Subject: [IGSREPORT-7939] Wk 1096 IGS SINEX Combination
From: David Hutchison <[email-masked]>
To: [email-masked]
Date: Thu, 25 Jan 2001 22:54:36 EST

******************************************************************************
IGS Electronic Report   25 Jan 19:54:39 PST 2001      Message Number 7939
******************************************************************************

Author:  R. Ferland , D. Hutchison

===================================================================
 Combined AC  solution for GPS week 1096 -  01/01/07 to 01/01/13
===================================================================

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

igs01P1096.snx  Combined weekly solution. 
igs01P1096.erp  Daily Earth Rotation Parameters.
igs00p02.erp    Daily Earth Rotation Parameters since GPS week 1013.
IGS01P02.snx    Cumulative Combined solution. 
igs01P1096.sum  This file.
igs01P1096.itr  Residuals between the AC and the IGS97 for the RF stations. 
igs01P1096.res  Residuals between the AC and the Combined Weekly solution.
IGS01P02.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 = igs01P1096.snx
     IGS = IGS01P02.snx

     BuA = IERS Bulletin A

     ncl mit 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:
             emr  NRC1  NRC2

     New stations in the cumulative solution IGS01P02.snx
                  SLOR A ---- 

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

     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            | 128 |  44 |        44.500 |         1.000 |        44.500 |
emr            |  48 |  34 |         3.811 |         1.000 |         3.811 |
esa            |  55 |  39 |        14.883 |         1.000 |        14.883 |
gfz            |  75 |  39 |        27.825 |         1.000 |        27.825 |
jpl            |  63 |  31 |         5.562 |         1.000 |         5.562 |
ngs            |  78 |  49 |        28.272 |         1.000 |        28.272 |
sio            | 135 |  47 |         3.179 |         1.000 |         3.179 |
ncl            | 102 |  50 |         3.959 |         1.000 |         3.959 |
mit            | 159 |  47 |         5.994 |         1.072 |         6.424 |
igs            | 136 |  50 |         1.490 |         1.000 |         1.490 |
---------------|-----|-----|---------------|---------------|---------------|

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

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod         43 |     0.0     -0.1     -0.8 |     2.9      2.7     10.5 |
emr         33 |    -2.1     -1.1      0.2 |     6.0      7.7     11.2 |
esa         38 |    -2.3     -1.3     -0.2 |     6.8      6.9     13.3 |
gfz         38 |    -1.7     -0.1      0.5 |     3.2      4.2      9.8 |
jpl         30 |    -2.1      0.1     -0.5 |     3.6      4.6     10.2 |
ngs         48 |    -1.9     -0.2     -0.2 |     4.9      7.3     10.2 |
sio         46 |    -0.8      0.1     -0.2 |     3.4      4.3     12.9 |
ncl         49 |    -0.8     -0.5      0.0 |     2.6      3.4      7.3 |
mit         46 |    -0.2     -0.4     -1.0 |     2.7      3.2      8.6 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        120 |     1.2      0.4     -0.6 |     1.9      2.8      8.5 |
emr         45 |    -1.1      0.3     -0.5 |     5.2      6.8     10.5 |
esa         54 |    -1.1     -0.3     -0.9 |     6.2      5.9      9.1 |
gfz         69 |    -0.4      0.3      1.5 |     2.3      1.9      6.0 |
jpl         59 |    -1.4     -0.4     -0.2 |     3.1      2.4      5.7 |
ngs         77 |    -1.2      0.1     -1.9 |     4.2      7.0      9.5 |
sio        116 |     0.4      0.4      1.2 |     2.5      2.9      8.9 |
ncl         96 |     0.5     -0.3      0.5 |     1.2      1.3      3.5 |
mit        129 |     1.0     -0.1     -0.9 |     1.3      1.1      4.1 |
ITR         49 |     1.0      0.1     -0.2 |     2.6      3.8      8.0 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        121 |    -0.5      0.0      0.6 |     3.8      4.5     10.6 |
emr         45 |    -2.7      0.1      1.0 |     5.8      8.5      9.8 |
esa         55 |    -2.4      0.1     -1.2 |     7.0      7.6     12.2 |
gfz         69 |    -1.8      0.4      3.5 |     3.4      3.5     10.0 |
jpl         59 |    -2.6      0.2      1.0 |     3.8      3.9      9.7 |
ngs         77 |    -3.1     -0.2     -0.7 |     5.6      8.6     10.2 |
sio        117 |    -1.4      0.2      2.3 |     4.3      4.6     13.7 |
ncl         97 |    -1.2     -0.1      2.2 |     3.2      3.5      7.5 |
mit        130 |    -0.5     -0.4      0.5 |     3.4      2.8      8.1 |
igs        136 |    -1.5     -0.3      1.3 |     3.1      3.5      7.9 |
ITR         51 |    -0.1      0.1     -0.2 |     1.0      1.6      4.5 |
---------------|---------------------------|---------------------------|

