[IGSREPORT-3120] Wk 0870 MIT T2 RNAAC Analyis Report
Thomas
Thomas
Mon Nov 4 13:40:36 PST 1996
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IGS Electronic Report Mon Nov 4 13:40:36 PST 1996 Message Number 3120
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Author: Thomas Herring
Subject: Wk 0870 MIT T2 RNAAC Analyis Report
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MIT R/GNAAC ANALYSIS REPORT GPS-WEEK 0870 Dates: 96sep08 to 96sep14
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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
MIT0870p.SNX RNAAC combination sinex file from all available analysis centers
with the GNAAC sinex files.
MIT0870p.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 0870
IMPACT OF RNAACs on GNAAC Loose solution
RMS change over 95 stations: .69 mm
CENTER RESULTS
For Center EUR VARIANCE FACTOR 14.09
Site dN +- dE +- dU +- Center
(mm) (mm) (mm) (mm) (mm) (mm)
BOGO -3.6 1.3 -6.9 1.2 -9.0 3.2 Center EUR
CAGL -3.2 1.3 -4.2 1.3 0.6 2.9 Center EUR
DELF 1.6 1.2 -18.5 1.2 -0.5 2.5 Center EUR
DENT 0.3 1.2 -20.4 1.2 -2.2 2.8 Center EUR
DOUR -0.3 1.2 -15.7 1.2 -3.2 2.7 Center EUR
HFLK -4.8 1.2 -11.1 1.2 4.4 2.2 Center EUR
MEDI -4.8 1.2 -5.3 1.2 -2.1 2.3 Center EUR
PENC -3.7 1.2 -3.6 1.3 -4.4 2.8 Center EUR
SFER -0.7 1.3 -2.5 1.3 -10.7 4.7 Center EUR
VENE -6.3 2.1 -9.4 3.9 3.4 6.0 Center EUR
WARE 0.7 1.3 -17.3 1.2 7.6 3.3 Center EUR
For Center GIA VARIANCE FACTOR 47.61
Site dN +- dE +- dU +- Center
(mm) (mm) (mm) (mm) (mm) (mm)
AIS1 -7.0 2.7 7.6 4.5 5.4 11.4 Center GIA
BAY1 0.2 4.9 9.6 10.1 25.4 25.4 Center GIA
CHI1 -42.2 51.1 11.3 114.1 -99.0 142.1 Center GIA
CLGO 2.7 3.0 2.1 4.9 -2.0 13.1 Center GIA
GUS1 -3.0 2.8 12.3 4.4 23.6 11.6 Center GIA
KDK1 3.1 3.1 7.2 5.8 9.4 14.2 Center GIA
KEN1 0.6 2.8 10.0 4.9 28.5 12.4 Center GIA
POT1 -41.9 33.4 9.1 56.7 -94.8 89.9 Center GIA
For Center GSI VARIANCE FACTOR 4.52
Site dN +- dE +- dU +- Center
(mm) (mm) (mm) (mm) (mm) (mm)
CCJM 2.4 1.9 6.6 3.0 39.1 8.2 Center GSI
KNYA -6.2 1.9 -17.6 3.0 -4.8 7.9 Center GSI
MZSW 6.0 1.9 -11.7 2.0 -20.0 7.6 Center GSI
OKNW -6.9 2.0 -14.3 3.1 -17.8 8.2 Center GSI
STKW 5.1 1.9 -3.7 2.0 -11.2 7.1 Center GSI
TKBA 5.5 1.9 -10.0 2.0 -26.5 7.1 Center GSI
TOHK 5.4 1.9 -17.7 2.3 -18.5 7.4 Center GSI
For Center PGC VARIANCE FACTOR 1
Site dN +- dE +- dU +- Center
(mm) (mm) (mm) (mm) (mm) (mm)
HOLB 4.1 1.6 -0.2 1.9 -9.5 5.7 Center PGC
NANO -0.8 1.5 0.7 1.8 -1.7 4.4 Center PGC
NEAH -0.4 1.5 0.4 1.9 -5.3 5.1 Center PGC
UCLU 1.8 1.5 4.8 1.9 -14.1 5.3 Center PGC
WILL -1.9 1.5 3.1 1.9 -0.8 4.3 Center PGC
For Center SIR VARIANCE FACTOR 17.67
Site dN +- dE +- dU +- Center
(mm) (mm) (mm) (mm) (mm) (mm)
OHIG -23.0 3.8 -21.9 2.9 -18.3 11.4 Center SIR
[Mailed From: Tom Herring <tah at mtglas.mit.edu>]
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