Subject: [IGSREPORT-8329] Wk 1115 IGS SINEX Combination
From: David Hutchison <[email-masked]>
To: [email-masked]
Date: Thu, 07 Jun 2001 18:13:14 EDT

******************************************************************************
IGS Electronic Report   07 Jun 15:13:18 PDT 2001      Message Number 8329
******************************************************************************

Author:  R. Ferland , D. Hutchison

===================================================================
 Combined AC  solution for GPS week 1115 -  01/05/20 to 01/05/26
===================================================================

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

igs01P1115.snx  Combined weekly solution. 
igs01P1115.erp  Daily Earth Rotation Parameters.
igs00p02.erp    Daily Earth Rotation Parameters since GPS week 1013.
IGS01P21.snx    Cumulative Combined solution. 
igs01P1115.sum  This file.
igs01P1115.itr  Residuals between the AC and the IGS97 for the RF stations. 
igs01P1115.res  Residuals between the AC and the Combined Weekly solution.
IGS01P21.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
     IGS97 stations at the current epoch.
     ftp://igscb.jpl.nasa.gov/igscb/station/coord/IGS00P04_RS51.SNX.Z
3-4) The AC are compared to IGS97, 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 IGS97 of the current
     epoch using a 7-parameters transformation. The singular cumulative
     combined solution is aligned to the IGS97 of the reference epoch
     using a 14-parameters transformation and the 51 ITRF station positions
     and velocities. The IGS97 is a realization of ITRF97.

     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 = IGS00P04_RS51.SNX
     igs = igs01P1115.snx
     IGS = IGS01P21.snx

     BuA = IERS Bulletin A

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

     Solutions with manual station deletion:
         After unconstraining:
             emr  NRC1  NRC2

     New stations in the cumulative solution IGS01P21.snx
                  HNLC A ---- MSKU A ----

     4-1) Starting with GPS week 1065, the solutions are aligned to the
     IGS00P04_RS51.SNX realization of ITRF97.

     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            | 127 |  40 |        33.333 |         1.001 |        33.358 |
emr            |  44 |  27 |         3.251 |         1.001 |         3.253 |
esa            |  59 |  37 |        12.904 |         1.000 |        12.903 |
gfz            |  75 |  36 |        12.200 |         1.001 |        12.210 |
jpl            |  75 |  29 |         4.130 |         1.001 |         4.134 |
ngs            |  69 |  43 |        22.293 |         1.000 |        22.304 |
sio            | 137 |  41 |         2.487 |         1.000 |         2.488 |
mit            | 157 |  41 |         4.491 |         1.000 |         4.492 |
ncl            | 102 |  43 |         2.605 |         1.044 |         2.720 |
igs            | 129 |  43 |         1.237 |         1.002 |         1.239 |
---------------|-----|-----|---------------|---------------|---------------|

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

5-2-1)    With respect to the IGS97 stations:
=============================================

