Subject: [IGSREPORT-9554] Wk 1179 IGS SINEX Combination
From: David Hutchison <[email-masked]>
To: [email-masked]
Date: Thu, 29 Aug 2002 20:54:47 EDT

******************************************************************************
IGS Electronic Report   29 Aug 17:54:50 PDT 2002      Message Number 9554
******************************************************************************

Author:  R. Ferland , D. Hutchison

===================================================================
 Combined AC  solution for GPS week 1179 -  02/08/11 to 02/08/17
===================================================================

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

igs02P1179.snx  Combined weekly solution. 
igs02P1179.erp  Daily Earth Rotation Parameters.
igs00p02.erp    Daily Earth Rotation Parameters since GPS week 1013.
IGS02P33.snx    Cumulative Combined solution. 
igs02P1179.sum  This file.
igs02P1179.itr  Residuals between the AC and the IGS00 for the RF stations. 
igs02P1179.res  Residuals between the AC and the Combined Weekly solution.
IGS02P33.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
     IGS00 stations at the current epoch.
     ftp://igscb.jpl.nasa.gov/igscb/station/coord/IGS01P37_RS54.SNX.Z
3-4) The AC are compared to IGS00, 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 IGS00 of the current
     epoch using a 7-parameters transformation. The singular cumulative
     combined solution is aligned to the IGS00 of the reference epoch
     using a 14-parameters transformation and the 54 ITRF station positions
     and velocities. The IGS00 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 = IGS01P37_RS54.SNX
     igs = igs02P1179.snx
     IGS = IGS02P33.snx

     BuA = IERS Bulletin A

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

     Solutions with manual station deletion:
         After unconstraining:
             gfz  TID1
             jpl  KELY

     New stations in the cumulative solution IGS02P33.snx
                  LROC A ---- VENE A ----

     4-1) Starting with GPS week 1143, the solutions are aligned to the
     IGS01P37_RS54.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            | 142 |  44 |        23.612 |         1.001 |        23.626 |
emr            |  45 |  25 |         4.580 |         1.000 |         4.582 |
esa            |  54 |  34 |        10.209 |         1.000 |        10.212 |
gfz            | 138 |  42 |         8.134 |         1.002 |         8.150 |
jpl            |  91 |  28 |         4.488 |         1.000 |         4.489 |
ngs            |  75 |  47 |        22.475 |         1.000 |        22.482 |
sio            | 123 |  44 |         2.056 |         1.001 |         2.057 |
mit            | 183 |  44 |         2.286 |         1.186 |         2.711 |
igs            | 178 |  48 |         1.348 |         1.002 |         1.351 |
---------------|-----|-----|---------------|---------------|---------------|

5-2)      Solution Residuals weighted Average & STD :
=====================================================

5-2-1)    With respect to the IGS00 stations:
=============================================

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod         41 |     1.9      0.3      0.1 |     2.6      3.5     11.7 |
emr         24 |     0.1      0.3      0.9 |     2.5      2.7      9.5 |
esa         31 |     1.5     -0.6     -0.2 |     5.0      4.6     10.7 |
gfz         41 |    -0.1      0.5     -1.0 |     2.8      3.6      8.9 |
jpl         27 |     0.6      0.6      1.1 |     2.6      3.3     10.3 |
ngs         45 |     1.4      0.8     -0.4 |     6.3      4.5      9.9 |
sio         43 |    -1.0      0.6     -1.5 |     3.8      3.6     11.8 |
mit         43 |     0.6      0.2     -0.3 |     2.5      2.4      8.4 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        139 |     2.1     -0.5     -0.1 |     1.7      1.9      8.3 |
emr         45 |     0.5      0.1      0.5 |     1.7      1.8      5.6 |
esa         53 |     1.2     -1.8      1.1 |     4.5      4.6     10.0 |
gfz        137 |    -0.4      0.1     -0.1 |     1.3      1.4      4.8 |
jpl         90 |     0.2      0.8     -0.6 |     1.6      1.6      7.4 |
ngs         74 |     1.2      0.3      0.3 |     4.3      4.6      9.5 |
sio        118 |    -1.3      0.3      0.2 |     1.8      3.8     10.1 |
mit        171 |     0.9     -0.9      0.2 |     0.9      1.0      4.3 |
ITR         47 |    -0.5     -0.9      0.0 |     3.5      2.7      7.2 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        127 |     1.7      0.4     -2.0 |     2.5      3.0     11.0 |
emr         44 |     0.3      0.3     -0.1 |     2.2      2.9      9.1 |
esa         52 |     1.4     -1.0      0.4 |     5.3      4.5     11.2 |
gfz        118 |    -0.5      0.6     -0.7 |     2.5      2.6      7.7 |
jpl         77 |     0.3      1.3     -1.0 |     2.4      2.7     10.1 |
ngs         73 |     1.4      0.8     -0.6 |     6.1      4.6     11.4 |
sio        114 |    -1.4      1.0     -1.5 |     2.9      3.9     11.3 |
mit        144 |     0.6      0.0     -1.5 |     2.1      2.1      7.9 |
igs        150 |    -0.1      0.7     -1.4 |     2.2      2.0      6.7 |
ITR         54 |    -0.3     -0.4      0.0 |     1.0      1.2      2.3 |
---------------|---------------------------|---------------------------|

