An accuracy assessment of Magellan Very Long Baseline Interferometry (VLBI)

Details An accuracy assessment of Magellan Very Long Baseline Interferometry (VLBI) An accuracy assessment of Magellan Very Long Baseline Interferometry (VLBI)

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990fmet.symp..115e&link_type=abstract

In NASA, Goddard Space Flight Center, Flight Mechanics/Estimation Theory Symposium, 1990 p 115-132 (SEE N91-17073 09-13)

Computer Science

Accuracy, Angular Velocity, Calibrating, Data Acquisition, Position (Location), Very Long Base Interferometry, Charged Particles, Data Reduction, Earth Rotation, Ephemerides, High Frequencies, Superhigh Frequencies, Tides, Tracking Stations, Velocity Measurement, Venus (Planet)

Scientific paper

Very Long Baseline Interferometry (VLBI) measurements of the Magellan spacecraft's angular position and velocity were made during July through September, 1989, during the spacecraft's heliocentric flight to Venus. The purpose of this data acquisition and reduction was to verify this data type for operational use before Magellan is inserted into Venus orbit, in August, 1990. The accuracy of these measurements are shown to be within 20 nanoradians in angular position, and within 5 picoradians/sec in angular velocity. The media effects and their calibrations are quantified; the wet fluctuating troposphere is the dominant source of measurement error for angular velocity. The charged particle effect is completely calibrated with S- and X-Band dual-frequency calibrations. Increasing the accuracy of the Earth platform model parameters, by using VLBI-derived tracking station locations consistent with the planetary ephemeris frame, and by including high frequency Earth tidal terms in the Earth rotation model, add a few nanoradians improvement to the angular position measurements. Angular velocity measurements were insensitive to these Earth platform modelling improvements.

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