Subject: [IGSREPORT-2120] Wk 822 MIT T2 Analysis Report
From: Thomas Herring
Date: Tue, 31 Oct 1995 7:58:13 PST

******************************************************************************
IGS Electronic Report    Tue Oct 31  7:58:13 PST 1995      Message Number 2120
******************************************************************************

Author: Thomas Herring
Subject: Wk 822 MIT T2 Analysis Report

********************************************************************************
MIT ANALYSIS REPORT GPS-WEEK 0822    Dates: 95oct08  to  95oct14                
********************************************************************************

MIT (Massachusetts Institute of Technology)
Room 54-618
77 Massachusetts Avenue, 
Cambridge,  MA  02139
e-mail: [email-masked] 
tel:    (617)253-5941 (Tom Herring)
fax:    (617)253-1699

PRODUCTS GENERATED:
The following products are generated and uploaded into CDDIS @ NASA/GSFC
   MIT0822T.SNX   Combined sinex file from all available analysis centers
   MIT0822T.SUM   Name of this summary file
   
1.0 Analysis Procedures:

(1) Each centers sinex solutions are de-constrained before
 combination.  Due to numerical stability different new constraints
 are applied to different centers (see center report below):
 
(2) Covariance matrices from each center are re-scaled to generate
 unit increment in chi square per degree in the tight constraints.
 The values are are based in the chi**2 per degree of freedom increment
 when the loosely constrained solution is constrained to the ITRF1993
 coordinates of the 13 core sites. Orientation changes are estimated but
 translations and scale are NOT estimated.
 
(3) The tight solution is generated with the following constraints on
 the core sites
           Sig N Sig E Sig U
           (m)    (m)   (m)
     TROM  0.004 0.004 0.004 
     MADR  0.003 0.003 0.003 
     KOSG  0.003 0.003 0.005 
     WETT  0.002 0.002 0.003 
     HART  0.004 0.004 0.004 
     ALGO  0.003 0.003 0.003 
     YELL  0.003 0.003 0.004  
     GOLD  0.004 0.004 0.005 
     FAIR  0.003 0.003 0.003 
     KOKB  0.003 0.003 0.003  
     SANT  0.004 0.004 0.004  
     TIDB  0.004 0.004 0.004 
     YAR1  0.004 0.004 0.005  

Earth rotation parameters are estimated for center (even when not given
in the original SINEX files.  In this case the partial derivatives are
computed from the station coordinates).

(4) Individual Center comments:
EMR: (a) Constraints loosened to +-5 m for positions
JPL: (a) Constraints not changed.  No constraints given SINEX file but
     appear to be about 1 meter of the core sites.
GFZ: (a) Constraints loosened to +-5 m for positions.
COD: (a) Constraints loosened to +-0.5 m for positions: Looser constraints
     generate non-positive definite covariance matrices.
SIO: (a) Constraints not changed since the center's constraints are 
     extremely weak.
     (b) Some site names changed to bring into accord with IGS naming conventions
     (c) For this week we remade the SIO sinex file from the GAMIT hfiles
     with out translation parameters estimated.
NGS: (a) Constraints loosened to +-0.1 m for positions: Looser constraints
     generate non-positive definite covariance matrices.
     (b) Earth rotation parameters have the wrong units and we preprocess these
     files to remove the EOP parameters.
     (c) The following ties are 'removed'            
     TSKB_GPS  -26.306   -38.284     2.761 XYZ
     AREQ_GPS   18.615    -0.548    21.499 XYZ 
     MAS1_GPS    3.120    -0.845    -9.563 XYZ
     The values here are not the same as those in the SINEX file which
     appear to be incorrect
     (d) SINEX files are manually edited to put correct day number in them
     and then combined into a loose 1-week solution to make them
     compatible with the other centers.

NOTES:  NGS is the only center applying phase center corrections and for
reasons that are not clear, applying these models yeilds worse aggreement
with ITRF-1993 than not using the models.  The ~10 cm height changes 
caused by applying these models has been seen in our (MIT) analyses as
well.  For this reason, NGS's analysis gets a large variance scaling factor.

