Subject: [IGSREPORT-7264] Wk 1064 IGS SINEX Combination
From: Remi Ferland <[email-masked]>
To: [email-masked] (IGS Report Mailbox)
Date: Thu, 15 Jun 2000 16:42:28 EDT

******************************************************************************
IGS Electronic Report   15 Jun 13:42:39 PDT 2000      Message Number 7264
******************************************************************************

Author:  R. Ferland , D. Hutchison

===================================================================
 Combined AC  solution for GPS week 1064 -  00/05/28 to 00/06/03
===================================================================

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

igs00P1064.snx  Combined weekly solution. 
igs00P1064.erp  Daily Earth Rotation Parameters.
igs00p02.erp    Daily Earth Rotation Parameters since GPS week 1013.
IGS00P22.snx    Cumulative Combined solution. 
igs00P1064.sum  This file.
igs00P1064.itr  Residuals between the AC and the ITRF97 for the RF stations.
igs00P1064.res  Residuals between the AC and the Combined Weekly solution.
IGS00P22.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
     ITRF97 Reference Frame (RF) stations at the current epoch.
     ftp://igscb.jpl.nasa.gov/igscb/station/coord/ITRF97_IGS_RS51.SNX.Z
3-4) The AC are compared to ITRF, 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 ITRF97 of the current
     epoch using a 7-parameters transformation. The singular cumulative
     combined solution is aligned to the ITRF97 of the reference epoch
     using a 14-parameters transformation and the 51 ITRF station positions
     and velocities.

     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:
===========

     igs = igs00P1064.snx
     IGS = IGS00P22.snx

     JPL = jpl1064g.snx
     jpl = jpl10647.snx

     BuA = IERS Bulletin A

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

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            | 115 |  39 |        35.216 |         1.000 |        35.216 |
emr            |  37 |  19 |         3.963 |         1.000 |         3.962 |
esa            |  48 |  36 |        12.093 |         1.000 |        12.093 |
gfz            |  70 |  35 |        20.169 |         1.000 |        20.169 |
jpl            |  71 |  33 |         3.857 |         1.000 |         3.857 |
ngs            |  68 |  45 |        21.870 |         1.000 |        21.870 |
JPL            | 133 |  44 |         2.184 |         1.056 |         2.307 |
ncl            |  74 |  43 |         2.659 |         1.000 |         2.659 |
igs            | 129 |  45 |         1.299 |         1.000 |         1.299 |
---------------|-----|-----|---------------|---------------|---------------|

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

5-2-1)    With respect to ITRF97 Reference Frame stations:
=========================================================

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod         38 |    -0.9     -0.3      1.2 |     3.3      5.3     11.2 |
emr         18 |    -2.3      0.4      2.4 |     5.2      5.6     15.7 |
esa         33 |    -4.1     -0.1      0.1 |     6.9      5.6     13.6 |
gfz         34 |     0.5     -0.4      1.0 |     3.3      5.3     12.5 |
jpl         32 |    -1.6     -0.2      1.6 |     4.3      5.2     14.0 |
ngs         42 |    -2.6      0.3      0.8 |     5.2      6.8     14.8 |
JPL         43 |    -0.5      0.0      1.2 |     3.3      4.2     12.0 |
ncl         42 |     0.5     -0.2      0.7 |     2.8      4.3      7.0 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        109 |     0.3      0.5      0.8 |     3.0      2.6      8.9 |
emr         36 |    -1.2     -1.1      5.1 |     4.4      6.4      5.9 |
esa         48 |    -2.7     -1.4     -0.7 |     4.2      4.2      8.8 |
gfz         66 |     1.7     -0.3     -0.9 |     2.3      2.1      5.0 |
jpl         66 |    -0.6     -0.9      1.2 |     2.2      2.2      4.3 |
ngs         67 |    -0.7     -0.1      1.6 |     5.5      5.9      8.0 |
JPL        125 |     0.7      0.5      0.9 |     1.5      1.6      3.4 |
ncl         71 |     1.5      0.0      2.2 |     1.7      1.1      6.5 |
ITR         44 |     0.1      0.3     -1.4 |     7.8      4.6     11.7 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        110 |    -1.3      0.4     -0.7 |     4.8      4.4     10.4 |
emr         36 |    -1.6     -1.4      4.8 |     4.2      6.8      9.1 |
esa         48 |    -4.1     -0.8     -1.9 |     7.0      5.6      9.6 |
gfz         66 |     0.4     -0.2     -3.7 |     2.7      3.2      8.8 |
jpl         66 |    -1.1     -0.9     -0.3 |     2.9      3.3      9.6 |
ngs         67 |    -1.8      0.0     -0.4 |     5.7      6.2      9.3 |
JPL        126 |    -0.7      0.3     -0.9 |     3.3      2.4      8.8 |
ncl         71 |     0.7     -0.2      0.4 |     2.8      2.0      8.4 |
igs        129 |    -1.3      0.0     -1.7 |     3.5      2.6      7.9 |
ITR         51 |     0.6      0.4     -1.6 |     2.8      3.8     10.7 |
---------------|---------------------------|---------------------------|

