Subject: [IGSREPORT-17326] Wk 1526 IGS SINEX Combination
From: "IGS SINEX" <[email-masked]>
To: [email-masked]
Cc: [email-masked]
Date: Wed, 22 Apr 2009 18:39:35 -0400

******************************************************************************
IGS Electronic Report   22 Apr 15:39:37 PDT 2009      Message Number 17326
******************************************************************************

Author:  R. Ferland, M. Piraszewski

===============================================================
 Combined AC solution for GPS week 1526 - 09/04/05 to 09/04/11
===============================================================

1) Contacts:
============
e-mail: [email-masked]
Tel:    (613)995-4002 (Remi Ferland)
Fax:    (613)995-3215

2) Products:
============
All products are available at:
  CDDIS (cddis.gsfc.nasa.gov) and SOPAC (garner.ucsd.edu)

igs09P1526.snx  Combined weekly solution. 
igs09P1526.erp  Daily Earth Rotation Parameters.
igs00p03.erp    Daily Earth Rotation Parameters since GPS week 860. 
IGS09P14.snx    Cumulative Combined solution. 
igs09P1526.sum  This file.
igs09P1526.itr  Residuals between the AC and the IGS05 for the RF stations. 
igs09P1526.res  Residuals between the AC and the Combined Weekly solution.
IGS09P14.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
     IGS05 stations at the current epoch.
     ftp://igscb.jpl.nasa.gov/igscb/station/coord/IGS05.snx
3-4) The AC are compared to IGS05, 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 IGS05 of the current
     epoch using a 7-parameters transformation. The singular cumulative
     combined solution is aligned to the IGS05 of the reference epoch
     using a 14-parameters transformation and the 132 ITRF station positions
     and velocities. The IGS05 is a realization of ITRF2005.

     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 = IGS05.snx
     igs = igs09P1526.snx
     IGS = IGS09P14.snx

     MIT = mit15267.snx
     mit = mit1526g.snx

     BuA = IERS Bulletin A

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

     Solutions with manual station deletion:
         From the original solution:
             cod  SATA  X  Y  Z
             emr  SATA  X  Y  Z
             gfz  SATA  X  Y  Z
             MIT  SATA  X  Y  Z
             sio  SATA  X  Y  Z
             mit  SATA  X  Y  Z
         After unconstraining:
             gfz  EIL1  RESO
             grg  FAIR  NOVM
             mit  KUUJ  RESO

     4-1) Starting with GPS week 1400, the solutions are aligned to the
          IGS05.snx realization of ITRF2005.

     4-2) Starting with GPS week 1078, UT1-UTC from IERS Bulletin A
          is included in the erp files.

     4-3) Starting with GPS week 1412, the accumulated ERP file has been
          changed from "igs00p02.erp" to "igs00p03.erp". The main changes
          are:
       1) Correction of the pole position from IGb00 to IGS05 using the
          transformation in:
             http://igscb.jpl.nasa.gov/mail/igsmail/2006/msg00178.html
       2) Marginal ERP's in GPS week 1161 were replaced by reprocessed
          values.

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            | 217 |  76 |        20.763 |         1.000 |        20.767 |
emr            |  71 |  48 |         5.428 |         1.000 |         5.429 |
esa            | 119 |  49 |         4.737 |         1.000 |         4.737 |
gfz            | 191 |  76 |        14.449 |         1.000 |        14.451 |
jpl            | 112 |  58 |         9.175 |         0.996 |         9.141 |
MIT            | 248 |  84 |         1.887 |         1.000 |         1.887 |
ngs            | 221 |  87 |        32.518 |         1.000 |        32.523 |
sio            | 247 |  82 |         2.193 |         1.000 |         2.193 |
grg            | 109 |  54 |        17.027 |         1.000 |        17.027 |
mit            | 397 |  81 |         1.873 |         0.973 |         1.823 |
ncl            | 211 |  86 |         2.647 |         1.124 |         2.974 |
igs            | 342 |  88 |         1.428 |         0.999 |         1.426 |
---------------|-----|-----|---------------|---------------|---------------|

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

5-2-1)    With respect to the IGS05 stations:
=============================================

