[IGSREPORT-14030] Wk 1381 IGS SINEX Combination

Martin Bourassa mbourass at nrcan.gc.ca
Thu Jul 13 21:03:42 PDT 2006


******************************************************************************
IGS Electronic Report   13 Jul 21:03:45 PDT 2006      Message Number 14030
******************************************************************************

Author:  R. Ferland , M. Bourassa

===================================================================
 Combined AC  solution for GPS week 1381 -  06/06/25 to 06/07/01
===================================================================

1) Contacts:
============
e-mail: RFerland at NRCan.gc.ca
Tel:    (613)995-4002 (Remi Ferland)
Fax:    (613)995-3215

2) Products:
============
All products are available at
  CDDIS (cddis.gsfc.nasa.gov) and SOPAC (garner.ucsd.edu)

igs06P1381.snx  Combined weekly solution. 
igs06P1381.erp  Daily Earth Rotation Parameters.
igs00p02.erp    Daily Earth Rotation Parameters since GPS week 1013.
IGS06P26.snx    Cumulative Combined solution. 
igs06P1381.sum  This file.
igs06P1381.itr  Residuals between the AC and the IGb00 for the RF stations. 
igs06P1381.res  Residuals between the AC and the Combined Weekly solution.
IGS06P26.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 = igs06P1381.snx
     IGS = IGS06P26.snx

     MIT = mit13817.snx
     mit = mit1381g.snx

     BuA = IERS Bulletin A

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

     Solutions with manual station deletion:
         After unconstraining:
             esa  KOKB  MCM4  NTUS
             jpl  ASPA

     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            | 170 |  66 |        23.541 |         1.000 |        23.547 |
emr            |  42 |  29 |         5.979 |         1.000 |         5.980 |
esa            |  64 |  47 |        35.006 |         1.000 |        35.006 |
gfz            | 181 |  75 |         5.540 |         1.000 |         5.541 |
jpl            | 115 |  47 |         5.901 |         1.001 |         5.904 |
MIT            | 145 |  62 |         2.580 |         1.000 |         2.580 |
ngs            | 159 |  75 |        37.586 |         1.000 |        37.593 |
sio            | 174 |  71 |         2.138 |         1.000 |         2.138 |
mit            | 265 |  72 |         1.159 |         1.000 |         1.159 |
ncl            | 170 |  76 |         2.293 |         1.001 |         2.294 |
igs            | 250 |  77 |         1.477 |         1.000 |         1.477 |
---------------|-----|-----|---------------|---------------|---------------|

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         66 |     1.2      0.2     -1.0 |     4.1      4.7     15.1 |
emr         29 |    -1.1      0.2      0.4 |     3.6      3.9     15.1 |
esa         47 |     0.8      0.2     -0.3 |     4.1      4.1      9.1 |
gfz         75 |     0.6      0.2     -0.3 |     4.2      4.4     14.5 |
jpl         47 |     0.7      0.4     -0.3 |     4.2      4.3     15.9 |
MIT         62 |    -0.5      0.4      0.6 |     4.0      3.8     13.3 |
ngs         75 |    -0.7      0.3     -0.2 |     4.3      4.8     14.8 |
sio         71 |     0.9      0.3      0.3 |     4.0      4.7     13.8 |
mit         72 |     0.7      0.2      0.1 |     3.3      3.9     13.5 |
ncl         76 |     0.7      0.1      0.1 |     3.8      3.9     12.4 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        167 |     0.3      0.3     -1.7 |     1.8      1.4      4.7 |
emr         42 |    -1.3     -0.2      1.5 |     2.1      2.7      6.8 |
esa         63 |    -1.1      0.7     -0.2 |     7.3      6.8     12.7 |
gfz        177 |     0.2     -0.3     -0.8 |     0.8      0.9      4.4 |
jpl        113 |    -0.4      0.5      0.2 |     1.9      3.2      9.0 |
MIT        133 |    -1.1      0.2     -0.6 |     1.8      2.0      4.0 |
ngs        155 |    -1.1     -1.2      0.1 |     2.3      3.5      7.6 |
sio        168 |     0.5      0.1     -1.3 |     1.6      2.1      3.9 |
mit        239 |     0.0     -0.1     -0.1 |     1.2      0.9      2.7 |
ncl        167 |     0.3     -0.1      0.2 |     0.7      0.6      2.2 |
ITR         76 |    -0.6     -0.4     -1.6 |     3.7      4.3     13.1 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        159 |     1.0      0.4     -2.3 |     2.8      2.8      8.6 |
emr         41 |    -1.6     -0.4      1.9 |     2.5      2.9      9.4 |
esa         62 |    -0.7      0.6     -1.2 |     7.1      6.6     10.1 |
gfz        166 |     0.9      0.0     -1.3 |     2.5      2.4      8.6 |
jpl        106 |     0.4      0.2     -0.3 |     3.2      3.7     11.1 |
MIT        130 |    -0.5      0.1     -0.4 |     2.8      2.3      7.2 |
ngs        146 |    -0.2     -1.0     -0.3 |     3.1      4.1     10.1 |
sio        157 |     1.1      0.2     -1.5 |     2.5      3.1      8.0 |
mit        211 |     0.7      0.1     -0.6 |     2.5      2.3      7.3 |
ncl        158 |     0.9     -0.1      0.1 |     2.2      2.2      6.5 |
igs        219 |     0.5      0.1     -0.5 |     2.1      2.3      6.7 |
ITR         85 |    -0.6     -0.0     -1.2 |     2.3      2.5      7.4 |
---------------|---------------------------|---------------------------|

