Subject: [IGSREPORT-14688] Wk 1408 IGS SINEX Combination
From: "Martin Bourassa" <[email-masked]>
To: [email-masked]
Cc: [email-masked], [email-masked]
Date: Thu, 18 Jan 2007 01:07:42 -0500 (EST)

******************************************************************************
IGS Electronic Report   17 Jan 22:07:45 PST 2007      Message Number 14688
******************************************************************************

Author:  R. Ferland , M. Bourassa 

===================================================================
 Combined AC  solution for GPS week 1408 -  06/12/31 to 07/01/06
===================================================================

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)

igs07P1408.snx  Combined weekly solution. 
igs07P1408.erp  Daily Earth Rotation Parameters.
igs00p02.erp    Daily Earth Rotation Parameters since GPS week 1013.
IGS07P01.snx    Cumulative Combined solution. 
igs07P1408.sum  This file.
igs07P1408.itr  Residuals between the AC and the IGS05 for the RF stations. 
igs07P1408.res  Residuals between the AC and the Combined Weekly solution.
IGS07P01.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 = igs07P1408.snx
     IGS = IGS07P01.snx

     MIT = mit14087.snx
     mit = mit1408g.snx

     BuA = IERS Bulletin A

     jpl mit are used to quality control the weekly combination.
     gfz ngs excluded from the geocenter estimation (Sec. 5-4).

     Solutions with manual station deletion:
         From the original solution:
             cod  SATA  X  Y  Z
             emr  SATA  X  Y  Z
             gfz  SATA  X  Y  Z
             sio  SATA  X  Y  Z
         After unconstraining:
             jpl  ASPA  MCM4  OUS2  RBAY
             ngs  CNMR

     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.

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            | 162 | 101 |        25.677 |         1.001 |        25.709 |
emr            |  47 |  43 |         6.254 |         1.001 |         6.258 |
esa            |  66 |  57 |        16.537 |         1.001 |        16.547 |
gfz            | 177 | 105 |         5.161 |         1.002 |         5.169 |
MIT            | 150 |  94 |         2.685 |         1.001 |         2.689 |
ngs            | 194 | 111 |        30.384 |         1.002 |        30.431 |
sio            | 156 | 105 |         3.050 |         1.001 |         3.054 |
jpl            | 110 |  62 |         6.890 |         1.001 |         6.894 |
mit            | 291 | 117 |         0.988 |         1.001 |         0.989 |
igs            | 267 | 120 |         1.419 |         1.002 |         1.421 |
---------------|-----|-----|---------------|---------------|---------------|

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        101 |     0.3     -0.1      0.2 |     3.6      2.9      8.5 |
emr         43 |     1.0      0.2      0.5 |     3.6      2.7      9.9 |
esa         57 |    -1.6     -0.0     -0.1 |     4.2      3.1     11.6 |
gfz        105 |     0.9      0.0     -0.0 |     2.9      2.4      8.2 |
MIT         94 |    -0.4     -0.0     -0.1 |     3.1      2.3      7.4 |
ngs        111 |     0.9      0.0      0.2 |     3.0      3.0      8.8 |
sio        105 |     2.4     -0.2     -0.2 |     3.2      4.2      8.3 |
jpl         62 |     0.7     -0.1     -0.1 |     3.4      3.3     12.5 |
mit        117 |     0.7     -0.1      0.3 |     2.9      2.6      7.1 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        160 |     0.0     -0.1     -0.8 |     2.0      2.1      4.4 |
emr         46 |     0.6     -0.1      0.1 |     1.9      1.4      6.9 |
esa         65 |    -2.3      0.2     -0.3 |     2.3      2.1     11.2 |
gfz        174 |     0.3     -0.1      0.1 |     1.1      1.2      3.3 |
MIT        143 |    -1.1     -0.2     -0.4 |     1.2      1.2      3.2 |
ngs        186 |     0.4     -0.1      0.6 |     1.8      2.2      5.2 |
sio        150 |     1.7     -0.3     -0.4 |     1.7      3.8      3.8 |
jpl        103 |     0.2     -0.1     -0.8 |     1.8      2.5     11.8 |
mit        263 |     0.1     -0.2      0.1 |     0.7      0.8      1.6 |
ITR        119 |    -0.8      0.1     -0.4 |     2.6      2.1      7.0 |
---------------|---------------------------|---------------------------|

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

Solution       |  Weighted Average (mm)    |          STD (mm)         |
               |      N        E        U  |      N        E        U  |
---------------|---------------------------|---------------------------|
cod        145 |     0.5      0.1      0.4 |     2.8      3.1      6.8 |
emr         45 |     0.7     -0.0      0.7 |     3.0      2.7      9.5 |
esa         65 |    -1.8      0.1      1.1 |     3.1      2.8     12.9 |
gfz        157 |     0.7     -0.1      0.6 |     2.0      2.0      7.2 |
MIT        134 |    -0.6     -0.1      0.5 |     2.1      2.0      6.1 |
ngs        157 |     0.8     -0.0      1.2 |     2.6      3.3      9.2 |
sio        138 |     2.2     -0.6      0.5 |     2.4      4.0      7.8 |
jpl         92 |     0.4     -0.3      0.3 |     2.5      2.8     12.7 |
mit        213 |     0.5     -0.1      1.0 |     2.1      2.1      6.3 |
igs        213 |     0.5      0.1      0.9 |     1.8      1.8      6.4 |
ITR        129 |    -0.1      0.1     -0.1 |     1.7      1.3      5.0 |
---------------|---------------------------|---------------------------|

