Subject: [IGSREPORT-2146] Wk 0824 MIT T2 Analysis Report
From: Thomas Herring
Date: Thu, 9 Nov 1995 11:45:42 PST

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IGS Electronic Report    Thu Nov  9 11:45:42 PST 1995      Message Number 2146
******************************************************************************

Author: Thomas Herring
Subject: Wk 0824 MIT T2 Analysis Report

********************************************************************************
MIT ANALYSIS REPORT GPS-WEEK 0824    Dates: 95oct22  to  95oct28                
********************************************************************************

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
   MIT0824T.SNX   Combined sinex file from all available analysis centers
   MIT0824T.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
 in this step, 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
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
     
(5) When the combined and center solutions are compared to ITRF93, the
heights are given a variance 10 times larger than the horizontal coordinates.
The same variance ratio is used when the RMS to ITRF93 core sites is
computed.

(6) Starting Week 0823, we show the differences in the coordinates for
four non-core sites, in remote areas, that are processed by all centers.
These sites are not used in the RMS calculations or the transformation
estimation to the 13 core sites.

 2.0 COMBINED FIT TO ITRF 1993
 Transformation of loose solution COMBINED to ITRF93
 -----------------------------------------------
 For   13 Sites, RMS after 7 parameter transformation   5.5 mm  COMBINED
   X-tran  +-      Y-tran  +-      Z-tran   +-   Scale   +-
   (mm)   (mm)     (mm)   (mm)      (mm)   (mm)  (ppb)  (ppb)
   19.0    2.4     34.0    2.3      1.3    2.5  -0.525  0.767  COMBINED
 
 Adjustments to core site positions for COMBINED
 SITE    dNorth  +-     dEast   +-    dUp    +- 
          (mm)  (mm)    (mm)   (mm)   (mm)  (mm)
 MADR   -10.2    0.8    6.7    1.0    5.1    3.5  COMBINED
 SANT   -12.4    1.7    2.0    2.2    7.1    4.3  COMBINED
 ALGO     2.2    0.8    1.4    1.0  -24.0    2.6  COMBINED
 YELL     2.5    0.7    0.9    0.7   22.4    3.2  COMBINED
 GOLD     1.4    0.8   -8.3    1.1  -14.5    4.0  COMBINED
 FAIR     4.1    0.9   -2.0    1.0    3.3    4.4  COMBINED
 KOKB    -3.5    1.1   -3.6    1.9   -6.2    4.6  COMBINED
 TIDB    -2.9    1.1   14.6    1.6  -10.6    4.0  COMBINED
 YAR1     8.9    1.1    5.7    1.6  -13.4    4.2  COMBINED
 HART    11.7    1.5  -15.9    2.6   21.7    5.7  COMBINED
 TROM    16.5    0.9   -4.6    0.8   -1.0    3.9  COMBINED
 WETT   -10.4    0.7    7.5    0.9    4.5    3.3  COMBINED
 KOSG     0.5    0.7   -4.9    0.8    5.5    3.1  COMBINED
 Additional Sites 
 FORT    -2.8    1.5   10.9    2.7  -23.3    5.8  COMBINED
 MCM4    -2.7    1.9   -0.8    2.1   -2.8    6.3  COMBINED
 GUAM    -2.8    1.5   -3.4    3.1   -2.9    4.8  COMBINED
 KIT3    -6.3    1.3   -5.5    2.2   -5.1    3.6  COMBINED

 3.0 CENTER FITS TO ITRF 1993
 CENTER EMR
 -------------------
 VARIANCE RESCALING FACTOR FOR EMR 53.2303
 
 Transformation of loose solution EMR to ITRF93
 -----------------------------------------------
 For   13 Sites, RMS after 7 parameter transformation   7.9 mm  EMR
   X-tran  +-      Y-tran  +-      Z-tran   +-   Scale   +-
   (mm)   (mm)     (mm)   (mm)      (mm)   (mm)  (ppb)  (ppb)
   17.1    3.5    163.2    3.4     19.2    3.6   0.175  1.111  EMR
 
