Subject: [IGSREPORT-11035] Wk 1255 IGS SINEX Combination
From: Remi Ferland <[email-masked]>
To: [email-masked] (IGS Report Mailbox)
Cc: [email-masked] (gendt), [email-masked] (nisn)
Date: Fri, 13 Feb 2004 0:01:51 EST

******************************************************************************
IGS Electronic Report   12 Feb 21:01:57 PST 2004      Message Number 11035
******************************************************************************

Author:  R. Ferland , D. Hutchison

===================================================================
 Combined AC  solution for GPS week 1255 -  04/01/25 to 04/01/31
===================================================================

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

igs04P1255.snx  Combined weekly solution. 
igs04P1255.erp  Daily Earth Rotation Parameters.
igs00p02.erp    Daily Earth Rotation Parameters since GPS week 1013.
IGS04P04.snx    Cumulative Combined solution. 
igs04P1255.sum  This file.
igs04P1255.itr  Residuals between the AC and the IGb00 for the RF stations. 
igs04P1255.res  Residuals between the AC and the Combined Weekly solution.
IGS04P04.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 = igs04P1255.snx
     IGS = IGS04P04.snx

     MIT = mit12557.snx
     mit = mit1255g.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
         After unconstraining:
             ngs  GUAM  KOKB
             mit  IRKJ
             MIT  IRKJ

     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            | 166 |  81 |        30.026 |         1.003 |        30.128 |
emr            |  44 |  33 |         5.767 |         1.005 |         5.797 |
esa            |  69 |  59 |         7.747 |         1.006 |         7.792 |
gfz            | 178 |  89 |         9.687 |         1.001 |         9.701 |
jpl            | 114 |  62 |         5.307 |         1.005 |         5.334 |
MIT            | 146 |  72 |         3.098 |         1.041 |         3.226 |
ngs            |  78 |  77 |        28.265 |         1.001 |        28.302 |
sio            | 172 |  89 |         2.253 |         1.002 |         2.258 |
mit            | 260 |  89 |         1.511 |         1.002 |         1.514 |
ncl            | 159 |  91 |         3.244 |         0.984 |         3.191 |
igs            | 242 |  93 |         1.538 |         1.019 |         1.567 |
---------------|-----|-----|---------------|---------------|---------------|

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         81 |     1.0     -0.0     -0.8 |     2.7      2.5     12.2 |
emr         33 |     0.5      0.1      0.2 |     2.6      2.7     10.9 |
esa         59 |    -3.0      0.2      0.6 |     2.8      2.7     11.9 |
gfz         89 |     1.2     -0.1     -0.8 |     2.8      3.0      7.8 |
jpl         62 |     0.2     -0.1      0.4 |     2.8      2.6      9.9 |
MIT         72 |     0.1      0.1      0.2 |     3.1      2.6      9.5 |
ngs         77 |    -1.8      0.1     -0.2 |     4.1      5.5     11.4 |
sio         89 |     0.2      0.3     -0.3 |     2.8      3.3      6.9 |
mit         89 |     0.6      0.1     -0.0 |     2.5      2.4      8.0 |
ncl         91 |     0.8      0.0     -0.1 |     2.6      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        163 |    -0.1      0.2     -0.2 |     1.2      1.2      7.4 |
emr         43 |    -0.3     -0.1      0.4 |     1.9      1.7      7.2 |
esa         68 |    -3.4      0.3      0.8 |     2.1      1.9     10.3 |
gfz        174 |     0.2     -0.3     -0.9 |     1.4      1.5      4.1 |
jpl        113 |    -0.5     -0.3      0.1 |     1.7      1.6      7.2 |
MIT        134 |    -0.4      0.0     -0.4 |     1.9      1.9      5.3 |
ngs         77 |    -2.5      0.0      0.4 |     3.3      4.6      9.3 |
sio        161 |    -0.3      0.2      0.5 |     1.7      2.0      4.1 |
mit        233 |    -0.0      0.0     -0.4 |     0.6      0.7      3.2 |
ncl        156 |     0.0     -0.0      0.1 |     0.7      0.6      3.1 |
ITR         92 |    -0.8      0.1      0.1 |     2.3      2.3      7.1 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        135 |     0.6     -0.2     -1.1 |     2.6      2.6     11.6 |
emr         43 |     0.2     -0.5     -0.5 |     2.8      2.7      9.4 |
esa         68 |    -3.2     -0.1     -0.2 |     2.7      2.9     12.4 |
gfz        161 |     0.8     -0.4     -1.7 |     2.8      2.8      8.2 |
jpl        103 |    -0.0     -0.5     -0.1 |     2.5      2.8      8.9 |
MIT        118 |     0.1     -0.1     -1.3 |     2.8      2.4      9.3 |
ngs         78 |    -1.8      0.1      0.4 |     4.0      5.4     11.4 |
sio        149 |     0.4      0.1     -0.1 |     2.7      3.1      7.3 |
mit        180 |     0.7     -0.2     -1.2 |     2.8      2.3      8.1 |
ncl        149 |     0.7     -0.3     -0.6 |     2.4      2.3      7.0 |
igs        183 |     0.5     -0.1     -0.9 |     2.1      2.1      7.0 |
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            |   0.013    0.050    0.021      7.9     13.3    -20.4     1.91 |
emr            |  -0.033   -0.006   -0.007      2.4     16.8      2.7     3.31 |
esa            |   0.010    0.023   -0.017      1.5      7.4     -2.8     2.31 |
gfz            |   0.053    0.032    0.049     -0.3      2.6     -3.7     1.80 |
jpl            |   0.002    0.057    0.013      3.9      6.4     -6.7     1.20 |
MIT            |   0.197   -0.039   -0.013      3.4      6.3      4.8     4.14 |
ngs            |   0.029    0.216   -0.170    -18.4     14.9     19.1     1.79 |
sio            |   0.124   -0.090    0.073      9.3      7.4     30.7     2.55 |
mit            |  -0.002    0.002    0.002     -0.4     -0.4     -1.8     2.59 |
ncl            |  -0.010   -0.061   -0.043      2.4      2.1     -6.5     2.72 |
---------------|---------------------------------------------------------------|

