>How much would a RADAR cost to cover the area? How easy is it to
>detect a person on RADAR?

That reminds me..

A few years back there were some press releases regarding
a "radar on a chip" system developed by lawrence livermore labs.
I seem to recall that they were going to be manufactured for
automotive anti-collision systems etc.. might be worth checking!

I believe a lot of licences have been sold, maybe some of these
licencees should have reached commercial product status by now!..

Ray Gardiner (DSP Systems) ray@dsp-systems.com http://www.dsp-systems.com
private email to:- ray@netspace.net.au