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            |  -0.004    0.001    0.001      0.1      0.3      0.6    -0.28 |
emr            |  -0.006    0.009    0.014      0.3      4.3     -8.5    -0.32 |
esa            |  -0.001   -0.012   -0.008      3.0      3.7      0.5    -1.06 |
gfz            |  -0.002   -0.020    0.011      0.5     -0.1      1.4    -0.78 |
MIT            |   0.002   -0.006    0.001     -0.5      1.5    -13.8     0.12 |
ngs            |   0.007   -0.039    0.007      3.8      0.8      5.6    -1.30 |
sio            |  -0.008   -0.047    0.006      3.0      2.6     30.6    -0.13 |
jpl            |   0.179   -0.091    0.328      5.7     10.0     14.3     0.36 |
mit            |  -0.000    0.001   -0.005      0.1      0.6     -0.3    -0.51 |
igs            |   0.000    0.000    0.000      0.0      0.0      0.0    -0.51 |
---------------|---------------------------------------------------------------|

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            |   0.039    0.042    0.043      1.1      1.0      1.0     0.16 |
emr            |   0.057    0.064    0.068      1.6      1.6      1.6     0.24 |
esa            |   0.050    0.054    0.057      1.3      1.3      1.3     0.21 |
gfz            |   0.039    0.040    0.043      1.0      1.0      1.0     0.16 |
MIT            |   0.041    0.043    0.045      1.1      1.1      1.1     0.17 |
ngs            |   0.038    0.040    0.042      1.0      1.0      1.0     0.16 |
sio            |   0.039    0.041    0.043      1.0      1.0      1.0     0.16 |
jpl            |   0.049    0.052    0.055      1.3      1.3      1.3     0.20 |
mit            |   0.037    0.038    0.041      1.0      1.0      1.0     0.15 |
igs            |   0.000    0.000    0.000      0.0      0.0      0.0     0.52 |
---------------|---------------------------------------------------------------|

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

               |      X        Y        Z  |    s X      s Y      s Z  |
               |    (mm)     (mm)     (mm) |    (mm)     (mm)     (mm) |
---------------|---------------------------|---------------------------|
igs            |     2.0      4.7     -4.2 |     3.3      3.4      5.3 |
---------------|---------------------------|---------------------------|

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            |     ---        ---       0.6       ---      -6.8       --- |
emr            |     ---       27.3      -2.9     -16.0      -3.8       0.5 |
esa            |     ---       -7.9       0.8       ---      -1.9       --- |
gfz            |     ---       -4.7      -1.1     -37.4       3.2     -15.4 |
MIT            |     ---        2.9       0.8       0.2      -3.6       0.3 |
ngs            |     ---      -12.2      -3.6      50.0       4.0      -0.6 |
sio            |     ---        2.8       1.3       0.7      -6.4      -0.3 |
jpl            |     ---       42.5       1.9     -34.8      -2.2      -8.4 |
mit            |     ---        2.8      -0.4       1.0      -3.0       0.3 |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---        0.5     -10.3      -0.1      32.3       0.2 |
---------------|------------------------------------------------------------|

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

Solution       |      UT       LOD       XPO      XPOR       YPO      YPOR  |
               |      us        us    .01mas    .01ma/d   .01mas    .01ma/d |
---------------|------------------------------------------------------------|
cod            |     ---        ---       1.5       ---       1.6       --- |
emr            |     ---       11.4       1.7      21.6       2.2      14.0 |
esa            |     ---       14.0       3.2       ---       3.7       --- |
gfz            |     ---        8.6       1.6      21.0       2.9       8.2 |
MIT            |     ---       10.1       3.4       5.9       1.3       6.0 |
ngs            |     ---       15.6       6.9      35.9       4.2      19.3 |
sio            |     ---        4.3       3.2       6.5       1.0       5.7 |
jpl            |     ---       40.2       3.0      38.4       2.9      11.6 |
mit            |     ---        9.0       3.3       5.5       2.2       6.9 |
ITR            |     ---        ---       ---       ---       ---       --- |
BuA            |     ---       18.2       7.2      11.0       2.3       7.1 |
---------------|------------------------------------------------------------|

