Arnold, Daniel

Brockmann, Elmar

Dach, Rolf

Jäggi, Adrian

Kalarus, Maciej

Prange, Lars

Schaer, Stefan

Stebler, Pascal

English

Bern Open Repository and Information System (BORIS)

Review the IGS Strategy forPrecise Point Positioning ApplicationsRolf Dach, Daniel Arnold, Elmar Brockmann, Maciej Kalarus,Lars Prange, Stefan Schaer, Pascal Stebler, Adrian JäggiAstronomical Institute, University of Bern, SwitzerlandEGU General Assembly 202414–19. April 2024, Vienna AustriaAstronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaThe clear theorySomething unexpectedExplanation for the surpriseSlide 2 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaIllustration of the problembRSlide 3 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaIllustration of the problembRX YZOriginSlide 3 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaIllustration of the problembRX YZCoFSlide 3 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaIllustration of the problembRX YZCoFSlide 3 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaIllustration of the problembSbRX YZCoFSlide 3 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaIllustration of the problembSbRX YZCoFSlide 3 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaIllustration of the problembSbRX YZCoFCoMSlide 3 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaIllustration of the problembSbRX YZCoFCoMSlide 3 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaWhich reference frames are needed for which purpose?GNSS station: ITRF (CF-based)• Earth fixed system with stable origin in timeSatellite positions (for interpolation): ITRF (CF-based)• the same frame as the GNSS stations (for user’s convenience)• realized today in the SP3 orbit product filesSatellite orbits (for orbit modelling): GCRF (CM-based)• Earth centered system that does not participate in the Earth rotation• instantaneous center of mass as the originWe just need a well established ITRF;GCRF is only needed temporally during the data analysis.Slide 4 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaThe experiment setupGalileo GLONASS GPSNetwork of 120 IGS stations as used by CODE rapid solution.Slide 5 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaThe experiment setupFollowing the CODE processing scheme for the IGS rapid solution:Slide 6 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaThe experiment setupFollowing the CODE processing scheme for the IGS rapid solution:• one-day orbit solution• day 179 to 190 of year 2023• ambiguities resolvedSlide 6 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaThe experiment setupFollowing the CODE processing scheme for the IGS rapid solution:• one-day orbit solution• day 179 to 190 of year 2023• ambiguities resolved• three one-day solutions are connected to a long-arc solution• day 180 to 189 of year 2023• extraction of the middle day• datum definition: NNR+NNT condition on a verified set of stations in IGS20 frameSlide 6 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaThe experiment setupFollowing the CODE processing scheme for the IGS rapid solution:• one-day orbit solution• day 179 to 190 of year 2023• ambiguities resolved• three one-day solutions are connected to a long-arc solution• day 180 to 189 of year 2023• extraction of the middle day• datum definition: NNR+NNT condition on a verified set of stations in IGS20 frame• back substitution of the receiver and satellite clock parameter• day 180 to 189 of year 2023• geometry from the three-day long-arc solution is introducedSlide 6 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaThe experiment setup: Solution CoFbbX YZCoFSlide 7 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaThe experiment setup: Solution CoMbbX YZCoFCoMSlide 7 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaComparing the CoF- and CoM-based solutionsStation coordinates (in IGS20 frame):• no significant transformation parameters• agreement: RMS of differences (without transformation parameters) < 0.5mmSlide 8 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaComparing the CoF- and CoM-based solutionsStation coordinates (in IGS20 frame):• no significant transformation parameters• agreement: RMS of differences (without transformation parameters) < 0.5mmSatellite positions (in IGS20 frame):• no significant transformation parameters• agreement: RMS of differences (without transformation parameters) < 1mm• exception for satellites with repositioning event or short observed intervalSlide 8 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaComparing the CoF- and CoM-based solutionsStation coordinates (in IGS20 frame):• no significant transformation parameters• agreement: RMS of differences (without transformation parameters) < 0.5mmSatellite positions (in IGS20 frame):• no significant transformation parameters• agreement: RMS of differences (without transformation parameters) < 1mm• exception for satellites with repositioning event or short observed intervalSatellite positions (in GCRF incl. geocenter vector):• agreement: RMS of differences (with transformation parameters) ≈ 5 . . . 