Subject: [IGSREPORT-7683] Wk 1083 IGS SINEX Combination
From: Remi Ferland <[email-masked]>
To: [email-masked] (IGS Report Mailbox)
Date: Thu, 26 Oct 2000 19:54:53 EDT

******************************************************************************
IGS Electronic Report   26 Oct 16:54:55 PDT 2000      Message Number 7683
******************************************************************************

Author:  R. Ferland , D. Hutchison

===================================================================
 Combined AC  solution for GPS week 1083 -  00/10/08 to 00/10/14
===================================================================

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

igs00P1083.snx  Combined weekly solution. 
igs00P1083.erp  Daily Earth Rotation Parameters.
igs00p02.erp    Daily Earth Rotation Parameters since GPS week 1013.
IGS00P41.snx    Cumulative Combined solution. 
igs00P1083.sum  This file.
igs00P1083.itr  Residuals between the AC and the IGS97 for the RF stations. 
igs00P1083.res  Residuals between the AC and the Combined Weekly solution.
IGS00P41.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 = igs00P1083.snx
     IGS = IGS00P41.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            | 127 |  45 |        30.704 |         1.003 |        30.793 |
emr            |  49 |  36 |         2.246 |         1.002 |         2.251 |
esa            |  54 |  39 |         8.956 |         1.001 |         8.965 |
gfz            |  72 |  39 |        24.583 |         1.003 |        24.662 |
jpl            |  69 |  32 |         3.412 |         1.004 |         3.426 |
ngs            |  77 |  49 |        21.336 |         0.997 |        21.280 |
sio            | 134 |  48 |         2.093 |         1.003 |         2.100 |
mit            | 153 |  47 |         4.732 |         1.004 |         4.750 |
ncl            | 102 |  50 |         2.640 |         0.995 |         2.627 |
igs            | 132 |  50 |         1.386 |         1.010 |         1.400 |
---------------|-----|-----|---------------|---------------|---------------|

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         43 |     0.9      0.3     -0.9 |     3.2      3.5     10.9 |
emr         34 |    -0.2      0.0     -0.6 |     2.6      3.9      9.9 |
esa         36 |    -0.8      0.0     -0.5 |     6.9      6.0      8.7 |
gfz         38 |     2.1     -0.1     -0.3 |     2.5      3.5      8.4 |
jpl         31 |     0.1     -0.1     -0.3 |     2.9      3.6     10.0 |
ngs         48 |    -3.1     -0.6     -0.1 |     4.2      5.6     10.4 |
sio         47 |    -0.5     -0.4     -1.1 |     2.5      3.3     10.6 |
mit         46 |     1.1     -0.3     -0.8 |     2.2      2.8      8.3 |
ncl         49 |     0.7     -0.4     -0.5 |     2.4      3.2      7.2 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        119 |     0.6      0.5     -0.1 |     2.9      2.4      8.5 |
emr         48 |    -0.5      0.7     -1.0 |     1.9      3.8      4.4 |
esa         53 |    -0.7      0.3     -0.2 |     6.3      5.8      8.9 |
gfz         66 |     1.7     -0.2      0.5 |     1.7      1.8      6.0 |
jpl         63 |    -0.4      0.1     -0.7 |     1.7      1.7      5.8 |
ngs         74 |    -3.2     -1.1      0.7 |     5.1      6.8      7.7 |
sio        120 |    -0.6      0.2      0.4 |     1.9      2.2      6.1 |
mit        125 |     0.8      0.0      0.5 |     1.2      1.0      3.4 |
ncl         97 |     0.5     -0.2      0.5 |     1.1      1.2      3.5 |
ITR         49 |    -0.4      0.1     -0.4 |     2.2      3.1     10.0 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        121 |     0.6      0.1     -1.2 |     4.0      4.0     10.4 |
emr         48 |    -0.2      0.5     -0.3 |     2.7      3.8      8.1 |
esa         54 |    -0.6      0.1     -0.2 |     6.5      5.7     10.0 |
gfz         67 |     1.7      0.0      0.5 |     2.4      3.1      8.3 |
jpl         64 |    -0.4      0.3     -0.3 |     2.6      3.0      8.0 |
ngs         76 |    -3.0     -1.3      0.7 |     4.8      7.5      9.3 |
sio        121 |    -0.5      0.0     -0.5 |     2.4      3.7      9.3 |
mit        127 |     0.8     -0.3     -0.5 |     2.5      2.7      7.2 |
ncl         98 |     0.5     -0.2      0.6 |     2.4      2.9      6.3 |
igs        132 |     0.1     -0.3     -0.7 |     2.0      2.6      6.6 |
ITR         51 |    -0.1      0.1     -0.2 |     0.9      1.3      3.9 |
---------------|---------------------------|---------------------------|