 Adjustments to core site positions for EMR
 SITE    dNorth  +-     dEast   +-    dUp    +- 
          (mm)  (mm)    (mm)   (mm)   (mm)  (mm)
 MADR    -7.1    4.9    5.4    8.9  -13.6   20.4  EMR
 SANT   -23.6   11.1   17.9   15.0   -6.5   25.5  EMR
 ALGO     0.6    5.6   -1.2    8.9  -17.7   15.8  EMR
 YELL     4.4    5.3    6.4    7.8   19.4   17.6  EMR
 GOLD     8.1    5.2  -10.1   10.2   -9.4   23.7  EMR
 FAIR     9.9    6.4   -4.2   10.7  -14.7   25.0  EMR
 KOKB     1.1    7.2   -7.2   12.8   -5.4   30.0  EMR
 TIDB    -5.2    6.8   10.7   11.1   30.8   24.3  EMR
 YAR1     8.3    6.5   17.9   10.5   -8.7   23.5  EMR
 HART     7.3    9.2  -29.6   15.0    3.3   31.3  EMR
 TROM    23.5    6.5   -7.7    9.1    2.9   23.4  EMR
 WETT    -8.4    5.0    6.6    8.3    3.5   19.1  EMR
 KOSG     2.2    4.6   -6.3    7.5   16.4   17.5  EMR
 Additional Sites 
 FORT    -4.4    9.7    9.1   17.6  -33.6   40.3  EMR
 MCM4    -2.4   10.7   -9.8   13.3    9.1   34.4  EMR
 GUAM    -5.1   10.2  -12.3   19.8   19.9   28.7  EMR
 KIT3    -8.6    8.8    1.5   15.6   -3.1   23.9  EMR
 
 CENTER JPL
 -------------------
 VARIANCE RESCALING FACTOR FOR JPL 12.3195
 
 Transformation of loose solution JPL to ITRF93
 -----------------------------------------------
 For   13 Sites, RMS after 7 parameter transformation   7.0 mm  JPL
   X-tran  +-      Y-tran  +-      Z-tran   +-   Scale   +-
   (mm)   (mm)     (mm)   (mm)      (mm)   (mm)  (ppb)  (ppb)
    5.2    3.1      3.3    2.9      6.7    3.1  -0.629  0.975  JPL
 
 Adjustments to core site positions for JPL
 SITE    dNorth  +-     dEast   +-    dUp    +- 
          (mm)  (mm)    (mm)   (mm)   (mm)  (mm)
 MADR   -12.4    1.5    7.3    2.8   -6.1    6.3  JPL
 SANT    -9.7    2.9    5.7    4.0   22.2    7.5  JPL
 ALGO     4.2    1.7    3.4    2.9  -27.4    5.6  JPL
 YELL     6.5    1.6    2.2    2.4   15.0    6.2  JPL
 GOLD     1.0    1.6  -12.1    3.4  -13.1    8.0  JPL
 FAIR     4.3    1.8   -6.5    2.7    2.6    7.2  JPL
 KOKB    -7.5    1.9   -1.9    3.5   -7.6    7.6  JPL
 TIDB    -0.9    2.0   11.0    3.0  -13.8    6.6  JPL
 YAR1    11.9    1.9   13.3    3.2  -14.6    7.1  JPL
 HART    12.1    2.6  -18.3    4.6   37.2    9.0  JPL
 TROM    18.8    1.9   -7.3    2.7   -4.2    7.6  JPL
 WETT   -10.6    1.6    4.4    2.6    3.4    6.4  JPL
 KOSG    -0.2    1.4   -6.2    2.4    6.4    5.9  JPL
 Additional Sites 
 FORT    -6.0    2.7    8.1    5.0    9.4   11.2  JPL
 MCM4    -4.3    3.6   -3.1    4.5  -23.2   11.7  JPL
 GUAM    -8.2    2.6    4.5    5.4  -15.0    7.6  JPL
 KIT3    -0.2    2.5   -0.1    4.3   -7.6    6.5  JPL
 
 CENTER GFZ
 -------------------
 VARIANCE RESCALING FACTOR FOR GFZ 57.2625
 
 Transformation of loose solution GFZ to ITRF93
 -----------------------------------------------
 For   13 Sites, RMS after 7 parameter transformation   8.6 mm  GFZ
   X-tran  +-      Y-tran  +-      Z-tran   +-   Scale   +-
   (mm)   (mm)     (mm)   (mm)      (mm)   (mm)  (ppb)  (ppb)
  106.3    3.8     46.1    3.6     -0.6    3.9   0.021  1.203  GFZ
 