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            |   0.026   -0.004   -0.002      8.8     -5.3     -3.8     3.66 |
emr            |   0.009   -0.009   -0.080    -14.3     -2.3    -10.4     3.99 |
esa            |  -0.008   -0.016   -0.001     -1.0     -0.4     -8.6     2.25 |
gfz            |   0.051   -0.034   -0.013     -1.5      2.0     -6.0     2.86 |
jpl            |   0.190   -0.015    0.072     -1.5      0.4     -2.9     1.68 |
MIT            |  -0.004   -0.006   -0.010     -6.0     -3.8    -13.9     4.07 |
ngs            |  -0.076    0.054   -0.001    -10.1     -7.4    -21.9     3.96 |
sio            |  -0.025   -0.050   -0.010      0.9     -5.2     -9.2     4.11 |
mit            |  -0.020    0.033   -0.013     -2.8     -1.5     -2.0     3.34 |
ncl            |   0.105   -0.009    0.018     -2.1      0.2     -6.3     3.18 |
igs            |   0.000    0.000    0.000      0.0      0.0      0.0     3.27 |
---------------|---------------------------------------------------------------|

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            |   0.051    0.051    0.055      1.3      1.3      1.3     0.20 |
emr            |   0.073    0.071    0.087      1.9      1.9      1.9     0.29 |
esa            |   0.055    0.057    0.065      1.5      1.5      1.5     0.23 |
gfz            |   0.046    0.046    0.053      1.2      1.2      1.2     0.19 |
jpl            |   0.057    0.056    0.067      1.5      1.5      1.5     0.23 |
MIT            |   0.050    0.050    0.057      1.3      1.3      1.3     0.20 |
ngs            |   0.046    0.046    0.053      1.2      1.2      1.2     0.19 |
sio            |   0.048    0.047    0.054      1.2      1.2      1.2     0.19 |
mit            |   0.047    0.048    0.055      1.2      1.2      1.2     0.19 |
ncl            |   0.046    0.046    0.053      1.2      1.2      1.2     0.19 |
igs            |   0.000    0.000    0.000      0.0      0.0      0.0     0.94 |
---------------|---------------------------------------------------------------|

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

               |      X        Y        Z  |    s X      s Y      s Z  |
               |    (mm)     (mm)     (mm) |    (mm)     (mm)     (mm) |
---------------|---------------------------|---------------------------|
igs            |    -0.5     -2.7     -5.3 |     3.3      3.4      4.9 |
---------------|---------------------------|---------------------------|