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod         39 |     0.1      0.6      0.1 |     3.2      4.0     10.6 |
emr         26 |    -0.9      0.9      0.9 |     4.9      6.8      8.7 |
esa         36 |    -1.1      0.3     -0.2 |     7.8      5.3     16.4 |
gfz         35 |     0.5      0.2     -0.3 |     3.3      3.8      9.1 |
jpl         28 |     0.1      0.3      1.0 |     3.0      4.8     11.2 |
ngs         42 |    -1.7      0.9      0.0 |     5.7      7.6     14.4 |
sio         40 |    -0.6      0.8     -1.7 |     3.8      4.2     13.4 |
mit         40 |    -0.2      0.3     -1.0 |     3.1      3.4      9.3 |
ncl         42 |     0.4      0.1      0.1 |     2.9      3.8      7.3 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        111 |     0.6      0.4      2.7 |     1.8      1.7      8.7 |
emr         41 |    -0.9      0.3      0.7 |     3.1      5.2      6.7 |
esa         54 |    -1.2     -0.2     -0.6 |     5.9      4.2     10.1 |
gfz         66 |     0.2     -0.4      0.5 |     1.5      1.7      5.2 |
jpl         64 |     0.2      0.8      1.6 |     1.8      1.8      8.2 |
ngs         65 |    -1.4     -0.3      0.1 |     5.3      7.2     10.7 |
sio        114 |    -0.6      0.0      1.3 |     2.9      2.1      9.8 |
mit        122 |    -0.3      0.0      0.2 |     1.3      0.9      4.3 |
ncl         91 |     0.4     -0.3      1.9 |     0.9      1.1      3.3 |
ITR         42 |     0.1     -0.1      0.2 |     2.6      3.8     10.3 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        114 |     0.2      1.7      4.1 |     3.6      4.2      9.8 |
emr         42 |    -0.3      0.1      1.8 |     4.2      6.8      7.2 |
esa         57 |    -1.1      0.6      0.4 |     6.9      6.3     12.9 |
gfz         67 |     0.0      0.1      1.8 |     2.7      3.1      7.0 |
jpl         66 |     0.3      1.0      2.6 |     2.6      4.0     10.2 |
ngs         67 |    -1.3      0.0      1.7 |     6.3      8.3     11.7 |
sio        117 |    -0.8      0.9      2.7 |     3.7      4.9     11.3 |
mit        123 |    -0.6      1.1      1.5 |     3.1      3.0      7.1 |
ncl         94 |     0.1      0.5      3.1 |     2.7      3.2      5.5 |
igs        128 |    -0.2      0.7      1.4 |     2.3      2.8      5.9 |
ITR         51 |     0.0      0.0     -0.2 |     1.4      2.1      5.7 |
---------------|---------------------------|---------------------------|

5-3)      7-Parameters Transformation: AC ----> IGS00P04_RS51.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            |   0.092   -0.171    0.018     12.4      8.0      1.4     2.32 |
emr            |  -0.028    0.005   -0.013     20.1    -16.2     25.3     2.11 |
esa            |   0.067    0.061   -0.023    -10.8      5.9     21.9     1.99 |
gfz            |  -0.021   -0.017   -0.035     -1.6      0.5     -3.5     2.35 |
jpl            |  -0.038   -0.013   -0.081      7.1      4.6    -13.7     1.74 |
ngs            |  -0.044   -0.183    0.136     16.8     -0.9     -4.9     2.52 |
sio            |   0.048    0.014    0.084      7.0     10.1     55.4     1.61 |
mit            |  -0.016   -0.015   -0.020      0.3     -0.2     -0.4     2.34 |
ncl            |  -0.020    0.067   -0.253     13.4     -3.5     -7.2     1.76 |
---------------|---------------------------------------------------------------|

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            |   0.063    0.064    0.072      1.6      1.6      1.6     0.26 |
emr            |   0.076    0.076    0.088      2.0      2.0      2.0     0.31 |
esa            |   0.068    0.068    0.074      1.8      1.8      1.7     0.27 |
gfz            |   0.066    0.066    0.076      1.7      1.7      1.7     0.27 |
jpl            |   0.075    0.071    0.087      1.9      1.9      1.9     0.30 |
ngs            |   0.061    0.062    0.070      1.6      1.6      1.6     0.25 |
sio            |   0.063    0.063    0.071      1.6      1.6      1.6     0.25 |
mit            |   0.063    0.063    0.074      1.6      1.6      1.6     0.26 |
ncl            |   0.061    0.062    0.069      1.6      1.6      1.6     0.25 |
---------------|---------------------------------------------------------------|

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

               |      X        Y        Z  |    s X      s Y      s Z  |
               |    (mm)     (mm)     (mm) |    (mm)     (mm)     (mm) |
---------------|---------------------------|---------------------------|
igs            |    10.5      3.7     -7.9 |     2.2      2.3      7.1 |
---------------|---------------------------|---------------------------|

