[IGSREPORT-3561] Wk 0890 MIT T2 RNAAC Analyis Report
Thomas
Thomas
Fri Mar 21 02:54:13 PST 1997
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IGS Electronic Report Fri Mar 21 2:54:13 PST 1997 Message Number 3561
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Author: Thomas Herring
Subject: Wk 0890 MIT T2 RNAAC Analyis Report
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MIT R/GNAAC ANALYSIS REPORT GPS-WEEK 0890 Dates: 97jan26 to 97feb01
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MIT (Massachusetts Institute of Technology)
Room 54-618
77 Massachusetts Avenue,
Cambridge, MA 02139
e-mail: tah at mtglas.mit.edu
tel: (617)253-5941 (Tom Herring)
fax: (617)253-1699
PRODUCTS GENERATED:
The following products are generated and uploaded into CDDIS @ NASA/GSFC
MIT0890p.SNX RNAAC combination sinex file from all available analysis centers
with the GNAAC sinex files.
MIT0890p.SUM Name of this summary file
1.0 Analysis Procedures:
(1) Each centers sinex solutions are de-constrained before
combination. When center constraints are available, the
constraints are loosened to +-1 meters.
(2) Covariance matrices from each center are re-scaled based
on the change in chi**2 when the RNAAC's sinex file is
combined with the loose combination of the GNAAC's
sinex files. To generate reasonable sigmas, the scale factor
is set at 0.3 times the chi**2/degree of freedom increment.
(3) The tight solution is generated with the following constraints on
the ITRF94 core sites. In this analysis, the loose g-sinex file
is combined with the RNAAC sinex files.
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) The summary below gives
(a) The RMS difference between the GNAAC loose analysis and
the GNAAC+RNAAC loose analysis. If this RMS is small then the
RNAAC combination is not effecting the global coordinates solution
significiantly.
(b) For each RNAAC Center we give:
(b.1) the VARIANCE rescaling factors used (determined as
discussed above) and
(b.2) the adjustment to the apriori coordinates
of the sites for each RNAAC which are not included in the GNAAC
analyses. The apriori coordinates are based on the analysis
of the first five weeks of RNAAC sinex files. When an RNAAC
has no unique sites, the adjustments are given for all sites
in the center based on the analysis from that center alone.
SUMMARY OF POSITIONS FOR WEEK 0890
IMPACT OF RNAACs on GNAAC Loose solution
RMS change over 104 stations: 1.33 mm
CENTER RESULTS
For Center EUR VARIANCE FACTOR 8.47
Site dN +- dE +- dU +- Center
(mm) (mm) (mm) (mm) (mm) (mm)
BOGO 8.0 1.2 -1.1 1.2 -14.8 2.0 Center EUR
CAGL 11.9 1.3 -0.6 1.3 8.0 2.0 Center EUR
DELF 12.1 1.2 -12.9 1.2 -6.4 2.0 Center EUR
DENT 12.1 1.2 -13.8 1.2 -4.5 2.0 Center EUR
DOUR 12.6 1.2 -9.7 1.2 -11.6 2.2 Center EUR
EBRE 12.4 1.2 2.0 1.3 24.8 2.6 Center EUR
HFLK 13.4 1.2 -5.1 1.2 0.0 2.1 Center EUR
JOEN 18.4 1.3 -6.4 1.3 24.4 3.9 Center EUR
KIR0 18.4 1.2 -0.4 1.2 55.7 3.8 Center EUR
MAR6 14.4 1.2 0.6 1.2 6.7 3.6 Center EUR
MEDI 5.9 1.2 5.1 1.2 -1.3 1.9 Center EUR
MOPI -1.5 1.2 1.5 1.2 -11.1 2.2 Center EUR
OSLO 18.1 1.2 10.3 1.2 -29.7 3.9 Center EUR
PENC 10.3 1.2 2.0 1.3 -12.2 2.2 Center EUR
RIGA 16.2 1.3 0.8 1.3 -10.5 4.3 Center EUR
SFER 17.1 1.3 2.7 1.3 -9.3 7.7 Center EUR
STAV 13.4 1.2 0.8 1.2 -6.4 3.3 Center EUR
SVTL 16.1 1.4 2.3 1.4 -8.6 4.9 Center EUR
TRON 17.5 1.2 -2.9 1.2 -6.2 3.7 Center EUR
VAAS 15.0 1.2 -2.3 1.2 -23.4 3.8 Center EUR
VARD 17.8 1.3 1.9 1.3 -6.6 5.0 Center EUR
VENE 14.3 1.2 -7.7 1.2 -7.2 2.4 Center EUR
VIL0 17.4 1.2 -1.5 1.2 0.7 3.9 Center EUR
VIS0 14.7 1.3 -0.8 1.2 5.2 3.8 Center EUR
WARE 11.5 1.2 -11.3 1.2 -6.6 2.6 Center EUR
WROC 9.0 1.2 5.7 1.2 0.0 2.6 Center EUR
For Center GSI VARIANCE FACTOR 3.14
Site dN +- dE +- dU +- Center
(mm) (mm) (mm) (mm) (mm) (mm)
CCJM 2.1 2.0 45.1 3.1 10.8 7.8 Center GSI
KNYA -1.7 1.9 24.4 2.7 19.4 6.5 Center GSI
MZSW 15.7 1.9 5.1 2.3 -22.6 6.5 Center GSI
OKNW -3.7 2.0 17.6 2.9 -16.6 7.0 Center GSI
STKW 9.0 1.9 13.2 2.3 25.6 6.1 Center GSI
TKBA 14.9 1.9 9.5 2.1 -7.8 6.0 Center GSI
TOHK 8.6 1.9 10.1 2.3 -17.2 6.4 Center GSI
For Center PGC VARIANCE FACTOR 1
Site dN +- dE +- dU +- Center
(mm) (mm) (mm) (mm) (mm) (mm)
HOLB 7.4 1.5 6.4 1.8 -9.6 5.1 Center PGC
NANO 3.3 1.4 9.8 1.7 -9.1 4.0 Center PGC
NEAH 4.9 1.4 13.5 1.8 -7.3 4.7 Center PGC
UCLU 7.3 1.4 18.2 1.7 -13.9 4.8 Center PGC
WSLR 0.1 1.4 -7.6 1.7 -3.2 3.7 Center PGC
[Mailed From: Tom Herring <tah at mtglas.mit.edu>]
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