[IGSREPORT-11444] Wk 1274 IGS SINEX Combination

Remi Ferland ferland at geod.nrcan.gc.ca
Thu Jun 24 19:35:08 PDT 2004


******************************************************************************
IGS Electronic Report   24 Jun 19:35:14 PDT 2004      Message Number 11444
******************************************************************************

Author:  R. Ferland , D. Hutchison

===================================================================
 Combined AC  solution for GPS week 1274 -  04/06/06 to 04/06/12
===================================================================

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

2) Products:
============
All products are available at cddisa.gsfc.nasa.gov

igs04P1274.snx  Combined weekly solution. 
igs04P1274.erp  Daily Earth Rotation Parameters.
igs00p02.erp    Daily Earth Rotation Parameters since GPS week 1013.
IGS04P23.snx    Cumulative Combined solution. 
igs04P1274.sum  This file.
igs04P1274.itr  Residuals between the AC and the IGb00 for the RF stations. 
igs04P1274.res  Residuals between the AC and the Combined Weekly solution.
IGS04P23.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 = igs04P1274.snx
     IGS = IGS04P23.snx

     MIT = mit12747.snx
     mit = mit1274g.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:
         After unconstraining:
             esa  MIZU

     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            | 164 |  78 |        23.195 |         0.998 |        23.150 |
emr            |  48 |  35 |         4.722 |         1.013 |         4.783 |
esa            |  70 |  61 |         9.811 |         0.973 |         9.549 |
gfz            | 186 |  86 |         8.671 |         0.949 |         8.229 |
jpl            | 125 |  62 |         5.839 |         0.934 |         5.451 |
MIT            | 134 |  67 |         2.419 |         0.954 |         2.307 |
ngs            |  83 |  82 |        25.795 |         1.000 |        25.805 |
sio            | 175 |  86 |         2.065 |         0.995 |         2.054 |
mit            | 278 |  87 |         1.529 |         0.976 |         1.493 |
ncl            | 160 |  89 |         2.829 |         0.801 |         2.265 |
igs            | 250 |  91 |         1.421 |         0.978 |         1.389 |
---------------|-----|-----|---------------|---------------|---------------|

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         78 |     0.1      0.0     -0.3 |     2.1      1.8     11.1 |
emr         35 |     1.3      0.3     -0.3 |     3.2      2.9     10.5 |
esa         61 |    -0.6      0.3      0.1 |     3.6      3.0     12.3 |
gfz         86 |    -0.0      0.1     -0.5 |     2.4      2.3      8.4 |
jpl         62 |    -0.2      0.1     -0.0 |     2.5      2.4     10.8 |
MIT         67 |     0.3      0.2      0.7 |     2.5      2.7      8.5 |
ngs         82 |    -0.6     -0.2     -0.3 |     4.2      5.4     10.5 |
sio         86 |    -0.3      0.1     -0.6 |     2.9      2.5      6.3 |
mit         87 |    -0.6      0.2      0.3 |     2.1      1.9      6.9 |
ncl         89 |    -0.2      0.1      0.2 |     2.1      1.9      6.8 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        164 |    -0.3     -0.1     -1.1 |     1.4      1.1      6.8 |
emr         48 |     1.1      0.4     -0.2 |     1.9      1.8      6.2 |
esa         70 |    -1.0      0.2     -0.6 |     3.2      2.2     13.3 |
gfz        180 |    -0.3     -0.0     -0.4 |     1.3      1.3      4.8 |
jpl        125 |     0.2      0.3      0.6 |     1.7      1.4      9.1 |
MIT        118 |     0.2      0.0     -0.0 |     1.3      1.4      4.7 |
ngs         83 |    -0.7     -0.4     -0.2 |     3.4      5.3      8.1 |
sio        163 |    -0.2      0.1     -0.2 |     2.3      2.4      6.0 |
mit        243 |    -0.6      0.1      0.1 |     0.6      0.6      2.4 |
ncl        159 |    -0.3     -0.0      0.0 |     0.5      0.5      2.4 |
ITR         90 |    -0.3     -0.1     -0.3 |     2.0      2.0      6.6 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        130 |    -0.4      0.1     -0.9 |     2.0      1.7     10.6 |
emr         45 |     1.0      0.3     -0.5 |     3.0      2.6      9.5 |
esa         69 |    -0.9      0.2     -1.1 |     3.5      2.8     14.3 |
gfz        159 |    -0.3      0.1     -0.3 |     2.2      2.1      7.4 |
jpl        103 |     0.1      0.2      0.9 |     2.6      2.2     11.6 |
MIT        105 |     0.3      0.0      0.5 |     2.1      2.5      7.5 |
ngs         83 |    -0.8     -0.4      0.1 |     3.7      5.2     10.2 |
sio        145 |    -0.3      0.2      0.2 |     2.5      2.8      5.9 |
mit        178 |    -0.6      0.2      0.4 |     1.7      1.7      6.4 |
ncl        145 |    -0.4      0.1      0.4 |     1.7      1.7      6.0 |
igs        183 |     0.0      0.1      0.3 |     1.7      1.7      6.0 |
ITR         94 |    -0.3      0.0     -0.2 |     0.7      0.6      2.3 |
---------------|---------------------------|---------------------------|