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            |     ---      -18.3      -1.5       ---      -5.7       --- |
emr            |     ---      -12.3       3.7      -9.9      -4.4      24.8 |
esa            |     ---      -39.3       6.5       ---       0.3       --- |
gfz            |     ---       -3.2       0.9      -3.2       2.0       7.7 |
jpl            |     ---       73.6       2.2      11.3      -6.5       3.2 |
MIT            |     ---        4.2       0.2      -0.3       5.8      -1.1 |
ngs            |     ---      -21.1       3.9       2.9       8.1      -1.8 |
sio            |     ---       25.9      -2.3       1.0       3.7       1.2 |
mit            |     ---       10.8      -1.5      -0.9       5.5      -0.9 |
ncl            |     ---        3.4       2.4       ---       2.6       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---      -16.5       3.2      -1.6      34.7       0.6 |
---------------|------------------------------------------------------------|

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

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---        6.7       1.6       ---       1.7       --- |
emr            |     ---        7.2       1.9      12.7       2.9      11.4 |
esa            |     ---        7.0       3.2       ---       4.2       --- |
gfz            |     ---        9.4       1.2       9.6       1.4       8.8 |
jpl            |     ---       61.9       1.2      13.1       1.2       5.6 |
MIT            |     ---        5.3       2.3       6.6       1.9       3.2 |
ngs            |     ---       12.0       5.9      27.5       8.2      25.0 |
sio            |     ---        3.3       2.4       5.3       3.1      12.6 |
mit            |     ---        8.1       1.4       5.4       1.4       2.7 |
ncl            |     ---        2.0       0.6       ---       0.7       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       10.4       3.4       9.2       4.2       6.7 |
---------------|------------------------------------------------------------|

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

Thresholds set at 5 sigmas and 50 mm.

 Solution             Solution           |  Station   |    N       E       U  |
              Minus                      |code id soln|   (mm)    (mm)    (mm)|
-----------------------------------------|------------|-----------------------|
                                         |            |                       |
IGS03P33_RS99.snx    cod13817.snx        |RIOG  A ----|    4.1     4.2   -33.7|
IGS03P33_RS99.snx    cod13817.snx        |THU3  A ----|    4.4     6.0   -31.8|
                                         |            |                       |
IGS03P33_RS99.snx    MIT13817.snx        |JAB1  A ----|  -12.5     4.7    12.0|
                                         |            |                       |
IGS03P33_RS99.snx    sio13817.snx        |DRAO  A ----|    7.8     5.8    21.8|
IGS03P33_RS99.snx    sio13817.snx        |HOFN  A    2|    3.0    -7.3   -25.4|
IGS03P33_RS99.snx    sio13817.snx        |THU3  A ----|    6.2     2.3   -31.1|
                                         |            |                       |
IGS03P33_RS99.snx    mit1381g.snx        |AUCK  A ----|   -1.7   -10.8     3.7|
IGS03P33_RS99.snx    mit1381g.snx        |JAB1  A ----|  -10.7     2.4    11.7|
                                         |            |                       |
IGS03P33_RS99.snx    ncl1381g.snx        |DRAO  A ----|    5.4     5.4    20.5|
                                         |            |                       |
IGS06P25.snx         cod13817.snx        |JAMA  A ----|   14.9    -9.3    12.1|
                                         |            |                       |
IGS06P25.snx         gfz13817.snx        |JAMA  A ----|   18.4   -12.7     7.8|
                                         |            |                       |
IGS06P25.snx         jpl13817.snx        |JAMA  A ----|   16.5   -12.8    10.7|
                                         |            |                       |
IGS06P25.snx         MIT13817.snx        |JAMA  A ----|   16.9   -14.9     6.5|
IGS06P25.snx         MIT13817.snx        |SUNM  A ----|   -0.7    -1.7    67.2|
                                         |            |                       |
IGS06P25.snx         ngs13817.snx        |OUS2  A ----|   -3.3   -10.7    53.6|
                                         |            |                       |
IGS06P25.snx         sio13817.snx        |JAMA  A ----|   15.2   -17.3     4.3|
                                         |            |                       |
IGS06P25.snx         mit1381g.snx        |JAMA  A ----|   16.7   -13.4     5.6|
IGS06P25.snx         mit1381g.snx        |NTUS  A    2|    1.6   -25.7    -5.6|
IGS06P25.snx         mit1381g.snx        |OUS2  A ----|   -3.2    -9.6    58.3|
IGS06P25.snx         mit1381g.snx        |SUNM  A ----|   -1.1    -5.0    52.2|
                                         |            |                       |
IGS06P25.snx         ncl1381g.snx        |DWH1  A ----|   14.7    -1.2    11.3|
IGS06P25.snx         ncl1381g.snx        |JAMA  A ----|   16.7   -13.3     9.1|
                                         |            |                       |
IGS06P25.snx         igs06P1381.snx      |DWH1  A ----|   14.3    -1.3     4.2|
IGS06P25.snx         igs06P1381.snx      |KOUR  A ----|    6.6     3.3    12.4|
IGS06P25.snx         igs06P1381.snx      |MSKU  A ----|   11.3    -3.7     3.1|
-----------------------------------------|------------|-----------------------|