5-3)      7-Parameters Transformation: AC ----> IGS01P37_RS54.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            |   0.010   -0.007   -0.021      5.2     14.0     -3.6     1.60 |
emr            |  -0.020   -0.052   -0.028     -8.3     15.6     -4.4     0.69 |
esa            |   0.087    0.323   -0.307      5.2      2.2     -1.5     0.02 |
gfz            |  -0.018   -0.007    0.015     -1.1      1.5     -0.4     0.74 |
jpl            |  -0.018    0.018   -0.095    -12.3      6.6     -2.7     0.62 |
ngs            |   0.116   -0.140   -0.081     -5.2      1.4    -52.9     1.16 |
sio            |   0.229    0.100    0.273      6.2     15.6     26.1     0.66 |
mit            |   0.012    0.008    0.011     -1.0      1.0     -1.5     1.10 |
---------------|---------------------------------------------------------------|

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            |   0.062    0.061    0.069      1.6      1.6      1.6     0.25 |
emr            |   0.080    0.079    0.093      2.1      2.1      2.1     0.33 |
esa            |   0.076    0.075    0.080      2.0      2.0      1.9     0.30 |
gfz            |   0.061    0.061    0.072      1.6      1.6      1.6     0.25 |
jpl            |   0.075    0.076    0.088      2.0      1.9      2.0     0.31 |
ngs            |   0.059    0.058    0.068      1.5      1.5      1.5     0.24 |
sio            |   0.060    0.060    0.067      1.6      1.6      1.5     0.24 |
mit            |   0.059    0.059    0.071      1.6      1.6      1.6     0.24 |
---------------|---------------------------------------------------------------|

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

               |      X        Y        Z  |    s X      s Y      s Z  |
               |    (mm)     (mm)     (mm) |    (mm)     (mm)     (mm) |
---------------|---------------------------|---------------------------|
igs            |     2.6      9.1     -9.7 |     2.2      1.8      4.4 |
---------------|---------------------------|---------------------------|

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            |     ---       -7.5      -3.3       ---      -6.9       --- |
emr            |     ---       -5.9       2.9      25.8       -.8       2.1 |
esa            |     ---       -6.0       1.1       ---     -18.3       --- |
gfz            |     ---        -.2       4.2      -7.5       1.2      -4.5 |
jpl            |     ---       -2.1       1.1      -8.3       1.3      17.8 |
ngs            |     ---       22.7      -3.3      51.1      24.7       9.2 |
sio            |     ---       14.7      -2.7       2.0       7.7      -6.7 |
mit            |     ---      -90.6       2.7       1.7       3.5      -1.4 |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       -4.7      -2.2       1.8      24.3      -5.2 |
---------------|------------------------------------------------------------|

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

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---        4.9       2.3       ---       2.4       --- |
emr            |     ---        6.8       5.4      13.4       4.4      23.6 |
esa            |     ---       12.2       3.0       ---       5.6       --- |
gfz            |     ---        6.7       2.6      11.3       1.7      15.2 |
jpl            |     ---       28.2       2.3      18.2       3.3       7.1 |
ngs            |     ---       66.1       7.8      47.7      13.7      73.0 |
sio            |     ---        9.8       2.2       8.3       3.3      10.9 |
mit            |     ---      153.5       1.9       5.3       2.1      14.2 |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       10.0       4.2      11.9       4.9      16.6 |
---------------|------------------------------------------------------------|

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

Thresholds set at 5 sigmas and 50 mm.

