[Lofarpwg] PPF for LOFAR

[Sander ter Veen]

Hi Evan,

The initial inversion work is published in:

https://ui.adsabs.harvard.edu/abs/2012NIMPA.664..171S/abstract

The group now use an updated algorithm and have implemented this on DRAGNET. There is indeed a solution that is not unique. You can contact Stijn Buitink for the details.

kind regards,

Sander


> On 11 Jun 2020, at 10:41, Cees Bassa <bassa at astron.nl> wrote:
> 
> Hi Evan,
> 
> On Thu, 2020-06-11 at 08:52 +0100, Evan Keane 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?
> 
> I believe the taps of the station based PFB are defined in:
> https://git.astron.nl/ro/lofar/-/blob/master/RTCP/Cobalt/GPUProc/src/BandPass.cc
> 
> Here, they are used to correct the bandpass for the bandpass ripple.
> 
> Regards,
>   Cees
> 
> 
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