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

IERS DOMES NO    MIT    cod    emr    esa    gfz    jpl    ngs    sio    IGS    igs
============= ====== ====== ====== ====== ====== ====== ====== ====== ====== ======
    43001M002        THU2 A THU3 A THU3 A THU3 A THU3 A THU3 A THU2 A THU3 A THU3 A
                     THU3 A
    42202M005 AREQ A AREQ A AREQ A AREQ A AREQ A AREQ A AREQ B AREQ A AREQ A AREQ A
    40451M123 GODE A GODZ A        GODE A GODE A        GODE A GODE A GODE A GODE A
    50103M108 TIDB A        TIDB A TIDB A TIDB A TID2 A TIDB A TID2 A TIDB A TIDB A
                                          TID1 A               TIDB A
                                          TID2 A 
    50134M002 DARR A 
    50134M001 DARW A DARR A DARW A DARW A DARW A DARR A DARW A DARW A DARW A DARW A
                                                 DARW A
    22003M001 PIMO A PIMO A PIMO A PIMO B PIMO A PIMO A PIMO A PIMO A PIMO A PIMO A
    12313M002        IRKJ A                             IRKJ A MDVJ A IRKJ A IRKJ A
    22306M002 IISC A IISC A IISC A IISC B IISC A IISC A IISC B IISC A IISC A IISC A
    43005M002        KELY B        KELY B KELY B KELY B KELY B KELY B KELY A KELY A
    10422M001        KIR0 A                      KIR0 A               KR0G A KR0G A
    20703S001        RAMO A               RAMO A RAMO A RAMO A        ELRO A RAMO A
                                                                      RAMO A 
    40146S001        UNB1 A                                           UNB1 A UNB1 A
 
MISSING IERS DOMES NOS AT MIT:
-----------------------------
  HLFX A  PALM A  PUR3 A  DNRC A  KYW1 A  LASC A  UPO1 A  OUSD A  MTJO A  CNCL A
  QUAR A  KARA A  SAMP A  IENG A
 
MISSING IERS DOMES NOS AT gfz:
-----------------------------
  PALM A
 
MISSING IERS DOMES NOS AT ngs:
-----------------------------
  MCN1 A
 
MISSING IERS DOMES NOS AT sio:
-----------------------------
  KULU A  OUSD A  CNCL A  KARA A  BRAS A
IERS DOMES NO    mit    ncl    IGS    igs
============= ====== ====== ====== ======
    13407S014 MAD2 A 
    13407S012 MADR A MAD2 A MADR A MADR A
                     MADR A
    43005M002 KELY B KELY B KELY A KELY A
    43001M002 THU2 A THU3 A THU3 A THU3 A
    40451M123 GODZ A GODE A GODE A GODE A
              GODE A 
    50103M108 TIDB A TID2 A TIDB A TIDB A
                     TIDB A
    50134M002 DARR A 
    50134M001 DARW A DARR A DARW A DARW A
                     DARW A
    20703S001 RAMO A RAMO A ELRO A RAMO A
                            RAMO A 
    12336M001 POLV A        POLV A POLV A



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