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Re: [Discuss-gnuradio] software controlled antenna
From: |
Eric Blossom |
Subject: |
Re: [Discuss-gnuradio] software controlled antenna |
Date: |
Tue, 20 Dec 2005 13:30:54 -0800 |
User-agent: |
Mutt/1.5.6i |
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
Re: [Discuss-gnuradio] software controlled antenna, Eric Blossom, 2005/12/20