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WARSAW UNIWERSITY OF TECHNOLOGYWARSAW UNIWERSITY OF TECHNOLOGYInstitute of Geodesy and Geodetic AstronomyInstitute of Geodesy and Geodetic Astronomy
PlPl. Politechniki 1, 00. Politechniki 1, 00--661 Warsaw, Poland 661 Warsaw, Poland iggaigga@gik.pw.edu.pl, phone (+48 22) 6@gik.pw.edu.pl, phone (+48 22) 62222--8585--1515
Mariusz Figurski, Lech Kujawa
GEODETIC AND NON GEODETIC APPLICATIONS GEODETIC AND NON GEODETIC APPLICATIONS PERFORMED BY WUT LACPERFORMED BY WUT LAC
EUREF Permanent GPS Network 4th Local Analysis Centres Workshop18-19 September, 2003Graz, AUSTRIA
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Institute of Geodesy and Geodetic AstronomyInstitute of Geodesy and Geodetic AstronomyInstitute of Geodesy and Geodetic Astronomy
The basic responsibilities of our GPS Analysis Centreinclude:
- processing selected part of permanent EUREFnetwork
- processing periodic campaign CEGRN and CEGRN2, Extended SAGET, EUVN
- processing local and regional campaigns for geophysicaland geodetic needs in the area of Poland
- processing tropospheric zenith delay and TEC.
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Data acquisition system at the Józefosław observatory
TRIMBLE 4000SSE
ASHTECH Z-18GPS-GLONASSTurbo Rogue
SNR 8000
TRIMBLE 4000CORSTATION
RTCM104
DGPSRTK
ZZG AbsoluteGravimeter
TidalGravimeter
A/Dconverter
ServerPC/LINUX METEO-SET
modem radiomodem
Rubidiumstandard
Rubidiumstandard
Rubidiumstandard
GLOBALPOSITIONINGSYSTEM
GRAVITYMEASURMENTS
GRAVITYMEASURMENTS
ONMERIDIANBASELINE METEOROLOGICAL
MEASURMENTS
ASTROMETRICLATITUDESERVICE
radiomodemmodem ANALYSIS CENTRE
ServerPC/LINUX
INTERNETconnection
Work Station Work StationHP J200
ServerPC/LINUX
ICMMNWPM
METEO-datafrom IMWM
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WUT LAC came into being in 1995 year. Since January 1996 year takes part in study active EUREF network (EPN). Worked out by WUT part network EPN LAC it hugs 45 station disposed in grounds of European continent.Since 1997 year till September 2003 worked out year network by WUT LAC, from 20 station broaden to 43 station.
DARE1229
SASS, JOZ21235
KATO, ZYWI1231
INVE, PLYM, SULD
1225
OBET1225
KRAW (Kraków)1203
THU31201
MIKL1192
BOGI1185
SPT01174
StationGPS WEEK
SULP1137
PDEL,LAGO1101
VARS1092
TRAB1047
ESCO1027
UZHL1020
LLIV1015
BUCU1002
VLNS1000
NSSP987
GLSV957
StationGPS WEEK
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Data base GPS/GLONASS EUREF-WUT
IFAG-BKG
SIO
CDDIS
CODE
GRAZ
IGN
FIRE WALL
NTPCYFRONET
Workstation 1 Workstation 2 Workstation 3
The functional scheme ofsystem of data processing GPS observation, applied in WUT EUREF LAC
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Institute of Geodesy and Geodetic AstronomyInstitute of Geodesy and Geodetic AstronomyInstitute of Geodesy and Geodetic Astronomy
Short description of strategy:
- software: Bernese 4.2- orbits, ERP - IGS final- BOR1, WTZR, ONSA constrained (X,Y -0.1 mm, Z-1 mm)- no a priori tropospheric model, Dry-Niell asmapping function
- troposphere modelled each 1 hours/each station(absolute and relative constraints 5 m )
- ionosphere only modelled for ambiguityresolution step
- tidal displacement: IERS96 convention, ocean loading applied- geopotential model: JGM- DE200 planetary ephemeris applied- adjustment: weighted least squares
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Institute of Geodesy and Geodetic AstronomyInstitute of Geodesy and Geodetic AstronomyInstitute of Geodesy and Geodetic AstronomyResults of data processing and analyses
GPS Observation AnalysesChanges of the coordinates obtained from day-to-day GPS data processing
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Institute of Geodesy and Geodetic AstronomyInstitute of Geodesy and Geodetic AstronomyInstitute of Geodesy and Geodetic AstronomyResults of data processing and analyses
GPS Observation AnalysesGPS Observation AnalysesChanges of the coordinates obtained from 1Changes of the coordinates obtained from 1--hour GPS observations filtered to 3hour GPS observations filtered to 3σσ
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ADDNEQCRD WEEKSOLUTION
NEQCRD
CRDGPS WEEK
6
0
FIX CRD
WUTO NE DAY
SO LUTIO N
WUTTRO SINEX
General scheme of computational strategy applied until week 1220 GPS in the Local Analysis Center WUT EUREF- so called „old” computational strategy. In the presented solution the TZD values were determined in a single process with station coordinates estimation. This solution’s advantage was relatively short computational time and storing the normal equations with the station
coordinates data only.
The main disadvantage are the station coordinates for which the TZD values were determined. Recorded in the SINEX TRO format, they were characterized by different values for each observation day, although they belonged to the same GPS week.
