Jim:
We can do this right now with a software receiver. We need to make the
oscillators coherent in the same way we have done (in software). So
this will be usable by SDR-1000 and Flex3000 owners. Good idea.
I do not agree that the algorithm you suggest is the correct one but it
will be the first one because it is easy. It will be applicable to HF
broadcast very quickly.
The algorithms based on MUSIC and ESPRIT are better suited, especially
to the typical amateur installation where the elements are not identical
and not spaced the correct distance apart.
http://eprints.eemcs.utwente.nl/15144/01/final_report_Jasper_Vrielink.pdf
http://www.springerlink.com/content/y8001q047g520398/
These algorithms allow for much more than two elements and are pretty
efficient when only two elements are involved.
My work partners and I are running a phased array with SDR design
contract with a well known (not Flex) SDR hardware manufacturer and
these algorithms will be part of the adaptive phased array work that
must be done. Again, open source will benefit all.
Happy Cinco de Mayo to all!
http://twitpic.com/4mqnv
We are about to embark on some SERIOUS adaptive algorithm development
with DttSP, Flex, Gnuradio, etc. all involved. All of us will benefit.
Jim Barber wrote:
Not being familiar with the architecture or sources, would there be
any value in developing a 2-input, LMS-style noise reduction scheme
using the same antenna for both receivers and a small frequency
offset? (RX2 would be tuned to an unoccupied "noise" frequency as
close as possible to the "active" RX1 operating frequency)
That technique has been successfully used elsewhere and has the
advantage of adaptively canceling any static or long-term difference
in "phase" between the signals. (primarily group delay in this case?).
The obvious disadvantage is having to choose a suitable noise
frequency on a busy band, assuming one is available.
Thoughts?
Thanks,
Jim Barber, N7CXI
--
(Co)Author: DttSP, Quiktrak, PowerSDR, GnuRadio
Member: ARRL, AMSAT, AMSAT-DL, TAPR, Packrats,
NJQRP, QRP ARCI, QCWA, FRC.
"You don't need to see the whole staircase, just
take the first step.", MLK.
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