In sci.physics John Larkin wrote:
On Tue, 21 Aug 2007 15:41:13 -0500,
(Hal Murray) wrote:
No, but I have enough years of experience with RF in general and radar
in particular to know building a phased array requires precise phase
(or frequency) control and you can't do that with an ultra wideband
device, which has a bandwidth of 500 Mhz.
At a minumum!
What is the bandwidth of modern radars? I'd expect it to be
wide and using spread spectrum tricks to make jaming harder.
Spiffy modern radars hop and chirp, both of which broaden the working
bandwidth.
I would hope so since the techniques have been around for at least
a quarter century.
With modern signal processing, wider radar bandwidth improves
resolution. You can do all sorts of fun stuff with 1000 antennas and a
few teraflops of compute power.
Narrower pulse widths and good receivers improves resolution.
All the major powers - US, Russia, France, Germany, China, Israel, UK
- are working on HPM weapons and array radars. The Brits call their
projects "Suave" and "Virus." MBDA and BAE are major players.
Google "mbda hpm" and "bae hpm", and believe it or don't.
A search for "mbda hpm" returns:
Your search - "mbda hpm" - did not match any documents.
And "bae hpm" returns:
SIMPLE = T / file conforms to fits standard BITPIX = 16 / number
John
You are mixing apples, oranges and cherries.
Frequency agile radar, rudimentary spread spectrum, was originally
developed in WWII.
Phased array radars have been around for decades.
And everyone WANTS a death ray, but no one has made a practical one yet.
--
Jim Pennino
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