About IVS

About VLBI

This page provides links to basic information about VLBI, its history, geodetic VLBI, and other topics related to IVS. VLBI is a geometric technique: it measures the time difference between the arrival at two Earth-based antennas of a radio wavefront emitted by a distant quasar. In the VLBI concept of the near future broad-spectrum is recorded at radio telescopes and transmitteed via high speed data links to a correlator.

If you know about or would like to contribute a link to this page please contact the Coordinating Center.

• Wayne Cannon's overview of VLBI and reference frames, from the IVS Annual Report (1999)
• Principles of radio interferometry, by the Canadian VLBI correlator group (1999)
• NASA-GSFC's Geodetic VLBI Program: A Twenty-Year Retrospective by J. W. Ryan and C. Ma (1998)
• NRAO's book on VLBI and the VLBA from a Summer School course (1993)
• Introduction to Radio Interferometry (NRAO NAASC Workshop) (2015)