 
 2.0 COMBINED FIT TO ITRF 1993
Transformation of loose solution COMBINED to ITRF93
-----------------------------------------------
   X-tran  +-      Y-tran  +-      Z-tran   +-   Scale   +-
   (mm)   (mm)     (mm)   (mm)      (mm)   (mm)  (ppb)  (ppb)
   19.9    2.2     37.4    2.1     -1.5    2.3  -0.605  0.707  COMBINED
 
 Adjustments to core site positions for COMBINED
 SITE    dNorth  +-     dEast   +-    dUp    +- 
          (mm)  (mm)    (mm)   (mm)   (mm)  (mm)
 MADR    -6.6    0.7    6.3    1.1    4.8    3.3  COMBINED
 SANT   -15.6    1.8    0.6    2.2   17.9    4.4  COMBINED
 ALGO     1.0    0.8    2.8    1.0  -28.3    2.5  COMBINED
 YELL     3.1    0.8   -0.4    0.7   24.9    3.1  COMBINED
 GOLD     2.9    0.8   -3.2    1.0  -17.2    3.3  COMBINED
 FAIR     3.6    0.8   -1.3    1.0   -6.1    3.8  COMBINED
 KOKB     1.6    1.1   -9.0    2.0   -4.8    5.0  COMBINED
 TIDB    -7.5    1.1   12.4    1.6  -14.6    3.9  COMBINED
 YAR1     5.6    1.1    8.5    1.6  -10.3    4.2  COMBINED
 HART     9.9    1.6  -12.6    2.9   19.7    6.9  COMBINED
 TROM    12.0    0.9   -9.4    0.9    4.2    3.9  COMBINED
 WETT    -5.7    0.7    6.6    0.9    2.9    3.2  COMBINED
 KOSG     5.2    0.7   -4.6    0.9    6.8    3.5  COMBINED

 3.0 CENTER FITS TO ITRF 1993
 CENTER EMR
 -------------------
 VARIANCE RESCALING FACTOR FOR EMR 51.481
 
Transformation of loose solution EMR to ITRF93
-----------------------------------------------
   X-tran  +-      Y-tran  +-      Z-tran   +-   Scale   +-
   (mm)   (mm)     (mm)   (mm)      (mm)   (mm)  (ppb)  (ppb)
   13.2    3.7    155.0    3.6    -38.6    3.8   0.370  1.194  EMR
 
 Adjustments to core site positions for EMR
 SITE    dNorth  +-     dEast   +-    dUp    +- 
          (mm)  (mm)    (mm)   (mm)   (mm)  (mm)
 MADR    -4.9    4.9   12.1    8.4   -6.6   18.7  EMR
 SANT   -30.0   11.8   21.2   15.2   -2.9   25.4  EMR
 ALGO     0.5    5.4   -5.1    8.8  -20.0   15.0  EMR
 YELL     4.2    5.4    0.8    7.8   27.6   17.0  EMR
 GOLD     7.5    5.0   -5.5    8.6   -1.7   20.3  EMR
 FAIR     7.5    5.9  -10.4    9.0  -12.8   19.4  EMR
 KOKB     5.6    7.6   -3.3   13.5    3.4   31.6  EMR
 TIDB    -7.9    7.0    8.4   10.7   13.0   23.4  EMR
 YAR1     9.3    6.7   16.7   10.7   -5.8   23.3  EMR
 HART     0.7    9.7  -33.2   15.9  -30.2   35.8  EMR
 TROM    14.3    6.3  -18.6    8.9   10.7   22.2  EMR
 WETT    -5.3    4.9   10.1    7.6    8.4   17.5  EMR
 KOSG     5.6    5.0   -5.7    8.3   16.8   19.3  EMR
 
 CENTER JPL
 -------------------
 VARIANCE RESCALING FACTOR FOR JPL 12.0701
 
Transformation of loose solution JPL to ITRF93
-----------------------------------------------
   X-tran  +-      Y-tran  +-      Z-tran   +-   Scale   +-
   (mm)   (mm)     (mm)   (mm)      (mm)   (mm)  (ppb)  (ppb)
   16.2    2.9      7.0    2.8     -8.5    3.0  -0.907  0.936  JPL
 
