Subject: [IGSREPORT-16013] Wk 1467 IGS SINEX Combination
From: "IGS SINEX" <[email-masked]>
To: [email-masked]
Cc: [email-masked]
Date: Wed, 5 Mar 2008 22:03:02 -0500

******************************************************************************
IGS Electronic Report   05 Mar 19:03:04 PST 2008      Message Number 16013
******************************************************************************

Author:  R. Ferland, M. Piraszewski

===============================================================
 Combined AC solution for GPS week 1467 - 08/02/17 to 08/02/23
===============================================================

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)

igs08P1467.snx  Combined weekly solution. 
igs08P1467.erp  Daily Earth Rotation Parameters.
igs00p03.erp    Daily Earth Rotation Parameters since GPS week 860. 
IGS08P08.snx    Cumulative Combined solution. 
igs08P1467.sum  This file.
igs08P1467.itr  Residuals between the AC and the IGS05 for the RF stations. 
igs08P1467.res  Residuals between the AC and the Combined Weekly solution.
IGS08P08.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 = igs08P1467.snx
     IGS = IGS08P08.snx

     MIT = mit14677.snx
     mit = mit1467g.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).

     Solutions with manual station deletion:
         After unconstraining:
             sio  GLSV

     New stations in the cumulative solution IGS08P08.snx
                  NTUS A    5 

     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            | 174 |  91 |        23.544 |         1.000 |        23.548 |
emr            |  66 |  44 |         4.755 |         1.000 |         4.755 |
esa            | 111 |  78 |         5.757 |         1.000 |         5.758 |
gfz            | 171 |  90 |        14.255 |         1.000 |        14.258 |
jpl            | 124 |  63 |         5.624 |         1.000 |         5.625 |
MIT            | 250 |  99 |         2.598 |         1.000 |         2.599 |
ngs            | 210 | 100 |        40.550 |         1.000 |        40.555 |
sio            | 158 |  86 |         2.669 |         1.000 |         2.669 |
mit            | 346 |  99 |         1.614 |         0.983 |         1.587 |
ncl            | 180 |  99 |         4.144 |         1.000 |         4.144 |
igs            | 309 | 102 |         1.375 |         1.000 |         1.375 |
---------------|-----|-----|---------------|---------------|---------------|

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         91 |    -0.3     -0.2     -0.1 |     3.1      2.6      9.2 |
emr         44 |    -1.3      0.0      0.1 |     4.0      2.8      8.8 |
esa         78 |     0.1     -0.1      0.0 |     3.8      3.0     11.8 |
gfz         90 |    -0.2     -0.1      0.3 |     2.9      2.5      7.8 |
jpl         63 |    -0.2     -0.1      0.3 |     3.2      2.8      9.9 |
MIT         99 |     0.1      0.0      0.4 |     2.9      2.8      7.9 |
ngs        100 |    -0.6      0.0      0.2 |     3.1      2.5      8.6 |
sio         86 |     0.8      0.0      0.3 |     2.9      2.7      7.9 |
mit         98 |    -0.4     -0.1      0.4 |     2.7      2.4      7.5 |
ncl         99 |     0.0      0.0      0.1 |     1.3      1.2      3.1 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        169 |    -0.3      0.0     -0.5 |     1.2      0.9      3.1 |
emr         65 |    -1.0     -0.1      0.6 |     2.0      1.6      5.3 |
esa        108 |     0.6      0.0      0.4 |     3.0      1.5      7.1 |
gfz        169 |     0.1      0.0     -0.1 |     0.8      1.0      2.4 |
jpl        121 |     0.4      0.2      0.6 |     1.1      2.2      5.4 |
MIT        218 |     0.3      0.1     -0.2 |     0.6      0.9      2.0 |
ngs        195 |    -0.6      0.3      0.5 |     1.8      2.1      3.4 |
sio        152 |     0.9     -0.1      0.2 |     1.0      1.7      3.4 |
mit        304 |    -0.2      0.0      0.0 |     0.3      0.3      1.1 |
ncl        174 |     0.1      0.2     -0.1 |     1.9      1.7      4.7 |
ITR        101 |     0.2      0.0     -0.2 |     2.6      2.2      7.6 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        159 |    -0.4     -0.1     -0.2 |     1.9      1.8      5.8 |
emr         62 |    -1.3      0.1      0.3 |     2.8      2.5      6.8 |
esa        100 |     0.2      0.0     -0.2 |     3.0      2.4      9.7 |
gfz        162 |    -0.2     -0.3      0.1 |     1.8      1.9      4.9 |
jpl        112 |     0.2      0.3      0.7 |     2.0      2.8      7.3 |
MIT        186 |     0.0     -0.1      0.4 |     1.8      2.0      5.2 |
ngs        164 |    -0.7      0.2      0.2 |     2.1      2.7      6.7 |
sio        150 |     0.8     -0.3      0.2 |     1.8      2.5      5.3 |
mit        240 |    -0.5     -0.1      0.6 |     1.4      1.7      4.5 |
ncl        166 |    -0.1      0.1      0.1 |     2.0      2.0      4.4 |
igs        242 |    -0.2      0.0      0.6 |     1.4      1.6      4.4 |
ITR        126 |    -0.3      0.0     -0.1 |     2.0      1.8      7.2 |
---------------|---------------------------|---------------------------|

