Subject: [IGSREPORT-13009] Wk 1340 IGS SINEX Combination
From: "Martin Bourassa" <[email-masked]>
To: [email-masked]
Cc: [email-masked], [email-masked]
Date: Thu, 29 Sep 2005 23:19:11 -0400 (EDT)

******************************************************************************
IGS Electronic Report   29 Sep 20:19:17 PDT 2005      Message Number 13009
******************************************************************************

Author:  R. Ferland , D. Hutchison

===================================================================
 Combined AC  solution for GPS week 1340 -  05/09/11 to 05/09/17
===================================================================

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 and at garner.ucsd.edu

igs05P1340.snx  Combined weekly solution. 
igs05P1340.erp  Daily Earth Rotation Parameters.
igs00p02.erp    Daily Earth Rotation Parameters since GPS week 1013.
IGS05P37.snx    Cumulative Combined solution. 
igs05P1340.sum  This file.
igs05P1340.itr  Residuals between the AC and the IGb00 for the RF stations. 
igs05P1340.res  Residuals between the AC and the Combined Weekly solution.
IGS05P37.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 = igs05P1340.snx
     IGS = IGS05P37.snx

     MIT = mit13407.snx
     mit = mit1340g.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:
             cod  MANZ
             jpl  ASPA
             MIT  MANZ
             mit  MANZ

     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 |  71 |        22.614 |         1.000 |        22.625 |
emr            |  41 |  27 |         5.158 |         1.000 |         5.160 |
esa            |  68 |  52 |         9.267 |         0.999 |         9.257 |
gfz            | 181 |  75 |         3.976 |         1.001 |         3.978 |
jpl            | 111 |  44 |         5.685 |         1.007 |         5.726 |
MIT            | 141 |  63 |         2.361 |         0.997 |         2.354 |
ngs            | 143 |  76 |        40.350 |         1.001 |        40.406 |
sio            | 165 |  74 |         2.197 |         1.003 |         2.203 |
mit            | 265 |  75 |         1.047 |         1.003 |         1.051 |
ncl            | 164 |  78 |         1.746 |         0.868 |         1.515 |
igs            | 251 |  80 |         1.596 |         1.002 |         1.599 |
---------------|-----|-----|---------------|---------------|---------------|

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         71 |     1.1      0.2     -1.1 |     3.7      3.6     10.5 |
emr         27 |     1.0      0.2      0.4 |     3.8      3.4     11.8 |
esa         52 |     0.6      0.5     -0.3 |     3.3      2.5      9.2 |
gfz         75 |    -0.0      0.2     -0.1 |     3.7      3.9     10.5 |
jpl         44 |     0.7      0.1      0.4 |     4.1      4.0     12.3 |
MIT         63 |     1.7      0.1      0.4 |     3.5      3.7      9.7 |
ngs         76 |    -0.4      0.1      0.3 |     4.7      4.6     12.5 |
sio         74 |    -0.1      0.0      1.0 |     3.5      3.5      9.9 |
mit         75 |     0.7      0.2      0.3 |     3.1      3.5     10.0 |
ncl         78 |     0.7      0.2     -0.0 |     3.2      3.2      7.7 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        170 |     0.7      0.1     -1.0 |     1.6      1.5      5.0 |
emr         41 |     0.5     -0.6      0.5 |     1.8      2.4      4.5 |
esa         67 |    -0.5      0.1     -0.3 |     2.3      2.1     11.6 |
gfz        179 |    -0.7      0.1     -0.3 |     1.0      1.0      4.2 |
jpl        111 |    -0.1     -0.0      1.9 |     1.5      2.0      8.2 |
MIT        133 |     0.8     -0.3     -0.6 |     1.5      1.8      4.6 |
ngs        142 |    -0.7     -0.5     -0.3 |     2.5      3.6      8.0 |
sio        156 |    -0.5     -0.6     -0.1 |     1.7      2.0      6.3 |
mit        241 |     0.1      0.2     -0.2 |     0.8      0.6      2.6 |
ncl        163 |     0.2     -0.1      0.6 |     1.0      0.9      3.5 |
ITR         79 |    -0.6     -0.3     -1.0 |     3.2      3.5      9.0 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        161 |     0.8      0.4     -1.3 |     2.5      2.4      7.0 |
emr         39 |     0.8     -0.1      0.2 |     2.2      2.9      7.3 |
esa         65 |    -0.4      0.3     -1.0 |     2.9      2.1     11.4 |
gfz        171 |    -0.6      0.4     -0.2 |     2.2      2.4      6.6 |
jpl        102 |     0.3      0.4      1.6 |     2.7      3.2     10.1 |
MIT        126 |     0.9      0.1     -0.9 |     2.5      2.5      5.7 |
ngs        138 |    -0.5     -0.2     -0.3 |     3.4      4.5      9.6 |
sio        148 |    -0.5     -0.2     -0.2 |     2.4      2.4      8.7 |
mit        219 |     0.3      0.5     -0.5 |     2.0      2.1      5.4 |
ncl        156 |     0.3      0.2      0.7 |     2.1      2.1      5.1 |
igs        227 |     0.2      0.3     -0.2 |     1.9      2.0      5.0 |
ITR         86 |    -0.5     -0.0     -0.8 |     1.8      1.9      5.5 |
---------------|---------------------------|---------------------------|