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod         76 |    -1.3      0.0      0.2 |     3.3      3.0      9.4 |
emr         48 |    -1.8      0.2      0.3 |     4.3      2.8     11.7 |
esa         49 |    -1.3     -0.1      0.6 |     3.3      2.8     10.5 |
gfz         76 |    -0.7     -0.1      0.2 |     3.2      3.1      9.5 |
jpl         58 |    -1.6      0.2     -0.1 |     3.9      2.8     11.9 |
MIT         84 |    -0.2      0.1      0.0 |     2.9      2.8      9.6 |
ngs         87 |    -0.4      0.0      0.0 |     3.5      2.8      9.3 |
sio         82 |     0.5      0.0      0.1 |     3.3      3.1      8.9 |
grg         54 |    -0.4     -0.1      0.0 |     2.5      1.1      6.6 |
mit         80 |    -0.2      0.0      0.1 |     2.8      2.8      8.5 |
ncl         86 |    -0.5      0.1      0.1 |     3.0      2.9      9.4 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        201 |    -0.7     -0.1      0.2 |     1.0      1.2      2.9 |
emr         64 |    -1.2      0.1     -0.9 |     2.4      1.6      6.4 |
esa        110 |    -1.5     -0.2      0.6 |     2.0      1.3      4.2 |
gfz        182 |    -0.3     -0.2     -0.2 |     1.3      1.1      2.5 |
jpl        105 |    -0.8      0.1     -0.2 |     1.5      2.7      4.4 |
MIT        214 |     0.1      0.2      0.3 |     0.9      0.7      2.2 |
ngs        204 |     0.2      0.0      0.0 |     1.1      1.2      3.0 |
sio        233 |     1.4      0.3      0.3 |     1.0      1.3      3.0 |
grg        103 |     0.1      0.2      0.8 |     2.5      5.0      8.0 |
mit        330 |     0.2     -0.1      0.2 |     0.5      0.6      1.3 |
ncl        198 |    -0.2     -0.1     -0.5 |     0.7      0.7      1.3 |
ITR         87 |     0.5      0.0      0.1 |     3.2      3.0      9.0 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        174 |    -1.6     -0.1      0.5 |     1.7      1.6      5.1 |
emr         67 |    -2.0      0.0     -0.4 |     2.9      1.8      8.8 |
esa         95 |    -2.5     -0.2      0.3 |     2.5      1.7      6.1 |
gfz        169 |    -1.1     -0.2      0.3 |     2.1      1.8      5.2 |
jpl        103 |    -1.4      0.0      0.8 |     2.4      3.3      6.3 |
MIT        188 |    -0.8      0.0      0.4 |     1.6      1.7      4.7 |
ngs        175 |    -0.7     -0.1      0.3 |     2.0      2.1      5.0 |
sio        200 |     0.5      0.1      0.6 |     1.8      2.2      5.3 |
grg        102 |    -0.5     -0.6      1.4 |     2.7      4.8      7.0 |
mit        241 |    -0.7     -0.1      0.4 |     1.6      1.9      4.5 |
ncl        191 |    -1.1     -0.3     -0.3 |     1.6      2.0      4.7 |
igs        244 |    -0.8      0.0      0.2 |     1.4      1.5      4.1 |
ITR        127 |    -0.3     -0.1      0.0 |     2.6      2.5      9.2 |
---------------|---------------------------|---------------------------|

5-3)      7-Parameters Transformation: AC ----> IGS05.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   -0.022    0.006      0.2      0.6     -0.3     0.08 |
emr            |   0.070    0.027    0.083     10.6    -10.8     -2.1     0.28 |
esa            |  -0.042   -0.057    0.035      4.5     -3.8     -5.0    -0.00 |
gfz            |   0.022   -0.004    0.027      0.4      0.8      1.4    -0.31 |
jpl            |  -0.009   -0.044    0.011      5.9      3.9      7.8     0.29 |
MIT            |  -0.029    0.021   -0.010      7.2     -6.2     -0.7    -0.03 |
ngs            |  -0.081   -0.204    0.021     13.1     -6.2     -0.4     0.13 |
sio            |   0.064   -0.066    0.004      7.0      3.4     13.0     0.24 |
grg            |   0.006   -0.017    0.025      3.7     -0.9     -2.5    -0.00 |
mit            |  -0.017    0.009    0.001     -0.1      0.0      0.9    -0.01 |
ncl            |   0.030    0.059    0.019     -1.4      0.6      0.6     0.05 |
igs            |   0.000    0.000    0.000      0.0      0.0      0.0     0.08 |
---------------|---------------------------------------------------------------|

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            |   0.046    0.048    0.050      1.2      1.2      1.2     0.19 |
emr            |   0.055    0.061    0.063      1.5      1.5      1.5     0.23 |
esa            |   0.054    0.060    0.064      1.5      1.5      1.5     0.23 |
gfz            |   0.045    0.047    0.051      1.2      1.2      1.2     0.19 |
jpl            |   0.050    0.053    0.058      1.3      1.3      1.3     0.21 |
MIT            |   0.044    0.046    0.049      1.2      1.2      1.2     0.18 |
ngs            |   0.043    0.045    0.048      1.2      1.1      1.1     0.18 |
sio            |   0.044    0.047    0.048      1.2      1.2      1.2     0.18 |
grg            |   0.053    0.055    0.064      1.4      1.4      1.4     0.22 |
mit            |   0.044    0.047    0.049      1.2      1.2      1.2     0.18 |
ncl            |   0.043    0.046    0.048      1.2      1.2      1.1     0.18 |
igs            |   0.000    0.000    0.000      0.0      0.0      0.0     0.20 |
---------------|---------------------------------------------------------------|

