Subject: [IGSREPORT-9662] Wk 1185 IGS SINEX Combination
From: Remi Ferland <[email-masked]>
To: [email-masked] (IGS Report Mailbox)
Date: Thu, 10 Oct 2002 22:22:33 EDT

******************************************************************************
IGS Electronic Report   10 Oct 19:22:39 PDT 2002      Message Number 9662
******************************************************************************

Author:  R. Ferland , D. Hutchison

===================================================================
 Combined AC  solution for GPS week 1185 -  02/09/22 to 02/09/28
===================================================================

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

igs02P1185.snx  Combined weekly solution. 
igs02P1185.erp  Daily Earth Rotation Parameters.
igs00p02.erp    Daily Earth Rotation Parameters since GPS week 1013.
IGS02P39.snx    Cumulative Combined solution. 
igs02P1185.sum  This file.
igs02P1185.itr  Residuals between the AC and the IGS00 for the RF stations. 
igs02P1185.res  Residuals between the AC and the Combined Weekly solution.
IGS02P39.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 = igs02P1185.snx
     IGS = IGS02P39.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:
         After unconstraining:
             ngs  BAKO
             cod  NLIB
             jpl  KELY

     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            | 145 |  46 |        23.671 |         0.982 |        23.241 |
emr            |  40 |  21 |         6.301 |         0.996 |         6.278 |
esa            |  54 |  39 |         9.398 |         0.886 |         8.330 |
gfz            | 148 |  44 |         7.338 |         0.994 |         7.293 |
jpl            |  92 |  33 |         4.464 |         0.949 |         4.238 |
ngs            |  78 |  50 |        29.524 |         0.996 |        29.409 |
sio            | 126 |  43 |         1.888 |         0.997 |         1.883 |
mit            | 193 |  48 |         3.254 |         0.949 |         3.088 |
ncl            | 124 |  47 |         2.141 |         0.949 |         2.032 |
igs            | 185 |  49 |         1.110 |         1.059 |         1.175 |
---------------|-----|-----|---------------|---------------|---------------|

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 |     1.5      0.8      0.2 |     3.4      4.4     12.0 |
emr         20 |     0.3      0.0      0.1 |     5.3      3.9      8.2 |
esa         36 |    -1.0      0.6      0.9 |     4.4      4.9     10.0 |
gfz         43 |    -0.6      0.5     -0.4 |     2.9      3.0      8.1 |
jpl         32 |     0.3      0.5      0.3 |     3.3      3.9      9.9 |
ngs         49 |    -2.4      0.7      0.0 |     8.4      8.3     12.6 |
sio         42 |    -1.5      0.7     -1.1 |     4.1      3.8     10.4 |
mit         47 |    -0.2      0.6     -0.6 |     3.1      3.2      8.2 |
ncl         46 |     0.2      0.5     -0.1 |     2.9      2.9      6.2 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        141 |     1.6      0.9      0.5 |     1.9      2.2      8.3 |
emr         37 |     1.0      1.2     -0.3 |     2.0      2.6      7.2 |
esa         51 |    -0.7      0.5      1.4 |     3.7      4.6      8.1 |
gfz        143 |    -0.4      0.4     -0.1 |     1.0      1.3      4.6 |
jpl         89 |     0.9      0.6      0.8 |     1.8      2.1      7.7 |
ngs         72 |    -2.1      0.0     -0.5 |     6.4      7.7     10.3 |
sio        117 |    -1.3      0.2     -1.0 |     1.7      2.9      7.9 |
mit        178 |     0.2      0.4      0.0 |     0.6      0.7      3.9 |
ncl        120 |     0.5      0.2      0.3 |     0.6      0.7      2.9 |
ITR         48 |     0.2     -1.0      0.1 |     2.9      2.6      7.4 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        130 |     0.8      1.4     -1.2 |     2.8      3.2     10.7 |
emr         39 |     0.1      0.8      0.4 |     3.5      3.0      9.0 |
esa         53 |    -0.9      1.1      1.0 |     3.9      4.9      9.2 |
gfz        121 |    -1.3      0.5     -0.9 |     2.2      2.3      6.5 |
jpl         82 |    -0.2      0.7      0.3 |     2.7      2.8      9.2 |
ngs         76 |    -3.1     -0.4     -0.1 |     8.6      8.5     11.8 |
sio        117 |    -2.1      0.9     -1.9 |     2.9      3.7      9.2 |
mit        147 |    -0.6      0.9     -1.2 |     2.1      2.0      6.8 |
ncl        117 |    -0.3      0.5     -0.1 |     1.9      1.6      6.2 |
igs        151 |    -0.7      0.5     -1.1 |     1.7      1.8      5.3 |
ITR         54 |    -0.2     -0.4      0.0 |     1.2      1.4      2.6 |
---------------|---------------------------|---------------------------|