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    0.021   -0.027      7.4      5.4     29.2     2.94 |
emr            |  -0.010   -0.020   -0.026     -7.9     11.8     27.5     3.83 |
esa            |   0.000   -0.042    0.010      5.2     10.5     -0.1     2.50 |
gfz            |   0.027   -0.003    0.000     -0.3      1.1     -2.5     1.98 |
jpl            |   0.107   -0.047    0.079     -9.3      7.8      1.0     1.13 |
MIT            |   0.140   -0.011   -0.074     -1.3      3.2      1.3     3.98 |
ngs            |  -0.108    0.157   -0.026     -4.8     -0.5     27.1     2.75 |
sio            |  -0.034    0.068   -0.028      1.9      1.5     22.6     2.45 |
mit            |  -0.010   -0.001   -0.011     -0.9     -0.7     -0.8     2.74 |
ncl            |   0.036   -0.018   -0.044      0.4      2.4      1.4     2.68 |
---------------|---------------------------------------------------------------|

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    0.046    0.050      1.2      1.2      1.2     0.18 |
emr            |   0.066    0.070    0.072      1.8      1.7      1.7     0.27 |
esa            |   0.048    0.052    0.055      1.3      1.3      1.3     0.20 |
gfz            |   0.042    0.044    0.048      1.1      1.1      1.1     0.17 |
jpl            |   0.049    0.051    0.056      1.3      1.3      1.3     0.20 |
MIT            |   0.047    0.049    0.056      1.3      1.2      1.2     0.20 |
ngs            |   0.043    0.044    0.050      1.1      1.1      1.1     0.18 |
sio            |   0.042    0.044    0.048      1.1      1.1      1.1     0.17 |
mit            |   0.042    0.044    0.049      1.1      1.1      1.1     0.17 |
ncl            |   0.042    0.043    0.048      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            |    -1.6      0.4     19.5 |     1.7      1.8      3.5 |
---------------|---------------------------|---------------------------|

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            |     ---      -11.3      -2.8       ---      -8.4       --- |
emr            |     ---        9.4      -1.9      -6.3      -3.2      14.3 |
esa            |     ---       -1.8       5.6       ---       4.9       --- |
gfz            |     ---       -0.5       3.6      -6.9       5.7      -3.1 |
jpl            |     ---        2.2       0.6     -16.4      -2.0      15.8 |
MIT            |     ---        2.3       1.3       1.4       1.7       0.2 |
ngs            |     ---      -13.6     -17.6       ---      34.2       --- |
sio            |     ---        4.3       0.4      -1.1       0.6      -0.9 |
mit            |     ---       29.7       1.4       1.0       4.7       0.4 |
ncl            |     ---       17.3     -10.7       ---       2.0       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---        1.4      -0.2      -1.8      33.1      -1.4 |
---------------|------------------------------------------------------------|

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

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---       11.2       1.4       ---       2.8       --- |
emr            |     ---        6.6       3.6       4.2       2.9      19.3 |
esa            |     ---       12.1       2.4       ---       4.1       --- |
gfz            |     ---        8.0       2.7       9.8       2.5       9.8 |
jpl            |     ---       35.8       1.9      13.6       1.9      12.7 |
MIT            |     ---        5.3       3.0       6.7       1.9       7.9 |
ngs            |     ---       51.3      15.4       ---       9.7       --- |
sio            |     ---        5.7       3.0       4.5       1.6       6.4 |
mit            |     ---        4.7       2.6       4.8       2.3       4.0 |
ncl            |     ---        1.9       1.1       ---       0.8       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       15.9       3.6       9.7       5.0       9.1 |
---------------|------------------------------------------------------------|

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

Thresholds set at 5 sigmas and 50 mm.

