[daip] Re: large-N arrays

[Leonia Kogan]

Tim,

Use the AIPS task 'UVCON' for simulation. UVCON has some nice features,
including different coordinate system for the array antennas and possibility 
of using model at orbitrary position on the sky. The model can be put at 
any point of the sky under control of the parameters.
UVCON has the upper limit of the antenna number 2000.

IMAGR (fortunately is not sencitive to the number of
antennas(baselines).  So You can use IMAGR to evaluate synthesize beam
for example and the restored image of cource.

Any question about UVCON is welcomed.

Leonia
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>From egreisen at cv3.cv.nrao.edu Tue Apr 30 08:31 MDT 2002
Date: Tue, 30 Apr 2002 08:31:58 -0600
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From: Eric Greisen <egreisen at cv3.cv.nrao.edu>
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To: "Tim Bastian (CV)" <tbastian at cv3.cv.nrao.edu>
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Subject: Re: large-N arrays
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Tim Bastian (CV) writes:
 > Hi Eric,
 > 
 > How are large-N arrays handled in AIPS these days? Some years ago, you 
 > bumped up the number of antennas handled by AIPS from 50 to 90 so that 
 > I could run the 84 element Nobeyama radioheliograph through AIPS. I'd like 
 > to do simulations involving as many as 2-300 antennas. In looking at UVSIM 
 > I see that NMAX is set to 100 and could be larger but that MAXANT is still
 > 90 in the relevant include file. I assume that this means that most AIPS
 > tasks won't handle more than 90 antennas properly.

Correect.  I will forward this to Leonia who has done a lot of
simulation and array design work including for SKA (2000 antennas or
so).  He may have some suggestions.

ERic




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