 Solution             Solution           |  Station   |    N       E       U  |
              Minus                      |code id soln|   (mm)    (mm)    (mm)|
-----------------------------------------|------------|-----------------------|
                                         |            |                       |
IGS01P37_RS54.snx    cod11797.snx        |GUAM  A ----|   20.1   -11.8     1.4|
                                         |            |                       |
IGS01P37_RS54.snx    emr11797.snx        |GUAM  A ----|   17.6    -6.2    17.1|
                                         |            |                       |
IGS01P37_RS54.snx    esa11797.snx        |CHAT  A ----|    1.3     0.2   -86.3|
IGS01P37_RS54.snx    esa11797.snx        |MCM4  A ----|    0.4    -8.4    50.7|
                                         |            |                       |
IGS01P37_RS54.snx    gfz11797.snx        |GUAM  A ----|   17.1    -7.7    14.9|
                                         |            |                       |
IGS01P37_RS54.snx    jpl11797.snx        |GUAM  A ----|   16.7    -5.7    23.6|
                                         |            |                       |
IGS01P37_RS54.snx    mit1179g.snx        |GUAM  A ----|   19.1    -8.1    11.2|
                                         |            |                       |
IGS01P37_RS54.snx    mit1179g.snx        |MALI  A ----|    7.6   -14.2   -14.9|
                                         |            |                       |
cod11797.snx         esa11797.snx        |NLIB  A ----|    3.8     0.3   -57.9|
cod11797.snx         esa11797.snx        |RIOG  A ----|   10.4    -2.5    52.1|
                                         |            |                       |
cod11797.snx         ngs11797.snx        |BAKO  A ----|   -2.1     9.0   -80.4|
cod11797.snx         ngs11797.snx        |NLIB  A ----|   -4.0     0.2   -59.2|
                                         |            |                       |
cod11797.snx         sio11797.snx        |BJFS  A ----|    1.4     4.4    52.4|
                                         |            |                       |
esa11797.snx         sio11797.snx        |AREQ  A    2|  -11.0    -4.7    85.0|
                                         |            |                       |
gfz11797.snx         ngs11797.snx        |BAKO  A ----|    4.9     6.4   -72.6|
                                         |            |                       |
ngs11797.snx         sio11797.snx        |BAKO  A ----|   -0.3    -3.4    80.3|
                                         |            |                       |
ngs11797.snx         mit1179g.snx        |BAKO  A ----|    1.2    -8.8    80.9|
                                         |            |                       |
IGS02P32.snx         cod11797.snx        |HOLM  A ----|   16.1    -4.7    92.7|
                                         |            |                       |
IGS02P32.snx         gfz11797.snx        |PALM  A ----| -716.6   249.7  -742.9|
                                         |            |                       |
IGS02P32.snx         gfz11797.snx        |GENO  A ----|  -28.8   -38.4    11.2|
IGS02P32.snx         gfz11797.snx        |SIO3  A ----|   -1.1     3.3  -130.9|
                                         |            |                       |
IGS02P32.snx         gfz11797.snx        |BARH  A ----|    4.6    13.1   -17.4|
IGS02P32.snx         gfz11797.snx        |KELY  A ----|   -1.9     3.1    50.1|
IGS02P32.snx         gfz11797.snx        |MBAR  A ----|   13.7     1.9    -3.2|
                                         |            |                       |
IGS02P32.snx         jpl11797.snx        |LHUE  A ----|   31.0   181.5   238.2|
                                         |            |                       |
IGS02P32.snx         mit1179g.snx        |PALM  A ----| -712.7   250.9  -744.7|
                                         |            |                       |
IGS02P32.snx         mit1179g.snx        |LHUE  A ----|   32.2   179.8   238.1|
IGS02P32.snx         mit1179g.snx        |TID1  A ----| -111.4   -40.1     4.6|
                                         |            |                       |
IGS02P32.snx         mit1179g.snx        |HOLM  A ----|   12.7    -4.1    91.6|
IGS02P32.snx         mit1179g.snx        |SIO3  A ----|    0.9     4.0  -130.4|
                                         |            |                       |
IGS02P32.snx         mit1179g.snx        |GENO  A ----|  -27.7   -41.4    10.7|
IGS02P32.snx         mit1179g.snx        |HERS  A ----|   -1.5     9.5     9.8|
IGS02P32.snx         mit1179g.snx        |MBAR  A ----|   14.1     0.8     1.7|
                                         |            |                       |
IGS02P32.snx         igs02P1179.snx      |HERS  A ----|   -2.8    11.0     3.3|
IGS02P32.snx         igs02P1179.snx      |MBAR  A ----|   13.7     1.0     2.8|
-----------------------------------------|------------|-----------------------|

