[Lofarpwg] PPF for LOFAR

[Evan Keane]

Hi folks,

Woah - thanks for the numerous helpful responses! I will contact those
people suggested.

"you need all the subbands to go back"

Ah yes, 488 is not 512 ...

Thanks again!
Evan


Ar Déar 11 Meith 2020 ag 09:08, scríobh Joeri van Leeuwen <leeuwen at astron.nl
>:

>
> Hi Evan, all,
>
> Apertif uses the same PFB and there too Eric Kooistra and I looked into
> it. The filterbank is critically sampled as Ben writes, which is an issue.
> One more problem (depending on the stage at which you want to the
> inversion) as that you need all the subbands to go back, so after subband
> selection you have an information deficit. Eric most likely has a Matlab
> model.
>
> Cheers,
> Joeri
>
> ==
>
>
> On 11-6-2020 09:57, Benjamin Stappers wrote:
>
> Hi Evan,
>
> I don’t have anything quickly to hand, but I can take a look. On the
> inversion,
> we looked into some of this a long time back for the Cosmic Ray work and
> I believe that there was a student, I could find out her name and details
> who
> worked on that. However, my memory is such that while it is possible in
> theory
> it isn’t actually possible unless you do a oversampled polyphase like the
> ASKAP
> one and the one proposed for SKA-Low.
>
> Cheers - Ben
>
>
> On 11 Jun 2020, at 08:52, Evan Keane <evan.keane at gmail.com> wrote:
>
> Hi PWG,
>
> Does anyone have to hand a paper/document/anything describing the LOFAR
> polyphase filterbank in the RSP boards, or a model for them? The kind of
> thing I could run on (say) some simulated Nyquist voltages to get a LOFAR
> RSP like response? And, related, any attempts to invert the polyphase
> filterbank?
>
> Evan
>
> --
> Is mise le meas,
> Dr. E. F. Keane
>
> **Smaoinigh ar an timpeallacht - an gcaithfidh tú an r-phost seo a
> phriontáil?**
> **Please consider the environment before printing this email**
> _______________________________________________
> lofarpwg mailing list
> lofarpwg at astron.nl
> http://mailman.astron.nl/listinfo/lofarpwg
>
>
> ***************************************************************
> Ben Stappers
> Head of Pulsar and Time Domain Astronomy Group
> MeerTRAP Project Lead
> Jodrell Bank Centre for Astrophysics
> Department of Physics and Astronomy
> The University of Manchester
> Phone: +44 161 2754187
> ***************************************************************
>
>
>
>
>
>
>
>
> _______________________________________________
> lofarpwg mailing listlofarpwg at astron.nlhttp://mailman.astron.nl/listinfo/lofarpwg
>
>
>

-- 
Is mise le meas,
Dr. E. F. Keane

**Smaoinigh ar an timpeallacht - an gcaithfidh tú an r-phost seo a
phriontáil?**
**Please consider the environment before printing this email**
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.astron.nl/pipermail/lofarpwg/attachments/20200611/d4af0cbd/attachment.html>