Subject: [IGSREPORT-11057] Wk 1256 IGS SINEX Combination
From: Remi Ferland <[email-masked]>
To: [email-masked] (IGS Report Mailbox)
Cc: [email-masked] (gendt), [email-masked] (nisn)
Date: Thu, 19 Feb 2004 18:49:31 EST

******************************************************************************
IGS Electronic Report   19 Feb 15:49:37 PST 2004      Message Number 11057
******************************************************************************

Author:  R. Ferland , D. Hutchison

===================================================================
 Combined AC  solution for GPS week 1256 -  04/02/01 to 04/02/07
===================================================================

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

igs04P1256.snx  Combined weekly solution. 
igs04P1256.erp  Daily Earth Rotation Parameters.
igs00p02.erp    Daily Earth Rotation Parameters since GPS week 1013.
IGS04P05.snx    Cumulative Combined solution. 
igs04P1256.sum  This file.
igs04P1256.itr  Residuals between the AC and the IGb00 for the RF stations. 
igs04P1256.res  Residuals between the AC and the Combined Weekly solution.
IGS04P05.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 = igs04P1256.snx
     IGS = IGS04P05.snx

     MIT = mit12567.snx
     mit = mit1256g.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

     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            | 161 |  79 |        30.375 |         1.000 |        30.372 |
emr            |  45 |  30 |         5.878 |         1.000 |         5.878 |
esa            |  69 |  59 |         8.875 |         1.000 |         8.875 |
gfz            | 174 |  87 |         8.426 |         1.000 |         8.426 |
jpl            | 106 |  59 |         5.732 |         1.000 |         5.732 |
MIT            | 144 |  70 |         3.275 |         1.000 |         3.274 |
ngs            |  79 |  80 |        30.173 |         1.000 |        30.172 |
sio            | 169 |  87 |         2.189 |         1.000 |         2.189 |
mit            | 261 |  89 |         1.602 |         1.000 |         1.602 |
ncl            | 157 |  89 |         3.191 |         1.021 |         3.257 |
igs            | 241 |  93 |         1.741 |         0.999 |         1.740 |
---------------|-----|-----|---------------|---------------|---------------|

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 |     0.3     -0.0     -0.6 |     2.6      2.5     11.0 |
emr         30 |     0.6      0.0      1.1 |     2.8      2.7     10.3 |
esa         59 |    -2.8      0.2      0.8 |     4.2      3.3     12.6 |
gfz         87 |     0.9     -0.1     -0.3 |     3.0      3.1      8.0 |
jpl         59 |    -0.1      0.1      0.3 |     2.8      2.6      9.9 |
MIT         70 |     0.1      0.0      0.7 |     2.8      2.9      9.8 |
ngs         78 |    -1.5     -0.3     -0.5 |     5.1      6.4     13.7 |
sio         87 |    -0.5      0.4     -0.0 |     2.9      3.0      7.4 |
mit         89 |     0.6     -0.1     -0.1 |     2.8      2.3      7.7 |
ncl         89 |     0.6     -0.1      0.4 |     2.7      2.4      7.6 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        160 |    -0.3      0.1      0.7 |     1.1      1.1      7.4 |
emr         45 |     0.3     -0.5      1.0 |     2.0      1.5      6.8 |
esa         69 |    -2.9      0.1      0.5 |     3.2      2.1     11.2 |
gfz        171 |     0.2     -0.3     -0.4 |     1.3      1.6      4.2 |
jpl        105 |    -0.7     -0.4      0.1 |     1.8      1.3      7.1 |
MIT        132 |     0.2     -0.0      0.1 |     1.5      2.0      5.0 |
ngs         79 |    -2.1     -0.3      0.1 |     3.9      5.4     11.6 |
sio        158 |    -0.7      0.4      1.0 |     1.5      1.9      3.4 |
mit        232 |     0.1     -0.0     -0.4 |     0.6      0.8      3.5 |
ncl        156 |     0.1      0.0      0.6 |     0.6      0.5      2.7 |
ITR         92 |    -0.5      0.2      0.0 |     2.3      2.4      7.2 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        131 |     0.0     -0.3     -0.3 |     2.4      2.5     10.9 |
emr         43 |     0.3     -0.7      0.4 |     2.5      2.9      9.8 |
esa         68 |    -2.8      0.0     -0.6 |     4.0      3.2     13.6 |
gfz        158 |     0.3     -0.4     -1.1 |     2.8      2.8      8.2 |
jpl         95 |    -0.5     -0.6     -0.5 |     2.6      2.9      9.4 |
MIT        113 |     0.3     -0.2     -0.9 |     2.6      2.5      8.9 |
ngs         79 |    -1.6     -0.3     -0.1 |     4.9      6.4     13.5 |
sio        145 |    -0.4      0.2      0.6 |     2.6      3.0      7.0 |
mit        179 |     0.5     -0.5     -1.0 |     3.0      2.5      7.6 |
ncl        146 |     0.4     -0.3     -0.4 |     2.3      2.3      7.5 |
igs        184 |     0.2     -0.2     -0.7 |     2.2      2.3      6.9 |
ITR         96 |    -0.2      0.0     -0.2 |     0.6      0.5      1.6 |
---------------|---------------------------|---------------------------|

