[daip] DTSIM - AIPS

[Leonia Kogan]

Dear Alessandra,

I have returned back from vacation today. So it is a case when it'd be 
better to send the message to
daip at nrao.edu
DTSIM is not the deeply tested task. I looked briefly to the help file 
and found it too complicate.
I can not say anything now about the 'feature".

I have written another simulated task UVCON which does not simulate 
D-term but does Gaussian noise.
UVCON  simulates the observation of one source at one frequency allowing 
simulation for any configurations including VLA, VLBA and many other 
options.

So we need to decide what is better/simpler:
1. to add noise to DTSIM (it may be simpler)
2. to add D-term simulation to UVCON (it may be more complicate and no 
IFs, ....)

Let us (AIPS group) to discuss this at the AIPS meeting this Wednesday.

Leonia


Alessandra Bertarini wrote:
> Hello Leonia,
>
>  I am trying to estimate the error on the D-term calculation on my VLBI
>  dataset and I was thinking to use DTSIM to simulate a UVData set since, to
>  my understanding, DTSIM is the only AIPS simulation task allowing for
>  D-terms.
>
>  Is there any way to add gaussian noise to the simulated set?
>
>  Btw, there might be a "feature" in DTSIM: I have generated a 1.6 Jy
>  unpolarized point source with D-terms causing flux in RL and LR using
>  three IFs. In IF1 everything looks reasonable (RL and LR are as expected,
>  apart from the absence of noise), but in IF2 and IF3 they are set to
>  zeros for the whole array. Is that "feature" expected or is it a bug?
>  Feel free to pass this e-mail to the "designated aip" :).
>
>  Thanks in advance.
>
>  Regards,
>  Alessandra
>