Precision of vertical position estimates from Very Long Baseline Interferometry
作者： T. A. Herring
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摘要: We discuss the prospects for using very long baseline interferometry (VLBI) to measure vertical crustal motions. Our analysis of this problem indicates that main limitations such VLBI measurements will probably arise from errors in modeling propagation delay through earth's neutral atmosphere and determining orientation a “crust fixed” coordinate system (inertial) reference frame. examine two techniques assessing precision position which can be made with currently available systems: (1) repeatability length measurements, (2) site one four-site network when positions other three sites determine earth parameters. The implies estimates is ∼8 cm, averaged over 13 (separated by 600–8000 km) 4.5 years data. Richmond, Florida, ∼7 cm 42 observing sessions carried out during an 11-month period. Both we have used estimate height determinations indicate current single 24-hour session. effects parameters depend on distances between could induce as large given above.
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