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            |   0.006   -0.016    0.003     -2.0     -1.3    -10.8     2.50 |
emr            |  -0.001    0.016   -0.012      0.7     14.8    -55.6     2.19 |
esa            |   0.098    0.027   -0.053     -5.6     12.1     -3.2     1.29 |
gfz            |  -0.063    0.005   -0.100     -0.2      0.8     -2.0     1.15 |
jpl            |  -0.019   -0.007   -0.004    -10.5      7.2    -34.5     2.12 |
ngs            |  -0.133    0.119    0.096     -4.0     -6.6     56.0     1.78 |
sio            |  -0.063    0.406    0.062     -5.0      0.4     75.0     2.08 |
mit            |   0.011    0.003    0.009     -1.6      0.0     -2.2     1.75 |
ncl            |  -0.093    0.115   -0.296     11.8     -5.4    -11.8     1.50 |
---------------|---------------------------------------------------------------|

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    0.062    0.068      1.6      1.6      1.6     0.25 |
emr            |   0.066    0.067    0.080      1.8      1.8      1.8     0.28 |
esa            |   0.068    0.068    0.074      1.8      1.8      1.7     0.27 |
gfz            |   0.064    0.064    0.074      1.7      1.7      1.7     0.26 |
jpl            |   0.070    0.069    0.079      1.8      1.8      1.8     0.28 |
ngs            |   0.057    0.058    0.064      1.5      1.5      1.5     0.23 |
sio            |   0.058    0.058    0.065      1.5      1.5      1.5     0.23 |
mit            |   0.059    0.059    0.067      1.5      1.5      1.5     0.24 |
ncl            |   0.057    0.058    0.064      1.5      1.5      1.5     0.23 |
---------------|---------------------------------------------------------------|

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

               |      X        Y        Z  |    s X      s Y      s Z  |
               |    (mm)     (mm)     (mm) |    (mm)     (mm)     (mm) |
---------------|---------------------------|---------------------------|
igs            |    -5.1     -1.7    -28.7 |     5.6      5.6      7.5 |
---------------|---------------------------|---------------------------|

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            |     ---        4.0     -17.8       -.5      -4.0       2.4 |
emr            |     ---       -9.3       5.1      -8.9       8.2      16.2 |
esa            |     ---      -16.8      -5.5        .4     -19.1      -1.0 |
gfz            |     ---       -3.3       3.9       3.0       4.3      -3.4 |
jpl            |     ---        3.3       4.9      19.7        .9      -3.2 |
ngs            |     ---      -85.4     -16.9      17.0      17.8      40.2 |
sio            |     ---       19.2        .0       2.5       1.2       -.7 |
mit            |     ---        7.9      11.7       -.2       -.1       -.5 |
ncl            |     ---        ---       ---       ---       ---       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---      -10.8        .8       -.8      30.2       1.2 |
---------------|------------------------------------------------------------|

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

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---        7.2       2.9      11.1       4.8      10.3 |
emr            |     ---        9.7       6.3      26.5       5.4      20.1 |
esa            |     ---        6.4       4.9      10.3       4.3      12.5 |
gfz            |     ---        2.3       1.9       4.3       1.4       3.7 |
jpl            |     ---       16.4       3.5       9.3       3.1      14.6 |
ngs            |     ---      150.7       6.9      60.2      13.5      54.1 |
sio            |     ---        8.3       3.1       9.6       4.0       7.1 |
mit            |     ---        5.7        .5       1.1        .6       1.0 |
ncl            |     ---        ---       ---       ---       ---       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---        9.0       5.0      12.2       7.3       8.7 |
---------------|------------------------------------------------------------|

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

Thresholds set at 5 sigmas and 50 mm.

