Subject: [IGSREPORT-7702] Wk 1084 IGS SINEX Combination
From: David Hutchison <[email-masked]>
To: [email-masked]
Date: Thu, 02 Nov 2000 16:53:17 EST

******************************************************************************
IGS Electronic Report   02 Nov 17:06:19 PST 2000      Message Number 7702
******************************************************************************

Author:  D. Hutchison, R. Ferland

===================================================================
 Combined AC  solution for GPS week 1084 -  00/10/15 to 00/10/21
===================================================================

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

igs00P1084.snx  Combined weekly solution. 
igs00P1084.erp  Daily Earth Rotation Parameters.
igs00p02.erp    Daily Earth Rotation Parameters since GPS week 1013.
IGS00P42.snx    Cumulative Combined solution. 
igs00P1084.sum  This file.
igs00P1084.itr  Residuals between the AC and the IGS97 for the RF stations. 
igs00P1084.res  Residuals between the AC and the Combined Weekly solution.
IGS00P42.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 = igs00P1084.snx
     IGS = IGS00P42.snx

     BuA = IERS Bulletin A

     emr gfz ngs sio excluded from the geocenter estimation (Sec. 5-4).

     New stations in the cumulative solution IGS00P42.snx
                  NRIL A ---- RBAY 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 |  46 |        29.440 |         1.001 |        29.461 |
emr            |  50 |  36 |         2.539 |         0.999 |         2.537 |
esa            |  55 |  40 |         8.014 |         0.999 |         8.005 |
gfz            |  75 |  40 |        22.521 |         0.999 |        22.493 |
jpl            |  67 |  32 |         3.350 |         1.000 |         3.351 |
ngs            |  74 |  48 |        20.813 |         0.995 |        20.716 |
sio            | 137 |  47 |         2.056 |         0.955 |         1.963 |
igs            | 139 |  50 |         1.313 |         1.055 |         1.386 |
---------------|-----|-----|---------------|---------------|---------------|

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         45 |     1.1      0.8     -0.1 |     3.1      3.9     10.0 |
emr         35 |     0.4     -1.6      0.0 |     3.5      6.3     10.6 |
esa         38 |    -1.4      0.6      0.4 |     4.7      3.8     11.2 |
gfz         39 |     2.1      0.1     -0.2 |     2.4      3.4      8.3 |
jpl         31 |    -0.3      1.0      0.8 |     3.0      3.9      9.9 |
ngs         46 |    -3.2      0.6     -0.2 |     4.5      5.0     11.6 |
sio         46 |     0.6     -0.2     -1.0 |     2.5      4.0      9.4 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        121 |     0.0      0.9      0.1 |     3.1      2.7      9.3 |
emr         48 |    -0.5     -0.8      0.1 |     2.9      6.1      5.7 |
esa         55 |    -2.1      0.7      1.1 |     4.6      4.7      8.5 |
gfz         71 |     1.4     -0.2     -0.6 |     1.9      1.7      5.8 |
jpl         64 |    -0.9      0.9      0.5 |     1.8      1.9      5.2 |
ngs         72 |    -3.5      0.2      1.1 |     5.0      6.7     10.1 |
sio        126 |     0.1     -0.2     -0.4 |     1.7      2.4      5.8 |
ITR         49 |    -0.8      0.0     -0.1 |     1.8      3.0      8.6 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        122 |     0.6      0.7      0.7 |     3.6      4.3      9.2 |
emr         49 |     0.4     -1.2      0.4 |     3.4      7.6      8.9 |
esa         55 |    -1.7      0.6      1.2 |     4.3      4.6     10.5 |
gfz         71 |     1.8      0.1      0.6 |     2.5      2.9      8.0 |
jpl         64 |    -0.6      1.3      1.7 |     2.5      3.1      8.4 |
ngs         73 |    -2.8      0.3      1.9 |     5.4      8.1     11.6 |
sio        126 |     0.6     -0.2      0.3 |     2.4      3.5      8.9 |
igs        139 |     0.5      0.1      0.7 |     1.7      2.3      6.2 |
ITR         51 |    -0.1      0.1     -0.2 |     0.9      1.3      3.9 |
---------------|---------------------------|---------------------------|

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            |   0.014   -0.024    0.013     -6.0     -7.2    -15.3     2.65 |
emr            |   0.009   -0.038   -0.007     -0.7      4.9    -35.1     1.78 |
esa            |   0.056   -0.002   -0.020     -8.3     17.0    -10.4     1.37 |
gfz            |  -0.045    0.006    0.000     -0.0      0.7     -2.7     1.33 |
jpl            |  -0.024   -0.026   -0.086     -2.7      4.2    -33.7     1.83 |
ngs            |  -0.280    0.003    0.110     -1.1    -22.7     19.3     2.31 |
sio            |  -0.154    0.269    0.086     -1.6     -5.6     59.2     2.06 |
---------------|---------------------------------------------------------------|

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    0.060    0.066      1.5      1.5      1.5     0.24 |
emr            |   0.068    0.066    0.076      1.7      1.7      1.7     0.27 |
esa            |   0.067    0.066    0.070      1.7      1.7      1.7     0.26 |
gfz            |   0.063    0.064    0.073      1.7      1.7      1.6     0.26 |
jpl            |   0.069    0.069    0.079      1.8      1.8      1.8     0.28 |
ngs            |   0.059    0.060    0.066      1.5      1.5      1.5     0.24 |
sio            |   0.058    0.059    0.065      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            |    -3.3     -0.4    -26.6 |     4.9      5.0      6.7 |
---------------|---------------------------|---------------------------|

