[mmaimcal]Re: [Almasci] Antenna Acceleration

[Robert Laing]

Quoting Tetsuo Hasegawa <tetsuo.hasegawa at nao.ac.jp>:


> This may require a change in the antenna specification.  We certainly 
> need a help by specialists.
>

Could I ask whether there is a servo simulation of even a generic ALMA antenna
available for us to look at, or is what has been done strictly confidential? I
have been involved in similar discussions on servo performance of optical
telescopes, and it is usual to set up a model including the digital and analogue
servo loops and a reasonably realistic model of the dynamic response at least of
the axis in question, if not of the whole telescope (there are many packages
around which do this - servo engineers I've worked with in the past have used
Simulink). I think that this is the only way to get a quantitative answer to
questions about positional accuracy during fast scans.

Regards

Robert 


-- 
Robert Laing, European ALMA Instrument Scientist
ESO, Karl-Schwarzschild-Strasse 2, D-85748 Garching-bei-Munchen Germany
+49 (0)89 3200 6625                      rlaing at eso.org