 Solution             Solution           |  Station   |    N       E       U  |
              Minus                      |code id soln|   (mm)    (mm)    (mm)|
-----------------------------------------|------------|-----------------------|
                                         |            |                       |
igs04P1273.snx       cod12747.snx        |ZWEN  A    2|   -6.9   -16.8    -2.5|
                                         |            |                       |
igs04P1273.snx       esa12747.snx        |ZWEN  A    2|   -3.5   -26.9    10.1|
                                         |            |                       |
igs04P1273.snx       gfz12747.snx        |ZWEN  A    2|   -8.7   -24.5    -3.7|
                                         |            |                       |
igs04P1273.snx       MIT12747.snx        |ZWEN  A    2|   -6.1   -24.0    -9.7|
                                         |            |                       |
igs04P1273.snx       sio12747.snx        |ZWEN  A    2|   -8.0   -23.3    -3.7|
                                         |            |                       |
igs04P1273.snx       mit1274g.snx        |ZWEN  A    2|   -6.9   -23.7    -4.6|
                                         |            |                       |
igs04P1273.snx       ncl1274g.snx        |ZWEN  A    2|   -7.3   -23.6    -6.2|
                                         |            |                       |
IGS04P22.snx         cod12747.snx        |IRKJ  A ----|   -2.4     1.3   -27.5|
-----------------------------------------|------------|-----------------------|

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

IERS DOMES NO    MIT    cod    emr    esa    gfz    jpl    ngs    sio    IGS    igs
============= ====== ====== ====== ====== ====== ====== ====== ====== ====== ======
    43001M003 THU3 A 
    43001M002        THU2 A        THU3 A THU3 A        THU3 A THU2 A THU3 A THU3 A
                                                               THU3 A
    40405S038 GOL2 A 
    40405S031        GOLD A        GOLD A GOLD A        GOLD B GOL2 A GOLD A GOLD A
    50103M113 TID2 A 
    50103M108 TIDB A TIDB A TID2 A TIDB A TIDB A TID1 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 DARR A
                                                 DARW A                      DARW A
    22003M001 PIMO A PIMO A PIMO A PIMO B PIMO A PIMO A        PIMO A PIMO A PIMO A
    50107M007 YAR2 A 
    50107M004        YAR2 A        YAR2 A YAR2 A YAR2 A        YAR2 A YAR1 A YAR1 A
                                                                      YAR2 A YAR2 A
    66010M001 DAV1 A DAVR A DAVR A DAV1 A DAV1 A DAV1 A DAV1 A DAV1 A DAV1 A DAV1 A
                                                 DAVR A                      DAVR A
    22306M002 IISC A IISC A IISC A IISC B IISC A IISC A IISC B IISC A IISC A IISC A
    10422M001        KIR0 A                      KIR0 A                      KIR0 A
                                                                             KR0G A
    21704S006               KGN0 A        KGN0 A                      KGN0 A KGN0 A
 
MISSING IERS DOMES NOS AT MIT:
-----------------------------
  CASC A  HLFX A  PUR3 A  DNRC A  MIA3 A  KYW1 A  MCD1 A  ELEN A  ARP3 A  LASC A
  UPO1 A  OUSD A  MTJO A  HORN A  NETT A  CNCL A  QUAR A  KARA A  TVST A  KAYT A
  SAMP A  MAR6 A
 
MISSING IERS DOMES NOS AT gfz:
-----------------------------
  BISH A  PALM A
 
MISSING IERS DOMES NOS AT sio:
-----------------------------
  KULU A  PUR2 A  SG21 A  DOAR A  OUSD A  CNCL A  KARA A  MERS A  CAVA A  SFEL A
  VOLT A  BRAS A
IERS DOMES NO    mit    ncl    IGS    igs
============= ====== ====== ====== ======
    43001M002 THU2 A THU3 A THU3 A THU3 A
    50103M108 TIDB A TID1 A TIDB A TIDB A
                     TID2 A
                     TIDB A
    50134M002 DARR A 
    50134M001 DARW A DARR A DARW A DARR A
                     DARW A        DARW A
    66010M001 DAV1 A DAV1 A DAV1 A DAV1 A
                     DAVR A        DAVR A
    34601M001 ZAMB A ZAMB A ZAMB A ZAMB A
 
MISSING IERS DOMES NOS AT mit:
-----------------------------
  PALM A  BISH A
--






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