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    0.038   -0.002      7.2     14.0    -31.3     1.64 |
emr            |  -0.003   -0.013    0.034      2.5      8.9    -10.5     3.51 |
esa            |   0.027    0.025   -0.021      3.1     13.1     -0.4     2.39 |
gfz            |   0.050    0.011    0.044     -0.2      3.1     -2.6     1.74 |
jpl            |   0.056    0.001    0.071      5.1      5.7    -10.1     1.23 |
MIT            |   0.198    0.032   -0.008     -1.3      7.1      9.3     4.13 |
ngs            |   0.181    0.073   -0.081     -8.4     21.0      0.6     1.80 |
sio            |   0.166   -0.109    0.077     10.3      9.8     34.3     2.44 |
mit            |  -0.000    0.001   -0.003      0.0     -0.1     -1.2     2.63 |
ncl            |   0.009   -0.058   -0.046      2.4      2.7     -6.1     2.67 |
---------------|---------------------------------------------------------------|

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            |   0.046    0.046    0.050      1.2      1.2      1.2     0.18 |
emr            |   0.070    0.072    0.085      1.9      1.9      1.9     0.29 |
esa            |   0.051    0.051    0.056      1.3      1.3      1.3     0.21 |
gfz            |   0.043    0.043    0.048      1.1      1.1      1.1     0.17 |
jpl            |   0.051    0.051    0.057      1.3      1.3      1.3     0.21 |
MIT            |   0.047    0.048    0.053      1.2      1.2      1.2     0.19 |
ngs            |   0.046    0.045    0.052      1.2      1.2      1.2     0.18 |
sio            |   0.043    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            |   0.043    0.043    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            |    -0.1     11.9     -7.0 |     2.1      2.4      5.4 |
---------------|---------------------------|---------------------------|

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            |     ---        8.7       1.0       ---      -5.2       --- |
emr            |     ---       21.5      -1.9      -3.3      -5.6       4.4 |
esa            |     ---       27.2       2.4       ---      -3.4       --- |
gfz            |     ---       -9.3       1.6     -28.6       7.3      -1.0 |
jpl            |     ---        1.3      -3.1     -22.1      -3.1       1.1 |
MIT            |     ---        4.8      -0.7       2.0       1.2      -0.2 |
ngs            |     ---      -21.1       9.3       ---      32.4       --- |
sio            |     ---       -9.5      -4.8       2.5      -1.5      -2.3 |
mit            |     ---       14.5      -2.0       2.4       3.1      -0.5 |
ncl            |     ---        8.9       7.5       ---       5.7       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       20.7      -7.4       0.9      27.2      -0.3 |
---------------|------------------------------------------------------------|

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

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---        5.2       0.9       ---       2.6       --- |
emr            |     ---        4.1       3.2      15.3       2.8      15.4 |
esa            |     ---        7.5       3.1       ---       2.5       --- |
gfz            |     ---        9.0       3.1      13.3       3.5       9.1 |
jpl            |     ---       62.8       2.8      33.6       2.2      11.0 |
MIT            |     ---        6.7       4.3       5.4       2.0       4.5 |
ngs            |     ---       22.3       9.2       ---       5.2       --- |
sio            |     ---        5.5       1.7       4.4       3.2       6.0 |
mit            |     ---        8.0       4.1       3.7       2.3       3.2 |
ncl            |     ---        3.7       1.9       ---       1.2       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       10.2       3.7       6.8       3.1       6.6 |
---------------|------------------------------------------------------------|