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ADDNEQCRD WEEKSOLUTION
NEQCRD
CRDGPS WEEK
6
0
NEQCRD+TRP
6
0
FIX CRD
FIX ALL CRD
ADDNEQTRP WEEKSOLUTION
SINEX TRO
Scheme of the new strategy of GPS observations study applied in WUT LAC. The main change introduced in the study is stations’ coordinates and the determined tropospheric parameters storing in the normal equations file. The tropospheric parameters are estimated only after completion of the computational process on the last day of the week.
At first, the weekly solution is generated (stations’ coordinates – the official product of WUT LAC). The tropospheric parameters are determined using the obtained values, considered as error-free, and applying ADDNEQ software and the prepared in advance normal equations files. Thecomputational process is longer but the determined tropospheric parameters (TZD) are burdened with smaller errors. It my numeric analyses' wereconducted was on appro folding from about 40 station EUREF / IGS
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WUT old and new solution
2,15
2,20
2,25
2,30
2,35
2,40
2,45
2,50
2,55
2,60
52600 52650 52700 52750 52800 52850 52900MJD
TZD
[m]
WUT - new solutionWUT - old solution
The figure presents TZD obtained according to the new and old computational strategies for Józefosław station.
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Station HOFN
-0,015
-0,010
-0,005
0,000
0,005
0,010
0,015
52600 52650 52700 52750 52800 52850 52900
MJD
Diff
eren
ces
TZD
[m]
HOFN WUT new-old solution
The figure presents TZD differences obtained according to the new and old computational strategies for HOFN station (Iceland).
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WUT_new_solution - WUT_old_solution
-0,015
-0,010
-0,005
0,000
0,005
0,010
52650 52700 52750 52800 52850 52900
MJD
TZD
[m
]WUT WUT WUT LocalLocalLocal AnalysisAnalysisAnalysis CentreCentreCentre
The figure presents TZD differences obtained according to the new and old computational strategies for Józefosław station.
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JOZE RMS-TZD
0,0000
0,0005
0,0010
0,0015
0,0020
0,0025
0,0030
0,0035
0,0040
52650 52700 52750 52800 52850 52900
MJD
RM
S [m
]
WUT_final_solutionWUT_old_solution
Temporal plot of RMS error change of TZD calculation for Józefosław station. The figure presents results obtained from WUT EUREF final solution – blue and yellow - WUT EUREF old strategy. Application of the new strategy of TZD computation resulted in increase of the solution precision from 0.9 mm to 0.7-0.8 mm.
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HOFN RMS-TZD
0,0000
0,0050
0,0100
0,0150
0,0200
0,0250
52650 52700 52750 52800 52850 52900
MJD
RM
S TZ
D [m
]
WUT final solutionWUT old solution
Temporal plot of RMS error change of TZD calculation for HOFNstation. The figure presents results obtained from WUT EUREF final solution – green and red - WUT EUREF old strategy.
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Station Józefosław
-0,10
-0,08
-0,06
-0,04
-0,02
0,00
0,02
0,04
52680 52700 52720 52740 52760 52780 52800 52820 52840 52860 52880
MJD
TZD
[m]
WUT_final-WUT_PPP
Plot of TZD differences obtained according to WUT EUREF final and WUT-PPP solutions. The series of TZD differences includes the first half of the 2003. The series of differences ranges from -0.15 to 0.15. The difference of about -0.9 m that occurred on modified julian day 52776 is an uncorrected computational error.
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JOZE RMS-TZD
0,000
0,001
0,002
0,003
0,004
0,005
0,006
0,007
52600 52650 52700 52750 52800 52850 52900
MJD
RM
S [m
]
WUT_final_solutionWUT_ppp_solution
Plot of RMS error change of TZD calculation for Józefosław station. The figure presents results obtained from PPP solution – dark blue and WUT EUREF final. Application of PPP solution causes increase of the error of TZD calculation only up to the level of 3 mm as compared with 1 mm obtained from WUT EUREF solution
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OBS
IGU
MBPE
CP
PPPCRD
Kod + Faza RNXMSTORB-STD
CODSPP
RXOBV3
SAT DCB
GPSEST - RESL4
EST. ION, DCB SAT, DCB RECMAP FUN - 1/COSZ
DEL RES > 0.4m L4
OUT RES
GPSEST - IONL4
EST. ION, DCB RECMAP FUN - MSLM
GPSEST - IONDTEC
EST. IONMAP FUN - MSLM
IONDTEC IONEX ION TEC DCB REC IONEX
INX2GRDSOFT GMT
DTEC MAP
TECMAP
ARCH
PPP PROC
Scheme of one hour GPS processingstrategy.
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Ionospheric maps got with study one hour GPS observation. 2003.04.04
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Antarctic ionosphereric maps obtained from the GPS observations , 2003.04.29.
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TOPEX-ION_GPS
-15
-10
-5
0
5
10
-40 -20 0 20 40 60 80Longitude
TEC
U T-HIMT-codT-jpl
The figure presents diffrences TEC obtained from TOPEX, CODE, JPL and WUT one hour ionosphere model (HIM).
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Conclusions and future
• To improve the study of one hour GPS observations.
• The conduct the exact analyses’ of calculacion the TZD with GPS and GLONASS observation.
• The conduct in process the analysis of the PPP strategy to the calculation TZD.