 Adjustments to core site positions for JPL
 SITE    dNorth  +-     dEast   +-    dUp    +- 
          (mm)  (mm)    (mm)   (mm)   (mm)  (mm)
 MADR   -10.2    1.5    5.4    3.0  -11.0    6.3  JPL
 SANT   -11.2    3.2    3.1    4.0   19.6    7.5  JPL
 ALGO     7.9    1.8    2.3    3.0  -26.2    5.7  JPL
 YELL     7.2    1.9    2.3    2.8   21.7    6.6  JPL
 GOLD     5.1    1.6  -12.5    3.0  -10.9    7.2  JPL
 FAIR     3.7    1.9   -7.9    2.9   -9.7    7.3  JPL
 KOKB    -4.9    2.0   -0.4    3.8  -14.9    8.7  JPL
 TIDB    -6.4    2.1   12.1    3.0  -17.6    6.8  JPL
 YAR1     8.0    2.2   11.1    3.4   -4.0    7.4  JPL
 HART    10.8    2.9   -7.8    5.3   47.8   11.4  JPL
 TROM    13.4    2.1  -18.5    3.1    0.7    8.6  JPL
 WETT    -6.9    1.5    3.2    2.6    1.1    6.2  JPL
 KOSG     2.7    1.8   -6.1    3.1    3.4    7.8  JPL
 
 CENTER GFZ
 -------------------
 VARIANCE RESCALING FACTOR FOR GFZ 57.738
 
Transformation of loose solution GFZ to ITRF93
-----------------------------------------------
   X-tran  +-      Y-tran  +-      Z-tran   +-   Scale   +-
   (mm)   (mm)     (mm)   (mm)      (mm)   (mm)  (ppb)  (ppb)
  116.2    3.8     53.0    3.6    -47.5    3.9  -0.037  1.204  GFZ
 
 Adjustments to core site positions for GFZ
 SITE    dNorth  +-     dEast   +-    dUp    +- 
          (mm)  (mm)    (mm)   (mm)   (mm)  (mm)
 MADR    -1.3    3.7   12.9    7.5   13.2   19.7  GFZ
 SANT   -32.3    7.8   -3.6   10.0   24.5   22.5  GFZ
 ALGO    -3.2    4.0    0.8    7.1  -38.5   17.3  GFZ
 YELL     3.3    4.2    9.4    6.1   32.9   19.3  GFZ
 GOLD     1.0    4.0   -5.6    7.0  -22.1   19.7  GFZ
 FAIR     7.8    4.2    1.5    6.1    1.1   18.8  GFZ
 KOKB    -0.8    4.7   -5.6    9.5  -26.6   24.0  GFZ
 TIDB    -4.3    5.4   12.5    7.9    5.6   21.6  GFZ
 YAR1     8.5    5.5   13.8    8.0  -23.0   23.0  GFZ
 HART    13.6    7.2  -39.6   13.7   -1.3   37.0  GFZ
 TROM    11.6    4.3   -6.3    6.6   12.6   22.8  GFZ
 WETT    -3.7    3.6   15.3    6.8   16.0   18.7  GFZ
 KOSG     9.3    3.9    4.8    7.3    5.8   21.6  GFZ
 
 CENTER COD
 -------------------
 VARIANCE RESCALING FACTOR FOR COD 10.6443
 
Transformation of loose solution COD to ITRF93
-----------------------------------------------
   X-tran  +-      Y-tran  +-      Z-tran   +-   Scale   +-
   (mm)   (mm)     (mm)   (mm)      (mm)   (mm)  (ppb)  (ppb)
   14.2    2.7     11.5    2.6      2.5    2.8  -0.738  0.858  COD
 
 Adjustments to core site positions for COD
 SITE    dNorth  +-     dEast   +-    dUp    +- 
          (mm)  (mm)    (mm)   (mm)   (mm)  (mm)
 MADR    -8.4    1.2    3.6    1.6   15.3    4.8  COD
 SANT    -7.2    3.2    3.6    3.9   27.5    7.2  COD
 ALGO    -1.1    1.1    4.2    1.4  -27.2    4.3  COD
 YELL     1.1    1.1   -0.8    1.0   23.3    4.6  COD
 GOLD    -1.1    1.2   -1.1    1.5  -23.6    5.2  COD
 FAIR     1.6    1.2   -1.8    1.4   -4.5    5.6  COD
 KOKB     4.6    2.0  -22.5    3.5   21.9    9.5  COD
 TIDB    -9.7    1.8   14.1    2.5  -23.5    6.5  COD
 YAR1     3.0    1.8    8.9    2.7  -25.1    6.8  COD
 HART    11.7    2.7   -0.9    4.6    6.2   11.8  COD
 TROM    10.6    1.3   -9.2    1.2    4.2    5.7  COD
 WETT    -7.5    1.1    4.2    1.5    1.4    4.9  COD
 KOSG     3.3    1.0   -6.4    1.3    4.1    5.0  COD
 
