the new position and velocity solution dgf07p01 of igs ...the new position and velocity solution...
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The new position and velocity solution DGF07P01 ofIGS Regional Network Associate Analysis Centre
SIRGAS (IGS RNAAC SIR)
The new position and velocity solution DGF07P01 ofIGS Regional Network Associate Analysis Centre
SIRGAS (IGS RNAAC SIR)
AGU Fall Meeting, San Francisco, December 10-14, 2007AGU Fall Meeting, San Francisco, December 10-14, 2007
1. Motivation: In May 2007 at the AGU Joint Assembly in Acapulco, Mexico, a new priliminary SIRGAS position and veloc-ity solution was presented. After the introduction of the new ITRF2005 (IGS05, respectively) and the absolute phase centre variations, the IGS RNAAC SIR at DGFI is reprocessing weekly solutions since GPS week 1860 (July 1996). The new IGS RNAAC SIR solution DGF07P01 presented here contains 168 reprocessed weeks, 53 weeks more than the preliminary solution of May 2007.
2. Reprocessing: The IGS RNAAC SIR reprocessed 168 weeks between 2002 to 2007 (GPS weeks 1147 to 1450). The reprocessing of the missing weeks of 2003/2004, and of the second half of 2005 is in progress. All weeks are computed with the Bernese Processing Engine (BPE) version 5.0 using absolute phase centre corrections instead of relative. The reference frame is IGS05, with 18 IGS05 fiducial stations in the RNAAC SIR region (see Fig. 2a).
4. Time series: The changes of the coordinate solutions between the former and new results are shown by their time series, as an example the time series of station Maracaibo (MARA) demonstrates these differences (Fig. 3). The bold dots represent the time series of the reprocessed data. There are systematic offsets depending on stations antenna type / antenna radome type.
Fig. 2a and 2b show the horizontal and vertical velocities of the solution DGF07P01 compared to the ITRF2005 solution. The agreement of these solutions is quite good, especially the vertical velocities of the Mexican stations are now much more meaningful.
5. Summary and conclusion: So far 168 GPS weeks are reprocessed, and the reprocessing will be continued. The solution DGF07P01 contains 108 stations with estimated velocities. All other stations have less than one year of obser-vations, and therefore have no velocities. The SINEX file of the solution DGF07P01 is available at ftp://ftp.dgfi.badw-muenchen.de/pub/gps/DGF. The next position and velocity solution will be generated in 2008, containing at least all reprocessed GPS weeks since 2000.
Fig. 2b: Verticalvelocities ofRNAAC SIR
stations
Fig. 1: Current IGS RNAACSIR Network
Fig. 2a: Horizontalvelocities ofRNAAC SIRstations
Wolfgang Seemüller1, Manuela Krügel1, Hermann Drewes1, Amir Abolghasem21 Deutsches Geodätisches Forschungsinstitut, München, Germany, [email protected]
2 Ludwig-Maximilians-Universität, München, Germany
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AREQ/ARE2
ASC1
BOGT
BRAZ
CRO1
EISL/ISPA
BRFT
GALA/GLPS
KOUR
LPGS
OHIG/OHI2
SANT
BARB/BDOS
GOUG
VESL
RIOP
INEG
RIOG/RIO2
CORD
UNSA
BRMU
MANA
GUATSSIA
CFAG
CHPI
PARC
(TGCV)
(VALP)
CIC1
SCUB
CONZ
(IQQE)
COPO
ANTC
GOLD
MDO1
PIE1
FORT
ESTI
TEGU/TEG1SLOR
MOIN
MANZ
RCM5/RCM6AOML
MANU
JAMA
CULI
UEPP/PPTE
PARA/UFPR
BOMJ
NAUS
IMPZ
VICO
CUIB
MARA
VBCA
IGM0/IGM1
POAL
RWSN
RECF
SALV
RIOD,ONRJ
CRAT
MPLA
PDES
SMAR
BELE
UBERVARG
MCLA
GVAL
CULC
CAM2COL2CHET
CHI3
LPAZ
HER2
MTY2
TOL2
TAMP
OAX2VIL2
MEXI
MERI
ETCG
MZAC,MZASUNRO
NEIAUBAT
POVE
S061 MAPA
CRCSBANS
UCOR
LHCL
MECO
POLI
PMB1SRNW
SRZN
ANDS
UNSJ
UGTO
BOAV
CEFE
CRUZ
IMBT
MABA
SALU
SAVO/SSA1
SAGA
RIOB
ELENGCGT
CBSB
GRE0
EXU0GTK0
NAS0
SMRT
AUTF
TUCU
PUR3
MIA3KYW1
PALM
APUR GUAY
IGS global stations (55) Stations ceased (11)
Prospective stations Earthquakes with impact
(Stations with brackets: no observations since more than two years)
SIRGAS regional stations (105)
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0˚
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BOGT
RIOP
MARACART
BOGAPERA
CALI
VALL
CUCU
PSTO
MEDE
VIVI
BUCA
BUENNEVA
TUNA
RIOH
YOPADORA
SAMA
IBAG
MOTE
S061
CRCS
BANS
POPATUMA FLOR
ANDS
BERR
BQLA
FQNE
MAGA
CASI
LETI
CANOARCA
GUAV
AGUA
QUIB
Colombia
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0 100 200 3001998
0 100 200 3001999
0 100 200 3002000
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0 100 200 3002007
0
NORTH COMPONENT
EAST COMPONENT
UP COMPONENT
MARACAIBO (MARA)
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-2
0
2
4
cm
860 880 900 920 940 960 980 1000 1020 1040 1060 1080 1100 1120 1140 1160 1180 1200 1220 1240 1260 1280 1300 1320 1340 1360 1380 1400 1420 1440 1460 GPS Week
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4
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8
cm
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cm
3. New coordinate and velocity solution DGF07P01: Combined solutions for estimating the kinematics of the network were performed almost regularly each year in the past. The preliminary realisation for 2007 using the reprocessed
weeks was presented at the AGU Joint Assembly in Acapulco, Mexico, May 2007, in order to analyse the changes produced by the new models. The adjustment of the new DGF07P01 solution is done with the Bernese GPS software 5.0, based on the daily reprocessed normal equation files. The datum realisa-tion is done by positions and velocities of 18 global stations of the IGS05 solution. The positions and velocities of these reference stations were constrained by No Net Rotation (NNR) and No Net Translation (NNT) conditions such that the network optimally refers to the ITRF2005. The reference epoch is the middle of the time intervall, 2004-06-01, 00:00:00.
Fig. 3: Time series of Maracaibo (MARA)
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2 cm/a DGF07P01
IGS Global StationIGS05 Fiducial Station
2 cm/a ITRF2005IGS Regional Station
ASC1
BRAZ
CHPI
CONZ
CRO1
GLPS
LPGS
MANA
OHI2
RIOG
SANT
SCUB
UNSA
VESL
ISPA
GOLD
MDO1
PIE1
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ITRF2005 DGF07P01
1 cm/a