Subject: [IGSREPORT-8898] Wk 1144 IGS SINEX Combination
From: David Hutchison <[email-masked]>
To: [email-masked]
Date: Thu, 27 Dec 2001 20:42:48 -0500 (EST)

******************************************************************************
IGS Electronic Report   27 Dec 17:42:51 PST 2001      Message Number 8898
******************************************************************************

Author:  R. Ferland, D. Hutchison
===================================================================
 Combined AC  solution for GPS week 1144 -  01/12/09 to 01/12/15
===================================================================
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
igs01P1144.snx  Combined weekly solution. 
igs01P1144.erp  Daily Earth Rotation Parameters.
igs00p02.erp    Daily Earth Rotation Parameters since GPS week 1013.
IGS01P50.snx    Cumulative Combined solution. 
igs01P1144.sum  This file.
igs01P1144.itr  Residuals between the AC and the IGS00 for the RF stations. 
igs01P1144.res  Residuals between the AC and the Combined Weekly solution.
IGS01P50.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 = igs01P1144.snx
     IGS = IGS01P50.snx
     BuA = IERS Bulletin A
     gfz excluded from the geocenter estimation (Sec. 5-4).
     Solutions with manual station deletion:
         From the original solution:
             ITR  AREQ
         After unconstraining:
             emr  NRC1  NRC2
     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            | 122 |  45 |        25.919 |         0.996 |        25.806 |
emr            |  41 |  30 |         3.845 |         0.997 |         3.835 |
esa            |  57 |  32 |        10.645 |         0.996 |        10.601 |
gfz            |  81 |  38 |         7.770 |         1.067 |         8.292 |
jpl            |  64 |  27 |         4.608 |         0.996 |         4.590 |
sio            | 131 |  47 |         2.067 |         1.096 |         2.265 |
igs            | 146 |  50 |         1.216 |         1.110 |         1.350 |
---------------|-----|-----|---------------|---------------|---------------|
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         44 |    -0.7      0.1     -1.2 |     3.1      3.6     12.2 |
emr         29 |    -3.9     -0.5      0.9 |     4.1      4.7      8.7 |
esa         30 |    -8.4     -0.4      3.1 |     6.7      4.9     14.2 |
gfz         36 |    -2.0      0.0      0.2 |     2.5      3.8      8.2 |
jpl         26 |    -2.8     -0.2      1.0 |     2.5      2.8      9.1 |
sio         46 |    -1.1     -0.1      0.8 |     2.6      3.3     10.1 |
---------------|---------------------------|---------------------------|
5-2-2)    With respect to the Weekly Combination:
=================================================
Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        119 |     0.5      1.2     -2.1 |     2.2      3.3     10.0 |
emr         40 |    -2.2     -0.7      1.7 |     2.6      3.4      7.1 |
esa         56 |    -7.3      0.2      3.8 |     5.2      4.9      9.8 |
gfz         74 |    -0.6      0.7      0.6 |     1.8      1.7      5.9 |
jpl         57 |    -1.0     -0.1      1.7 |     1.6      1.3      6.7 |
sio        123 |     0.4     -0.2      1.3 |     1.6      2.9      6.9 |
ITR         49 |     1.3      0.0     -0.2 |     2.4      2.9      7.1 |
---------------|---------------------------|---------------------------|
5-2-3)    With respect to the Cumulative Combination:
=====================================================
Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        120 |    -1.0      0.5     -2.4 |     3.0      3.6     11.1 |
emr         41 |    -4.1     -0.8      2.1 |     3.8      4.8      9.3 |
esa         57 |    -8.8     -0.7      3.3 |     6.0      5.3     14.3 |
gfz         76 |    -2.4      0.0      0.4 |     3.5      3.5     10.0 |
jpl         59 |    -3.1     -0.2      2.3 |     3.3      3.0      9.5 |
sio        125 |    -1.5     -0.5      1.7 |     2.9      3.6     11.0 |
igs        146 |    -1.7     -0.5     -0.1 |     2.2      2.3      7.6 |
ITR         54 |    -0.1     -0.1      0.0 |     0.4      0.4      0.9 |
---------------|---------------------------|---------------------------|
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            |   0.023   -0.014    0.013     15.0     11.4      2.8     1.68 |
emr            |   0.015   -0.005    0.026     -2.5     -5.9      4.8     0.63 |
esa            |   0.053    0.005   -0.014     -7.7     42.2     14.6     0.31 |
gfz            |  -0.017   -0.014    0.047     -0.5      0.3     -1.7     1.52 |
jpl            |   0.000   -0.010    0.026     -2.9     17.5     -5.9     0.44 |
sio            |   0.193   -0.125   -0.002     10.7     14.2     87.5     1.48 |
---------------|---------------------------------------------------------------|
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            |   0.059    0.060    0.067      1.5      1.5      1.5     0.24 |
emr            |   0.075    0.071    0.084      1.9      1.9      1.9     0.30 |
esa            |   0.073    0.079    0.085      2.0      2.0      2.0     0.31 |
gfz            |   0.066    0.065    0.076      1.7      1.7      1.7     0.27 |
jpl            |   0.078    0.074    0.090      2.0      2.0      2.0     0.31 |
sio            |   0.058    0.058    0.065      1.5      1.5      1.5     0.23 |
---------------|---------------------------------------------------------------|
5-4)      Geocenter:
====================
               |      X        Y        Z  |    s X      s Y      s Z  |
               |    (mm)     (mm)     (mm) |    (mm)     (mm)     (mm) |
---------------|---------------------------|---------------------------|
igs            |     3.8     13.8     11.3 |     4.2      4.3      6.6 |
---------------|---------------------------|---------------------------|
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            |     ---        1.4      -1.7       ---      -2.7       --- |
emr            |     ---        3.9      -6.1       1.0       4.7     -20.3 |
esa            |     ---       -8.6     -22.1      -5.9      -2.2        .8 |
gfz            |     ---      -13.2       2.8       1.4       -.1        .2 |
jpl            |     ---       21.0       4.5       1.3       4.5       7.0 |
sio            |     ---       10.4      11.7       3.1       1.4       4.3 |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---        3.2       2.2       -.4      28.5       5.0 |
---------------|------------------------------------------------------------|
5-5-2)    STD :
===============
Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---        8.0       3.9       ---       4.3       --- |
emr            |     ---       11.4       5.2      19.1       2.9      25.6 |
esa            |     ---       13.5      11.4      33.4       3.6      11.4 |
gfz            |     ---        8.6       1.8       8.9       2.7       6.3 |
jpl            |     ---       20.7       3.2      14.0       2.5      16.1 |
sio            |     ---        7.1       5.9      10.3       7.3       5.4 |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       23.6       6.7      11.1       9.2       8.7 |
---------------|------------------------------------------------------------|
5-6)      Outliers:
===================
Thresholds set at 5 sigmas and 50 mm.
 Solution             Solution           |  Station   |    N       E       U  |
              Minus                      |code id soln|   (mm)    (mm)    (mm)|
-----------------------------------------|------------|-----------------------|
                                         |            |                       |
esa11447.snx         gfz11447.snx        |SANT  A ----|   -5.1    -4.5   -51.3|
                                         |            |                       |
igs01P1143.snx       esa11447.snx        |KELY  A ----|   -3.3     3.8    85.4|
                                         |            |                       |
IGS01P49.snx         cod11447.snx        |HOFN  A ----|    5.8    -4.5   -64.4|
IGS01P49.snx         cod11447.snx        |SCH2  A ----|   -6.3     7.1    54.8|
                                         |            |                       |
IGS01P49.snx         emr11447.snx        |GOUG  A ----|    4.6     2.0    51.4|
                                         |            |                       |
IGS01P49.snx         sio11447.snx        |HERS  A ----|   -2.2    13.3    18.5|
IGS01P49.snx         sio11447.snx        |HOFN  A ----|    6.6    -3.4   -53.5|
IGS01P49.snx         sio11447.snx        |WHIT  A ----|    5.0    -2.2   -34.4|
                                         |            |                       |
IGS01P49.snx         igs01P1144.snx      |COCO  A ----|    0.8   -16.0     1.5|
IGS01P49.snx         igs01P1144.snx      |KSTU  A ----|  -18.7    -2.1    24.2|
-----------------------------------------|------------|-----------------------|
5-7)              Conflicts:
=========================== 
5-7-1) Station Name Conflicts:
============================= 
IERS DOMES NO    cod    emr    esa    gfz    jpl    sio    IGS    igs
============= ====== ====== ====== ====== ====== ====== ====== ======
    42005M001 GALA A GALA A GALA B GALA A GALA A GALA A GALA A GALA A
    22306M002 IISC A IISC A IISC B IISC A IISC A IISC A IISC A IISC A
    13407S012 MADR A               MADR A MAD2 A MAD2 A MADR A MADR A
                                                 MADR A              
    40114M001 NRC1 A NRC1 A NRC1 A        NRC1 A NRC1 A NRC1 A NRC1 A
                     NRC2 A                                          
    40405S031 GOLD A               GOLD A        GOLD A GOLD A GOLD A
                                                 GOL2 A              
    30314M002 SUTH A SUTH A SUTH B        SUTH A SUTH A SUTH A SUTH A
 
