Subject: [IGSREPORT-8272] Wk 1112 IGS SINEX Combination
From: Remi Ferland <[email-masked]>
To: [email-masked] (IGS Report Mailbox)
Date: Thu, 17 May 2001 15:18:37 EDT

******************************************************************************
IGS Electronic Report   17 May 12:18:47 PDT 2001      Message Number 8272
******************************************************************************

Author:  R. Ferland , D. Hutchison

===================================================================
 Combined AC  solution for GPS week 1112 -  01/04/29 to 01/05/05
===================================================================

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

igs01P1112.snx  Combined weekly solution. 
igs01P1112.erp  Daily Earth Rotation Parameters.
igs00p02.erp    Daily Earth Rotation Parameters since GPS week 1013.
IGS01P18.snx    Cumulative Combined solution. 
igs01P1112.sum  This file.
igs01P1112.itr  Residuals between the AC and the IGS97 for the RF stations. 
igs01P1112.res  Residuals between the AC and the Combined Weekly solution.
IGS01P18.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
     IGS97 stations at the current epoch.
     ftp://igscb.jpl.nasa.gov/igscb/station/coord/IGS00P04_RS51.SNX.Z
3-4) The AC are compared to IGS97, 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 IGS97 of the current
     epoch using a 7-parameters transformation. The singular cumulative
     combined solution is aligned to the IGS97 of the reference epoch
     using a 14-parameters transformation and the 51 ITRF station positions
     and velocities. The IGS97 is a realization of ITRF97.

     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 = IGS00P04_RS51.SNX
     igs = igs01P1112.snx
     IGS = IGS01P18.snx

     BuA = IERS Bulletin A

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

     4-1) Starting with GPS week 1065, the solutions are aligned to the
     IGS00P04_RS51.SNX realization of ITRF97.

     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            | 125 |  41 |        33.823 |         1.000 |        33.828 |
emr            |  43 |  27 |         2.980 |         1.001 |         2.982 |
esa            |  54 |  34 |        10.536 |         1.000 |        10.536 |
gfz            |  65 |  32 |        21.202 |         1.000 |        21.202 |
jpl            |  70 |  28 |         3.706 |         1.000 |         3.707 |
ngs            |  69 |  43 |        20.041 |         1.000 |        20.042 |
sio            | 131 |  40 |         2.411 |         1.024 |         2.469 |
mit            | 157 |  41 |         4.602 |         0.981 |         4.514 |
ncl            | 103 |  42 |         2.744 |         0.999 |         2.741 |
igs            | 130 |  44 |         1.327 |         0.985 |         1.307 |
---------------|-----|-----|---------------|---------------|---------------|

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

5-2-1)    With respect to the IGS97 stations:
=============================================

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod         40 |     0.4      0.8     -0.8 |     4.4      3.9     12.6 |
emr         26 |    -0.7      1.8      0.6 |     3.6      5.3     12.3 |
esa         32 |    -2.1      0.1      1.5 |     7.8      5.7     13.7 |
gfz         31 |     0.2      0.4     -0.4 |     3.0      3.9     10.8 |
jpl         26 |     0.0      0.3     -0.2 |     2.4      3.7     10.8 |
ngs         42 |    -3.3      1.2     -0.4 |     7.1      8.0     14.1 |
sio         38 |    -1.6      1.0     -2.0 |     3.0      4.7     14.9 |
mit         40 |     0.0      0.5     -1.0 |     3.2      2.8     10.1 |
ncl         41 |     0.1      0.4     -0.1 |     2.7      3.4      8.5 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        113 |     1.0      0.4      1.8 |     2.4      2.5      7.9 |
emr         38 |    -0.9      1.5      0.5 |     2.2      5.2      8.2 |
esa         52 |    -2.1     -1.2      0.4 |     5.5      5.2      9.9 |
gfz         58 |     0.2     -0.4      0.3 |     1.7      1.9      6.2 |
jpl         61 |     0.5     -0.1     -1.0 |     2.1      1.5      7.5 |
ngs         66 |    -3.2      0.3     -0.1 |     5.1      7.1      9.5 |
sio        112 |    -0.9      0.4      2.5 |     2.6      3.0     11.8 |
mit        122 |     0.3     -0.1      0.3 |     1.2      1.2      4.2 |
ncl         98 |     0.7     -0.2      1.8 |     1.1      1.1      4.0 |
ITR         43 |     0.3     -0.4     -0.2 |     2.8      3.9     10.2 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        114 |     0.3      2.0      2.5 |     4.4      4.9      9.4 |
emr         39 |    -0.7      1.2      1.0 |     3.0      7.9      9.9 |
esa         53 |    -2.7      0.1      1.3 |     6.6      6.2     11.4 |
gfz         58 |    -0.3      0.3      0.8 |     2.3      3.6      8.3 |
jpl         61 |     0.4      0.4      0.5 |     2.5      3.0      8.5 |
ngs         67 |    -3.5      0.9      0.6 |     6.5      8.6     12.4 |
sio        112 |    -1.2      1.7      3.0 |     3.3      5.5     14.3 |
mit        120 |    -0.2      1.3      0.7 |     3.1      2.8      6.8 |
ncl         97 |     0.3      0.7      2.4 |     2.7      3.1      5.8 |
igs        128 |    -0.5      1.3      0.6 |     2.5      3.1      6.2 |
ITR         51 |     0.0      0.1     -0.2 |     1.3      2.0      5.5 |
---------------|---------------------------|---------------------------|

