[IGSREPORT-3046] Wk 0867 MIT T2 RNAAC Analyis Report
Thomas
Thomas
Tue Oct 8 21:52:53 PDT 1996
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IGS Electronic Report Tue Oct 8 21:52:53 PDT 1996 Message Number 3046
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Author: Thomas Herring
Subject: Wk 0867 MIT T2 RNAAC Analyis Report
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MIT R/GNAAC ANALYSIS REPORT GPS-WEEK 0867 Dates: 96aug18 to 96aug24
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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
MIT0867p.SNX RNAAC combination sinex file from all available analysis centers
with the GNAAC sinex files.
MIT0867p.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 0867
IMPACT OF RNAACs on GNAAC Loose solution
RMS change over 96 stations: 1.11 mm
CENTER RESULTS
For Center ASI VARIANCE FACTOR 89.89
Site dN +- dE +- dU +- Center
(mm) (mm) (mm) (mm) (mm) (mm)
CAGL 0.0 1.3 -2.3 1.4 8.5 3.8 Center ASI
MEDI -4.7 1.3 -0.4 1.3 9.5 3.0 Center ASI
VENE -6.8 1.7 1.7 3.0 11.9 6.0 Center ASI
For Center EUR VARIANCE FACTOR 27.74
Site dN +- dE +- dU +- Center
(mm) (mm) (mm) (mm) (mm) (mm)
ANKR -5.9 1.7 -10.2 1.7 5.4 8.1 Center EUR
BOGO -4.8 1.3 -1.8 1.3 1.1 4.2 Center EUR
CAGL 0.0 1.3 -2.3 1.4 8.5 3.8 Center EUR
DELF 4.8 1.4 -15.5 1.3 5.6 3.8 Center EUR
DENT 1.9 1.4 -21.0 1.4 5.8 4.1 Center EUR
DOUR 0.1 1.4 -12.7 1.3 4.8 4.0 Center EUR
HFLK -4.5 1.3 -6.2 1.3 1.6 2.8 Center EUR
MEDI -4.7 1.3 -0.4 1.3 9.5 3.0 Center EUR
PENC -4.5 1.3 -0.7 1.3 3.1 4.1 Center EUR
SFER 0.9 1.5 2.5 1.5 -8.9 7.1 Center EUR
UPAD -1.8 1.5 -4.7 1.4 3.3 7.8 Center EUR
WARE 1.9 1.5 -14.9 1.4 10.6 4.9 Center EUR
For Center GIA VARIANCE FACTOR 51.47
Site dN +- dE +- dU +- Center
(mm) (mm) (mm) (mm) (mm) (mm)
AIS1 -19.7 12.2 -15.1 19.5 14.1 46.0 Center GIA
BAY1 -5.3 3.7 6.2 7.2 17.4 18.7 Center GIA
CLGO 1.9 5.8 3.2 9.0 1.9 25.4 Center GIA
GUS1 -3.9 3.4 9.5 5.4 15.4 15.1 Center GIA
KDK1 -3.5 3.8 7.5 6.8 4.1 18.4 Center GIA
KEN1 -2.6 3.5 7.3 5.8 18.1 16.3 Center GIA
For Center GSI VARIANCE FACTOR 4.32
Site dN +- dE +- dU +- Center
(mm) (mm) (mm) (mm) (mm) (mm)
CCJM 5.1 1.9 7.5 3.1 -3.8 8.0 Center GSI
KNYA -5.9 1.9 -10.9 3.0 -7.7 7.8 Center GSI
MZSW 3.3 1.9 -10.0 2.0 -9.4 7.1 Center GSI
STKW 2.8 1.9 -5.9 2.1 2.5 7.2 Center GSI
TKBA 0.2 1.9 -6.5 2.0 -9.9 7.2 Center GSI
TOHK 3.0 1.9 -9.3 2.3 -2.5 7.4 Center GSI
For Center PGC VARIANCE FACTOR 1.25
Site dN +- dE +- dU +- Center
(mm) (mm) (mm) (mm) (mm) (mm)
HOLB -1.8 2.0 0.9 1.7 -11.0 8.8 Center PGC
NANO -4.2 1.5 -1.0 1.5 1.9 3.6 Center PGC
NEAH -3.9 1.6 -4.1 1.5 11.3 3.4 Center PGC
UCLU -4.1 1.6 3.6 1.5 1.6 4.4 Center PGC
For Center SIR VARIANCE FACTOR 25.19
Site dN +- dE +- dU +- Center
(mm) (mm) (mm) (mm) (mm) (mm)
No uniques sites for center SIR
Giving coordinate adjustments for all sites
ASC1 -7.7 6.5 39.7 23.9 -6.7 23.1 Center SIR
FORT -8.0 3.7 22.3 15.4 -52.7 25.9 Center SIR
KOUR 11.6 5.2 2.0 6.5 -67.8 24.7 Center SIR
LPGS -23.1 15.4 10.5 4.9 -42.2 23.0 Center SIR
CRO1 18.0 11.0 -0.5 3.4 -104.2 24.7 Center SIR
BRMU 35.9 17.7 -2.9 4.2 -60.8 21.7 Center SIR
SANT -24.1 14.6 -13.8 5.4 -13.1 24.4 Center SIR
AREQ -13.5 6.8 -10.2 5.6 -33.1 23.8 Center SIR
BOGT 14.2 4.8 1.1 6.5 -60.4 24.4 Center SIR
RCM5 24.7 14.2 -20.7 9.6 -75.4 21.8 Center SIR
EISL -21.7 9.5 -34.2 21.8 -29.3 21.5 Center SIR
[Mailed From: Tom Herring <tah at mtglas.mit.edu>]
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