Subject: [IGSREPORT-12090] Wk 1301 IGS SINEX Combination
From: "Martin Bourassa" <[email-masked]>
To: [email-masked]
Cc: [email-masked], [email-masked]
Date: Fri, 31 Dec 2004 03:18:43 -0500 (EST)

******************************************************************************
IGS Electronic Report   31 Dec 00:18:42 PST 2004      Message Number 12090
******************************************************************************

Author:  R. Ferland , D. Hutchison

===================================================================
 Combined AC  solution for GPS week 1301 -  04/12/12 to 04/12/18
===================================================================

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

igs04P1301.snx  Combined weekly solution. 
igs04P1301.erp  Daily Earth Rotation Parameters.
igs00p02.erp    Daily Earth Rotation Parameters since GPS week 1013.
IGS04P50.snx    Cumulative Combined solution. 
igs04P1301.sum  This file.
igs04P1301.itr  Residuals between the AC and the IGb00 for the RF stations. 
igs04P1301.res  Residuals between the AC and the Combined Weekly solution.
IGS04P50.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 = igs04P1301.snx
     IGS = IGS04P50.snx

     MIT = mit13017.snx
     mit = mit1301g.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).

     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 |  75 |        28.334 |         1.000 |        28.330 |
emr            |  49 |  36 |         9.609 |         1.000 |         9.611 |
esa            |  71 |  57 |         9.506 |         1.001 |         9.513 |
gfz            | 178 |  82 |        10.679 |         1.001 |        10.694 |
jpl            | 111 |  56 |         5.229 |         1.075 |         5.623 |
MIT            | 143 |  67 |         3.313 |         0.869 |         2.880 |
ngs            | 130 |  74 |        27.040 |         1.001 |        27.060 |
sio            | 172 |  82 |         2.814 |         1.004 |         2.824 |
mit            | 265 |  82 |         1.007 |         1.000 |         1.007 |
ncl            | 170 |  85 |         2.997 |         1.069 |         3.204 |
igs            | 244 |  85 |         1.357 |         1.032 |         1.400 |
---------------|-----|-----|---------------|---------------|---------------|

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         75 |     0.9      0.1     -0.5 |     3.0      3.2     12.2 |
emr         36 |    -0.8     -0.2      1.1 |     5.6      6.9     12.7 |
esa         57 |    -1.3      0.3      1.1 |     3.5      3.4     11.0 |
gfz         82 |    -0.5      0.2      0.2 |     2.9      3.3     11.7 |
jpl         56 |    -0.8     -0.1      0.2 |     2.9      3.1     11.6 |
MIT         67 |     0.8      0.0      1.0 |     2.7      3.0     10.5 |
ngs         74 |    -0.9     -0.4      0.0 |     3.8      5.2     11.9 |
sio         82 |     0.8      0.1     -0.4 |     3.5      3.7      9.1 |
mit         82 |     0.9      0.2     -0.0 |     2.6      3.0      9.2 |
ncl         85 |     0.9     -0.1      0.0 |     2.9      3.0      8.5 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        160 |    -0.1      0.4     -0.8 |     1.5      1.4      5.3 |
emr         48 |    -1.8     -0.0     -1.6 |     6.7      7.2     10.5 |
esa         68 |    -1.9      0.3      2.3 |     2.5      2.5     11.8 |
gfz        171 |    -1.5     -0.0     -0.3 |     1.4      1.6      4.4 |
jpl        108 |    -1.6     -0.8      0.1 |     2.3      2.8      8.2 |
MIT        128 |     0.1     -0.3      0.4 |     1.1      1.8      4.9 |
ngs        124 |    -1.7     -0.4     -1.6 |     2.1      3.8      7.4 |
sio        156 |     0.4     -0.2      0.4 |     2.3      2.0      6.6 |
mit        231 |     0.3      0.1      0.0 |     0.8      0.7      3.1 |
ncl        156 |    -0.1     -0.3      0.2 |     1.0      0.7      2.9 |
ITR         84 |    -0.7      0.0     -0.5 |     2.5      2.8     10.2 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        133 |     0.7      0.5     -0.8 |     2.9      2.8      9.3 |
emr         46 |    -1.2      0.0      0.5 |     6.9      7.4     10.8 |
esa         68 |    -1.6      0.2      2.1 |     3.3      3.3     11.1 |
gfz        158 |    -1.1      0.2     -0.1 |     2.4      2.7      8.2 |
jpl         92 |    -1.0     -0.4      1.1 |     2.9      3.2     10.7 |
MIT        112 |     0.5     -0.1      0.1 |     2.1      2.7      7.5 |
ngs        119 |    -1.1     -0.5     -1.7 |     3.2      5.2     10.4 |
sio        145 |     0.9     -0.2     -0.1 |     3.4      3.8      8.8 |
mit        176 |     0.6      0.2     -0.3 |     1.9      2.4      6.6 |
ncl        147 |     0.5     -0.1     -0.0 |     2.6      2.4      6.0 |
igs        180 |     0.4      0.2     -0.1 |     2.0      2.2      7.0 |
ITR         91 |    -0.4      0.0     -0.5 |     1.2      1.1      3.7 |
---------------|---------------------------|---------------------------|