5-3)      7-Parameters Transformation: AC ----> IGS00P04_RS51.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            |   0.030   -0.129   -0.024     11.1      6.1    -11.1     2.20 |
emr            |  -0.034    0.028   -0.019     20.9     -3.7     43.0     2.22 |
esa            |   0.077    0.022   -0.008     -9.5      3.8      7.0     1.91 |
gfz            |  -0.007   -0.012    0.103     -1.3      0.6     -1.1     2.64 |
jpl            |   0.007   -0.001   -0.032      4.7     -5.1     -6.0     2.16 |
ngs            |   0.287    0.475   -0.001    -40.6     32.8     16.9     2.13 |
sio            |   0.108    0.202   -0.029      0.5     19.0     67.7     1.49 |
mit            |  -0.011   -0.012   -0.010      0.2     -0.2     -0.1     2.28 |
ncl            |  -0.061    0.160   -0.316     11.6     -3.2     -7.7     1.95 |
---------------|---------------------------------------------------------------|

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            |   0.061    0.064    0.069      1.6      1.6      1.6     0.25 |
emr            |   0.076    0.076    0.091      2.0      2.0      2.0     0.31 |
esa            |   0.071    0.071    0.078      1.8      1.8      1.8     0.29 |
gfz            |   0.067    0.073    0.082      1.8      1.8      1.8     0.28 |
jpl            |   0.076    0.074    0.089      2.0      2.0      2.0     0.31 |
ngs            |   0.060    0.062    0.069      1.6      1.6      1.6     0.25 |
sio            |   0.064    0.065    0.072      1.7      1.7      1.6     0.26 |
mit            |   0.061    0.063    0.072      1.6      1.6      1.6     0.25 |
ncl            |   0.060    0.063    0.069      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            |     8.8     -0.8    -13.3 |     2.3      3.2      7.0 |
---------------|---------------------------|---------------------------|

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            |     ---      -10.6      -2.6       1.8       8.4       -.7 |
emr            |     ---      -18.1      12.7      27.0      -1.2       8.1 |
esa            |     ---      -21.2      -1.0       4.1     -11.9       1.7 |
gfz            |     ---       20.5       4.4        .5       1.4      -2.0 |
jpl            |     ---      -16.1       1.4      12.7       3.5      14.2 |
ngs            |     ---       27.4      -9.8    -150.7       -.3     -55.6 |
sio            |     ---       17.7      -1.0        .2       5.0     -12.7 |
mit            |     ---       18.0      -4.6       1.0      -5.2       -.4 |
ncl            |     ---        ---       ---       ---       ---       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---        -.3       5.0       1.0      27.6      -1.9 |
---------------|------------------------------------------------------------|

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

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---       10.3       2.9      14.3       4.2       9.4 |
emr            |     ---       10.5      10.1      14.0       6.9      27.9 |
esa            |     ---       11.4       5.5      24.1       3.4      12.3 |
gfz            |     ---       11.4       2.6       6.9       4.4       6.8 |
jpl            |     ---       35.8       3.9      15.2       4.4      12.7 |
ngs            |     ---       25.3      15.1      59.3      16.1      27.5 |
sio            |     ---       18.1       4.4      23.1       3.7       8.0 |
mit            |     ---        6.2       2.2       1.4       1.8       3.8 |
ncl            |     ---        ---       ---       ---       ---       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       21.8       8.6      18.7      12.3      22.4 |
---------------|------------------------------------------------------------|

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

Thresholds set at 5 sigmas and 50 mm.

