[IGSREPORT-9153] Wk 1153 MIT T2 RNAAC Analyis Report
Tom Herring
tah at chandler.mit.edu
Thu Apr 4 00:38:28 PST 2002
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IGS Electronic Report 04 Apr 00:39:08 PST 2002 Message Number 9153
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Author: Thomas Herring
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MIT R/GNAAC ANALYSIS REPORT GPS-WEEK 1153 Dates: 02feb10 to 02feb16
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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
MIT1153p.SNX RNAAC combination sinex file from all available analysis centers
with the GNAAC sinex files.
MIT1153p.SUM Name of this summary file
0.0 Starting Week 1016 we starting using ITRF97
0.1 Starting Week 0939 we starting using ITRF96 and its reference site list.
0.2 Starting Week 0901 we started using a new apriori file not Non-ITRF94 coordinates
based on the analysis of week 0822-0900 sinex files. This change will
effect the corrdinate corrections given in this summary.
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. Starting Week 0893 we
stopped using MADR as a core site.
Starting Week 0939: 47 Reference sites are used:
Sig N Sig E Sig U
(m) (m) (m)
VILL 0.0027 0.0022 0.0032
MAS1 0.0031 0.0028 0.0031
FORT 0.0029 0.0031 0.0040
BRAZ 0.0031 0.0037 0.0068
KOUR 0.0028 0.0036 0.0070
OHIG 0.0042 0.0048 0.0053
BRMU 0.0023 0.0021 0.0032
THU1 0.0022 0.0023 0.0038
SANT 0.0031 0.0036 0.0042
AREQ 0.0041 0.0045 0.0052
WES2 0.0021 0.0019 0.0031
GODE 0.0020 0.0019 0.0028
ALGO 0.0020 0.0019 0.0028
NLIB 0.0021 0.0020 0.0039
MDO1 0.0021 0.0021 0.0036
PIE1 0.0021 0.0021 0.0037
YELL 0.0021 0.0021 0.0030
GOL2 0.0021 0.0021 0.0031
DRAO 0.0021 0.0021 0.0034
FAIR 0.0024 0.0022 0.0028
KOKB 0.0028 0.0027 0.0033
KWJ1 0.0034 0.0035 0.0042
MAC1 0.0040 0.0038 0.0044
TID2 0.0037 0.0033 0.0039
HOB2 0.0038 0.0034 0.0050
GUAM 0.0034 0.0036 0.0038
TSKB 0.0031 0.0032 0.0041
SHAO 0.0031 0.0033 0.0043
PERT 0.0037 0.0032 0.0042
YAR1 0.0036 0.0030 0.0029
IRKT 0.0029 0.0036 0.0037
LHAS 0.0031 0.0036 0.0041
DAV1 0.0039 0.0040 0.0050
KERG 0.0037 0.0038 0.0044
KIT3 0.0029 0.0033 0.0037
MALI 0.0034 0.0040 0.0046
ZWEN 0.0027 0.0027 0.0038
HART 0.0035 0.0039 0.0043
TROM 0.0025 0.0023 0.0028
MATE 0.0027 0.0024 0.0029
GRAZ 0.0027 0.0023 0.0022
POTS 0.0026 0.0022 0.0025
WTZR 0.0026 0.0022 0.0023
ONSA 0.0026 0.0022 0.0025
NYAL 0.0025 0.0022 0.0037
KOSG 0.0026 0.0022 0.0023
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 1153
IMPACT OF RNAACs on GNAAC Loose solution
RMS change over 163 stations: 1.03 mm
CENTER RESULTS
For Center AUS VARIANCE FACTOR 51.86
Site dN +- dE +- dU +- Center
(mm) (mm) (mm) (mm) (mm) (mm)
AUST -0.4 0.5 0.2 1.1 0.0 2.3 Center AUS
STR1 -0.3 0.5 0.1 1.4 -0.1 2.7 Center AUS
For Center SIR VARIANCE FACTOR 93.37
Site dN +- dE +- dU +- Center
(mm) (mm) (mm) (mm) (mm) (mm)
BOGA 7.5 0.7 2.4 0.8 53.7 2.3 Center SIR
BRAZ 5.9 1.0 8.9 1.2 -8.8 3.6 Center SIR
CART 1.1 1.5 3.0 2.0 53.5 10.4 Center SIR
CRAT 14.6 0.9 -23.0 1.2 24.7 4.3 Center SIR
CUIB 8.5 1.0 5.7 1.2 -8.3 4.5 Center SIR
ESTI -1.5 0.7 19.9 0.8 57.2 2.4 Center SIR
IGM0 9.3 1.1 2.7 1.0 -26.4 4.4 Center SIR
IMPZ -2.5 0.9 1.6 1.2 64.0 4.7 Center SIR
MANU -3.9 1.1 -1.6 1.4 33.1 7.0 Center SIR
MARA 20.8 0.8 6.2 0.9 11.0 4.6 Center SIR
PALM 8.7 0.9 12.7 0.8 -132.5 2.5 Center SIR
PARA 10.5 1.2 4.2 1.3 -10.0 5.0 Center SIR
POAL 30.8 1.4 -16.6 1.4 25.5 6.0 Center SIR
PUR3 2.6 0.8 -2.3 0.8 8.0 3.5 Center SIR
RECF 15.2 0.8 -22.1 1.2 17.8 4.0 Center SIR
RIOD 24.7 1.3 -22.0 1.4 24.4 5.8 Center SIR
RWSN 41.2 1.3 -5.6 1.0 25.8 4.7 Center SIR
SALV 17.9 1.0 -23.4 1.2 22.1 4.5 Center SIR
SLOR -1.6 0.9 22.7 1.0 59.6 4.2 Center SIR
TEGU -2.7 0.9 21.9 1.0 58.9 4.0 Center SIR
UEPP 7.7 1.1 11.1 1.3 -5.7 4.4 Center SIR
VBCA -2.3 0.9 -0.5 0.8 -73.7 2.5 Center SIR
VICO 11.3 1.1 6.5 1.2 2.0 4.4 Center SIR
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