Subject: [IGSREPORT-2160] Wk 0825 MIT T2 Analysis Report
From: Thomas Herring
Date: Tue, 14 Nov 1995 21:19:40 PST

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IGS Electronic Report    Tue Nov 14 21:19:40 PST 1995      Message Number 2160
******************************************************************************

Author: Thomas Herring
Subject: Wk 0825 MIT T2 Analysis Report

********************************************************************************
MIT ANALYSIS REPORT GPS-WEEK 0825    Dates: 95oct29  to  95nov04                
********************************************************************************

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
   MIT0825T.SNX   Combined sinex file from all available analysis centers
   MIT0825T.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 each 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
     (b) Week 0825: A second antenna and eccentricity entry was present
         for GOLD A 2.  There was not estimate for this site and the
         entry was ignored.  The eccentricity height was 0.0025 m.
         (See GFZ report).
JPL: (a) Constraints not changed.  No constraints given SINEX file but
     appear to be about 1 meter of the core sites.
     (b) The estimate of the JPL height of FORT seems to be consistently
     40-60 mm higher than the other centers.  Since there is no
     ECCENTRICITY block in the JPL sinex files, we are unable to check
     to see if this is due to an eccentricty error or not.
GFZ: (a) Constraints loosened to +-5 m for positions.
     (b) Week 0825: A second antenna and eccentricity entry was present
         for GOLD A 2.  There was not estimate for this site and the
         entry was ignored.  The eccentricity height was 0.0254 m.
         (This differs from a similar entry in the EMR Sinex files).
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) Week 0825: Starting this week we used the SIO generated Sinex file
     rather than the ones which we have been generating from the GAMIT
     h-files obtained from the SIO Archive.
NGS: (a) Constraints loosened to +-0.1 m for positions: Looser constraints
     generate non-positive definite covariance matrices.
     (b) Week 0825: Starting this week the Earth rotation parameters in the
     NGS covariance matrix seem to have the correct units
     (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) We only include the last three days of the NGS sinex files because
     the APRIORI block was missing from the NGS files.
     
(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   5.3 mm  COMBINED
   X-tran  +-      Y-tran  +-      Z-tran   +-   Scale   +-
   (mm)   (mm)     (mm)   (mm)      (mm)   (mm)  (ppb)  (ppb)
   14.4    2.3     17.3    2.2    -13.0    2.4  -0.934  0.737  COMBINED
 
 Adjustments to core site positions for COMBINED
 SITE    dNorth  +-     dEast   +-    dUp    +- 
          (mm)  (mm)    (mm)   (mm)   (mm)  (mm)
 MADR    -8.8    0.7    5.4    1.1    0.3    3.2  COMBINED
 SANT   -12.9    1.7   -1.1    2.0   13.6    4.0  COMBINED
 ALGO     5.0    0.8    1.0    1.0  -30.6    2.7  COMBINED
 YELL     4.6    0.7    0.7    0.7    9.9    3.1  COMBINED
 GOLD     2.3    0.9   -7.5    1.1   -6.3    5.5  COMBINED
 FAIR     2.7    0.8    1.1    0.9    4.1    3.8  COMBINED
 KOKB    -2.9    1.1   -2.9    2.0    0.6    5.2  COMBINED
 TIDB    -5.6    1.1   13.9    1.5  -15.0    3.8  COMBINED
 YAR1     8.3    1.2    5.6    1.6   -4.4    4.2  COMBINED
 HART    13.2    1.7  -12.8    3.1   32.0    7.4  COMBINED
 TROM     8.8    0.8   -7.4    0.8   -2.2    3.4  COMBINED
 WETT    -6.6    0.7    7.0    0.9   -1.1    3.3  COMBINED
 KOSG     3.6    0.7   -4.3    0.8   -1.1    2.9  COMBINED
 Additional Sites 
 FORT    -1.6    1.6    8.9    3.1  -16.3    6.2  COMBINED
 MCM4    -1.1    1.8   -1.5    2.0    5.9    5.1  COMBINED
 GUAM    -0.6    1.5    8.0    3.1    1.8    5.0  COMBINED
 KIT3    -7.2    1.3   -1.1    2.2    6.8    3.7  COMBINED

