Re: [Discuss-gnuradio] software controlled antenna

[Angilberto Muniz Sb]

Thats the path I'm on, Eric.

I've done simulations in Simulink and tested the
concept in FPGA with two differente views:

1 - 100% analytical (no manipulation of any phisical
caracteristics of the IF signal)
2 - Changing the phase of LO (NCO) according to some
cost function.

It seems to work...(its not real-time, but works)

Angilberto.

--- Eric Blossom <address@hidden> wrote:

> On Tue, Dec 20, 2005 at 03:30:56PM -0500, Marcus
> Leech wrote:
> 
> > Paul Shuch was working on a phased-array panel
> antenna for
> >  SETI work.  I don't know how many elements, but
> it was
> >  steered using varactors.  For some environments,
> this would
> >  be really nice--no need to build mechanicals to
> swing a dish
> >  around.
> > 
> > On the down side, a phased-array patch antenna is
> potentially a lossy
> >  thing, so useless for weak-signal work like EME
> and radio astronomy.
> >  Unless you have an LNA at every element in the
> array.  Which maps into
> >  $$$.
> 
> For narrow-band arrays (bandwidth < 1% of center
> freq), we think we
> can steer the array with DSP in the FPGA and/or
> host.  This would
> allow us to build 4 antenna arrays with a single
> USRP.
> 
> Good introductory textbook: "Adaptive Array
> Systems", Allen & Ghavami,
> ISBN 0-470-86189-4
> 
> Eric
> 


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