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            |   0.010   -0.015   -0.028     11.2     14.0      0.8     1.66 |
emr            |   0.005   -0.049   -0.013      5.7      9.9    -15.6     1.10 |
esa            |   0.049    0.073   -0.018     -1.9     12.9    -12.3     0.09 |
gfz            |  -0.025   -0.003    0.013     -1.1      0.7     -1.4     0.97 |
jpl            |   0.001   -0.012   -0.088      2.5      0.6     -5.8     0.74 |
ngs            |  -0.077   -0.044   -0.048     -2.1     -9.7    -13.2     0.80 |
sio            |   0.043    0.136   -0.116      9.1      7.5     38.4     1.11 |
mit            |   0.002   -0.002   -0.022      0.0      0.4     -0.4     1.30 |
ncl            |  -0.026   -0.060   -0.057      1.0      0.2     -2.9     1.05 |
---------------|---------------------------------------------------------------|

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    0.068      1.6      1.6      1.6     0.24 |
emr            |   0.086    0.088    0.099      2.3      2.3      2.3     0.35 |
esa            |   0.070    0.072    0.075      1.9      1.8      1.8     0.28 |
gfz            |   0.059    0.061    0.068      1.6      1.6      1.6     0.24 |
jpl            |   0.068    0.072    0.078      1.8      1.8      1.8     0.28 |
ngs            |   0.056    0.057    0.064      1.5      1.5      1.5     0.23 |
sio            |   0.061    0.061    0.067      1.6      1.6      1.6     0.24 |
mit            |   0.056    0.058    0.066      1.5      1.5      1.5     0.23 |
ncl            |   0.057    0.059    0.066      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            |     4.6     -2.5     -3.1 |     1.8      1.5      3.6 |
---------------|---------------------------|---------------------------|

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            |     ---      -20.2        .9       ---       1.1       --- |
emr            |     ---      -17.6      -4.0      -9.0      -4.1       6.5 |
esa            |     ---      -26.8      -6.9       ---     -27.5       --- |
gfz            |     ---       22.8       1.4      -2.7       1.9       1.6 |
jpl            |     ---      -16.0       1.0     -22.4      -1.4       1.3 |
ngs            |     ---       22.8      19.0      93.1      24.7     -11.2 |
sio            |     ---       -3.3      -4.1       2.8      -2.6      -6.4 |
mit            |     ---      -31.3       1.1       3.1       -.7       1.4 |
ncl            |     ---       14.6        .9       ---        .2       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---      -24.7      -7.2       5.3      20.8       -.4 |
---------------|------------------------------------------------------------|

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

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---        8.3       1.4       ---       1.9       --- |
emr            |     ---       11.3       2.4      10.7       2.5      12.1 |
esa            |     ---       15.1       1.4       ---       3.2       --- |
gfz            |     ---       11.2       2.1       9.9       2.1       7.2 |
jpl            |     ---       38.4       2.0      16.7       2.4       7.8 |
ngs            |     ---       74.3      13.7      64.1       8.6      77.2 |
sio            |     ---       11.2       2.4       8.4       4.7       8.1 |
mit            |     ---       55.8       1.2       9.9        .9       5.8 |
ncl            |     ---        1.5        .5       ---        .7       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       13.0       3.9      10.4       2.8       9.7 |
---------------|------------------------------------------------------------|

