Subject: [IGSREPORT-11517] Wk 1277 IGS SINEX Combination
From: Remi Ferland <[email-masked]>
To: [email-masked] (IGS Report Mailbox)
Cc: [email-masked] (gendt), [email-masked] (nisn)
Date: Thu, 15 Jul 2004 15:00:25 EDT

******************************************************************************
IGS Electronic Report   15 Jul 12:00:30 PDT 2004      Message Number 11517
******************************************************************************

Author:  R. Ferland , D. Hutchison

===================================================================
 Combined AC  solution for GPS week 1277 -  04/06/27 to 04/07/03
===================================================================

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

igs04P1277.snx  Combined weekly solution. 
igs04P1277.erp  Daily Earth Rotation Parameters.
igs00p02.erp    Daily Earth Rotation Parameters since GPS week 1013.
IGS04P26.snx    Cumulative Combined solution. 
igs04P1277.sum  This file.
igs04P1277.itr  Residuals between the AC and the IGb00 for the RF stations. 
igs04P1277.res  Residuals between the AC and the Combined Weekly solution.
IGS04P26.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
 
The products can also be found for a short period at:
ftp	macs.geod.nrcan.gc.ca
cd	/pub/requests/sinex/1277

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 = igs04P1277.snx
     IGS = IGS04P26.snx

     BuA = IERS Bulletin A

     gfz ngs excluded from the geocenter estimation (Sec. 5-4).

     Solutions with manual station deletion:
         After unconstraining:
             esa  MIZU
             ngs  TRO1

     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            | 163 |  77 |        26.061 |         0.998 |        26.001 |
emr            |  51 |  37 |         4.204 |         0.999 |         4.201 |
esa            |  70 |  60 |        11.872 |         0.994 |        11.803 |
gfz            | 178 |  88 |         8.815 |         0.996 |         8.777 |
jpl            | 124 |  60 |         5.543 |         0.998 |         5.532 |
MIT            | 145 |  71 |         2.707 |         0.996 |         2.697 |
ngs            |  78 |  77 |        23.477 |         1.000 |        23.471 |
sio            | 175 |  87 |         2.068 |         0.998 |         2.063 |
igs            | 247 |  91 |         1.525 |         1.005 |         1.533 |
---------------|-----|-----|---------------|---------------|---------------|

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         77 |     0.2      0.1     -0.3 |     2.2      2.0     12.1 |
emr         37 |     0.3      0.2     -0.1 |     3.4      3.0      9.6 |
esa         60 |    -0.5      0.3     -0.1 |     3.5      2.9     11.2 |
gfz         88 |     0.5      0.1     -0.2 |     2.9      2.8      9.8 |
jpl         60 |     0.8      0.1     -0.2 |     2.5      2.6     11.4 |
MIT         71 |     0.2      0.2      0.5 |     3.0      2.7      8.6 |
ngs         77 |    -0.7      0.2     -0.3 |     4.2      4.2     10.9 |
sio         87 |    -0.3      0.2     -0.5 |     3.1      2.8      7.1 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        163 |    -0.3      0.0     -1.4 |     1.5      1.3      7.3 |
emr         51 |     0.2      0.1     -0.6 |     1.6      1.8      4.2 |
esa         70 |    -0.9      0.2     -0.1 |     3.1      2.3     12.4 |
gfz        175 |     0.4      0.0     -0.2 |     1.2      1.1      5.0 |
jpl        123 |     0.8      0.4     -0.6 |     1.5      1.7      8.4 |
MIT        132 |    -0.1     -0.1     -0.1 |     1.6      1.6      4.1 |
ngs         78 |    -0.7      0.1     -0.6 |     3.1      3.9      8.1 |
sio        163 |    -0.2      0.1     -0.2 |     1.8      2.4      5.9 |
ITR         90 |    -0.3     -0.3     -0.8 |     2.5      2.3      8.0 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        130 |    -0.2      0.2     -1.0 |     2.7      1.9     11.0 |
emr         47 |     0.2      0.3      0.2 |     2.6      2.6      7.4 |
esa         69 |    -0.4     -0.1      0.6 |     4.4      3.0     11.7 |
gfz        159 |     0.5      0.3      0.4 |     2.9      2.4      8.0 |
jpl        104 |     1.0      0.4      1.3 |     2.9      2.6     10.3 |
MIT        114 |     0.1     -0.1      1.2 |     3.0      2.5      6.9 |
ngs         78 |    -0.9      0.1     -0.0 |     3.7      3.9     10.2 |
sio        147 |    -0.2      0.2      0.2 |     3.0      2.9      6.2 |
igs        185 |     0.0      0.2      0.8 |     2.5      2.0      6.0 |
ITR         94 |    -0.3      0.0     -0.2 |     0.8      0.7      2.4 |
---------------|---------------------------|---------------------------|

