Monte Carlo simulations of the impact of troposphere,clock and measurement errors on the repeatability of VLBI positions |
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Authors: | A Pany J Böhm D MacMillan H Schuh T Nilsson J Wresnik |
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Institution: | 1.Institute of Geodesy and Geophysics,Vienna University of Technology,Vienna,Austria;2.NVI Incorporated,NASA Goddard Space Flight Center,Greenbelt,USA |
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Abstract: | Within the International VLBI Service for Geodesy and Astrometry (IVS) Monte Carlo simulations have been carried out to design
the next generation VLBI system (“VLBI2010”). Simulated VLBI observables were generated taking into account the three most
important stochastic error sources in VLBI, i.e. wet troposphere delay, station clock, and measurement error. Based on realistic
physical properties of the troposphere and clocks we ran simulations to investigate the influence of the troposphere on VLBI
analyses, and to gain information about the role of clock performance and measurement errors of the receiving system in the
process of reaching VLBI2010’s goal of mm position accuracy on a global scale. Our simulations confirm that the wet troposphere
delay is the most important of these three error sources. We did not observe significant improvement of geodetic parameters
if the clocks were simulated with an Allan standard deviation better than 1 × 10−14 at 50 min and found the impact of measurement errors to be relatively small compared with the impact of the troposphere.
Along with simulations to test different network sizes, scheduling strategies, and antenna slew rates these studies were used
as a basis for the definition and specification of VLBI2010 antennas and recording system and might also be an example for
other space geodetic techniques. |
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