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

5-7-1) Station Name Conflicts:
============================= 

IERS DOMES NO    cod    emr    esa    gfz    jpl    ngs    sio    IGS    igs
============= ====== ====== ====== ====== ====== ====== ====== ====== ======
    42005M001 GALA A GALA A GALA B GALA A GALA A GALA B GALA A GALA A GALA A
    40405S031 GOLD A               GOLD A        GOL2 A GOL2 A GOLD A GOLD A
    22306M002 IISC A IISC A IISC B IISC A IISC A IISC B IISC A IISC A IISC A
    13407S012 MADR A               MADR A MAD2 A MADR A MAD2 A MADR A MADR A
    40114M001 NRC1 A NRC1 A NRC1 A NRC1 A NRC1 A        NRC1 A NRC1 A NRC1 A
                     NRC2 A                                                 
    30314M002 SUTH A        SUTH B SUTH A        SUTH A        SUTH A SUTH A
    50103M108 TIDB A TIDB A TIDB A TIDB A TIDB A TID2 A TID2 A TIDB A TIDB A
                            TID2 A TID1 A                                   
                                   TID2 A                                   
    50107M004 YAR2 A                      YAR2 A               YAR1 A YAR1 A
 
MISSING IERS DOMES NOS AT gfz:
-----------------------------
  PMON A  PALM A
 
MISSING IERS DOMES NOS AT sio:
-----------------------------
  ZAMB A  CAVA A  SFEL A  VOLT A

IERS DOMES NO    mit    IGS    igs
============= ====== ====== ======
    13407S012 MADR A MADR A MADR A
              MAD2 A              
    40114M001 NRC1 A NRC1 A NRC1 A
              NRC2 A              
    40405S031 GOLD A GOLD A GOLD A
              GOL2 A              
    50103M108 TIDB A TIDB A TIDB A
              TID1 A              
              TID2 A              
    50107M004 YAR2 A YAR1 A YAR1 A
 
MISSING IERS DOMES NOS AT mit:
-----------------------------
  PALM A  PMON A  ZAMB A  CAVA A  SFEL A  VOLT A

5-7-2) Station Antenna Conflicts:
================================ 

 _______________________ 
|Enforcing these aliases|
|_______________________|
   YAR1 A: YAR2 A  
   SUTH A: SUTH B  
   GALA A: GALA B  
   IISC A: IISC B  
   TIDB A: TID2 A  TID1 A  
   MADR A: MAD2 A  
   GOLD A: GOL2 A  

ABBREVIATIONS:
-------------
    L1: L1 Offset
    L2: L2 Offset
   ECC: Eccentricity
    -N: NORTH (Latitude) 
    -E: EAST  (Longitude)
    -U: UP    (Vertical) 

Compare to file IGS.SNX (IGS).                

Antenna Conflicts in file esa11797.snx (esa).           
------- --------- -- ---- 
    STN       L1-U   L1-N   L1-E   L2-U   L2-N   L2-E  ECC-U  ECC-N  ECC-E
AGY CODE PT   (M.)   (M.)   (M.)   (M.)   (M.)   (M.)   (M.)   (M.)   (M.)
=== ==== ==   ====   ====   ====   ====   ====   ====   ====   ====   ====
esa NYAL  A  .0780  .0000  .0000  .0960  .0000  .0000 5.2160  .0000  .0000
IGS NYAL  A  .0780  .0000  .0000  .0960  .0000  .0000 5.2160  .0040 -.0010