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            |  -0.007    0.033   -0.032      5.0      1.8      4.7     2.98 |
emr            |  -0.015   -0.019   -0.016    -16.6     -4.1      0.1     3.62 |
esa            |  -0.013   -0.024    0.015     -3.1      8.6    -13.0     2.57 |
gfz            |   0.020   -0.001   -0.003     -0.6      0.4     -2.8     1.76 |
jpl            |   0.110   -0.055    0.064     -6.2     -2.1     -2.8     1.24 |
MIT            |   0.182   -0.011   -0.058     -0.1      5.4     -6.0     3.94 |
ngs            |  -0.035    0.270   -0.119    -19.3      8.9     30.0     2.64 |
sio            |  -0.041    0.067   -0.013      2.4      1.3     21.2     2.50 |
---------------|---------------------------------------------------------------|

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            |   0.045    0.046    0.051      1.2      1.2      1.2     0.18 |
emr            |   0.064    0.064    0.070      1.7      1.7      1.7     0.26 |
esa            |   0.049    0.051    0.056      1.3      1.3      1.3     0.20 |
gfz            |   0.042    0.043    0.048      1.1      1.1      1.1     0.17 |
jpl            |   0.050    0.051    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            |   0.044    0.045    0.051      1.2      1.2      1.2     0.18 |
sio            |   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            |    -0.2      1.0     -1.7 |     3.6      3.6      4.8 |
---------------|---------------------------|---------------------------|

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            |     ---       12.6      -0.3       ---      -8.1       --- |
emr            |     ---       12.7       6.4       3.2       0.3      31.0 |
esa            |     ---        6.8       4.3       ---       4.0       --- |
gfz            |     ---      -19.7      -0.9       1.2       3.9      -8.8 |
jpl            |     ---       -0.8       4.0      -9.8      -2.2      10.5 |
MIT            |     ---       -7.2      -3.5       0.4       3.4      -0.2 |
ngs            |     ---      -21.7     -17.0       ---      44.9       --- |
sio            |     ---       -4.9      -0.8       3.9      -0.8      -7.6 |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---        1.6       0.6       0.6      27.6      -2.5 |
---------------|------------------------------------------------------------|

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

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---        6.6       1.3       ---       1.6       --- |
emr            |     ---       15.2       3.8      19.9       3.5      28.7 |
esa            |     ---       22.6       5.2       ---       5.6       --- |
gfz            |     ---        6.3       1.9       8.6       3.6      12.0 |
jpl            |     ---       23.2       2.0      12.7       2.6      12.1 |
MIT            |     ---        7.5       1.3       4.3       4.4       7.6 |
ngs            |     ---       52.4       6.9       ---       6.7       --- |
sio            |     ---       19.2       2.4       5.4       2.2       6.6 |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       36.2       3.6       6.1       4.9       8.1 |
---------------|------------------------------------------------------------|

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

Thresholds set at 5 sigmas and 50 mm.