 Solution             Solution           |  Station   |    N       E       U  |
              Minus                      |code id soln|   (mm)    (mm)    (mm)|
-----------------------------------------|------------|-----------------------|
                                         |            |                       |
IGS00P04_RS51.snx    sio11127.snx        |TSKB  A ----|   -5.0    -6.1    38.4|
                                         |            |                       |
cod11127.snx         emr11127.snx        |EISL  A ----|    1.8     0.8   -51.1|
                                         |            |                       |
cod11127.snx         ngs11127.snx        |BAKO  A ----|   -8.0     7.7   -66.5|
                                         |            |                       |
emr11127.snx         sio11127.snx        |PIMO  A ----|    9.3     5.4    50.6|
                                         |            |                       |
esa11127.snx         ngs11127.snx        |ASC1  A ----|  -24.8   -72.6   106.8|
                                         |            |                       |
gfz11127.snx         ngs11127.snx        |ASC1  A ----|  -15.4   -90.2    88.3|
                                         |            |                       |
jpl11127.snx         sio11127.snx        |PIMO  A ----|   -6.8    10.7    57.9|
jpl11127.snx         sio11127.snx        |SANT  A ----|    4.5    -1.9    51.8|
                                         |            |                       |
ngs11127.snx         sio11127.snx        |ASC1  A ----|   15.2    62.9   -94.8|
                                         |            |                       |
ngs11127.snx         mit1112g.snx        |ASC1  A ----|   18.3    85.0   -97.7|
                                         |            |                       |
ngs11127.snx         ncl1112g.snx        |ASC1  A ----|   16.8    86.4   -96.0|
                                         |            |                       |
igs01P1111.snx       esa11127.snx        |SANT  A ----|    9.7    -5.6    60.9|
                                         |            |                       |
IGS01P17.snx         cod11127.snx        |BILI  A ----|   41.4     7.9  -136.6|
                                         |            |                       |
IGS01P17.snx         gfz11127.snx        |BILI  A ----|   43.0     5.4  -137.8|
                                         |            |                       |
IGS01P17.snx         gfz11127.snx        |COCO  A ----|    7.9   -34.3     1.6|
                                         |            |                       |
IGS01P17.snx         gfz11127.snx        |LAE1  A ----|    2.9    -3.4    40.6|
                                         |            |                       |
IGS01P17.snx         jpl11127.snx        |COCO  A ----|    8.7   -27.9     3.5|
                                         |            |                       |
IGS01P17.snx         sio11127.snx        |BILI  A ----|   45.0     9.0  -111.3|
                                         |            |                       |
IGS01P17.snx         sio11127.snx        |ANKR  A ----|   -9.2    18.7     6.7|
IGS01P17.snx         sio11127.snx        |YSSK  A ----|   -0.4     1.0    30.8|
                                         |            |                       |
IGS01P17.snx         mit1112g.snx        |BILI  A ----|   42.4     8.4  -135.0|
                                         |            |                       |
IGS01P17.snx         mit1112g.snx        |ANKR  A ----|   -8.3    13.6    -2.9|
IGS01P17.snx         mit1112g.snx        |COCO  A ----|   10.3   -30.7     5.7|
IGS01P17.snx         mit1112g.snx        |JAB1  A ----|   14.9    -2.0     4.4|
IGS01P17.snx         mit1112g.snx        |RAMO  A ----|   -1.1    15.8     3.5|
                                         |            |                       |
IGS01P17.snx         ncl1112g.snx        |BILI  A ----|   44.8     7.8  -129.5|
                                         |            |                       |
IGS01P17.snx         ncl1112g.snx        |COCO  A ----|    9.3   -30.8     4.6|
                                         |            |                       |
IGS01P18.snx         igs01P1112.snx      |COCO  A ----|    7.3   -27.2     1.1|
IGS01P18.snx         igs01P1112.snx      |RAMO  A ----|   -1.1    14.7     5.0|
-----------------------------------------|------------|-----------------------|

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 A AREQ B AREQ A AREQ A AREQ A
    30314M002 SUTH A SUTH A SUTH B SUTH A SUTH A SUTH A SUTH A SUTH A SUTH A
    13407S012 MADR A               MADR A MAD2 A MADR A MAD2 A MADR A MADR A
    12353M001 YAKZ A                             YAKZ A YAKZ A YAKA A YAKA A
    42005M001 GALA A        GALA B GALA A        GALA B GALA A GALA A GALA A
    40114M001 NRC1 A NRC1 A               NRC1 A        NRC1 A NRC1 A NRC1 A
                     NRC2 A 
    40405S031 GOLD A        GOL2 A GOLD A        GOL2 A GOL2 A GOLD A GOLD A
    50103M108 TIDB A TIDB A TID2 A TIDB A TID1 A TID2 A TID2 A TIDB A TIDB A
                                          TIDB A
    50107M004 YAR1 A YAR1 A YAR1 A YAR1 A YAR1 A YAR1 A YAR1 A YAR1 A YAR1 A
                                          YAR2 A
    51002M001 LAE1 A                                                  LAE1 A
    51002S001                      LAE1 A               LAE1 A
    22306M002 IISC A IISC A IISC B               IISC B IISC A IISC A IISC A
    22003M001        PIMO A PIMO B        PIMO A        PIMO A PIMO A PIMO A
 
MISSING IERS DOMES NOS AT gfz:
-----------------------------
  BISH 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 GOL2 A GOLD A GOLD A
              GOL2 A 
    50103M108 TIDB A TID2 A TIDB A TIDB A
              TID1 A TIDB A
              TID2 A 
    51002S001 LAE1 A 
    51002M001        LAE1 A        LAE1 A
    12353M001 YAKZ A YAKZ A YAKA A YAKA A
    50107M004 YAR1 A YAR1 A YAR1 A YAR1 A
              YAR2 A 
    12309M001 MDVO A 
    12309M002               MDVO A MDVO A
 
MISSING IERS DOMES NOS AT mit:
-----------------------------
  BISH A
--