Subject: [IGSREPORT-7660] Wk 1082 IGS SINEX Combination
From: Remi Ferland <[email-masked]>
To: [email-masked] (IGS Report Mailbox)
Date: Thu, 19 Oct 2000 10:05:57 EDT

******************************************************************************
IGS Electronic Report   19 Oct 07:06:00 PDT 2000      Message Number 7660
******************************************************************************

Author:  R. Ferland , D. Hutchison

===================================================================
 Combined AC  solution for GPS week 1082 -  00/10/01 to 00/10/07
===================================================================

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

igs00P1082.snx  Combined weekly solution. 
igs00P1082.erp  Daily Earth Rotation Parameters.
igs00p02.erp    Daily Earth Rotation Parameters since GPS week 1013.
IGS00P40.snx    Cumulative Combined solution. 
igs00P1082.sum  This file.
igs00P1082.itr  Residuals between the AC and the IGS97 for the RF stations. 
igs00P1082.res  Residuals between the AC and the Combined Weekly solution.
IGS00P40.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 = igs00P1082.snx
     IGS = IGS00P40.snx

     BuA = IERS Bulletin A

     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            | 124 |  45 |        29.593 |         1.000 |        29.599 |
emr            |  41 |  31 |         2.660 |         1.000 |         2.661 |
esa            |  54 |  40 |         9.538 |         1.000 |         9.538 |
gfz            |  72 |  39 |        20.773 |         1.000 |        20.775 |
jpl            |  73 |  32 |         3.487 |         1.000 |         3.488 |
ngs            |  74 |  48 |        20.967 |         1.000 |        20.969 |
sio            | 135 |  47 |         2.055 |         1.000 |         2.056 |
ncl            | 100 |  48 |         2.639 |         1.000 |         2.640 |
igs            | 135 |  50 |         1.493 |         0.996 |         1.488 |
---------------|-----|-----|---------------|---------------|---------------|

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         44 |    -0.2      0.4     -0.8 |     3.8      3.6     10.5 |
emr         30 |    -2.9      0.6      0.6 |     3.7      5.1      9.2 |
esa         38 |    -1.4      0.0     -0.2 |     6.9      4.4     10.7 |
gfz         38 |     1.4     -0.1     -0.1 |     2.4      3.5      7.8 |
jpl         31 |     0.5      0.4     -0.1 |     3.1      3.3      9.2 |
ngs         46 |    -1.6     -0.2     -0.3 |     3.6      4.0     10.7 |
sio         46 |    -0.4      0.2     -1.0 |     2.7      3.2     10.2 |
ncl         47 |     0.4     -0.1     -0.1 |     2.4      3.1      6.5 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        118 |    -1.0      0.4      0.1 |     3.4      2.3      8.7 |
emr         40 |    -3.2      0.8      0.6 |     2.6      4.1      5.1 |
esa         54 |    -1.3      0.0      0.9 |     6.5      4.7      8.5 |
gfz         69 |     0.8     -0.4      0.0 |     1.4      1.4      6.4 |
jpl         69 |     0.0      0.3     -0.7 |     2.1      1.6      5.9 |
ngs         72 |    -1.9     -0.7     -1.1 |     3.4      5.7      8.5 |
sio        121 |    -0.7      0.5      0.5 |     1.9      2.3      5.9 |
ncl         96 |     0.1     -0.4      0.9 |     1.1      1.4      3.3 |
ITR         49 |    -0.5      0.0     -0.3 |     2.1      2.9      8.3 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        119 |    -0.5      0.3     -0.9 |     4.2      4.0      9.4 |
emr         40 |    -2.8      1.0      1.2 |     3.4      5.1      7.6 |
esa         54 |    -1.0      0.2      0.0 |     6.6      4.8     11.1 |
gfz         69 |     1.0      0.0     -0.1 |     2.5      2.9      8.4 |
jpl         69 |     0.6      0.8     -0.7 |     3.2      2.8      7.0 |
ngs         73 |    -1.4     -0.4     -0.9 |     4.2      6.9      8.7 |
sio        121 |    -0.3      0.6     -0.4 |     2.6      3.5      9.5 |
ncl         97 |     0.4      0.1      1.0 |     2.5      3.0      6.1 |
igs        135 |     0.4      0.2     -0.8 |     2.1      2.5      6.4 |
ITR         51 |    -0.1      0.1     -0.2 |     0.8      1.3      3.8 |
---------------|---------------------------|---------------------------|

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            |   0.012   -0.025    0.005     -2.3      0.8    -15.5     2.35 |
emr            |   0.008   -0.011    0.015    -16.2     -0.2     -6.9     1.60 |
esa            |   0.072    0.042   -0.026     -5.9      6.1    -11.2     1.47 |
gfz            |  -0.060    0.006   -0.062     -0.1      0.7     -2.5     1.38 |
jpl            |  -0.011   -0.014   -0.017     -7.9      6.0    -20.5     2.19 |
ngs            |  -0.236    0.036    0.103      5.8     -7.2     59.4     2.67 |
sio            |  -0.171    0.271    0.046     -0.4     -2.8     60.1     1.97 |
ncl            |  -0.112    0.094   -0.301     12.4     -6.0    -10.4     1.48 |
---------------|---------------------------------------------------------------|