5-3)      7-Parameters Transformation: AC ----> ITRF97_IGS_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            |   0.004    0.043   -0.032      5.8     -5.7    -11.6     2.75 |
emr            |  -0.010    0.009   -0.012     19.4     -4.4    -15.7     1.42 |
esa            |   0.076   -0.012    0.028      1.1     13.4     25.1     0.82 |
gfz            |  -0.107    0.033   -0.079     -0.6      1.2     -5.3     1.83 |
jpl            |   0.026   -0.024    0.047     12.5     -1.8    -20.3     2.26 |
ngs            |  -0.205   -0.258    0.237     11.6    -13.9    -22.4     1.93 |
JPL            |  -0.026    0.006    0.042     -1.5      0.5     -7.0     2.11 |
ncl            |  -0.025   -0.002    0.016     -0.1      0.5     -3.6     0.97 |
---------------|---------------------------------------------------------------|

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            |   0.064    0.066    0.074      1.7      1.7      1.6     0.26 |
emr            |   0.091    0.092    0.108      2.4      2.4      2.4     0.38 |
esa            |   0.075    0.070    0.079      1.8      1.9      1.8     0.28 |
gfz            |   0.067    0.069    0.080      1.8      1.8      1.8     0.28 |
jpl            |   0.068    0.071    0.076      1.8      1.8      1.8     0.28 |
ngs            |   0.062    0.063    0.071      1.6      1.6      1.6     0.25 |
JPL            |   0.060    0.061    0.068      1.6      1.6      1.6     0.24 |
ncl            |   0.061    0.062    0.070      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            |     6.6      1.8    -13.7 |     6.2      6.2      7.9 |
---------------|---------------------------|---------------------------|

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            |     ---       29.0      -2.8        .3       4.4      -3.0 |
emr            |     ---       31.0      -7.0      21.5      17.2      -3.6 |
esa            |     ---       13.1       3.5        .6     -28.4      -1.1 |
gfz            |     ---        3.1       5.6       1.2       5.5       2.4 |
jpl            |     ---      -23.3      -4.7       6.1       5.4      22.7 |
ngs            |     ---     -152.5     -11.1     -36.2      36.2      61.2 |
JPL            |     ---        ---       ---       ---       ---       --- |
ncl            |     ---        ---       ---       ---       ---       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       20.0      11.1       2.3      23.5      -3.8 |
---------------|------------------------------------------------------------|

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

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---       30.0       2.7       9.4       4.9      16.1 |
emr            |     ---       27.7       5.5      49.7      11.1      15.8 |
esa            |     ---        7.9       1.6      17.6       6.4      14.9 |
gfz            |     ---       12.7       3.4      10.5       4.1       7.7 |
jpl            |     ---       31.0       3.3      24.4       2.5      17.7 |
ngs            |     ---      178.5      24.6      58.6      13.3      54.5 |
JPL            |     ---        ---       ---       ---       ---       --- |
ncl            |     ---        ---       ---       ---       ---       --- |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       13.9       4.7      12.7       3.2      18.1 |
---------------|------------------------------------------------------------|

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

Thresholds set at 5 sigmas and 50 mm.

 Solution             Solution           |  Station   |    N       E       U  |
              Minus                      |code id soln|   (mm)    (mm)    (mm)|
-----------------------------------------|------------|-----------------------|
                                         |            |                       |
ITRF97_IGS_RS51.snx  gfz10647.snx        |ZWEN  A ----|   58.2   -18.2    34.1|
                                         |            |                       |
ITRF97_IGS_RS51.snx  ngs10647.snx        |ZWEN  A ----|   52.1   -17.6    23.8|
                                         |            |                       |
ITRF97_IGS_RS51.snx  JPL1064g.snx        |GOLD  A ----|    2.5    12.4    -7.1|
ITRF97_IGS_RS51.snx  JPL1064g.snx        |ZWEN  A ----|   53.7   -16.6    26.7|
                                         |            |                       |
ITRF97_IGS_RS51.snx  ncl1064g.snx        |ZWEN  A ----|   38.7    -5.7    14.1|
                                         |            |                       |
esa10647.snx         ngs10647.snx        |SANT  A ----|  -35.6   -29.8   -62.0|
                                         |            |                       |
esa10647.snx         ngs10647.snx        |AREQ  A ----|  -26.5   -17.5   -51.6|
                                         |            |                       |
emr10647.snx         ngs10647.snx        |EISL  A ----|    9.4   -51.7   -14.9|
                                         |            |                       |
esa10647.snx         ngs10647.snx        |LPGS  A ----|  -43.7   -20.2   -52.6|
                                         |            |                       |
igs00P1063.snx       esa10647.snx        |CRO1  A ----|   -1.5    -0.5    51.8|
                                         |            |                       |
IGS00P21.snx         gfz10647.snx        |ARTU  A ----|    2.9    -0.4   -44.6|
                                         |            |                       |
IGS00P21.snx         jpl10647.snx        |ARTU  A ----|   -2.4    -1.0   -37.8|
                                         |            |                       |
IGS00P21.snx         JPL1064g.snx        |ANKR  A ----|  -15.0    23.3    -5.2|
IGS00P21.snx         JPL1064g.snx        |LAMA  A ----|   22.4   -21.9    -3.9|
                                         |            |                       |
IGS00P21.snx         igs00P1064.snx      |LAMA  A ----|   20.3   -22.4    -6.8|
-----------------------------------------|------------|-----------------------|

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

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