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            |     ---        6.7      -1.6       4.5       1.5        .3 |
emr            |     ---        9.5       4.3      22.9       6.9      11.7 |
esa            |     ---        7.5        .5       1.1     -16.7       3.9 |
gfz            |     ---      -14.6      11.3       7.1       4.5       -.1 |
jpl            |     ---       38.6      -2.7     -13.4       2.5       1.6 |
ngs            |     ---       -4.2     -18.2    -121.6      37.4     -28.1 |
sio            |     ---      -13.9      -2.4      -1.3       3.4      -1.0 |
mit            |     ---       -4.5      -6.2      -1.1      -3.4        .0 |
ncl            |     ---        ---       ---       ---       ---       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---         .0       6.4       1.9      36.7      -2.0 |
---------------|------------------------------------------------------------|

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

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---        6.1       6.5      10.7       6.4      11.9 |
emr            |     ---       11.3       7.4      24.9       8.6      14.6 |
esa            |     ---       15.0       5.5      21.4       5.7      13.4 |
gfz            |     ---        4.0       2.9       8.0       2.3       4.5 |
jpl            |     ---       11.3       3.2      10.3       4.3      13.6 |
ngs            |     ---       66.0      13.8     184.3      17.5      80.4 |
sio            |     ---       10.6       3.0       7.2       3.2       9.7 |
mit            |     ---       11.1       2.3       2.8       1.6       4.3 |
ncl            |     ---        ---       ---       ---       ---       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       16.0       5.1      10.7       4.4      16.7 |
---------------|------------------------------------------------------------|

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

Thresholds set at 5 sigmas and 50 mm.

 Solution             Solution           |  Station   |    N       E       U  |
              Minus                      |code id soln|   (mm)    (mm)    (mm)|
-----------------------------------------|------------|-----------------------|
                                         |            |                       |
cod11157.snx         ngs11157.snx        |BAKO  A ----|   -0.8     6.8   -52.5|
                                         |            |                       |
ngs11157.snx         mit1115g.snx        |BAKO  A ----|    0.0   -11.1    51.7|
                                         |            |                       |
ngs11157.snx         ncl1115g.snx        |BAKO  A ----|    0.0   -13.5    55.8|
                                         |            |                       |
IGS01P20.snx         emr11157.snx        |COCO  A ----|    7.8   -34.5    -0.2|
IGS01P20.snx         emr11157.snx        |SSIA  A ----|   29.6   -18.0     7.4|
                                         |            |                       |
IGS01P20.snx         gfz11157.snx        |COCO  A ----|    8.9   -26.4     2.2|
IGS01P20.snx         gfz11157.snx        |SSIA  A ----|   26.0   -19.3     4.3|
                                         |            |                       |
IGS01P20.snx         jpl11157.snx        |COCO  A ----|    8.9   -27.7     8.1|
                                         |            |                       |
IGS01P20.snx         jpl11157.snx        |SSIA  A ----|   28.6   -14.1     6.7|
                                         |            |                       |
IGS01P20.snx         mit1115g.snx        |COCO  A ----|   10.4   -26.3     4.9|
IGS01P20.snx         mit1115g.snx        |RAMO  A ----|   -1.2    17.1     0.7|
IGS01P20.snx         mit1115g.snx        |SSIA  A ----|   25.1   -18.6     1.7|
                                         |            |                       |
IGS01P20.snx         ncl1115g.snx        |COCO  A ----|   10.4   -29.7     5.5|
IGS01P20.snx         ncl1115g.snx        |SSIA  A ----|   27.9   -17.2     2.9|
                                         |            |                       |
IGS01P20.snx         igs01P1115.snx      |ANKR  A ----|   -9.6    12.0    -1.0|
IGS01P20.snx         igs01P1115.snx      |COCO  A ----|    9.2   -26.6     3.1|
IGS01P20.snx         igs01P1115.snx      |LAE1  A ----|    0.5    -9.0   -24.7|
IGS01P20.snx         igs01P1115.snx      |RAMO  A ----|   -0.5    15.8    -3.0|
IGS01P20.snx         igs01P1115.snx      |ZWEN  A ----|    9.7     8.2    -5.8|
-----------------------------------------|------------|-----------------------|

