Subject: [IGSREPORT-7310] Wk 1066 IGS SINEX Combination
From: Remi Ferland <[email-masked]>
To: [email-masked] (IGS Report Mailbox)
Date: Thu, 29 Jun 2000 15:55:03 EDT

******************************************************************************
IGS Electronic Report   29 Jun 12:55:10 PDT 2000      Message Number 7310
******************************************************************************

Author:  R. Ferland , D. Hutchison

===================================================================
 Combined AC  solution for GPS week 1066 -  00/06/11 to 00/06/17
===================================================================

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

igs00P1066.snx  Combined weekly solution. 
igs00P1066.erp  Daily Earth Rotation Parameters.
igs00p02.erp    Daily Earth Rotation Parameters since GPS week 1013.
IGS00P24.snx    Cumulative Combined solution. 
igs00P1066.sum  This file.
igs00P1066.itr  Residuals between the AC and the IGS97 for the RF stations. 
igs00P1066.res  Residuals between the AC and the Combined Weekly solution.
IGS00P24.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 = igs00P1066.snx
     IGS = IGS00P24.snx

     BuA = IERS Bulletin A

     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:
             esa  ZWEN

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

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            | 133 |  45 |        32.443 |         0.979 |        31.752 |
emr            |  36 |  20 |         3.543 |         1.000 |         3.542 |
esa            |  47 |  34 |         9.862 |         0.999 |         9.857 |
gfz            |  77 |  39 |        18.419 |         0.997 |        18.360 |
jpl            |  65 |  30 |         4.109 |         0.996 |         4.094 |
ngs            |  70 |  44 |        23.196 |         0.997 |        23.131 |
sio            | 139 |  43 |         2.171 |         0.995 |         2.159 |
ncl            |  76 |  43 |         2.641 |         0.883 |         2.333 |
igs            | 135 |  46 |         1.323 |         1.063 |         1.407 |
---------------|-----|-----|---------------|---------------|---------------|

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

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod         44 |    -0.9     -0.6      0.1 |     3.1      3.3     11.4 |
emr         19 |    -0.7      0.4      0.3 |     4.5      3.5      8.9 |
esa         31 |    -0.2     -0.6      0.4 |     6.0      5.0     11.5 |
gfz         37 |     1.0     -0.2      0.2 |     2.4      2.9      8.3 |
jpl         29 |    -0.8      0.4      0.2 |     2.6      3.2      9.8 |
ngs         42 |     0.0     -0.3      0.1 |     4.2      6.4      9.6 |
sio         42 |     0.8     -0.2     -0.6 |     3.2      3.1      8.6 |
ncl         42 |     0.4      0.0      0.2 |     2.3      3.3      6.8 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        125 |    -1.3      0.0      0.8 |     2.4      2.3     10.4 |
emr         35 |    -1.6      0.9      1.9 |     5.0      4.9      6.3 |
esa         47 |    -0.4     -0.9      1.0 |     5.0      4.1      8.8 |
gfz         72 |     0.9     -0.2     -0.4 |     1.9      1.6      6.4 |
jpl         60 |    -1.3     -0.2      0.2 |     2.1      1.2      5.4 |
ngs         69 |    -0.3     -1.3     -1.4 |     3.7      6.4      8.7 |
sio        123 |     0.2     -0.4     -0.1 |     2.2      2.7      5.5 |
ncl         74 |     0.0     -0.1      0.2 |     1.1      1.5      3.7 |
ITR         45 |    -0.6      0.0     -0.3 |     2.1      3.0      7.9 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        126 |    -1.5      0.1      1.0 |     3.7      3.6     11.7 |
emr         35 |    -1.1      0.5      2.9 |     4.9      6.3      8.8 |
esa         47 |    -0.4     -0.3      1.2 |     6.2      5.2     10.8 |
gfz         72 |     1.0     -0.4      0.2 |     2.4      3.0      9.1 |
jpl         60 |    -1.0      0.0      1.6 |     2.6      2.6      9.1 |
ngs         69 |    -0.2     -1.3     -1.2 |     4.4      6.9     10.1 |
sio        124 |     0.2     -0.5      0.2 |     3.1      3.8      7.6 |
ncl         74 |     0.2     -0.2      1.0 |     2.0      3.0      6.4 |
igs        135 |    -0.1     -0.1      0.4 |     2.3      2.7      6.2 |
ITR         51 |     0.0      0.1     -0.1 |     0.5      0.9      2.0 |
---------------|---------------------------|---------------------------|

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            |   0.038   -0.021    0.049      8.4     -2.5      6.2     2.59 |
emr            |  -0.044    0.015    0.000     24.8     -1.4    -57.7     1.68 |
esa            |  -0.008    0.106   -0.062     -5.1      9.6     19.8     0.60 |
gfz            |  -0.079    0.011    0.042     -1.6      1.4     -3.9     1.16 |
jpl            |   0.002   -0.052   -0.024     -1.7      7.3    -18.4     1.84 |
ngs            |  -0.212   -0.110    0.188      9.9    -17.3     18.9     2.95 |
sio            |  -0.119   -0.026    0.357      7.6     -3.5     45.7     1.74 |
ncl            |  -0.206    0.120   -0.276     12.8     -4.1     -8.1     1.44 |
---------------|---------------------------------------------------------------|