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            |  -0.001   -0.001   -0.006      6.3     10.5      9.8     2.73 |
emr            |  -0.017   -0.001   -0.041     -5.9      5.4     -1.7     4.04 |
esa            |  -0.005   -0.015    0.002      0.6      2.9     -4.1     1.43 |
gfz            |   0.051   -0.017   -0.011     -1.1      1.5     -3.5     2.00 |
jpl            |   0.108   -0.061    0.115    -11.4      8.3     -1.8     1.07 |
MIT            |   0.002   -0.002    0.006     -6.7     11.7      3.7     3.21 |
ngs            |   0.094   -0.032   -0.007     -0.6      6.7    -10.3     3.55 |
sio            |  -0.049    0.090   -0.040     -2.9     -1.3     14.8    -2.05 |
mit            |  -0.002    0.027   -0.023     -2.3     -0.5     -1.6     2.54 |
ncl            |   0.017   -0.039   -0.009     -0.7      0.4     -2.8     1.89 |
igs            |   0.000    0.000    0.000      0.0      0.0      0.0     1.93 |
---------------|---------------------------------------------------------------|

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            |   0.048    0.048    0.053      1.2      1.2      1.2     0.19 |
emr            |   0.076    0.077    0.090      2.0      2.0      2.0     0.31 |
esa            |   0.053    0.055    0.060      1.4      1.4      1.4     0.22 |
gfz            |   0.047    0.046    0.051      1.2      1.2      1.2     0.19 |
jpl            |   0.059    0.059    0.066      1.5      1.5      1.5     0.24 |
MIT            |   0.050    0.050    0.056      1.3      1.3      1.3     0.20 |
ngs            |   0.046    0.046    0.052      1.2      1.2      1.2     0.19 |
sio            |   0.047    0.047    0.053      1.2      1.2      1.2     0.19 |
mit            |   0.046    0.047    0.053      1.2      1.2      1.2     0.19 |
ncl            |   0.046    0.046    0.051      1.2      1.2      1.2     0.18 |
igs            |   0.000    0.000    0.000      0.0      0.0      0.0     1.93 |
---------------|---------------------------------------------------------------|

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

               |      X        Y        Z  |    s X      s Y      s Z  |
               |    (mm)     (mm)     (mm) |    (mm)     (mm)     (mm) |
---------------|---------------------------|---------------------------|
igs            |    -1.8      5.5      5.3 |     3.3      3.4      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            |     ---        0.1       2.4       ---      -3.9       --- |
emr            |     ---       38.4       3.3      26.4      -2.1     -15.2 |
esa            |     ---       32.3      -0.0       ---       3.2       --- |
gfz            |     ---       -5.7      -1.3      15.9       4.1      -6.5 |
jpl            |     ---      -35.7      -1.6       9.9      -5.0     -22.5 |
MIT            |     ---       34.8       3.4       0.2      -7.6      -0.7 |
ngs            |     ---      -23.3      -0.7      29.9       8.9     -16.6 |
sio            |     ---        0.6       3.2      -1.4      -6.0       1.0 |
mit            |     ---       25.4      -0.8       0.2      -3.4      -0.1 |
ncl            |     ---        1.7       0.8       ---       1.5       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---      -21.0      -1.3       1.5      32.5      -0.8 |
---------------|------------------------------------------------------------|

