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RE: starship-design: Massively Distributed Computing for SETI
> From firstname.lastname@example.org Sun Mar 18 17:16:34 2001
> From: "L. Parker" <email@example.com>
> > E.g., a 100-kilometer diameter microvawe dish
> > tilted by only 1 mm (1/25th of an inch) at the edge, sweeps the beam
> > at 1 ly distance by 100 000 (one HUNDRED thousand) kilometers!
> > (i.e., almost one-third of the Earth-Moon distance)
> > I am afraid that such deflections are easily obtainable
> > by heat distortions of the structure or gravitational perturbation
> > from an asteroid flying some million kilometers away...
> Well it is obvious from what you just presented that a dish is out of the
> question. A phased array however is quite a different matter.
> Assuming that we are looking at a microwave beam as opposed to a laser,
> then we would only have to electronically steer the beam to correct for
> movement - as well as heat distortions, gravitational perturbations, etc.,
> which also implies some sort of feedback loop to measure such things.
Which seems also a quite nontrivial task, as the accuracies
must be very high, and the phased array will probably have
to be quite huge...
-- Zenon Kulpa