I'm currently doing some preliminary planning/budgeting for a
significant project involving Gnu Radio:
http://tech.groups.yahoo.com/group/sbrac-astronomy/
My current thinking is to run dual polarization at the feedpoint, using
USRP2. The idea is that two USRP2s
can live in a weatherproof enclosure at the feed, providing signals
over GiGE to a pair of happy CPUs in the
control room. Still lots of unknowns, but I want to know what I
should aim for when I go seeking funding.
I'm thinking that with quad-core systems becoming cheaper, perhaps a
pair of quad-core signal processing
engines (Q6600 or better), along with perhaps 2-4GB of memory on each
system.
Right now, I'm getting by with a Pentium D 925 doing just fine with 8Mhz
input bandwidth driving
a sampled spectral display, and a total power display. I wonder at
what point the Gnu Radio stack
will grow serious multi-threading capability (particularly in blocks
like filters and FFTs), making multi-CPU
systems a real bonus.
I think I recall that the re-write of the signal chain "plumbing" was
partially to make multi-threading easier,
yes?
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