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            |  -0.002   -0.004   -0.009      0.4      0.7      0.2    -0.05 |
emr            |   0.032    0.008    0.034     -3.4      1.6     -8.4     0.21 |
esa            |   0.027    0.015    0.006      0.0      6.7     -3.6    -0.29 |
gfz            |  -0.005   -0.004    0.001      0.6     -0.1      0.7    -0.20 |
jpl            |   0.000    0.021   -0.019     -5.5     -2.2     -3.1     0.28 |
MIT            |   0.008   -0.003    0.001      6.3     -6.7     -3.8     0.09 |
ngs            |  -0.142   -0.082    0.045      5.4     -9.2     -0.1    -0.70 |
sio            |   0.038    0.037   -0.017     -3.6      3.5      4.4     0.66 |
mit            |  -0.002   -0.001   -0.001      0.0      0.2      0.3     0.01 |
ncl            |   0.006   -0.002   -0.011      2.6     -0.8      0.4    -0.08 |
igs            |   0.000    0.000    0.000      0.0      0.0      0.0     0.01 |
---------------|---------------------------------------------------------------|

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            |   0.042    0.044    0.046      1.1      1.1      1.1     0.17 |
emr            |   0.058    0.059    0.066      1.5      1.5      1.5     0.24 |
esa            |   0.044    0.048    0.049      1.2      1.2      1.2     0.18 |
gfz            |   0.043    0.043    0.047      1.1      1.1      1.1     0.17 |
jpl            |   0.052    0.054    0.055      1.4      1.4      1.3     0.21 |
MIT            |   0.041    0.042    0.044      1.1      1.1      1.1     0.17 |
ngs            |   0.041    0.042    0.045      1.1      1.1      1.1     0.17 |
sio            |   0.043    0.045    0.048      1.2      1.1      1.1     0.18 |
mit            |   0.041    0.042    0.044      1.1      1.1      1.1     0.17 |
ncl            |   0.041    0.043    0.045      1.1      1.1      1.1     0.17 |
igs            |   0.000    0.000    0.000      0.0      0.0      0.0     0.41 |
---------------|---------------------------------------------------------------|

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

               |      X        Y        Z  |    s X      s Y      s Z  |
               |    (mm)     (mm)     (mm) |    (mm)     (mm)     (mm) |
---------------|---------------------------|---------------------------|
igs            |     2.4     -0.3     -3.5 |     2.1      2.2      3.4 |
---------------|---------------------------|---------------------------|

