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Re: [Discuss-gnuradio] software controlled antenna
From: |
Angilberto Muniz Sb |
Subject: |
Re: [Discuss-gnuradio] software controlled antenna |
Date: |
Tue, 20 Dec 2005 19:02:54 -0800 (PST) |
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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Re: [Discuss-gnuradio] software controlled antenna, Eric Blossom, 2005/12/20