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    0.061    0.066      1.5      1.5      1.5     0.24 |
emr            |   0.088    0.091    0.102      2.3      2.3      2.3     0.36 |
esa            |   0.074    0.074    0.080      1.9      1.9      1.9     0.29 |
gfz            |   0.065    0.066    0.074      1.7      1.7      1.7     0.26 |
jpl            |   0.072    0.072    0.080      1.9      1.9      1.9     0.29 |
ngs            |   0.061    0.063    0.069      1.6      1.6      1.6     0.25 |
sio            |   0.061    0.062    0.069      1.6      1.6      1.6     0.25 |
ncl            |   0.060    0.063    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            |     3.9      3.9     -6.3 |     5.8      5.7      7.6 |
---------------|---------------------------|---------------------------|

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            |     ---       -3.9      -4.7       2.3       4.6       -.8 |
emr            |     ---       19.5      -3.8     -18.6       8.3      14.7 |
esa            |     ---        9.9      -3.7       4.4     -20.9       1.6 |
gfz            |     ---      -10.4       6.0        .8       5.6       5.3 |
jpl            |     ---        7.4       -.5     -27.9       1.0      31.8 |
ngs            |     ---      177.4     -42.1     -85.9      23.9     -58.3 |
sio            |     ---      -18.0       2.0     -11.4       7.0       2.8 |
ncl            |     ---        ---       ---       ---       ---       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       -7.2       4.5       2.2      20.8       3.3 |
---------------|------------------------------------------------------------|

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

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---       16.5       4.0       6.4       3.0       6.8 |
emr            |     ---       17.8       5.3      23.2      17.1      24.8 |
esa            |     ---       17.8       6.4      23.4       7.5      11.9 |
gfz            |     ---       17.8       3.4      13.3       3.7       8.6 |
jpl            |     ---       13.2       1.9       9.2       3.5      26.4 |
ngs            |     ---      230.1      22.9      43.3      14.0      74.7 |
sio            |     ---       26.7       6.3      21.1       2.5      12.2 |
ncl            |     ---        ---       ---       ---       ---       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       29.7       4.4      16.7       4.1      15.4 |
---------------|------------------------------------------------------------|

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

Thresholds set at 5 sigmas and 50 mm.

 Solution             Solution           |  Station   |    N       E       U  |
              Minus                      |code id soln|   (mm)    (mm)    (mm)|
-----------------------------------------|------------|-----------------------|
                                         |            |                       |
ITRF_IGS00P04_RS51.s gfz10667.snx        |ZWEN  A ----|   36.2   -40.9    37.4|
                                         |            |                       |
ITRF_IGS00P04_RS51.s ngs10667.snx        |ZWEN  A ----|   38.3   -34.9    17.1|
                                         |            |                       |
ITRF_IGS00P04_RS51.s sio10667.snx        |ZWEN  A ----|   38.7   -51.9    37.7|
                                         |            |                       |
ITRF_IGS00P04_RS51.s ncl1066g.snx        |ZWEN  A ----|   37.9   -34.7    21.6|
                                         |            |                       |
cod10667.snx         ngs10667.snx        |BAKO  A ----|   -5.6     0.8    55.5|
                                         |            |                       |
esa10667.snx         gfz10667.snx        |MALI  A ----|    4.7   -19.7   -50.2|
                                         |            |                       |
esa10667.snx         ngs10667.snx        |SANT  A ----|  -19.9    -7.4   -56.1|
                                         |            |                       |
ngs10667.snx         sio10667.snx        |BAKO  A ----|    5.7     5.2   -62.1|
                                         |            |                       |
IGS00P23.snx         cod10667.snx        |LAMA  A ----|   24.1   -14.8    -1.2|
                                         |            |                       |
IGS00P23.snx         gfz10667.snx        |ARTU  A ----|    3.0    -2.2   -42.0|
                                         |            |                       |
IGS00P23.snx         jpl10667.snx        |ARTU  A ----|    1.1     0.0   -41.2|
                                         |            |                       |
IGS00P23.snx         sio10667.snx        |ANKR  A ----|   -9.7    20.4   -11.3|
IGS00P23.snx         sio10667.snx        |LAMA  A ----|   26.9   -17.7   -13.3|
                                         |            |                       |
IGS00P23.snx         ncl1066g.snx        |ARTU  A ----|    1.1    -1.5   -33.5|
                                         |            |                       |
IGS00P23.snx         igs00P1066.snx      |MADR  A ----|    5.1    12.2     7.5|
-----------------------------------------|------------|-----------------------|

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

IERS DOMES NO    cod    emr    esa    gfz    jpl    ngs    sio    IGS    igs
============= ====== ====== ====== ====== ====== ====== ====== ====== ======
    31303M002 MAS1 A MAS1 A MASP A MAS1 A MAS1 A MAS1 A MAS1 A MAS1 A MAS1 A
    13407S012 MAD2 A                                    MAD2 A MADR A 
    12353M001 YAKZ A                             YAKZ A YAKZ A YAKA A YAKA A
    42202M005 AREQ A AREQ A AREQ A AREQ A AREQ A AREQ B AREQ A AREQ A AREQ A
    40405S031 GOL2 A        GOL2 A GOL2 A GOL2 A GOL2 A GOL2 A GOLD A GOLD A
    42005M001 GALA A        GALA B GALA A GALA A GALA B GALA A GALA A GALA A
    50103M108 TID2 A        TID2 A TID2 A TID1 A TID2 A TID2 A TIDB A TIDB A
                                          TID2 A
    22306M002               IISC B IISC A        IISC B IISC A IISC A IISC A
 
MISSING IERS DOMES NOS AT gfz:
-----------------------------
  BISH A
IERS DOMES NO    ncl    IGS    igs
============= ====== ====== ======
    40405S031 GOL2 A GOLD A GOLD A
    50103M108 TID2 A TIDB A TIDB A
--