shipvef.blogg.se - Daniel webber 716

"The VLBA Calibrator Survey-VCS1."Īstrophysical Journal, Supplement Series, "The Second VLBA Calibrator Survey: VCS2."īeasley, A., D. "Monitoring the TOPEX and Jason-1 Microwave Radiometers with GPS and VLBI Wet Zenith Path Delays."įomalont, E. "The Second Extension of the International Celestial Reference Frame: ICRF-EXT.1." "Radio source instability in VLBI analysis."įey, A., C. "Combination of long time-series of troposphere zenith delays observed by VLBI." "The kinematics of Ny-Alesund from space geodetic data." "Precise geodesy with the Very Long Baseline Array." International VLBI Service for Geodesy and Astrometry, 2010 General Meeting Proceedings NASA CP/2010-215864: Greenbelt, Maryland, U.S.A.:, "Coordinating, Scheduling, Processing and Analyzing IYA09." "VLBI-derived troposphere parameters during CONT08." International Association of Geodesy Symposia, "IAG Symposium on Reference Frames for Applications in Geosciences (REFAG)", Marne-la-Vallée, France, Oct: 4-8, 2010, REFERENCE FRAMES FOR APPLICATIONS IN GEOSCIENCES, "Effects of ICRF2 on the TRF, CRF, and EOP." "Comparison of Realizations of the Terrestrial Reference Frame." "The Construction of ICRF2 and Its Impact on the Terrestrial Reference Frame." "External Evaluation of the Terrestrial Reference Frame: Report of the Task Force of the IAG Sub-commission 1.2."Įarth on the Edge: Science for a Sustainable Planet, International Association of Geodesy Symposia,Ĭollilieux, X., Z. International Association of Geodesy Symposia, "Earth on the Edge: Science for a Sustainable Planet", Melbourne, Australia, June 28 - July 2, 2011, "Quantifying the Correlation Between the MEI and LOD Variations by Decomposing LOD with Singular Spectrum Analysis." "Continental hydrology loading observed by VLBI measurements." Journal of Geophysical Research: Solid Earth,Įriksson, D., and D.

"Tropospheric delay ray tracing applied in VLBI analysis." "The Second Realization of the International Celestial Reference Frame by Very Long Baseline Interferometry."Įriksson, D., D.

"EOP and scale from continuous VLBI observing: CONT campaigns to future VGOS networks."įey, A. "Galactocentric acceleration in VLBI analysis." "Modernizing and expanding the NASA Space Geodesy Network to meet future geodetic requirements." "Comparison of EOP and scale parameters estimated from the three simultaneous CONT17 VLBI observing networks."

IVS VGOS Technical Committee (previously IVS VLBI2010 Committee).

IAG Working Group 1.4.2 Impact of geophysical andĪstronomical modeling on reference frames and their consistency.

IVS Working Group 8 Galactic aberration.

He has analyzed effects of multipath signal scattering on GPS measurements and tested methods of mitigating the problem. This work consists of using GPS and VLBI tropospheric delay estimates to calibrate altimeter microwave radiometer drifts. He directs the task on improving the VLBI analysis technique. He was a principal investigator on the Jason altimeter science working team. He demonstrated the importance of modeling the azimuthal dependence of tropospheric delay in geodetic analysis and in the determination of the terrestrial and celestial reference frames from VLBI measurements. Additionally he has investigated many other systematic errors in VLBI measurements including extragalactic radio source apparent proper motion, atmospheric pressure loading, ocean loading, hydrology loading, antenna feed polarization leakage, and antenna thermal deformation. He has been responsible for improvements in VLBI tropospheric delay modeling. He was a major contributor to the development of the 2nd Realization of the International Celestial Reference Frame by Very Long Baseline Interferometry recently adopted by the International Astronomical Union. He applied Monte-Carlo simulations with realistic models of clock drifts and atmospheric turbulence to determine realistic error sources in VLBI. As member of the IVS Working Group 3, he used simulations to determine the specifications for the next generation VLBI2010 antennas.