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

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

IERS DOMES NO    cod    emr    esa    gfz    jpl    ngs    sio    IGS    igs
============= ====== ====== ====== ====== ====== ====== ====== ====== ======
    30314M002 SUTH A SUTH A SUTH B SUTH A SUTH A SUTH A SUTH A SUTH A SUTH A
    42005M001 GALA A        GALA B GALA A        GALA B GALA A GALA A GALA A
    13407S012 MADR A               MADR A MAD2 A MADR A MAD2 A MADR A MADR A
    12353M001 YAKZ A                             YAKZ A YAKZ A YAKA A YAKA A
    40114M001 NRC1 A NRC1 A NRC1 A        NRC1 A        NRC1 A NRC1 A NRC1 A
                     NRC2 A                                                 
    40405S031 GOLD A        GOL2 A GOLD A        GOL2 A GOL2 A GOLD A GOLD A
    50103M108 TIDB A        TID2 A TIDB A TIDB A TID2 A TID2 A TIDB A TIDB A
    51002M001 LAE1 A               LAE1 A LAE1 A                            
    51002S001                                           LAE1 A              
    42202M005 AREQ A AREQ A AREQ A AREQ A AREQ A AREQ B AREQ A AREQ A AREQ A
    22003M001               PIMO B        PIMO A        PIMO A PIMO A PIMO A

IERS DOMES NO    mit    ncl    IGS    igs
============= ====== ====== ====== ======
    13407S012 MADR A MADR A MADR A MADR A
              MAD2 A                     
    31303M001 MAS1 A                     
    31303M002        MAS1 A MAS1 A MAS1 A
    40114M001 NRC1 A NRC1 A NRC1 A NRC1 A
              NRC2 A                     
    40405S031 GOLD A GOL2 A GOLD A GOLD A
              GOL2 A                     
    50103M108 TIDB A TID2 A TIDB A TIDB A
              TID2 A TIDB A              
    51002S001 LAE1 A                     
    51002M001        LAE1 A              
    12353M001 YAKZ A YAKZ A YAKA A YAKA A
    12309M001 MDVO A                     
    12309M002               MDVO A MDVO A

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

 _______________________ 
|Enforcing these aliases|
|_______________________|
   YAKA A: YAKZ A  
   GOLD A: GOL2 A  
   TIDB A: TID2 A  
   SUTH A: SUTH B  
   GALA A: GALA B  
   PIMO A: PIMO B  
   MADR A: MAD2 A  
   AREQ A: AREQ B  

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 cod11157.snx (cod).           
------- --------- -- ---- 
    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.)
=== ==== ==   ====   ====   ====   ====   ====   ====   ====   ====   ====
cod LAE1  A  .1100  .0000  .0000  .1280  .0000  .0000  .0150  .0000  .0000
IGS LAE1  A  .1100  .0000  .0000  .1280  .0000  .0000  .0110  .0000  .0000

cod MDVO  A  .0780  .0000 -.0030  .0744 -.0031 -.0013  .1456  .0000  .0000
IGS MDVO  A  .0960 -.0016  .0009  .0944  .0016  .0041  .1456  .0000  .0000

Antenna Conflicts in file gfz11157.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 LAE1  A  .1100  .0000  .0000  .1280  .0000  .0000  .0150  .0000  .0000
IGS LAE1  A  .1100  .0000  .0000  .1280  .0000  .0000  .0110  .0000  .0000

Antenna Conflicts in file ngs11157.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 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 sio11157.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 LAE1  A  .1100  .0000  .0000  .1280  .0000  .0000  .0150  .0000  .0000
IGS LAE1  A  .1100  .0000  .0000  .1280  .0000  .0000  .0110  .0000  .0000

The following files have no antenna conflicts: 
   - emr11157.snx (emr)            
   - esa11157.snx (esa)            
   - jpl11157.snx (jpl)            
   - mit1115g.snx (mit)            
   - ncl1115g.snx (ncl)            
--