 Adjustments to core site positions for GFZ
 SITE    dNorth  +-     dEast   +-    dUp    +- 
          (mm)  (mm)    (mm)   (mm)   (mm)  (mm)
 MADR    -8.4    3.6    8.5    7.0   12.0   19.3  GFZ
 SANT   -21.3    7.0    6.1    9.0   23.6   21.1  GFZ
 ALGO    -2.1    3.7    7.5    6.8  -35.1   17.0  GFZ
 YELL     4.8    3.7    5.8    5.5   25.2   18.1  GFZ
 GOLD    -0.2    4.0   -7.4    7.6  -12.9   21.9  GFZ
 FAIR     5.9    4.1   -4.5    6.2    1.0   20.7  GFZ
 KOKB    -5.1    4.5  -12.2    8.4  -19.5   22.9  GFZ
 TIDB    -2.6    4.9    8.8    7.7   10.3   21.9  GFZ
 YAR1    14.7    4.7   25.3    7.3  -36.4   21.9  GFZ
 HART    15.2    6.2  -38.2   11.3   21.4   30.2  GFZ
 TROM    20.1    4.2   -3.4    6.0    1.2   22.2  GFZ
 WETT    -8.4    3.5   10.8    6.4    7.9   18.1  GFZ
 KOSG     2.6    3.3   -1.6    5.9    1.6   17.7  GFZ
 Additional Sites 
 FORT   -18.8    5.7   -2.3   10.7  -24.4   26.0  GFZ
 MCM4    -9.5    6.7   -9.1    8.4   11.5   29.3  GFZ
 GUAM    -3.8    6.2   -4.0   13.4   14.0   23.9  GFZ
 KIT3    -1.3    5.9   -5.3    9.4   11.5   19.4  GFZ
 
 CENTER COD
 -------------------
 VARIANCE RESCALING FACTOR FOR COD 18.8744
 
 Transformation of loose solution COD to ITRF93
 -----------------------------------------------
 For   13 Sites, RMS after 7 parameter transformation   6.0 mm  COD
   X-tran  +-      Y-tran  +-      Z-tran   +-   Scale   +-
   (mm)   (mm)     (mm)   (mm)      (mm)   (mm)  (ppb)  (ppb)
    9.3    2.6      7.8    2.5      9.2    2.7  -1.461  0.839  COD
 
 Adjustments to core site positions for COD
 SITE    dNorth  +-     dEast   +-    dUp    +- 
          (mm)  (mm)    (mm)   (mm)   (mm)  (mm)
 MADR   -12.3    1.2    3.7    1.5   19.0    5.4  COD
 SANT    -8.6    2.9    4.7    3.6    4.5    7.0  COD
 ALGO     2.3    1.2   -1.1    1.5  -19.8    4.8  COD
 YELL     1.4    1.0   -0.8    1.0   26.0    4.9  COD
 GOLD     1.5    1.3  -10.1    1.5  -15.8    6.5  COD
 FAIR     3.1    1.3   -2.9    1.4    9.2    7.0  COD
 KOKB    -1.7    1.9   -6.0    3.0    7.3    8.3  COD
 TIDB    -5.4    1.8   17.8    2.4  -14.3    6.9  COD
 YAR1     4.2    1.8    0.1    2.5  -15.5    6.9  COD
 HART    12.4    2.6   -2.2    4.3  -13.4   10.6  COD
 TROM    13.3    1.3   -5.8    1.1    3.7    6.0  COD
 WETT   -12.6    1.1    4.7    1.4    6.7    5.3  COD
 KOSG    -1.8    1.0   -7.0    1.2    2.3    4.8  COD
 Additional Sites 
 FORT     1.7    2.4   14.8    4.7  -49.0    9.8  COD
 MCM4    -5.1    3.4    4.2    3.2    5.4   10.1  COD
 GUAM    -0.4    2.6   -8.6    5.2    9.5    8.6  COD
 KIT3   -10.1    2.1  -10.5    3.5  -12.7    5.9  COD
 