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

               |      X        Y        Z  |    s X      s Y      s Z  |
               |    (mm)     (mm)     (mm) |    (mm)     (mm)     (mm) |
---------------|---------------------------|---------------------------|
igs            |     9.3     -5.4     -2.9 |     1.0      0.8      2.2 |
---------------|---------------------------|---------------------------|

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            |     ---        ---       ---       ---       ---       --- |
emr            |     ---       -8.5       1.2      10.3      -2.9      30.0 |
esa            |     ---        8.0      -5.0       9.0      -6.3     -15.2 |
gfz            |     ---       -0.1      -1.1      -3.8      -3.4      -1.9 |
jpl            |     ---        0.1     -17.4       0.8       9.7      11.4 |
MIT            |     ---       -2.3       0.9      -3.8      -1.1       3.5 |
ngs            |     ---        0.0       3.0      -6.2       5.5       1.6 |
sio            |     ---        4.9       3.1      12.1      -3.5     -15.2 |
grg            |     ---      -14.2       0.6       8.1      -3.7       2.2 |
mit            |     ---       26.5       0.2      12.3      -3.4     -11.3 |
ncl            |     ---        ---       ---       ---       ---       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---        1.1       3.1       8.3       0.2       3.3 |
---------------|------------------------------------------------------------|

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

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---        ---       ---       ---       ---       --- |
emr            |     ---        5.7       3.4       8.7       2.1      16.4 |
esa            |     ---       17.6       2.5      13.2       0.9      11.9 |
gfz            |     ---        4.9       1.7       9.1       2.0       5.8 |
jpl            |     ---        7.9       5.9      20.6       4.7      15.3 |
MIT            |     ---        2.4       1.0       5.3       0.9       2.9 |
ngs            |     ---        8.2       4.0       8.7       4.4      14.1 |
sio            |     ---        2.7       1.9      11.5       0.7       7.4 |
grg            |     ---       40.2       5.4      13.2       4.1      15.6 |
mit            |     ---        3.1       1.8      10.9       0.8       6.8 |
ncl            |     ---        ---       ---       ---       ---       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       12.5       6.7      15.3       8.0      12.7 |
---------------|------------------------------------------------------------|

5-6)      Satellite Antenna Offset Residuals weighted Average & STD:
====================================================================
          No Satellite phase center ... 

5-7)      Outliers:
===================

Thresholds set at 5 sigmas and 50 mm.

