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Article Contents

ABSTRACT

1.INTRODUCTION
1.1.History
1.2.Radio Astrometry

2.ASTROPHYSICAL APPLICATIONS
2.1.Galactic Structure
2.2.Star Formation
2.3.Asymptotic Giant Branch Stars
2.4.X-ray Binaries
2.5.Pulsars
2.6.Radio Stars
2.7.Star Clusters
2.8.Sgr A*
2.9.Megamasers and the Hubble Constant
2.10.Extragalactic Proper Motions
2.11.Tests of General Relativity
2.12.Extrasolar Planets and Brown Dwarfs
2.13.AGN Cores
2.14.Satellite Tracking

3.ARRAYS FOR RADIO ASTROMETRY

4.FUNDAMENTALS OF RADIO ASTROMETRY
4.1.Relative Astrometry
4.2.Sources of Delay Error
4.3.Observing methods

5.ADVANCED TECHNIQUES
5.1.Tropospheric Delay Calibration
5.2.Ionospheric Delay Calibration
5.3.Dual-beam Systems
5.4.Reference Source Position
5.5.Source Elevation Limits
5.6.Measuring Positions

6.FUTURE
6.1.Space VLBI
6.2.The Event Horizon Telescope
6.3.Square Kilometer Array

REFERENCES