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

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---        7.2       1.0       ---       1.5       --- |
emr            |     ---        7.8       4.0      11.6       4.4      21.4 |
esa            |     ---       27.3       3.9       ---       3.7       --- |
gfz            |     ---        7.3       1.3      10.1       1.8       6.8 |
jpl            |     ---        5.1       4.8      18.4       5.1      16.0 |
MIT            |     ---        6.3       3.6       8.5       2.0       4.2 |
ngs            |     ---       17.9       5.8      27.4       9.1      32.0 |
sio            |     ---        6.3       2.8       6.3       2.0       8.1 |
mit            |     ---        6.5       2.4       3.2       2.1       4.2 |
ncl            |     ---        2.0       1.1       ---       1.3       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       12.7       5.8       3.8       9.5       9.7 |
---------------|------------------------------------------------------------|

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    gfz13407.snx        |THU3  A ----|    4.3     3.1   -23.7|
                                         |            |                       |
IGS03P33_RS99.snx    MIT13407.snx        |JAB1  A ----|  -12.4     4.3    11.4|
                                         |            |                       |
IGS03P33_RS99.snx    mit1340g.snx        |JAB1  A ----|  -11.9     2.6     6.0|
                                         |            |                       |
jpl13407.snx         ncl1340g.snx        |TNML  A ----|    1.1    -2.9   -97.3|
                                         |            |                       |
MIT13407.snx         ncl1340g.snx        |TNML  A ----|    4.3    -3.0   -88.7|
                                         |            |                       |
sio13407.snx         ncl1340g.snx        |TNML  A ----|    4.1    -1.7   -84.5|
                                         |            |                       |
mit1340g.snx         ncl1340g.snx        |TNML  A ----|    4.3    -0.9   -92.3|
                                         |            |                       |
IGS05P36.snx         gfz13407.snx        |CNMR  A ----|  -27.0    33.9    -8.0|
                                         |            |                       |
IGS05P36.snx         ngs13407.snx        |CNMR  A ----|  -28.6    51.4    -1.6|
                                         |            |                       |
IGS05P36.snx         mit1340g.snx        |CNMR  A ----|  -26.7    37.8    -6.8|
-----------------------------------------|------------|-----------------------|

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

IERS DOMES NO    MIT    cod    emr    esa    gfz    jpl    ngs    sio    IGS    igs
============= ====== ====== ====== ====== ====== ====== ====== ====== ====== ======
    43001M003 THU3 A 
    43001M002               THU3 A THU3 A THU3 A THU3 A THU3 A THU2 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        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 DARR A DARW A DARW A DARW A DARW 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               KR0G A KR0G A
    20703S001        RAMO A               RAMO A RAMO A RAMO A        ELRO A RAMO A
                                                                      RAMO A 
 
MISSING IERS DOMES NOS AT MIT:
-----------------------------
  HLFX A  PALM A  PUR3 A  MIA3 A  KYW1 A  ELEN A  UPO1 A  OUSD A  MTJO A  HORN A
  CNCL A  QUAR A  KARA A  MAC1 B  MAR6 A  IENG A
 
MISSING IERS DOMES NOS AT gfz:
-----------------------------
  BISH A  PALM A
 
MISSING IERS DOMES NOS AT sio:
-----------------------------
  KULU A  SG21 A  OUSD A  CNCL A  KARA A  SAMP A  MERS A  VOLT A  BRAS A
IERS DOMES NO    mit    ncl    IGS    igs
============= ====== ====== ====== ======
    13407S014 MAD2 A 
    13407S012 MADR A MAD2 A MADR A MADR A
                     MADR 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 
 
MISSING IERS DOMES NOS AT mit:
-----------------------------
  KOD1 A  MAC1 B  BISH A