 Solution             Solution           |  Station   |    N       E       U  |
              Minus                      |code id soln|   (mm)    (mm)    (mm)|
-----------------------------------------|------------|-----------------------|
                                         |            |                       |
ITRF_IGS05.snx       cod15267.snx        |SUTH  A    1|    1.3    -7.7    89.9|
                                         |            |                       |
ITRF_IGS05.snx       cod15267.snx        |CAS1  A    3|    0.1     2.3   -25.7|
ITRF_IGS05.snx       cod15267.snx        |PIMO  A    3|  -12.7     1.5    -5.0|
                                         |            |                       |
ITRF_IGS05.snx       esa15267.snx        |GUAM  A    4|  -13.3    -2.5     4.7|
ITRF_IGS05.snx       esa15267.snx        |OHI3  A    1|   -0.8     8.1   -48.5|
ITRF_IGS05.snx       esa15267.snx        |PIMO  A    3|  -13.2    -1.1   -14.6|
                                         |            |                       |
ITRF_IGS05.snx       gfz15267.snx        |GUAM  A    4|  -11.9    -3.7     1.8|
ITRF_IGS05.snx       gfz15267.snx        |PIMO  A    3|  -11.1     0.4   -21.8|
                                         |            |                       |
ITRF_IGS05.snx       MIT15267.snx        |OHI3  A    1|   52.6    46.0    -1.5|
                                         |            |                       |
ITRF_IGS05.snx       MIT15267.snx        |GUAM  A    4|  -10.4    -6.8     3.8|
ITRF_IGS05.snx       MIT15267.snx        |NYAL  A    3|    3.4     0.8    24.1|
ITRF_IGS05.snx       MIT15267.snx        |PIE1  A    1|   -8.8     5.1    15.3|
ITRF_IGS05.snx       MIT15267.snx        |PIMO  A    3|  -11.2    -0.5   -14.9|
ITRF_IGS05.snx       MIT15267.snx        |UNSA  A    1|   -3.5    10.9     4.7|
                                         |            |                       |
ITRF_IGS05.snx       ngs15267.snx        |QUIN  A    3|    3.1    -0.8    23.0|
                                         |            |                       |
ITRF_IGS05.snx       sio15267.snx        |NYAL  A    3|    3.7    -0.5    30.8|
ITRF_IGS05.snx       sio15267.snx        |OHI3  A    1|   29.4    25.2    -6.7|
ITRF_IGS05.snx       sio15267.snx        |QUIN  A    3|    5.2     1.5    21.7|
                                         |            |                       |
ITRF_IGS05.snx       mit1526g.snx        |OHI3  A    1|   26.7    21.1   -17.0|
ITRF_IGS05.snx       mit1526g.snx        |SUTH  A    1|   -0.5    -6.0    89.7|
                                         |            |                       |
ITRF_IGS05.snx       mit1526g.snx        |CAS1  A    3|    2.4     1.5   -23.5|
ITRF_IGS05.snx       mit1526g.snx        |GUAM  A    4|  -11.2    -4.8     3.3|
ITRF_IGS05.snx       mit1526g.snx        |NYAL  A    3|    4.0     0.1    26.7|
ITRF_IGS05.snx       mit1526g.snx        |PIE1  A    1|   -8.1     4.9    13.7|
ITRF_IGS05.snx       mit1526g.snx        |PIMO  A    3|  -10.8     0.3   -14.6|
                                         |            |                       |
ITRF_IGS05.snx       mit1526g.snx        |QUIN  A    3|    3.4    -0.3    23.4|
                                         |            |                       |
ITRF_IGS05.snx       ncl1526g.snx        |OHI3  A    1|   50.8    44.7    -1.0|
                                         |            |                       |
ITRF_IGS05.snx       ncl1526g.snx        |CAS1  A    3|    1.7     0.9   -25.4|
ITRF_IGS05.snx       ncl1526g.snx        |GUAM  A    4|  -12.2    -5.5     5.6|
ITRF_IGS05.snx       ncl1526g.snx        |PIMO  A    3|  -12.2    -0.6   -14.3|
                                         |            |                       |
igs09P1525.snx       ncl1526g.snx        |RESO  A    1|    1.2    11.6     4.4|
                                         |            |                       |
IGS09P13.snx         cod15267.snx        |MOBJ  A    1|   -8.5     2.6   135.9|
                                         |            |                       |
IGS09P13.snx         cod15267.snx        |EIL1  A    1|   -0.1   -12.2   -17.0|
IGS09P13.snx         cod15267.snx        |RESO  A    1|   -0.3    12.5    -2.0|
                                         |            |                       |
IGS09P13.snx         jpl15267.snx        |GUAT  A    1|   -4.1   -16.7     6.2|
IGS09P13.snx         jpl15267.snx        |XIAN  A    1|  -15.5    34.8   -38.4|
                                         |            |                       |
IGS09P13.snx         MIT15267.snx        |NETT  A    1|   17.0   -74.6   -11.1|
                                         |            |                       |
IGS09P13.snx         MIT15267.snx        |EIL1  A    1|    1.6   -13.0   -21.4|
                                         |            |                       |
IGS09P13.snx         ngs15267.snx        |EIL1  A    1|    0.6   -16.0   -22.7|
                                         |            |                       |
IGS09P13.snx         sio15267.snx        |RESO  A    1|    0.9    12.8     9.3|
                                         |            |                       |
IGS09P13.snx         mit1526g.snx        |NETT  A    1|   18.8   -73.5   -12.8|
                                         |            |                       |
IGS09P13.snx         mit1526g.snx        |EIL1  A    1|    1.3   -13.2   -18.9|
IGS09P13.snx         mit1526g.snx        |MOBJ  A    1|   -8.0     2.8   137.6|
                                         |            |                       |
IGS09P13.snx         mit1526g.snx        |WUHN  A    4|  -10.9    -1.3    -9.8|
                                         |            |                       |
IGS09P13.snx         igs09P1526.snx      |ALRT  A    1|   -0.4     4.7     2.8|
IGS09P13.snx         igs09P1526.snx      |GUAT  A    1|   -2.3    -4.7    -1.0|
IGS09P13.snx         igs09P1526.snx      |OHI2  A    1|   -7.0     3.3     1.6|
IGS09P13.snx         igs09P1526.snx      |PERT  A    4|    1.7    -6.3    -2.3|
IGS09P13.snx         igs09P1526.snx      |QIKI  A    1|    3.0    -6.6     9.1|
IGS09P13.snx         igs09P1526.snx      |REYK  A    4|    1.9    -2.4    13.7|
IGS09P13.snx         igs09P1526.snx      |SCH2  A    2|   -4.3    -4.1     2.6|
IGS09P13.snx         igs09P1526.snx      |TWTF  A    2|   -5.8     0.5    -3.1|
-----------------------------------------|------------|-----------------------|