[Lofarpwg] PPF for LOFAR

[Joeri van Leeuwen]

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 
>> <mailto: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
>>
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>
> ***************************************************************
> 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
> ***************************************************************
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