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            |     ---        ---       ---       ---       ---       --- |
emr            |     ---       -2.3       3.5      24.0      -3.1       6.4 |
esa            |     ---        9.8      -1.3       4.0      -1.6     -16.1 |
gfz            |     ---       -5.7       0.2      -4.7      -1.0       8.1 |
jpl            |     ---        ---       0.6      25.8      -5.7      10.8 |
MIT            |     ---       -1.9       0.6     -14.6       3.5     -39.5 |
ngs            |     ---        6.1      -8.9      -5.2      -2.7      -5.1 |
sio            |     ---        1.5       7.0       ---      -4.2       --- |
mit            |     ---       16.9       5.0       9.4      -4.3       9.9 |
ncl            |     ---       -3.2       1.3       ---       2.8       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---        3.0       2.3       8.1      -3.6      10.2 |
---------------|------------------------------------------------------------|

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

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---        ---       ---       ---       ---       --- |
emr            |     ---        3.8       1.8      10.5       2.7       8.6 |
esa            |     ---       11.2       2.4       6.7       1.0       7.9 |
gfz            |     ---        3.6       1.9       5.2       1.8       6.1 |
jpl            |     ---        ---       1.3      18.2       1.7       6.1 |
MIT            |     ---        3.2       1.9       3.2       1.5       4.9 |
ngs            |     ---       14.0       4.5       9.4       6.0      14.3 |
sio            |     ---        7.0       3.9       ---       1.7       --- |
mit            |     ---        5.0       4.0       9.0       1.8       6.1 |
ncl            |     ---        3.7       1.3       ---       0.8       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       14.0       3.3       8.4       3.9       8.0 |
---------------|------------------------------------------------------------|

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       gfz14677.snx        |SCH2  A    1|   11.0     0.5   -13.9|
                                         |            |                       |
ITRF_IGS05.snx       MIT14677.snx        |SCH2  A    1|   10.3     0.3   -13.3|
ITRF_IGS05.snx       MIT14677.snx        |THU3  A    1|   -2.7     1.5   -25.1|
                                         |            |                       |
ITRF_IGS05.snx       sio14677.snx        |SCH2  A    1|   11.8     0.9   -13.1|
ITRF_IGS05.snx       sio14677.snx        |TSKB  A    2|    1.7    -0.8   -15.7|
                                         |            |                       |
ITRF_IGS05.snx       mit1467g.snx        |PDEL  A    1|   -7.7    -1.4    -0.6|
ITRF_IGS05.snx       mit1467g.snx        |SCH2  A    1|   10.3     0.4   -11.8|
ITRF_IGS05.snx       mit1467g.snx        |THU3  A    1|   -2.2     1.0   -23.5|
                                         |            |                       |
IGS08P07.snx         gfz14677.snx        |USUD  A    2|   10.9     4.1   -23.4|
                                         |            |                       |
IGS08P07.snx         mit1467g.snx        |USUD  A    2|   10.4     3.7   -30.2|
IGS08P07.snx         mit1467g.snx        |WUHN  A    4|   -8.9    -4.6     1.6|
                                         |            |                       |
IGS08P07.snx         ncl1467g.snx        |MAC1  A    7|  -10.0    -3.9     2.4|
IGS08P07.snx         ncl1467g.snx        |PETP  A    4|   13.6    -4.4   -15.2|
IGS08P07.snx         ncl1467g.snx        |YSSK  A    3|    0.2    11.1    -2.2|
                                         |            |                       |
IGS08P07.snx         igs08P1467.snx      |ALRT  A    1|   -1.7    -5.2   -13.8|
IGS08P07.snx         igs08P1467.snx      |SCH2  A    1|    9.0     0.5   -11.4|
IGS08P07.snx         igs08P1467.snx      |TWTF  A    2|   -2.7    -6.7    -8.2|
IGS08P07.snx         igs08P1467.snx      |USUD  A    2|   10.3     4.4   -30.4|
-----------------------------------------|------------|-----------------------|