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    0.067      1.6      1.6      1.5     0.24 |
emr            |   0.071    0.072    0.082      1.9      1.9      1.9     0.29 |
esa            |   0.067    0.066    0.070      1.7      1.7      1.7     0.26 |
gfz            |   0.065    0.065    0.073      1.7      1.7      1.7     0.26 |
jpl            |   0.071    0.069    0.079      1.8      1.8      1.8     0.28 |
ngs            |   0.060    0.061    0.065      1.6      1.6      1.5     0.24 |
sio            |   0.058    0.059    0.065      1.5      1.5      1.5     0.24 |
ncl            |   0.058    0.059    0.065      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            |    -2.5     -1.2    -23.9 |     6.0      6.1      8.2 |
---------------|---------------------------|---------------------------|

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            |     ---       -7.8     -11.4      -3.7      -8.0      -2.3 |
emr            |     ---      -18.3      -8.4      -6.1       8.9      22.2 |
esa            |     ---      -18.0      -5.9      -1.3     -20.9        .4 |
gfz            |     ---        8.6      -1.2       2.4       1.2       1.3 |
jpl            |     ---      -18.1       4.2      -2.1       6.4      12.7 |
ngs            |     ---      277.7     -12.7       7.4      13.5       7.6 |
sio            |     ---       18.7      -1.5       5.2       2.2      -5.2 |
ncl            |     ---        ---       ---       ---       ---       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---      -20.1      -1.5        .4      24.2        .7 |
---------------|------------------------------------------------------------|

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

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---       12.4       4.6      12.5       4.6       6.5 |
emr            |     ---        8.7       6.4       9.7       6.3      13.8 |
esa            |     ---       10.5       2.2      11.6       1.4       5.4 |
gfz            |     ---       14.0       1.8       9.2       1.8      10.9 |
jpl            |     ---        9.6       3.0      17.0       3.7      17.7 |
ngs            |     ---      132.9       8.0      23.5       8.2      53.9 |
sio            |     ---       20.3       2.3       8.9       3.1       6.9 |
ncl            |     ---        ---       ---       ---       ---       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       21.2       8.1      11.2       4.0       8.8 |
---------------|------------------------------------------------------------|

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

Thresholds set at 5 sigmas and 50 mm.

 Solution             Solution           |  Station   |    N       E       U  |
              Minus                      |code id soln|   (mm)    (mm)    (mm)|
-----------------------------------------|------------|-----------------------|
                                         |            |                       |
cod10827.snx         ngs10827.snx        |BAKO  A ----|  -10.7     6.4    55.0|
                                         |            |                       |
esa10827.snx         ngs10827.snx        |OHIG  A ----|  -43.8     7.9   -55.7|
                                         |            |                       |
ngs10827.snx         sio10827.snx        |BAKO  A ----|    6.2    -8.9   -53.8|
ngs10827.snx         sio10827.snx        |CRO1  A ----|    5.2     0.4   -54.9|
ngs10827.snx         sio10827.snx        |NTUS  A ----|    1.5    57.2   -26.5|
                                         |            |                       |
IGS00P39.snx         emr10827.snx        |COCO  A ----|    7.3   -41.3    -2.0|
                                         |            |                       |
IGS00P39.snx         gfz10827.snx        |COCO  A ----|    8.5   -37.6    -4.0|
                                         |            |                       |
IGS00P39.snx         jpl10827.snx        |COCO  A ----|    9.7   -29.2     0.4|
                                         |            |                       |
IGS00P39.snx         sio10827.snx        |COCO  A ----|    2.5   -38.2    10.8|
IGS00P39.snx         sio10827.snx        |LAMA  A ----|   30.8    -3.8     5.6|
                                         |            |                       |
IGS00P39.snx         ncl1082g.snx        |COCO  A ----|    8.2   -35.9     7.1|
                                         |            |                       |
IGS00P39.snx         igs00P1082.snx      |COCO  A ----|    5.9   -38.2     7.0|
-----------------------------------------|------------|-----------------------|

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

IERS DOMES NO    cod    emr    esa    gfz    jpl    ngs    sio    IGS    igs
============= ====== ====== ====== ====== ====== ====== ====== ====== ======
    20703S001 RAMO A                      RAMO A        ELRO A RAMO A RAMO A
                                                        RAMO A
    31303M002 MAS1 A MAS1 A MASP A MAS1 A MAS1 A MAS1 A MAS1 A MAS1 A MAS1 A
    24901M002 BAHR A        BAHR A BAHR A BAHR A BAHR A        BAHR A BAHR A
    249010M02                                           BAHR A
    12353M001 YAKZ A                             YAKZ A YAKZ A YAKA A YAKA A
    42005M001 GALA A        GALA B GALA A GALA A GALA B GALA A GALA A GALA A
    40114M001 NRC1 A NRC1 A NRC1 A        NRC1 A        NRC1 A NRC1 A NRC1 A
                     NRC2 A 
    13407S012 MADR A               MADR A MAD2 A MADR A MAD2 A MADR A MADR 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 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
IERS DOMES NO    ncl    IGS    igs
============= ====== ====== ======
    40405S031 GOL2 A GOLD A GOLD A
    50103M108 TID2 A TIDB A TIDB A
              TIDB A
    12353M001 YAKZ A YAKA A YAKA A
--