Antenna Conflicts in file gfz11797.snx (gfz).           
------- --------- -- ---- 
    STN       L1-U   L1-N   L1-E   L2-U   L2-N   L2-E  ECC-U  ECC-N  ECC-E
AGY CODE PT   (M.)   (M.)   (M.)   (M.)   (M.)   (M.)   (M.)   (M.)   (M.)
=== ==== ==   ====   ====   ====   ====   ====   ====   ====   ====   ====
gfz NYAL  A  .0780  .0000  .0000  .0960  .0000  .0000 5.2160  .0000  .0000
IGS NYAL  A  .0780  .0000  .0000  .0960  .0000  .0000 5.2160  .0040 -.0010

Antenna Conflicts in file jpl11797.snx (jpl).           
------- --------- -- ---- 
    STN       L1-U   L1-N   L1-E   L2-U   L2-N   L2-E  ECC-U  ECC-N  ECC-E
AGY CODE PT   (M.)   (M.)   (M.)   (M.)   (M.)   (M.)   (M.)   (M.)   (M.)
=== ==== ==   ====   ====   ====   ====   ====   ====   ====   ====   ====
jpl NYAL  A  .0780  .0000  .0000  .0960  .0000  .0000 5.2160  .0000  .0000
IGS NYAL  A  .0780  .0000  .0000  .0960  .0000  .0000 5.2160  .0040 -.0010

Antenna Conflicts in file mit1179g.snx (mit).           
------- --------- -- ---- 
    STN       L1-U   L1-N   L1-E   L2-U   L2-N   L2-E  ECC-U  ECC-N  ECC-E
AGY CODE PT   (M.)   (M.)   (M.)   (M.)   (M.)   (M.)   (M.)   (M.)   (M.)
=== ==== ==   ====   ====   ====   ====   ====   ====   ====   ====   ====
mit NYAL  A  .0780  .0000  .0000  .0960  .0000  .0000 5.2160  .0000  .0000
IGS NYAL  A  .0780  .0000  .0000  .0960  .0000  .0000 5.2160  .0040 -.0010

Antenna Conflicts in file ngs11797.snx (ngs).           
------- --------- -- ---- 
    STN       L1-U   L1-N   L1-E   L2-U   L2-N   L2-E  ECC-U  ECC-N  ECC-E
AGY CODE PT   (M.)   (M.)   (M.)   (M.)   (M.)   (M.)   (M.)   (M.)   (M.)
=== ==== ==   ====   ====   ====   ====   ====   ====   ====   ====   ====
ngs BAKO  A  .0757  .0000  .0000  .0745  .0000  .0000 1.6160  .0000  .0000
IGS BAKO  A  .0780  .0000 -.0030  .0744 -.0031 -.0013 1.6160  .0000  .0000

ngs MCM4  A  .1100  .0000  .0000  .1280  .0000  .0000  .1830  .0000  .0000
IGS MCM4  A  .1100  .0000  .0000  .1280  .0000  .0000  .0814  .0000  .0000

ngs NYAL  A  .0780  .0000  .0000  .0960  .0000  .0000 5.2160  .0000  .0000
IGS NYAL  A  .0780  .0000  .0000  .0960  .0000  .0000 5.2160  .0040 -.0010

ngs WUHN  A  .1081  .0000  .0000  .1256  .0000  .0000 2.3200  .0000  .0000
IGS WUHN  A  .1100  .0000  .0000  .1280  .0000  .0000 2.3200  .0000  .0000

Antenna Conflicts in file sio11797.snx (sio).           
------- --------- -- ---- 
    STN       L1-U   L1-N   L1-E   L2-U   L2-N   L2-E  ECC-U  ECC-N  ECC-E
AGY CODE PT   (M.)   (M.)   (M.)   (M.)   (M.)   (M.)   (M.)   (M.)   (M.)
=== ==== ==   ====   ====   ====   ====   ====   ====   ====   ====   ====
sio BOR1  A  .1100  .0000  .0000  .1280  .0000  .0000  .0600  .0000  .0000
IGS BOR1  A  .1100  .0000  .0000  .1280  .0000  .0000  .0624  .0000  .0000

The following files have no antenna conflicts: 
   - cod11797.snx (cod)            
   - emr11797.snx (emr)            
--