 Solution             Solution           |  Station   |    N       E       U  |
              Minus                      |code id soln|   (mm)    (mm)    (mm)|
-----------------------------------------|------------|-----------------------|
                                         |            |                       |
IGS00P04_RS51.snx    esa10837.snx        |MALI  A ----|   20.1    -2.2   -57.5|
                                         |            |                       |
cod10837.snx         esa10837.snx        |OHIG  A ----|   12.0     5.8    50.9|
                                         |            |                       |
cod10837.snx         sio10837.snx        |GOPE  A ----|    5.1   -12.3    57.0|
                                         |            |                       |
emr10837.snx         esa10837.snx        |KWJ1  A ----|    5.2    -3.5    58.6|
                                         |            |                       |
jpl10837.snx         sio10837.snx        |CRO1  A ----|    3.9     4.0   -54.4|
                                         |            |                       |
ngs10837.snx         sio10837.snx        |CRO1  A ----|    9.5    16.6   -64.4|
                                         |            |                       |
ngs10837.snx         mit1083g.snx        |CRO1  A ----|   13.2    13.0   -53.8|
                                         |            |                       |
ngs10837.snx         ncl1083g.snx        |CRO1  A ----|   12.0    14.7   -51.7|
                                         |            |                       |
IGS00P40.snx         emr10837.snx        |COCO  A ----|    9.4   -45.4    -7.6|
                                         |            |                       |
IGS00P40.snx         gfz10837.snx        |COCO  A ----|    8.4   -35.4    -2.1|
                                         |            |                       |
IGS00P40.snx         jpl10837.snx        |COCO  A ----|    6.3   -31.6    -5.8|
                                         |            |                       |
IGS00P40.snx         sio10837.snx        |COCO  A ----|    2.1   -35.0     7.6|
                                         |            |                       |
IGS00P40.snx         mit1083g.snx        |COCO  A ----|    7.2   -35.5     6.4|
                                         |            |                       |
IGS00P40.snx         ncl1083g.snx        |COCO  A ----|    6.5   -36.2     4.9|
                                         |            |                       |
IGS00P40.snx         igs00P1083.snx      |COCO  A ----|    4.6   -36.8     8.1|
IGS00P40.snx         igs00P1083.snx      |REYK  A ----|   -7.9     7.6    -1.7|
-----------------------------------------|------------|-----------------------|

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

IERS DOMES NO    cod    emr    esa    gfz    jpl    ngs    sio    IGS    igs
============= ====== ====== ====== ====== ====== ====== ====== ====== ======
    31303M002 MAS1 A MAS1 A MASP A MAS1 A MAS1 A MAS1 A MAS1 A MAS1 A MAS1 A
    42005M001 GALA A        GALA B GALA A GALA A GALA B GALA A GALA A GALA A
    20703S001 RAMO A                                    ELRO A RAMO A RAMO A
                                                        RAMO A
    13407S012 MADR A               MADR A        MADR A MAD2 A MADR A MADR A
    12353M001 YAKZ A                             YAKZ A YAKZ A YAKA A YAKA A
    24901M002 BAHR A BAHR A BAHR A BAHR A BAHR A BAHR A        BAHR A BAHR A
    249010M02                                           BAHR A
    40114M001 NRC1 A 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
    42202M005 AREQ A AREQ A AREQ A AREQ A AREQ A AREQ B AREQ A AREQ A AREQ A
    50103M108 TIDB A        TID2 A TIDB A TIDB A TID2 A TID2 A TIDB A TIDB A
    22306M002 IISC A IISC A IISC B        IISC A IISC B IISC A IISC A IISC A
    14208M001                      OBER A                      OBER A OBER A
    142080M01                                           OBER A
 
MISSING IERS DOMES NOS AT gfz:
-----------------------------
  BISH A
 
MISSING IERS DOMES NOS AT sio:
-----------------------------
  GUAT A  CLGO A  NYA1 A  NYAL 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
              TID2 A TIDB A
    12353M001 YAKZ A YAKZ A YAKA A YAKA A
    249010M02 BAHR A 
    24901M002        BAHR A BAHR A BAHR A
    12309M001 MDVO A 
    12309M002               MDVO A MDVO A
    142080M01 OBER A 
    14208M001               OBER A OBER A
 
MISSING IERS DOMES NOS AT mit:
-----------------------------
  BISH A
--