7mmSlide 8 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaComparing the CoF- and CoM-based solutions−0.50.00.5ΔXΔinΔmmTran lationΔparameter ΔfromΔorbitΔcompari onΔinΔBCRF0.10.20.3ΔYΔinΔmm29 01Jul20230830 02 03 04 05 06 07Epoch2.02.22.4ΔZΔinΔmmSlide 9 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaComparing the CoF- and CoM-based solutions−0.50.00.5ΔXΔinΔmmTran lationΔparameter ΔfromΔorbitΔcompari onΔinΔBCRF0.10.20.3ΔYΔinΔmm29 01Jul20230830 02 03 04 05 06 07Epoch2.02.22.4ΔZΔinΔmmGeocenter correction applied:• X-component: 0.5mm• Y-component: 3.2mm• Z-component: 3.2mmGeocenter motion model from ITRF2020https://itrf.ign.fr/ftp/pub/itrf/itrf2020/. . .ITRF2020-geocenter-motion.datSlide 9 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaComparing the obtained satellite clock corrections2023-06-292023-06-302023-07-012023-07-022023-07-032023-07-042023-07-052023-07-062023-07-072023-07-082023-07-09Epochs−0.3−0.2−0.10.00.10.20.3Clock diffe ences in nsRefe ence clock WTZZGalileo E07 Galileo E08CoM-based solutionSlide 10 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaComparing the obtained satellite clock corrections2023-06-292023-06-302023-07-012023-07-022023-07-032023-07-042023-07-052023-07-062023-07-072023-07-082023-07-09Epochs−0.3−0.2−0.10.00.10.20.3Clock diffe ences in nsRefe ence clock WTZZGalileo E07 Galileo E08CoF-based solutionSlide 10 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaComparing the obtained satellite clock corrections2023-06-292023-06-302023-07-012023-07-022023-07-032023-07-042023-07-052023-07-062023-07-072023-07-082023-07-09Epochs−0.02−0.010.000.010.02Clock diffe ences in nsRefe ence clock WTZZGalileo E07 Galileo E08Difference between CoF−CoM-based solutionsSlide 10 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaComparing the obtained satellite clock corrections2023-06-292023-06-302023-07-012023-07-022023-07-032023-07-042023-07-052023-07-062023-07-072023-07-082023-07-09Epochs−0.02−0.010.000.010.02Clock diffe ences in nsRefe ence clock WTZZGalileo E07 Galileo E08 Galileo E09 Galileo E04Difference between CoF−CoM-based solutionSlide 10 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaSatellite clock corrections do absorb the Geocenter correctionFrom the satellite clock differencesthe related geocenter vector is extracted:• X-component: 0.7mm• Y-component: 3.5mm• Z-component: 2.6mmGeocenter correction applied:• X-component: 0.5mm• Y-component: 3.2mm• Z-component: 3.2mmGeocenter motion model from ITRF2020https://itrf.ign.fr/ftp/pub/itrf/itrf2020/. . .ITRF2020-geocenter-motion.datSlide 11 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaSatellite clock corrections do absorb the Geocenter correction012GCC(X) in mmGeocenter vector estimated from the clock differencesGPS GLO GAL34GCC(Y) in mm29 01Jul20230830 02 03 04 05 06 07Epoch23GCC(Z) in mmGeocenter correction applied:• X-component: 0.5mm• Y-component: 3.2mm• Z-component: 3.2mmGeocenter motion model from ITRF2020https://itrf.ign.fr/ftp/pub/itrf/itrf2020/. . .ITRF2020-geocenter-motion.datSlide 11 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaConclusions• If a center of mass correction for the Geocenter vector introduced in the GNSS orbitdetermination it is completely absorbed by the co-estimated satellite clockcorrections.Slide 12 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaConclusions• If a center of mass correction for the Geocenter vector introduced in the GNSS orbitdetermination it is completely absorbed by the co-estimated satellite clockcorrections.• The orbits realize a center of mass system in the GCRF independent from introducedvector.Slide 12 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaConclusions• If a center of mass correction for the Geocenter vector introduced in the GNSS orbitdetermination it is completely absorbed by the co-estimated satellite clockcorrections.• The orbits realize a center of mass system in the GCRF independent from introducedvector.• For PPP one has to be careful regarding the consistency.Slide 12 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaConclusions• If a center of mass correction for the Geocenter vector introduced in the GNSS orbitdetermination it is completely absorbed by the co-estimated satellite clockcorrections.• The orbits realize a center of mass system in the GCRF independent from introducedvector. GCRF is just a temporary frame realized during the data processing.• For PPP one has to be careful regarding the consistency.• Any PPP solution has to end up in the ITRF (CF-based frame).Slide 12 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaIGS Workshop 2004❈ ❊   ❊ ✁ ✂ ✄ ☎ ✆ ✝ ✞ ✄ ❉ ❊ ✟ ✄ ✠ ❊❖ ✡ ☎ ❚ ❊ ■ ✝ ☎ ❊ ✂ ✝ ✄ ☎ ✆ ❖ ✝ ✄   ● ☛ ☞ ☞ ❊ ✂ ✌ ✆ ✟ ❊❲✍✎✏✑✒✍✓ ✫ ✔❨✕✓✍✑✖✗✕ ✷✘✘✙❆✚✛✜✢✣✢✤✥✦✧★ ✩✣✚✛✥✛✪✛✬❯✣✥✭✬✜✚✥✛✮ ✢♦ ❇✬✜✣✬❇✬✜✣✬✯ ❙✰✥✛✱✬✜★✧✣✲▼✳ ▼✬✥✣✲★✯ ✴✲✥✛✢✜P✵✶✸✹✹✺✻✼✽✾✿✹✵✼✹❀ ❁❂✻❃❄✹✵❅❋✼✺❍❋✵✸❏ ❑▲◆❀ ◗❘❘❱Recommendations:• All IGS satellite clocks should be in ITRF center ofnetwork. . . .extract from Recommendation 2.10 – IGS Reference Frame Maintenance• The PPP realization of ITRF using IGS products . . .extract from Recommendation 2.11 – IGS Reference Frame MaintenanceSlide 13 of 14 Astronomical Institute, University of Bern AIUBR.DachandCODEACteam:ReviewtheIGSStrategyforPPPApplicationsEGUGeneralAssembly2024;14–19.April2024,ViennaAustriaTHANK YOUfor your attentionPublications of the satellite geodesy research group:http://www.bernese.unibe.ch/publistSlide 14 of 14 Astronomical Institute, University of Bern AIUB

Review the IGS Strategy for PPP Applications

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Review the IGS Strategy for PPP Applications

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