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            |   0.045    0.045    0.050      1.2      1.2      1.1     0.18 |
emr            |   0.069    0.071    0.077      1.8      1.8      1.8     0.28 |
esa            |   0.050    0.052    0.055      1.3      1.3      1.3     0.21 |
gfz            |   0.042    0.042    0.047      1.1      1.1      1.1     0.17 |
jpl            |   0.050    0.049    0.056      1.3      1.3      1.3     0.20 |
MIT            |   0.046    0.047    0.052      1.2      1.2      1.2     0.19 |
ngs            |   0.045    0.045    0.052      1.2      1.2      1.2     0.18 |
sio            |   0.042    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            |   0.042    0.042    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            |    -3.6      8.1      0.6 |     1.8      1.9      4.5 |
---------------|---------------------------|---------------------------|

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            |     ---        9.1      -1.9       ---      -4.4       --- |
emr            |     ---       12.2       0.3       8.6      -6.7      -5.6 |
esa            |     ---        9.7       1.3       ---      -5.2       --- |
gfz            |     ---        3.2       3.3     -15.0       7.1      -4.0 |
jpl            |     ---      -22.3      -1.3      -7.6      -4.7       7.3 |
MIT            |     ---       -2.0       1.1       0.5       1.8      -0.0 |
ngs            |     ---      -17.9      -6.3       ---      23.1       --- |
sio            |     ---      -16.1      -3.2       2.6       1.9      -2.6 |
mit            |     ---       20.3       2.3       0.2       5.3      -0.4 |
ncl            |     ---        8.0      -1.0       ---       6.6       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       -3.2      -1.5      -0.6      30.4      -1.4 |
---------------|------------------------------------------------------------|

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

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---        3.1       2.3       ---       0.7       --- |
emr            |     ---        6.8       3.5      13.9       1.8      12.6 |
esa            |     ---        6.5       4.7       ---       2.0       --- |
gfz            |     ---        4.7       1.7      12.7       1.8       5.8 |
jpl            |     ---       23.5       3.9      32.5       1.7      10.9 |
MIT            |     ---        9.7       2.2       5.8       1.1       4.0 |
ngs            |     ---       41.6      13.4       ---       9.1       --- |
sio            |     ---        6.5       5.2       5.0       1.4       5.5 |
mit            |     ---        7.3       1.9       4.6       1.1       3.0 |
ncl            |     ---        2.7       1.5       ---       0.7       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       16.9       3.4       5.7       2.9       5.7 |
---------------|------------------------------------------------------------|

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

Thresholds set at 5 sigmas and 50 mm.

 Solution             Solution           |  Station   |    N       E       U  |
              Minus                      |code id soln|   (mm)    (mm)    (mm)|
-----------------------------------------|------------|-----------------------|
                                         |            |                       |
cod12557.snx         jpl12557.snx        |DWH1  A ----|   -0.7    -0.6   -51.6|
                                         |            |                       |
IGS04P03.snx         esa12557.snx        |KIRU  A ----|   -4.3     2.3   -75.7|
                                         |            |                       |
IGS04P03.snx         gfz12557.snx        |FAIR  A    2|   -2.3   -12.0     9.3|
IGS04P03.snx         gfz12557.snx        |HNPT  A ----|   21.7    -2.0    -9.5|
                                         |            |                       |
IGS04P03.snx         jpl12557.snx        |KIRU  A ----|   -3.7    -0.5   -61.6|
                                         |            |                       |
IGS04P03.snx         sio12557.snx        |KIRU  A ----|   -3.2     1.3   -45.5|
                                         |            |                       |
IGS04P03.snx         ncl1255g.snx        |KIRU  A ----|   -2.1     0.5   -47.0|
                                         |            |                       |
IGS04P03.snx         igs04P1255.snx      |NETT  A ----|    9.4   -38.7   -35.3|
                                         |            |                       |
IGS04P04.snx         igs04P1255.snx      |FAIR  A    2|   -1.4    -9.6    -0.3|
IGS04P04.snx         igs04P1255.snx      |YSSK  A ----|    9.7    -3.5     9.9|
-----------------------------------------|------------|-----------------------|

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 TID2 A TIDB A        TIDB A TIDB A TIDB A TIDB A TID2 A TIDB A TIDB A
              TID1 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
    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
    24201M001               ULAB A        ULAB A                      ULAB A ULAB A
 
MISSING IERS DOMES NOS AT MIT:
-----------------------------
  HLFX A  PALM A  PUR3 A  PUR2 A  UPO1 A  OUSD A  HORN A  NETT A  CNCL A  QUAR A
  KARA A  MAR6 A  IENG A
 
MISSING IERS DOMES NOS AT gfz:
-----------------------------
  BISH A  PALM A
 
MISSING IERS DOMES NOS AT sio:
-----------------------------
  PUR2 A  CONZ A  OUSD A  CNCL A  KARA 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
              TID2 A TIDB A
              TID1 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               IRKJ A
              MDVJ A 
    10422M001 KIR0 A               KR0G A
    10403M002 KIRU A KIRU A KIRU A KIRU A
 
MISSING IERS DOMES NOS AT mit:
-----------------------------
  BISH A
--