Space VLBI Technique
Space VLBI is a technique of Very Long Baseline Interferometry (VLBI)
that is used to extend the baseline length and improve the angular
resolution compared to ground-based VLBI. The resolution of the
technique is sub-milliarcsecond at wavelengths of a few cm, and can
be better than 100 microarcseconds at wavelengths of 1 cm and shorter.
Radio interferometry is carried out by using a space-based radio telescope
as one element of an array together with a set of ground-based radio
telescopes. For an imaging interferometer, the space radio telescope
generally is in a highly elliptical orbit and moves fairly rapidly,
enabling synthesis of a large imaging aperture in a typical observing
time of about 12 hours. Typically, the observations require one or
more science telemetry stations that supply a highly accurate clock
to the spacecraft as well as recording the wideband VLBI data for
later processing at a special-purpose VLBI correlator.
Last modified on
Tuesday, 17-Feb-2009 11:55:53 MST
Hosted by NRAO on behalf of the US VSOP-2 Science Team.