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            |  -0.003    0.022   -0.018      9.9     14.0     -8.0     3.22 |
emr            |   0.037    0.188    0.182      1.9      6.0    -15.5     1.32 |
esa            |  -0.006   -0.019    0.021     -2.0      3.3      4.6     2.43 |
gfz            |   0.045   -0.054    0.027     -0.1      1.1     -5.4     2.42 |
jpl            |   0.126   -0.038    0.145     -6.3     13.6     -0.2     1.65 |
MIT            |   0.210   -0.059    0.038      0.5      7.0      8.5     3.76 |
ngs            |   0.022    0.009    0.012     -7.2     -1.3    -11.5     3.84 |
sio            |  -0.141    0.110   -0.003     10.3      4.2     58.5     3.26 |
mit            |   0.003    0.008   -0.015     -1.9     -0.4     -2.9     3.18 |
ncl            |   0.016   -0.023    0.020      0.2      1.0     -4.5     2.78 |
---------------|---------------------------------------------------------------|

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    0.047    0.052      1.2      1.2      1.2     0.19 |
emr            |   0.064    0.066    0.078      1.7      1.7      1.7     0.27 |
esa            |   0.051    0.053    0.058      1.3      1.3      1.3     0.21 |
gfz            |   0.043    0.045    0.049      1.1      1.1      1.1     0.18 |
jpl            |   0.052    0.053    0.057      1.4      1.3      1.4     0.21 |
MIT            |   0.047    0.049    0.054      1.2      1.2      1.2     0.19 |
ngs            |   0.044    0.047    0.051      1.2      1.2      1.2     0.18 |
sio            |   0.044    0.045    0.049      1.2      1.1      1.1     0.18 |
mit            |   0.043    0.045    0.050      1.2      1.1      1.1     0.18 |
ncl            |   0.042    0.044    0.049      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            |     1.7     10.3      2.4 |     3.5      3.6      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            |     ---       13.2      -3.5       ---      -1.5       --- |
emr            |     ---      -22.8     -20.9      -5.1      -7.7       5.6 |
esa            |     ---       30.0       9.6       ---      -0.4       --- |
gfz            |     ---        1.3       3.6      -7.8       4.6     -17.3 |
jpl            |     ---       -4.5      -2.8      -0.5       1.6      -5.7 |
MIT            |     ---       -4.7       0.3       1.7       1.0      -0.1 |
ngs            |     ---       -5.8       2.3      -4.2       9.7      -4.0 |
sio            |     ---       -9.2       2.2      -5.1       6.2      -2.7 |
mit            |     ---       11.1      -1.8       1.4       1.4      -1.0 |
ncl            |     ---        ---       ---       ---       ---       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       -1.9      -2.8       1.9      27.9      -1.4 |
---------------|------------------------------------------------------------|