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            |   0.000   -0.017    0.014      5.5      1.6     -9.7     1.80 |
emr            |   0.134    0.015   -0.072      6.3     -1.5      0.8     0.64 |
esa            |   0.063    0.001   -0.021      0.3     23.5      0.1     2.34 |
gfz            |  -0.024   -0.029    0.062     -0.2     -0.7     -3.0     1.31 |
jpl            |  -0.004   -0.013    0.018      4.7      9.7    -46.4     2.12 |
ngs            |   0.211    0.165   -0.037    -12.0     28.8     29.2     3.86 |
sio            |  -0.029    0.232    0.090     13.0      2.4     75.2     2.23 |
ncl            |  -0.059    0.071   -0.271     13.8     -4.7    -12.3     1.55 |
mit            |  -0.001   -0.014   -0.007      0.2      0.6     -0.7     1.81 |
---------------|---------------------------------------------------------------|

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            |   0.060    0.063    0.068      1.6      1.6      1.6     0.25 |
emr            |   0.069    0.069    0.076      1.8      1.8      1.8     0.28 |
esa            |   0.066    0.064    0.071      1.7      1.7      1.7     0.26 |
gfz            |   0.063    0.064    0.074      1.7      1.7      1.7     0.26 |
jpl            |   0.071    0.071    0.079      1.9      1.8      1.8     0.29 |
ngs            |   0.057    0.058    0.064      1.5      1.5      1.5     0.23 |
sio            |   0.058    0.059    0.065      1.5      1.5      1.5     0.24 |
ncl            |   0.057    0.058    0.064      1.5      1.5      1.5     0.23 |
mit            |   0.059    0.059    0.067      1.5      1.5      1.5     0.24 |
---------------|---------------------------------------------------------------|

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

               |      X        Y        Z  |    s X      s Y      s Z  |
               |    (mm)     (mm)     (mm) |    (mm)     (mm)     (mm) |
---------------|---------------------------|---------------------------|
igs            |     4.0      8.6    -34.5 |     8.4      8.5     11.7 |
---------------|---------------------------|---------------------------|

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            |     ---        4.2       -.7        .4       2.1        .1 |
emr            |     ---        -.5       9.1      -8.5      -4.8       7.1 |
esa            |     ---        1.6      -6.8      -1.2     -20.4       1.2 |
gfz            |     ---        3.7       2.1      -2.7       3.6      -2.3 |
jpl            |     ---        6.6        .5      -7.5       7.5       2.9 |
ngs            |     ---       -7.4     -21.3      44.0      -5.1     -48.5 |
sio            |     ---      -21.0       6.8       7.4       4.2      22.1 |
ncl            |     ---        ---       ---       ---       ---       --- |
mit            |     ---        1.3      -1.4       -.4      -4.7        .0 |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---      -13.6      -7.7       -.6      29.7        .6 |
---------------|------------------------------------------------------------|

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

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---       12.4       2.5      10.5       3.1       8.0 |
emr            |     ---        4.9       6.5      23.5       6.7      32.2 |
esa            |     ---       15.3       4.5      11.2       3.0       8.5 |
gfz            |     ---       17.0       1.6       9.8       2.4       4.5 |
jpl            |     ---       34.9       4.4      15.6       3.2      12.6 |
ngs            |     ---       32.7       8.2      37.6       8.2      80.4 |
sio            |     ---       17.4       3.5      16.5       5.7      25.0 |
ncl            |     ---        ---       ---       ---       ---       --- |
mit            |     ---        3.6        .9       2.7        .9       1.9 |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       17.0       4.8      10.4       3.6      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)|
-----------------------------------------|------------|-----------------------|
                                         |            |                       |
ngs10967.snx         sio10967.snx        |BAKO  A ----|    7.4    -7.6   -56.5|
                                         |            |                       |
IGS01P01.snx         cod10967.snx        |BILI  A ----|   27.6     5.1   -89.6|
                                         |            |                       |
IGS01P01.snx         gfz10967.snx        |BILI  A ----|   26.6     7.6   -94.2|
IGS01P01.snx         gfz10967.snx        |COCO  A ----|    4.3   -30.8   -12.2|
                                         |            |                       |
IGS01P01.snx         gfz10967.snx        |MADR  A ----|  -11.6   -18.6    18.8|
                                         |            |                       |
IGS01P01.snx         jpl10967.snx        |SIO3  A ----|   -0.2     4.7    78.1|
                                         |            |                       |
IGS01P01.snx         sio10967.snx        |BILI  A ----|   26.4    10.7   -87.2|
                                         |            |                       |
IGS01P01.snx         ncl1096g.snx        |BILI  A ----|   28.8     7.3   -90.9|
                                         |            |                       |
IGS01P01.snx         ncl1096g.snx        |COCO  A ----|    6.2   -32.6     1.0|
                                         |            |                       |
IGS01P01.snx         mit1096g.snx        |BILI  A ----|   27.5     6.6   -93.6|
                                         |            |                       |
IGS01P01.snx         mit1096g.snx        |ANKR  A ----|   -9.0    14.4   -16.1|
IGS01P01.snx         mit1096g.snx        |COCO  A ----|    7.6   -34.7     5.3|
IGS01P01.snx         mit1096g.snx        |SIO3  A ----|    4.3     4.8    73.1|
                                         |            |                       |
IGS01P01.snx         igs01P1096.snx      |ANKR  A ----|  -10.1    14.0   -10.4|
-----------------------------------------|------------|-----------------------|