 CENTER SIO
 -------------------
 VARIANCE RESCALING FACTOR FOR SIO 6.54066
 
 Transformation of loose solution SIO to ITRF93
 -----------------------------------------------
 For   13 Sites, RMS after 7 parameter transformation   6.3 mm  SIO
   X-tran  +-      Y-tran  +-      Z-tran   +-   Scale   +-
   (mm)   (mm)     (mm)   (mm)      (mm)   (mm)  (ppb)  (ppb)
   35.9    2.7    151.2    2.7    -82.7    2.8   1.118  0.877  SIO
 
 Adjustments to core site positions for SIO
 SITE    dNorth  +-     dEast   +-    dUp    +- 
          (mm)  (mm)    (mm)   (mm)   (mm)  (mm)
 MADR    -7.2    2.5    4.1    5.0    2.9   14.2  SIO
 SANT   -26.9    4.9   -3.6    6.6  -19.7   16.4  SIO
 ALGO     7.0    2.4    8.6    3.7  -18.3    6.0  SIO
 YELL     3.9    2.4    5.2    3.4   28.7    9.6  SIO
 GOLD     9.3    2.4   -7.0    3.5  -11.0    9.1  SIO
 FAIR     4.0    3.0   -1.7    4.8   -6.3   16.7  SIO
 KOKB    -2.0    3.5   -3.1    5.0  -12.9   11.8  SIO
 TIDB    -9.8    3.4   16.0    5.3    7.6   15.6  SIO
 YAR1     5.9    3.5    9.5    5.2    1.2   15.8  SIO
 HART    16.8    4.5  -21.3    7.7   29.1   18.9  SIO
 TROM    22.1    2.8   -7.0    3.4   -6.5   12.1  SIO
 WETT    -8.2    2.3    7.1    3.5    3.5   10.5  SIO
 KOSG     1.7    2.3   -5.9    4.2    1.9   13.0  SIO
 Additional Sites 
 FORT     3.5    5.3   18.9    7.0  -16.8   12.9  SIO
 MCM4     2.0    5.4  -11.2    6.2   21.1   17.3  SIO
 GUAM    -8.4    4.7   -7.5    9.3   -3.3   12.9  SIO
 KIT3    -3.8    4.1    1.0    6.0   -5.0    8.0  SIO
 
 CENTER NGS
 -------------------
 VARIANCE RESCALING FACTOR FOR NGS 611.242
 
 Transformation of loose solution NGS to ITRF93
 -----------------------------------------------
 For   13 Sites, RMS after 7 parameter transformation   8.6 mm  NGS
   X-tran  +-      Y-tran  +-      Z-tran   +-   Scale   +-
   (mm)   (mm)     (mm)   (mm)      (mm)   (mm)  (ppb)  (ppb)
   11.2    3.8    213.1    3.6    190.3    3.9   6.334  1.201  NGS
 
 Adjustments to core site positions for NGS
 SITE    dNorth  +-     dEast   +-    dUp    +- 
          (mm)  (mm)    (mm)   (mm)   (mm)  (mm)
 MADR     9.6    6.3    1.6   10.1   33.4   17.7  NGS
 SANT   -77.7   24.9   57.1   27.2  -54.6   24.6  NGS
 ALGO     1.1    6.1    9.8    9.1  -20.4    9.4  NGS
 YELL     6.1    7.2    7.3    8.5   20.7   12.1  NGS
 GOLD     1.1    5.9  -14.6    8.9  -45.1   17.4  NGS
 FAIR    17.2    8.4   -2.4   10.6   -2.6   17.6  NGS
 KOKB     0.0   10.9  -38.2   18.6  -56.6   25.2  NGS
 TIDB     3.5   11.4   41.3   17.7   34.3   24.4  NGS
 YAR1    18.2    8.4   46.4   16.0   -6.2   24.6  NGS
 HART    -4.0   14.5  -96.4   25.6  -32.2   35.0  NGS
 TROM    12.5    8.9    4.1   10.9   27.6   16.9  NGS
 WETT     6.2    6.6    6.6   10.1   50.4   18.8  NGS
 KOSG    11.2    5.9   -6.8    8.7   51.7   16.3  NGS
 Additional Sites 
 FORT     3.9   13.2   88.7   22.4  -25.3   28.9  NGS
 MCM4    54.4   26.2   37.1   26.2   38.2   25.4  NGS
 GUAM    11.1   17.0  -49.6   22.6   -4.0   21.6  NGS
 KIT3    20.5   14.4  -26.5   18.1   85.3   24.3  NGS

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