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    cod11857.snx        |GUAM  A ----|   15.7   -10.3     3.3|
                                         |            |                       |
IGS01P37_RS54.snx    esa11857.snx        |CHAT  A ----|   -0.9    -8.1   -80.1|
                                         |            |                       |
IGS01P37_RS54.snx    gfz11857.snx        |GUAM  A ----|   16.0   -10.2    18.9|
                                         |            |                       |
IGS01P37_RS54.snx    jpl11857.snx        |GUAM  A ----|   14.9   -10.6    12.4|
IGS01P37_RS54.snx    jpl11857.snx        |THU1  A ----|    8.0     9.7    58.4|
                                         |            |                       |
IGS01P37_RS54.snx    mit1185g.snx        |GUAM  A ----|   15.5    -9.5     9.3|
                                         |            |                       |
IGS01P37_RS54.snx    ncl1185g.snx        |GUAM  A ----|   16.5    -9.1    10.0|
                                         |            |                       |
cod11857.snx         esa11857.snx        |RIOG  A ----|   13.1     2.6    54.4|
                                         |            |                       |
cod11857.snx         ngs11857.snx        |MKEA  A ----|    2.4     4.4    50.5|
                                         |            |                       |
gfz11857.snx         ngs11857.snx        |MKEA  A ----|    7.0     7.7    65.4|
                                         |            |                       |
ngs11857.snx         mit1185g.snx        |MKEA  A ----|   -6.0    -3.9   -50.6|
                                         |            |                       |
cod11857.snx         esa11857.snx        |SANT  A ----|   13.6    13.9    50.7|
                                         |            |                       |
IGS02P38.snx         cod11857.snx        |HOLM  A ----|   25.7    -8.9   175.2|
                                         |            |                       |
IGS02P38.snx         cod11857.snx        |AREQ  A    2|  -20.0   -25.8   -10.4|
IGS02P38.snx         cod11857.snx        |HERS  A ----|    0.0    15.2     6.4|
IGS02P38.snx         cod11857.snx        |URUM  A ----|    1.3    -0.6   -32.5|
                                         |            |                       |
IGS02P38.snx         emr11857.snx        |AREQ  A    2|  -20.4   -29.4    -3.4|
                                         |            |                       |
IGS02P38.snx         gfz11857.snx        |AREQ  A    2|  -23.7   -28.9    -7.9|
                                         |            |                       |
IGS02P38.snx         gfz11857.snx        |KELY  A ----|   -5.7     3.5    52.0|
IGS02P38.snx         gfz11857.snx        |SIO3  A ----|   -0.9     2.9   -52.2|
                                         |            |                       |
IGS02P38.snx         jpl11857.snx        |VNDP  A ----|  -59.9   144.5     4.9|
                                         |            |                       |
IGS02P38.snx         jpl11857.snx        |AREQ  A    2|  -23.3   -30.1   -10.6|
                                         |            |                       |
IGS02P38.snx         ngs11857.snx        |GOUG  A ----|   -3.3    -1.6    51.2|
                                         |            |                       |
IGS02P38.snx         sio11857.snx        |AREQ  A    2|  -21.4   -30.1    16.2|
                                         |            |                       |
IGS02P38.snx         mit1185g.snx        |HOLM  A ----|   22.8    -9.1   169.7|
IGS02P38.snx         mit1185g.snx        |VNDP  A ----|  -62.9   143.7     0.6|
                                         |            |                       |
IGS02P38.snx         mit1185g.snx        |HERS  A ----|   -0.1    12.9     7.9|
IGS02P38.snx         mit1185g.snx        |SIO3  A ----|   -0.3     4.1   -53.9|
IGS02P38.snx         mit1185g.snx        |URUM  A ----|    0.1     0.5   -25.7|
                                         |            |                       |
IGS02P38.snx         ncl1185g.snx        |AREQ  A    2|  -21.8   -29.2    -3.5|
                                         |            |                       |
IGS02P38.snx         igs02P1185.snx      |AREQ  A    2|  -22.8   -31.5     4.0|
IGS02P38.snx         igs02P1185.snx      |BOGT  A ----|   -7.3     0.6    -9.4|
IGS02P38.snx         igs02P1185.snx      |EISL  A ----|   -8.7     0.6    -1.7|
IGS02P38.snx         igs02P1185.snx      |GUAM  A ----|   12.1    -6.3    11.0|
IGS02P38.snx         igs02P1185.snx      |HERS  A ----|   -0.4    12.7     3.3|
IGS02P38.snx         igs02P1185.snx      |TSKB  A ----|   -7.1    -4.4     3.0|
-----------------------------------------|------------|-----------------------|

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 
    42005M001 GALA A GALA A GALA B GALA A GALA A GALA B GALA A GALA A GALA A
    40405S031 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 MADR A MAD2 A MADR A MADR A
    40114M001 NRC1 A NRC1 A NRC1 A NRC1 A               NRC1 A NRC1 A NRC1 A
                     NRC2 A 
    30314M002 SUTH A        SUTH B SUTH A        SUTH A SUTH A SUTH A SUTH A
    50103M108 TIDB A        TIDB A TIDB A TIDB A TID2 A TID2 A TIDB A TID1 A
                            TID2 A TID1 A                             TIDB A
                                   TID2 A 
    50107M004 YAR2 A                      YAR2 A               YAR1 A YAR1 A
 
MISSING IERS DOMES NOS AT gfz:
-----------------------------
  PMON A  PALM A
 
MISSING IERS DOMES NOS AT sio:
-----------------------------
  TCMS A  ZAMB A  CAVA A  SFEL A  VOLT A
IERS DOMES NO    mit    ncl    IGS    igs
============= ====== ====== ====== ======
    13407S012 MADR A MADR A MADR A MADR A
              MAD2 A 
    31303M001 MAS1 A 
    31303M002        MAS1 A MAS1 A MAS1 A
    40114M001 NRC1 A NRC1 A NRC1 A NRC1 A
              NRC2 A 
    40405S031 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        YAR1 A YAR1 A
 
MISSING IERS DOMES NOS AT mit:
-----------------------------
  PALM A  PMON A
--