 CENTER SIO
 -------------------
 VARIANCE RESCALING FACTOR FOR SIO 5.16982
 
Transformation of loose solution SIO to ITRF93
-----------------------------------------------
   X-tran  +-      Y-tran  +-      Z-tran   +-   Scale   +-
   (mm)   (mm)     (mm)   (mm)      (mm)   (mm)  (ppb)  (ppb)
   20.5    2.7    151.0    2.6    -61.5    2.8  -0.067  0.873  SIO
 
 Adjustments to core site positions for SIO
 SITE    dNorth  +-     dEast   +-    dUp    +- 
          (mm)  (mm)    (mm)   (mm)   (mm)  (mm)
 MADR    -2.8    2.4    8.5    4.5    7.2   11.8  SIO
 SANT   -35.8    5.1   -0.7    7.0   -2.5   16.3  SIO
 ALGO     5.1    2.4    5.2    3.6  -25.2    5.8  SIO
 YELL     2.8    2.4    4.2    3.4   30.7    9.0  SIO
 GOLD    10.2    2.4   -7.6    3.4  -14.2    7.5  SIO
 FAIR     4.2    2.6   -0.5    3.8   -8.5   12.4  SIO
 KOKB     2.5    3.5   -6.0    4.9   -5.8   10.8  SIO
 TIDB   -13.8    3.5   21.0    5.1   -2.6   14.4  SIO
 YAR1     5.9    3.7    5.2    5.2   -3.4   14.9  SIO
 HART    11.6    4.8  -24.0    8.3   -5.2   21.1  SIO
 TROM    12.2    2.7  -16.9    3.4    9.5   11.8  SIO
 WETT    -4.1    2.2   12.9    3.5    5.3    9.1  SIO
 KOSG     8.1    2.9   -3.5    5.4   14.9   15.9  SIO
 
 CENTER NGS
 -------------------
 VARIANCE RESCALING FACTOR FOR NGS 510.595
 
Transformation of loose solution NGS to ITRF93
-----------------------------------------------
   X-tran  +-      Y-tran  +-      Z-tran   +-   Scale   +-
   (mm)   (mm)     (mm)   (mm)      (mm)   (mm)  (ppb)  (ppb)
   11.8    4.1    208.1    4.0    143.9    4.2   6.438  1.309  NGS
 
 Adjustments to core site positions for NGS
 SITE    dNorth  +-     dEast   +-    dUp    +- 
          (mm)  (mm)    (mm)   (mm)   (mm)  (mm)
 MADR     5.9    7.4    1.1   13.4   -5.2   21.9  NGS
 SANT   -69.5   27.5   57.5   29.7  -46.3   26.4  NGS
 ALGO     3.3    7.7    9.3   10.4  -26.7   11.1  NGS
 YELL    15.2    8.3   -1.9    9.7   23.0   13.5  NGS
 GOLD    10.3    6.7   -6.9    9.3  -29.1   16.9  NGS
 FAIR    17.3    9.4  -15.1   11.8  -10.1   18.4  NGS
 KOKB    14.3   11.1  -13.0   21.3  -39.0   29.4  NGS
 TIDB    -2.5   11.4   22.4   19.7   55.4   26.7  NGS
 YAR1    12.7    8.9   34.8   16.5   28.5   26.6  NGS
 HART   -20.2   15.8  -78.5   27.7   -3.4   45.4  NGS
 TROM    22.9    9.0  -22.3    9.9   12.2   18.5  NGS
 WETT    11.1    7.0    7.2   11.3   20.9   20.3  NGS
 KOSG    19.3    6.3   -8.8   10.1   20.4   18.8  NGS

[Mailed From: Tom Herring <[email-masked]>]