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

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---        6.5       1.5       ---       1.9       --- |
emr            |     ---        8.5       2.1      12.4       4.3      12.4 |
esa            |     ---       10.1       3.6       ---       3.2       --- |
gfz            |     ---        5.6       0.9       8.1       1.6       8.6 |
jpl            |     ---       11.1       1.8      15.6       2.3      11.2 |
MIT            |     ---        7.1       3.0       7.2       1.8       6.5 |
ngs            |     ---       10.3       7.6      31.1       4.5      29.1 |
sio            |     ---        7.5       1.1       5.0       2.9       4.0 |
mit            |     ---        8.3       2.3       5.5       1.3       4.8 |
ncl            |     ---        ---       ---       ---       ---       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       12.5       4.0      11.6       3.6       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)|
-----------------------------------------|------------|-----------------------|
                                         |            |                       |
IGS03P33_RS99.snx    gfz13017.snx        |GOUG  A ----|   -0.9     5.3    55.6|
                                         |            |                       |
IGS03P33_RS99.snx    jpl13017.snx        |ALGO  A ----|   -2.5   -11.7    17.0|
                                         |            |                       |
IGS03P33_RS99.snx    MIT13017.snx        |MANA  A ----|   13.9     8.6     6.1|
                                         |            |                       |
IGS03P33_RS99.snx    mit1301g.snx        |MANA  A ----|   12.9     9.7     5.5|
                                         |            |                       |
gfz13017.snx         jpl13017.snx        |WUHN  A    2|    3.8     0.6   -50.0|
                                         |            |                       |
jpl13017.snx         sio13017.snx        |WUHN  A    2|    3.9    -0.6    53.7|
                                         |            |                       |
IGS04P49.snx         cod13017.snx        |YAKT  A ----|   20.5   -24.8   -11.7|
                                         |            |                       |
IGS04P49.snx         gfz13017.snx        |YAKT  A ----|   22.4   -25.0   -18.7|
                                         |            |                       |
IGS04P49.snx         gfz13017.snx        |RESO  A ----|   14.5     3.9    -0.7|
                                         |            |                       |
IGS04P49.snx         jpl13017.snx        |YAKT  A ----|   15.3   -19.2   -15.8|
                                         |            |                       |
IGS04P49.snx         MIT13017.snx        |TVST  A ----|  -21.0    -3.8   -42.1|
IGS04P49.snx         MIT13017.snx        |YAKT  A ----|   34.9   -32.5   -14.1|
                                         |            |                       |
IGS04P49.snx         ngs13017.snx        |YAKT  A ----|   29.4   -39.5     4.4|
                                         |            |                       |
IGS04P49.snx         sio13017.snx        |RESO  A ----|   17.0     8.0    -5.1|
                                         |            |                       |
IGS04P49.snx         mit1301g.snx        |YAKT  A ----|   24.6   -25.5   -13.7|
                                         |            |                       |
IGS04P49.snx         mit1301g.snx        |RESO  A ----|   15.1     6.2    -3.6|
IGS04P49.snx         mit1301g.snx        |TVST  A ----|  -20.2    -1.6   -37.8|
IGS04P49.snx         mit1301g.snx        |USUD  A ----|   11.8     0.6     6.0|
                                         |            |                       |
IGS04P49.snx         ncl1301g.snx        |YAKT  A ----|   26.0   -25.8    -9.0|
                                         |            |                       |
IGS04P49.snx         igs04P1301.snx      |ALGO  A ----|   -1.2    -7.2     7.8|
IGS04P49.snx         igs04P1301.snx      |IISC  A ----|   -0.9    -7.4    -1.6|
IGS04P49.snx         igs04P1301.snx      |MAG0  A ----|    7.4     9.8    -7.3|
IGS04P49.snx         igs04P1301.snx      |MANA  A ----|   10.8     8.3     3.2|
IGS04P49.snx         igs04P1301.snx      |USUD  A ----|   11.5     0.3     1.3|
-----------------------------------------|------------|-----------------------|

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
    42202M005 AREQ A AREQ A AREQ A AREQ A AREQ A AREQ A AREQ B AREQ A        AREQ A
    40451M123 GODE A GODE A        GODE A GODE A        GODE A GODE A        GODE A
                     GODZ A
    40405S038 GOL2 A 
    40405S031        GOLD A        GOLD A GOLD A        GOLD A GOL2 A        GOLD A
    50103M108                      TIDB A TIDB A        TIDB A TID2 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                      DARW A
    22003M001 PIMO A PIMO A PIMO A PIMO B PIMO A PIMO A PIMO A PIMO A        PIMO A
    66010M001 DAV1 A DAVR A        DAV1 A DAV1 A DAV1 A DAV1 A DAV1 A        DAV1 A
    22306M002 IISC A IISC A        IISC B IISC A IISC A IISC B IISC A
    10422M001        KIR0 A                                                  KR0G A
 
MISSING IERS DOMES NOS AT MIT:
-----------------------------
  HLFX A  PALM A  PUR3 A  ALGO B  MIA3 A  KYW1 A  ARP3 A  GUAX A  UPO1 A  OUSD A
  MTJO A  HORN A  CNCL A  QUAR A  KARA A  TVST A  KAYT A  MAR6 A  IENG A
 
MISSING IERS DOMES NOS AT gfz:
-----------------------------
  BISH A  PALM A
 
MISSING IERS DOMES NOS AT ngs:
-----------------------------
  CHUM 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    mit    ncl    IGS    igs
============= ====== ====== ====== ======
    43001M002 THU2 A THU3 A        THU3 A
    40451M123 GODE A GODE A        GODE A
              GODZ A 
    50103M108 TIDB A TID2 A        TIDB A
                     TIDB A
    50134M002 DARR A 
    50134M001 DARW A DARR A        DARW A
                     DARW A
    22003M001 PIMO A PIMO A        PIMO A
              PIMO B 
    10422M001 KIR0 A               KR0G A
 
MISSING IERS DOMES NOS AT mit:
-----------------------------
  ALGO B  BISH A