MISSING IERS DOMES NOS AT gfz:
-----------------------------
  BISH A
 
MISSING IERS DOMES NOS AT sio:
-----------------------------
  CAVA A  SFEL A  VOLT A
 
MISSING IERS DOMES NOS AT IGS:
-----------------------------
  ELAT A
5-7-2) Station Antenna Conflicts:
================================ 
 _______________________ 
|Enforcing these aliases|
|_______________________|
   NRC1 A: NRC2 A  
   GALA A: GALA B  
   SUTH A: SUTH B  
   IISC A: IISC B  
   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) 
Comments: Recent antenna changes at CAGL, CHAT and NOUM not registered at
--------  COD and SIO.
Compare to file IGS.SNX (IGS).                
Antenna Conflicts in file cod11447.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 CAGL  A  .1100  .0000  .0000  .1280  .0000  .0000  .0450  .0000  .0000
IGS CAGL  A  .1100  .0000  .0000  .1280  .0000  .0000  .0000  .0000  .0000
Antenna Conflicts in file sio11447.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 CAGL  A  .1100  .0000  .0000  .1280  .0000  .0000  .0450  .0000  .0000
IGS CAGL  A  .1100  .0000  .0000  .1280  .0000  .0000  .0000  .0000  .0000
sio CHAT  A  .1100  .0000  .0000  .1280  .0000  .0000  .0031  .0000  .0000
IGS CHAT  A  .1100  .0000  .0000  .1280  .0000  .0000  .0062  .0000  .0000
sio NOUM  A  .1100  .0000  .0000  .1280  .0000  .0000  .0000  .0000  .0000
IGS NOUM  A  .0714  .0003  .0005  .0682 -.0004  .0001  .0000  .0000  .0000
The following files have no antenna conflicts: 
   - emr11447.snx (emr)            
   - esa11447.snx (esa)            
   - gfz11447.snx (gfz)            
   - jpl11447.snx (jpl)            
-- 
David Hutchison
Geodetic Survey of Canada
Ottawa, Ontario, Canada
Internet: [email-masked]