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All quantities such as antenna position, sky position, time, earth orientation parameters, delay and rate should have sufficient precision for VLBI purposes (including Space VLBI), requiring a double in most cases. There should also be ID strings attached to them to specify the coordinate system they refer to. It will be insufficient, for example, to demand that all AIPS++ antenna positions will be IERS XYZs. The VLBA uses USNO terrestrialcelestial frames and EOPs, while the JIVE correlator is likely to use IERS frames. These differences are important for VLBI observing, particularly for astrometricgeodetic experiments.

For Space VLBI it is necessary that AIPS++ supports the motion of an orbiting antenna.

It would be advantageous (and possibly required for use at some correlators) that AIPS++ allows data to be stored in the lag domain.

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2004-08-28