 3.0 CENTER FITS TO ITRF 1993
 CENTER EMR
 -------------------
 VARIANCE RESCALING FACTOR FOR EMR 40.1189
 
 Transformation of loose solution EMR to ITRF93
 -----------------------------------------------
 For   13 Sites, RMS after 7 parameter transformation   7.4 mm  EMR
   X-tran  +-      Y-tran  +-      Z-tran   +-   Scale   +-
   (mm)   (mm)     (mm)   (mm)      (mm)   (mm)  (ppb)  (ppb)
    8.7    3.2    142.8    3.1     -2.0    3.3  -0.953  1.036  EMR
 
 Adjustments to core site positions for EMR
 SITE    dNorth  +-     dEast   +-    dUp    +- 
          (mm)  (mm)    (mm)   (mm)   (mm)  (mm)
 MADR    -7.9    4.5    7.2    7.4   -9.4   16.9  EMR
 SANT   -17.4   10.2    8.3   12.6   -4.7   22.0  EMR
 ALGO     2.0    5.0    6.8    7.8  -21.3   13.5  EMR
 YELL     3.3    4.8   -1.3    6.9   16.9   15.1  EMR
 GOLD     4.3    5.2  -11.5   10.8   -2.6   25.8  EMR
 FAIR     6.1    5.4   -3.0    8.4  -14.5   18.3  EMR
 KOKB    -1.1    6.5   -2.3   11.3    9.5   27.4  EMR
 TIDB    -9.9    6.2   10.6    9.3   23.5   20.7  EMR
 YAR1    13.5    6.2   13.7    9.3   -1.4   20.9  EMR
 HART    11.0    8.9  -24.7   15.0   -3.9   34.8  EMR
 TROM    10.6    5.4  -11.2    7.2    3.6   18.0  EMR
 WETT    -5.6    4.5    6.4    7.1   -1.3   16.7  EMR
 KOSG     2.8    4.3   -4.1    6.4    5.4   15.0  EMR
 Additional Sites 
 FORT     7.2    8.6   22.7   15.2  -19.6   33.1  EMR
 MCM4    -0.2    8.5  -21.1   10.7   19.4   25.9  EMR
 GUAM     2.0    9.0  -19.6   17.7   17.3   25.9  EMR
 KIT3    -7.5    8.3   -8.6   14.7   25.6   24.1  EMR
 
 CENTER JPL
 -------------------
 VARIANCE RESCALING FACTOR FOR JPL 10.7448
 
 Transformation of loose solution JPL to ITRF93
 -----------------------------------------------
 For   13 Sites, RMS after 7 parameter transformation   6.6 mm  JPL
   X-tran  +-      Y-tran  +-      Z-tran   +-   Scale   +-
   (mm)   (mm)     (mm)   (mm)      (mm)   (mm)  (ppb)  (ppb)
    4.0    2.9      8.4    2.8    -37.8    3.0  -0.987  0.929  JPL
 
 Adjustments to core site positions for JPL
 SITE    dNorth  +-     dEast   +-    dUp    +- 
          (mm)  (mm)    (mm)   (mm)   (mm)  (mm)
 MADR   -11.8    1.4    2.0    2.8  -10.6    6.1  JPL
 SANT   -12.8    3.1    2.2    3.7   19.1    7.1  JPL
 ALGO     7.7    1.7    3.7    2.9  -35.5    5.4  JPL
 YELL     7.4    1.7    0.6    2.6    8.7    6.1  JPL
 GOLD     3.9    2.0  -14.7    4.4   -5.1   11.1  JPL
 FAIR     3.0    1.7   -1.1    2.7    6.5    6.7  JPL
 KOKB    -4.6    1.9   -1.6    3.6   -3.2    7.9  JPL
 TIDB    -7.4    2.0   14.2    2.9  -18.8    6.4  JPL
 YAR1     9.4    2.1   11.9    3.1   -7.7    6.9  JPL
 HART    16.1    2.9  -10.2    5.6   51.3   12.0  JPL
 TROM     8.6    1.7   -9.1    2.4   -2.1    6.4  JPL
 WETT    -6.4    1.5    2.8    2.6   -0.6    6.4  JPL
 KOSG     2.9    1.4   -6.2    2.4   -2.0    5.6  JPL
 Additional Sites 
 FORT    -8.0    2.9   12.4    5.4    9.1   12.1  JPL
 MCM4    -4.5    3.1   -1.4    3.7  -18.0    8.9  JPL
 GUAM    -2.9    2.6    8.6    5.3   -7.9    7.4  JPL
 KIT3     1.7    2.6    5.8    4.7   -0.9    7.2  JPL
 
