"Jim Lux" wrote in message
...
Ed Cregger wrote:
wrote in message
...
On Oct 31, 1:27 pm, "Ed Cregger" wrote:
Perhaps someone can answer a question or two about synthetic aperture
radar
systems. I'm interested in whether or not the flat plate we see as the
receiver antenna actually radiates power, or is a separate transmitter
antenna used? TIA

Ed, NM2K
Synthetic Aperture Radar (SAR) isn't usually the rotating antenna
thing. SAR would be on some sort of moving platform (a plane or
satellite, for instance, although SARs have been done on cars and
boats and balloons)

Perhaps what you're thinking about is a phased array antenna? The flat
plate thing is the antenna, and might be either totally passive (and
can work for both transmit and receive) or active, with lots of T/R
modules.


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I was thinking of the Aegis class warships.

the SPY-1 isn't a SAR (well.. it might be able to do ISAR if the target
is moving or rotating) but it does use the same aperture for Tx and Rx.
(Racks and Racks of L band T/R modules)

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Well, I said I was behind the times. G

Thanks to everyone for their help on getting me up to date. At least I have
somewhere to begin studying now.

Ed, NM2K