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            |     ---        3.0     -28.6      -1.2      -1.0        .5 |
emr            |     ---       -6.6      -7.9      -5.1      -2.2       7.9 |
esa            |     ---       -3.2        .3      -3.0     -11.3        .7 |
gfz            |     ---        3.3       1.4      -1.2        .4      -3.4 |
jpl            |     ---      -10.6        .2      10.0       3.4      -4.0 |
ngs            |     ---       70.6      15.1     143.6      19.6      86.5 |
sio            |     ---       -1.9      -3.7        .0       -.5      -4.7 |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       -5.1       -.4       -.2      28.3      -1.3 |
---------------|------------------------------------------------------------|

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

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---        6.5       2.3       8.1       1.8       7.4 |
emr            |     ---       10.3       6.3      18.4       2.1      29.6 |
esa            |     ---       11.0       7.3      32.7       3.5      10.1 |
gfz            |     ---        7.3       1.7       4.1       3.0      10.0 |
jpl            |     ---        5.5       4.8      13.7       4.1      25.0 |
ngs            |     ---      128.4       8.9      75.1      10.3      60.4 |
sio            |     ---        9.2       2.8       8.9       2.4       2.9 |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       10.0       4.4       9.9       2.3       5.6 |
---------------|------------------------------------------------------------|

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

Thresholds set at 5 sigmas and 50 mm.

 Solution             Solution           |  Station   |    N       E       U  |
              Minus                      |code id soln|   (mm)    (mm)    (mm)|
-----------------------------------------|------------|-----------------------|
                                         |            |                       |
cod10847.snx         sio10847.snx        |GOPE  A ----|    6.5   -15.7    56.7|
                                         |            |                       |
esa10847.snx         ngs10847.snx        |OHIG  A ----|  -36.2     0.7   -68.3|
                                         |            |                       |
ngs10847.snx         sio10847.snx        |RIOG  A ----|   26.4    -0.9    50.3|
                                         |            |                       |
IGS00P41.snx         gfz10847.snx        |COCO  A ----|    8.7   -34.4    -4.0|
                                         |            |                       |
IGS00P41.snx         jpl10847.snx        |COCO  A ----|    7.6   -29.9     5.1|
IGS00P41.snx         jpl10847.snx        |SIO3  A ----|    3.0     2.7    93.1|
                                         |            |                       |
IGS00P41.snx         sio10847.snx        |COCO  A ----|    2.1   -34.2    11.5|
                                         |            |                       |
IGS00P41.snx         igs00P1084.snx      |COCO  A ----|    6.3   -38.1     5.8|
-----------------------------------------|------------|-----------------------|

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
    20703S001 RAMO A                                    ELRO A RAMO A RAMO A
                                                        RAMO A              
    31303M002 MAS1 A MAS1 A MASP A MAS1 A MAS1 A MAS1 A MAS1 A MAS1 A MAS1 A
    24901M002 BAHR A BAHR A BAHR A BAHR A BAHR A BAHR A        BAHR A BAHR A
    249010M02                                           BAHR A              
    13407S012 MADR A               MADR A        MADR A MAD2 A MADR A MADR A
    12353M001 YAKZ A                             YAKZ A YAKZ A YAKA A YAKA 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
                     NRC2 A                                                 
    42202M005 AREQ A AREQ A AREQ A AREQ A AREQ A AREQ B AREQ A AREQ A AREQ A
    50103M108 TIDB A TIDB A TID2 A TIDB A TIDB A TID2 A TID2 A TIDB A TIDB A
    50107M004 YAR1 A YAR1 A YAR1 A YAR1 A YAR1 A YAR1 A YAR1 A YAR1 A YAR1 A
                                          YAR2 A                            
    22306M002 IISC A IISC A IISC B        IISC A IISC B IISC A IISC A IISC A
    14208M001                      OBER A                      OBER A OBER A
    142080M01                                           OBER A              
 
MISSING IERS DOMES NOS AT gfz:
-----------------------------
  BISH A
 
MISSING IERS DOMES NOS AT sio:
-----------------------------
  GUAT A  CLGO A  NRIL A  RBAY A  NYA1 A

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

 _______________________ 
|Enforcing these aliases|
|_______________________|
   YAKA A: YAKZ A  
   GOLD A: GOL2 A  
   TIDB A: TID2 A  
   MAS1 A: MASP A  
   IISC A: IISC B  
   GALA A: GALA B  
   YAR1 A: YAR2 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 cod10847.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 jpl10847.snx (jpl).           
------- --------- -- ---- 
    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.)
=== ==== ==   ====   ====   ====   ====   ====   ====   ====   ====   ====
jpl NRIL  A  .0000  .0000  .0000  .0000  .0000  .0000  .0795  .0000  .0000
IGS NRIL  A  .1100  .0000  .0000  .1280  .0000  .0000  .0795  .0000  .0000

Antenna Conflicts in file sio10847.snx (sio).           
------- --------- -- ---- 
    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.)
=== ==== ==   ====   ====   ====   ====   ====   ====   ====   ====   ====
sio GOPE  A  .0780  .0000 -.0030  .0744 -.0031 -.0013  .0464  .0000  .0000
IGS GOPE  A  .1098  .0006  .0008  .1284  .0007  .0014  .0464  .0000  .0000

The following files have no antenna conflicts: 
   - emr10847.snx (emr)            
   - esa10847.snx (esa)            
   - gfz10847.snx (gfz)            
   - ngs10847.snx (ngs)            
--