 CENTER GFZ
 -------------------
 VARIANCE RESCALING FACTOR FOR GFZ 47.6
 
 Transformation of loose solution GFZ to ITRF93
 -----------------------------------------------
 For   13 Sites, RMS after 7 parameter transformation   6.9 mm  GFZ
   X-tran  +-      Y-tran  +-      Z-tran   +-   Scale   +-
   (mm)   (mm)     (mm)   (mm)      (mm)   (mm)  (ppb)  (ppb)
  106.3    3.0     42.4    2.9    -20.0    3.1  -0.410  0.964  GFZ
 
 Adjustments to core site positions for GFZ
 SITE    dNorth  +-     dEast   +-    dUp    +- 
          (mm)  (mm)    (mm)   (mm)   (mm)  (mm)
 MADR    -6.4    3.4    5.4    6.3   14.6   16.5  GFZ
 SANT   -19.9    7.3   -8.9    8.6    7.5   20.3  GFZ
 ALGO     5.1    3.6    5.8    6.6  -43.6   15.7  GFZ
 YELL     4.4    3.6    6.8    5.4   20.0   16.9  GFZ
 GOLD     1.4    4.8   -6.9    9.6  -14.1   29.1  GFZ
 FAIR     4.0    3.8    3.8    5.7    7.8   17.9  GFZ
 KOKB    -3.4    4.5   -7.4    8.6  -10.2   23.6  GFZ
 TIDB   -13.2    5.1    7.0    7.4   -6.2   20.0  GFZ
 YAR1     9.0    5.2   20.1    7.2  -14.7   21.2  GFZ
 HART    19.0    6.8  -21.5   13.6   31.5   37.5  GFZ
 TROM     9.1    3.8   -7.5    5.4    7.8   18.1  GFZ
 WETT    -4.9    3.5    9.6    6.1    4.0   16.9  GFZ
 KOSG     5.5    3.3   -0.8    5.6   -4.2   15.9  GFZ
 Additional Sites 
 FORT   -11.9    5.9    2.5   10.6  -10.0   25.0  GFZ
 MCM4    -8.7    6.7   -4.9    8.2   29.9   26.8  GFZ
 GUAM    -4.3    6.1    2.1   13.1   -4.3   23.0  GFZ
 KIT3    -3.2    5.8   -4.3    9.4   24.4   18.4  GFZ
 
 CENTER COD
 -------------------
 VARIANCE RESCALING FACTOR FOR COD 10.7508
 
 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)
    8.1    2.6      1.3    2.5    -10.0    2.7  -1.434  0.836  COD
 
 Adjustments to core site positions for COD
 SITE    dNorth  +-     dEast   +-    dUp    +- 
          (mm)  (mm)    (mm)   (mm)   (mm)  (mm)
 MADR   -11.1    1.1    3.7    1.5    9.0    4.5  COD
 SANT    -8.8    2.7    0.9    3.2   14.7    6.1  COD
 ALGO     4.9    1.1    0.3    1.4  -26.6    4.2  COD
 YELL     4.1    0.9   -0.4    0.9   20.3    4.4  COD
 GOLD     2.1    1.3   -8.1    1.4   -3.5    7.2  COD
 FAIR     0.7    1.2    0.1    1.2    5.7    5.5  COD
 KOKB    -4.0    1.9   -3.7    2.9    6.0    8.2  COD
 TIDB    -3.3    1.7   16.3    2.3  -28.3    6.1  COD
 YAR1     7.5    1.8    0.5    2.4   -3.4    6.6  COD
 HART    12.3    2.7   -6.9    4.5   27.7   11.7  COD
 TROM     8.8    1.2   -6.5    1.1   -5.6    4.9  COD
 WETT    -8.6    1.1    6.4    1.3   -7.3    4.9  COD
 KOSG     1.9    1.0   -4.9    1.2   -8.8    4.4  COD
 Additional Sites 
 FORT     0.8    2.3    7.3    5.0  -37.1    9.2  COD
 MCM4    -1.9    3.0    2.5    2.9   18.3    8.0  COD
 GUAM    -1.7    2.5   19.0    4.8   13.3    8.7  COD
 KIT3   -12.8    2.0    0.6    3.3   -2.1    5.8  COD
 