 Solution             Solution           |  Station   |    N       E       U  |
              Minus                      |code id soln|   (mm)    (mm)    (mm)|
-----------------------------------------|------------|-----------------------|
                                         |            |                       |
IGS04P25.snx         jpl12777.snx        |ISPA  A ----|    0.5    -2.3   -42.4|
-----------------------------------------|------------|-----------------------|

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 THU3 A THU2 A THU3 A THU3 A
    40451M123 GODE A GODZ A        GODE A GODE A        GODE A GODE A GODE A GODE 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        TID2 A TIDB A TIDB A TID2 A TIDB A TID2 A TIDB A TIDB A
                                          TID1 A               TIDB A
                                          TID2 A 
    50134M001 DARW A DARR A        DARW A DARW A DARR A DARW A DARW A DARW A DARR A
                                                 DARW A                      DARW A
    66010M001 DAV1 A DAVR A        DAV1 A DAV1 A DAV1 A DAV1 A DAV1 A DAV1 A DAV1 A
    22306M002        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
    22003M001        PIMO A PIMO A PIMO B PIMO A PIMO A        PIMO A PIMO A PIMO A
    13102M001                      REDU A                                    REDU A
 
MISSING IERS DOMES NOS AT MIT:
-----------------------------
  CASC A  HLFX A  PALM A  PUR3 A  DNRC A  KYW1 A  LASC A  UPO1 A  OUSD A  MTJO A
  HORN A  NETT A  CNCL A  QUAR A  KARA A  TVST A  KAYT A  MAR6 A  IENG A
 
MISSING IERS DOMES NOS AT gfz:
-----------------------------
  PALM A
 
MISSING IERS DOMES NOS AT sio:
-----------------------------
  KULU A  SG21 A  DOAR A  OUSD A  CNCL A  KARA A  MERS A  CAVA A  SFEL A  VOLT A
  BRAS A
IERS DOMES NO    ---    IGS    IGS    IGS    IGS    NRC    MIT    ---    cod    emr    esa    gfz    igs    igs    jpl    ngs    sio    NRC    IGS    igs
============= ====== ====== ====== ====== ====== ====== ====== ====== ====== ====== ====== ====== ====== ====== ====== ====== ====== ====== ====== ======
    22306M002        IISC A IISC A IISC A IISC A IISC A               IISC A        IISC B IISC A IISC A IISC A IISC A IISC B IISC A IISC A IISC A IISC A
    50134M001        DARR A DARR A DARW A DARR A DARW A DARW A        DARR A        DARW A DARW A DARR A DARW A DARR A DARW A DARW A DARR A DARW A DARR A
                     DARW A DARW A                                                                DARW A        DARW A               DARW A        DARW A
    66010M001        DAV1 A DAV1 A DAV1 A DAV1 A DAV1 A DAV1 A        DAVR A        DAV1 A DAV1 A DAV1 A DAV1 A DAV1 A DAV1 A DAV1 A DAV1 A DAV1 A DAV1 A
                     DAVR A DAVR A                                                                                                   DAVR A
    40451M123        GODE A GODE A GODE A GODE A GODE A GODE A        GODZ A        GODE A GODE A GODE A GODE A        GODE A GODE A GODE A GODE A GODE A
                     GODZ A GODZ A                                                                                                   GODZ A
    40405S031        GOL2 A GOL2 A GOLD A GOL2 A GOLD A               GOLD A        GOLD A GOLD A GOLD A GOLD A        GOLD B GOL2 A GOL2 A GOLD A GOLD A
                     GOLD A GOLD A                                                                                                   GOLD A
    10422M001        KIR0 A KIR0 A        KIR0 A                      KIR0 A                      KIR0 A KR0G A KIR0 A               KIR0 A        KIR0 A
                     KR0G A KR0G A                                                                KR0G A                             KR0G A        KR0G A
    13407S012        MAD2 A MADR A MADR A MADR A                                           MADR A MADR A MADR A MADR A        MADR A MADR A MADR A MADR A
                     MADR A
    40513S001        MANZ A MANZ A        MANZ A                                                                                     MANZ A
 
MISSING IERS DOMES NOS AT MIT:
-----------------------------
  CASC A  HLFX A  PALM A  PUR3 A  DNRC A  KYW1 A  LASC A  UPO1 A  OUSD A  MTJO A
  HORN A  NETT A  CNCL A  QUAR A  KARA A  TVST A  KAYT A  MAR6 A  IENG A
 
MISSING IERS DOMES NOS AT gfz:
-----------------------------
  PALM A
 
MISSING IERS DOMES NOS AT sio:
-----------------------------
  KULU A  SG21 A  DOAR A  OUSD A  CNCL A  KARA A  MERS A  CAVA A  SFEL A  VOLT A
  BRAS A
--