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    ngs12567.snx        |UNSA  A ----|   -4.7     0.2    52.4|
                                         |            |                       |
cod12567.snx         jpl12567.snx        |ASPA  A ----|   -5.9    -0.3   -51.7|
cod12567.snx         jpl12567.snx        |DWH1  A ----|    1.0    -0.3   -51.3|
                                         |            |                       |
                                         |            |                       |
esa12567.snx         MIT12567.snx        |FAIR  A    2|    9.9     6.0    53.0|
                                         |            |                       |
esa12567.snx         ngs12567.snx        |MKEA  A ----|    4.2    10.0    53.5|
                                         |            |                       |
gfz12567.snx         ngs12567.snx        |SANT  A ----|    2.9     5.3    52.7|
                                         |            |                       |
                                         |            |                       |
jpl12567.snx         ngs12567.snx        |SANT  A ----|    3.2    10.2    57.0|
                                         |            |                       |
jpl12567.snx         sio12567.snx        |ASPA  A ----|    4.1    -4.1    54.3|
                                         |            |                       |
jpl12567.snx         ncl1256g.snx        |ASPA  A ----|    4.8    -0.5    53.1|
                                         |            |                       |
                                         |            |                       |
IGS04P04.snx         gfz12567.snx        |FAIR  A    2|   -3.9   -12.3     2.6|
IGS04P04.snx         gfz12567.snx        |HNPT  A ----|   21.4    -2.7    -5.0|
IGS04P04.snx         gfz12567.snx        |OBET  A ----|    2.0    -2.3   -46.6|
                                         |            |                       |
IGS04P04.snx         sio12567.snx        |KIRU  A ----|   -2.3     2.3   -33.2|
IGS04P04.snx         sio12567.snx        |WHIT  A ----|    3.0    -0.6   -27.4|
                                         |            |                       |
IGS04P04.snx         mit1256g.snx        |OBET  A ----|    2.3    -1.8   -50.2|
-----------------------------------------|------------|-----------------------|

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

IERS DOMES NO    MIT    cod    emr    esa    gfz    jpl    ngs    sio    IGS    igs
============= ====== ====== ====== ====== ====== ====== ====== ====== ====== ======
    13407S012 MAD2 A                      MADR A MAD2 A        MAD2 A MADR A MADR A
                                                               MADR A
    43001M002 THU3 A THU2 A        THU3 A THU3 A        THU3 A THU2 A THU3 A THU3 A
    40405S031 GOL2 A GOLD A GOL2 A GOLD A GOLD A        GOLD B GOL2 A GOLD A GOLD A
    50103M108 TID1 A TIDB A        TIDB A TIDB A TIDB A TIDB A TID2 A TIDB A TIDB A
              TID2 A                      TID2 A               TIDB A
              TIDB A 
    50134M001 DARR A DARR A               DARW A DARW A DARW A DARW A DARW A DARW A
              DARW A 
    50107M004 YAR2 A                      YAR2 A               YAR2 A YAR1 A YAR2 A
                                                                      YAR2 A 
    12313M002 MDVJ A IRKJ A                      IRKJ 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
    22306M002        IISC A IISC A IISC B IISC A IISC A IISC B IISC A IISC A IISC A
    10422M001        KIR0 A                                                  KR0G A
    22003M001        PIMO A PIMO A PIMO B PIMO A PIMO A        PIMO A PIMO A PIMO A
    13102M001                      REDU A                                    REDU A
 
MISSING IERS DOMES NOS AT MIT:
-----------------------------
  HLFX A  PALM A  PUR2 A  PUR3 A  UPO1 A  OUSD A  MTJO A  HORN A  NETT A  CNCL A
  QUAR A  KARA A  SAMP A  MAR6 A  IENG A
 
MISSING IERS DOMES NOS AT gfz:
-----------------------------
  BISH A  PALM A
 
MISSING IERS DOMES NOS AT sio:
-----------------------------
  KULU A  PUR2 A  CONZ A  OUSD A  CNCL A  KARA A  MERS A  CAVA A  SFEL A  VOLT A
  BRAS A
IERS DOMES NO    mit    ncl    IGS    igs
============= ====== ====== ====== ======
    13407S012 MAD2 A MAD2 A MADR A MADR A
              MADR A 
    43001M002 THU2 A THU3 A THU3 A THU3 A
              THU3 A 
    40405S031 GOLD A GOL2 A GOLD A GOLD A
              GOL2 A GOLD A
    50103M108 TIDB A TID2 A TIDB A TIDB A
              TID1 A TIDB A
              TID2 A 
    50134M001 DARR A DARW A DARW A DARW A
              DARW A 
    50107M004 YAR2 A YAR2 A YAR1 A YAR2 A
                            YAR2 A 
    12313M002 IRKJ A 
              MDVJ A 
    66010M001 DAV1 A DAV1 A DAV1 A DAV1 A
              DAVR A               DAVR A
    10422M001 KIR0 A               KR0G A
    12209M001 LAMA A LAMA A LAMA A LAMA A
 
MISSING IERS DOMES NOS AT mit:
-----------------------------
  BISH A
--