 CENTER SIO
 -------------------
 VARIANCE RESCALING FACTOR FOR SIO 12.2462
 
 Transformation of loose solution SIO to ITRF93
 -----------------------------------------------
 For   13 Sites, RMS after 7 parameter transformation   6.6 mm  SIO
   X-tran  +-      Y-tran  +-      Z-tran   +-   Scale   +-
   (mm)   (mm)     (mm)   (mm)      (mm)   (mm)  (ppb)  (ppb)
   14.8    2.9    179.6    2.8   -108.2    3.0   0.133  0.927  SIO
 
 Adjustments to core site positions for SIO
 SITE    dNorth  +-     dEast   +-    dUp    +- 
          (mm)  (mm)    (mm)   (mm)   (mm)  (mm)
 MADR    -6.3    4.0    4.3    6.9    6.0   19.1  SIO
 SANT   -33.0    8.2    0.2   10.7  -34.0   24.9  SIO
 ALGO     8.4    4.2    0.6    6.8  -25.5   13.2  SIO
 YELL     3.0    3.8    3.3    5.6   21.7   14.4  SIO
 GOLD     8.4    5.2   -7.8   11.4   11.8   32.6  SIO
 FAIR     5.3    4.4    1.0    6.6   -6.5   20.6  SIO
 KOKB     1.7    6.4    0.4    9.5    5.6   26.5  SIO
 TIDB   -11.0    5.6   15.2    7.7   -2.2   22.3  SIO
 YAR1     4.1    5.8    9.2    8.0   -1.7   23.9  SIO
 HART    15.3    7.9  -24.5   14.0   25.1   36.1  SIO
 TROM    10.7    4.2  -11.2    5.2    5.0   16.0  SIO
 WETT    -5.5    3.7   12.1    5.8   -3.6   14.9  SIO
 KOSG     5.7    3.7   -3.6    6.0   -1.5   18.6  SIO
 Additional Sites 
 FORT     1.8    9.5   22.0   11.7   -0.2   20.1  SIO
 MCM4     6.3    8.6  -12.4    9.3   45.0   21.2  SIO
 GUAM     2.0    7.7    0.0   14.7   29.8   20.4  SIO
 KIT3    -5.8    6.9   12.0    9.7    8.1   12.0  SIO
 
 CENTER NGS
 -------------------
 VARIANCE RESCALING FACTOR FOR NGS 170.5
 
 Transformation of loose solution NGS to ITRF93
 -----------------------------------------------
 For   13 Sites, RMS after 7 parameter transformation  14.0 mm  NGS
   X-tran  +-      Y-tran  +-      Z-tran   +-   Scale   +-
   (mm)   (mm)     (mm)   (mm)      (mm)   (mm)  (ppb)  (ppb)
   45.0    6.1    212.1    5.9    152.5    6.3   6.315  1.960  NGS
 
 Adjustments to core site positions for NGS
 SITE    dNorth  +-     dEast   +-    dUp    +- 
          (mm)  (mm)    (mm)   (mm)   (mm)  (mm)
 MADR    -2.1   10.0    0.0   11.2  -14.6   20.0  NGS
 SANT   -20.8   18.2  -33.5   18.2  -23.4   19.3  NGS
 ALGO    22.5   12.7   -9.5   18.0  -38.5   14.6  NGS
 YELL     1.0   15.3   -7.6   23.1   -4.9   21.8  NGS
 GOLD     8.1   10.2  -18.7   18.7  -42.9   29.5  NGS
 FAIR    -0.1   17.1  -16.9   24.1  -24.7   24.8  NGS
 KOKB     8.5   24.6  120.0   45.0  -60.9   76.5  NGS
 TIDB    -3.0   12.7  -52.0   19.1   86.3   29.4  NGS
 YAR1    13.1   13.8   15.7   17.8   95.4   31.7  NGS
 HART     9.2   19.3  -42.8   27.0   -8.8   75.4  NGS
 TROM    -2.2   12.2    5.4   14.9   -2.6   20.0  NGS
 WETT    -9.6   10.1   17.2   11.5   21.1   19.8  NGS
 KOSG     2.8   10.0    5.5   11.1   18.6   18.6  NGS
 Additional Sites 
 FORT    17.0   14.5   16.1   22.7   -2.8   27.4  NGS
 MCM4    38.4   14.9  -44.4   19.3   31.2   23.9  NGS
 GUAM   -26.8   27.8  -64.5   35.0   -4.6   34.8  NGS
 KIT3   -35.3   17.8  -12.3   18.5   47.4   23.7  NGS

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