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       cod14087.snx        |MKEA  A    1|    0.7    15.8     0.8|
ITRF_IGS05.snx       cod14087.snx        |YSSK  A    2|   -0.3   -19.0     4.0|
                                         |            |                       |
ITRF_IGS05.snx       gfz14087.snx        |YSSK  A    2|    1.6   -12.0    12.7|
                                         |            |                       |
ITRF_IGS05.snx       MIT14087.snx        |YSSK  A    2|    3.4   -13.7     5.9|
                                         |            |                       |
ITRF_IGS05.snx       mit1408g.snx        |GUAO  A    1|    1.6     1.6    71.3|
                                         |            |                       |
cod14087.snx         ngs14087.snx        |FAAA  A    1|    0.2   -34.5    21.5|
                                         |            |                       |
MIT14087.snx         jpl14087.snx        |SUNM  A    1|    1.4     2.5    55.7|
                                         |            |                       |
jpl14087.snx         mit1408g.snx        |SUNM  A    1|    0.9    -1.5   -52.6|
                                         |            |                       |
igs06P1407.snx       MIT14087.snx        |BAKO  A    7|    1.6    -1.8    48.2|
                                         |            |                       |
igs06P1407.snx       mit1408g.snx        |BAKO  A    7|    4.4    -2.4    49.2|
                                         |            |                       |
IGS06P52.snx         gfz14087.snx        |BAKO  A    7|   -1.8    -2.2    50.0|
                                         |            |                       |
IGS06P52.snx         mit1408g.snx        |FAAA  A    1|    7.8   -28.8    53.2|
                                         |            |                       |
IGS06P52.snx         igs07P1408.snx      |MKEA  A    1|   -2.5     8.2     5.4|
IGS06P52.snx         igs07P1408.snx      |RESO  A    1|   -5.0    -9.0    -4.8|
-----------------------------------------|------------|-----------------------|

5-8)      Conflicts:
====================

IERS DOMES NO    MIT    cod    emr    esa    gfz    jpl    ngs    sio    IGS    igs
============= ====== ====== ====== ====== ====== ====== ====== ====== ====== ======
    43001M002        THU2 A THU3 A THU3 A THU3 A THU2 A THU3 A THU2 A THU3 A THU3 A
                     THU3 A                      THU3 A
    42202M005 AREQ A AREQ A AREQ A AREQ A AREQ A AREQ A AREQ B AREQ A AREQ A AREQ A
    40451M123 GODE A GODZ A        GODE A GODE A        GODE A GODE A GODE A GODE A
    40405S031 GOL2 A GOLD A        GOLD A GOLD A        GOLD A GOL2 A GOLD A GOLD A
    50103M108 TIDB A        TIDB A TIDB A TIDB A TID1 A TIDB A TID2 A TIDB A TIDB A
                                          TID1 A               TIDB A
                                          TID2 A 
    22003M001 PIMO A PIMO A PIMO A PIMO B PIMO A PIMO A PIMO A PIMO A PIMO A PIMO A
    50107M004 YAR2 A YAR2 A               YAR2 A               YAR2 A YAR1 A YAR1 A
    22306M002 IISC A IISC A        IISC B IISC A IISC A IISC B IISC A IISC A IISC A
    20703S001 RAMO A RAMO A ELRO A        RAMO A RAMO A RAMO A        ELRO A RAMO A
                                                                      RAMO A 
    30314M002 SUTH A SUTH A SUTH A SUTH B SUTH A        SUTH A SUTH A SUTH A SUTH A
    43401M001        BDOS A               BDOS A        BDOS A        BDOS A BDOS A
                                                                      BDOS A BDOS A
    43005M002        KELY B        KELY B KELY B        KELY B KELY A KELY A KELY A
    10422M001        KIR0 A                      KIR0 A KIR0 A        KR0G A KR0G A
 
MISSING IERS DOMES NOS AT MIT:
-----------------------------
  HLFX A  PALM A  PUR3 A  MIA3 A  CCV3 A  KYW1 A  MCD1 A  ELEN A  ENG1 A  UPO1 A
  MTJO A  QUAR A  ELAT A  MAR6 A
 
MISSING IERS DOMES NOS AT gfz:
-----------------------------
  PALM A
 
MISSING IERS DOMES NOS AT ngs:
-----------------------------
  AZCO A  LEBA A  MCN1 A  NISU A  SUTB A  MLF1 A
 
MISSING IERS DOMES NOS AT sio:
-----------------------------
  KULU A  SG21 A  CNCL A  KARA A
IERS DOMES NO    mit    IGS    igs
============= ====== ====== ======
    13407S012 MAD2 A MAD2 A MADR A
              MADR A MADR A 
    43401M001 BDOS A BDOS A BDOS A
                     BDOS A BDOS A
    43001M002 THU2 A THU3 A THU3 A
    40451M123 GODZ A GODE A GODE A
              GODE A
    50107M004 YAR2 A YAR1 A YAR1 A
    12330M003 ZWE2 A        ZWE2 A
 
MISSING IERS DOMES NOS AT mit:
-----------------------------
  KULU A  PALM A  PUR3 A  MIA3 A  CCV3 A  KYW1 A  MCD1 A  MCN1 A  LEBA A  MLF1 A
  ENG1 A  SG21 A  SUTB A  AIS1 A  KOD1 A  UPO1 A  MTJO A  CNCL A  QUAR A  KARA A
  MAR6 A