMES NOS AT UNK:
-----------------------------
  ASPA A  CNCL A  HORN A  KARA A  KYW1 A  MIA3 A  MTJO A  NETT A  OUSD A  PALM A
  PUR2 A  PUR3 A  QUAR A  SAMP A  UPO1 A  KAYT A
 
MISSING IERS DOMES NOS AT gfz:
-----------------------------
  BISH A  PALM A
 
MISSING IERS DOMES NOS AT sio:
-----------------------------
  PUR2 A  CONZ A  OUSD A  CNCL A  KARA A  MERS A  CAVA A  SFEL A  VOLT A  BRAS A

MISSING IERS DOMES NOS AT igs:
-----------------------------
  KAYT A  HORN A  NETT A
IERS DOMES NO    mit    ncl    IGS    igs
============= ====== ====== ====== ======
    13407S012 MADR A MAD2 A MADR A MADR A
    31303M001 MAS1 A 
    31303M002        MAS1 A MAS1 A MAS1 A
    43001M002 THU2 A THU3 A THU3 A THU3 A
    40451M123 GODE A GODE A GODE A GODE A
              GODZ A               GODZ A
    40405S031 GOLD A GOL2 A GOLD A GOLD A
                     GOLD A
    50103M108 TIDB A TID2 A TIDB A TIDB A
                     TIDB A
    66010M001 DAV1 A DAV1 A DAV1 A DAV1 A
                                   DAVR A
    10422M001 KIR0 A               KR0G A
    12717M004        NOT1 A NOT1 A NOT1 A
 
MISSING IERS DOMES NOS AT mit:
-----------------------------
  BISH A
 
MISSING IERS DOMES NOS AT igs:
-----------------------------
  KAYT A  HORN A  NETT A
--