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

5-7-1) Station Name Conflicts:
============================= 

IERS DOMES NO    cod    emr    esa    gfz    jpl    ngs    sio    IGS    igs
============= ====== ====== ====== ====== ====== ====== ====== ====== ======
    42005M001 GALA A        GALA B GALA A GALA A GALA B GALA A GALA A GALA A
    42202M005 AREQ A AREQ A AREQ A AREQ A AREQ A AREQ B AREQ A AREQ A AREQ A
    31303M002 MAS1 A MAS1 A MASP A MAS1 A MAS1 A MAS1 A MAS1 A MAS1 A MAS1 A
    12353M001 YAKZ A                             YAKZ A YAKZ A YAKA A YAKA A
    13407S012 MADR A               MADR A        MADR A MAD2 A MADR A MADR A
                                                        MADR A              
    40405S031 GOLD A        GOL2 A GOLD A        GOL2 A GOL2 A GOLD A GOLD A
    40114M001 NRC1 A NRC1 A NRC1 A NRC1 A NRC1 A        NRC1 A NRC1 A NRC1 A
                     NRC2 A                                                 
    50103M108 TIDB A        TID2 A TIDB A TIDB A TID2 A TID2 A TIDB A TIDB A
    22306M002 IISC A        IISC B IISC A IISC A IISC B IISC A IISC A IISC A
 
MISSING IERS DOMES NOS AT gfz:
-----------------------------
  BISH A

IERS DOMES NO    mit    ncl    IGS    igs
============= ====== ====== ====== ======
    13407S012 MADR A MADR A MADR A MADR A
              MAD2 A                     
    31303M001 MAS1 A                     
    31303M002        MAS1 A MAS1 A MAS1 A
    40114M001 NRC1 A NRC1 A NRC1 A NRC1 A
              NRC2 A                     
    40405S031 GOLD A GOL2 A GOLD A GOLD A
              GOL2 A                     
    50103M108 TIDB A TID2 A TIDB A TIDB A
              TID2 A TIDB A              
    12353M001 YAKZ A YAKZ A YAKA A YAKA A
    12309M001 MDVO A                     
    12309M002               MDVO A MDVO A
 
MISSING IERS DOMES NOS AT mit:
-----------------------------
  BISH A

5-7-2) Station Antenna Conflicts:
================================ 

 _______________________ 
|Enforcing these aliases|
|_______________________|
   YAKA A: YAKZ A  
   NRC1 A: NRC2 A  
   GOLD A: GOL2 A  
   TIDB A: TID2 A  
   IISC A: IISC B  
   GALA A: GALA B  
   MAS1 A: MASP A  
   AREQ A: AREQ B  
   MADR A: MAD2 A  

ABBREVIATIONS:
-------------
    L1: L1 Offset
    L2: L2 Offset
   ECC: Eccentricity
    -N: NORTH (Latitude) 
    -E: EAST  (Longitude)
    -U: UP    (Vertical) 

Compare to file IGS.SNX (IGS).                

Antenna Conflicts in file cod10967.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 MDVO  A  .0780  .0000 -.0030  .0744 -.0031 -.0013  .1456  .0000  .0000
IGS MDVO  A  .0960 -.0016  .0009  .0944  .0016  .0041  .1456  .0000  .0000

Antenna Conflicts in file ngs10967.snx (ngs).           
------- --------- -- ---- 
    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.)
=== ==== ==   ====   ====   ====   ====   ====   ====   ====   ====   ====
ngs BAKO  A  .0757  .0000  .0000  .0745  .0000  .0000 1.6760  .0000  .0000
IGS BAKO  A  .0780  .0000 -.0030  .0744 -.0031 -.0013 1.6160  .0000  .0000

ngs WUHN  A  .1081  .0000  .0000  .1256  .0000  .0000 2.3200  .0000  .0000
IGS WUHN  A  .1100  .0000  .0000  .1280  .0000  .0000 2.3200  .0000  .0000

The following files have no antenna conflicts: 
   - emr10967.snx (emr)            
   - esa10967.snx (esa)            
   - gfz10967.snx (gfz)            
   - jpl10967.snx (jpl)            
   - mit1096g.snx (mit)            
   - ncl1096g.snx (ncl)            
   - sio10967.snx (sio)            
--