If you don't know the relative phase of your two receiver chains, how are you going to
know the direction of a signal?
On 01.09.23 17:37, Michael Berman wrote:
Marcus,
Thanks for the reply! I apologize, the GR package is gr-aoa, not gr-music, and can be
found here (https://github.com/MarcinWachowiak/gr-aoa). The NOAA broadcast is a NBFM
signal. I am using 2 Signal Hound receivers (https://signalhound.com/products/bb60c/)
with 2 antennas spaced on a beam. Do I need to synchronize the 2 receivers with an
external clock, or should they be fine free running independently?
Thank you very much,
Michael Berman
On Fri, Sep 1, 2023 at 9:25 AM Marcus Müller <mmuel...@gnuradio.org> wrote:
Not familiar with the details of NOAA signalling, but isn't the carrier of
an FM signal
*the FM signal*?
For a DoA estimate, you'd correlate the different receive chains with each
other to
get a
phase; so, as long as the signals do have some bandwidth that makes the
problem less
ambiguous, it'd work with any signal. I'm sadly not familiar with gr-music
(and
can't find
it on cgran.org <http://cgran.org>), but MUSIC works as long as the signals
at the
different receive antennas
are correlated and noise is not. You do not have to preprocess your FM
signal!
Best,
Marcus
On 01.09.23 17:09, Michael Berman wrote:
> Does anybody know if there is a way to recover a carrier of an FM signal
to use
for an
> Angle of Arrival calculation? I am using GNURadio and gr-music and I am
trying to
use the
> NOAA Weather Radio signals.
>
> Thank you very much,
>
> Michael Berman
