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[Discuss-gnuradio] Re: Pulse-doppler RADAR wind profiler project and how

From: Nick Withers
Subject: [Discuss-gnuradio] Re: Pulse-doppler RADAR wind profiler project and how to bypass interpolation, DAC filtering, etc.
Date: Mon, 23 Feb 2009 19:43:08 +1100

Just resending as this didn't seem to get through to the list...

Presumably I must be subscribed to post?

On Tue, 2009-02-17 at 20:37 +1100, Nick Withers wrote:
> Hi all,
> I'm new to GNURadio / the USRP, but am working on a project, as part of
> my honours for a Bachelor of Engineering degree, to implement a
> pulse-doppler RADAR wind profiler (some information at
> http://nickwithers.com/usrp-wind-profiler).
> If anyone's interested, perhaps doing something similar, or with tips
> they can offer off the top of their noggin I'd love to hear from you :-)
> I'm basing my work off Johnathan Corgan's radar-mono code (thanks
> Johnathan!) and have a couple of questions I was hoping someone could
> point me in the right direction with (dare say I'll be getting referred
> straight to the FAQ, it's all a bit overwhelming!).
> I want, if possible, to bypass the DAC's interpolation, filtering etc.
> (the chief reason being to avoid the 44 MHz upper-bound on signals I can
> output from it (I'm using the Basic{T|R}X boards and aiming to work
> around 70 MHz), see http://www.gnuradio.org/trac/wiki/UsrpFAQ/DUC
> (incidentally, I've done a crap job of finding supporting information in
> the AD9862 data sheet)). Do I need to rewrite the C++ code (e.g.,
> usrp/host/lib/legacy/usrp_standard.cc) if I want to continue to use
> usrp_source_?() / usrp_sink_?() and such from Python? Any tips on how I
> go about doing it? Can / should I just rewrite the DAC configuration
> from within the FPGA when it's initialised?
> Any tips appreciated!
Nick Withers
email: address@hidden
Web: http://www.nickwithers.com
Mobile: +61 414 397 446

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