Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!lll-winken!aunro!alberta!cpsc.ucalgary.ca!fsa!hermann
From: hermann@cpsc.ucalgary.ca (hermann)
Newsgroups: sci.electronics
Subject: Re: R.A.M. (was Re: Police Radar Frequency Info)
Message-ID: <HERMANN.91Jun21153941@gi.cpsc.ucalgary.ca>
Date: 21 Jun 91 21:39:41 GMT
References: <1991Jun14.211314.16835@en.ecn.purdue.edu> <2003@ole.UUCP>
	<1991Jun18.005130.28440@cs.mcgill.ca> <2017@ole.UUCP>
	<7372@celery15.UUCP>
Organization: U. of Calgary, Alberta, Canada
Lines: 19
In-Reply-To: skeffing@motcid.UUCP's message of 21 Jun 91 14:07:51 GMT

In article <7372@celery15.UUCP> skeffing@motcid.UUCP (John F. Skeffington) writes:
   ... The implication
   of being able to detect a stealth aircraft at 250 miles woufd be that
   it could detect a "normal" aircraft at several times that distance.  I 
   find this very interesting and would like to know more about it. 

I believe that those large (drivein theatre screen-sized) phased array radars
you see in some of the journals from time to time use "back-scattering". To
my understanding backscattering bounces signals off the upper layers of
atmosphere to "see" over the horizon. Added benefit is looking "down" on your
target, negating the effect of head-on countermeasures (stealth aircraft
emphasize reducing the "head-on" radar signature).

I have heard that large coastal phased arrays were used in the eastern block
for a few years before the west started using them.

|  Mike Hermann  | hermann@cpsc.ucalgary.ca
_Organized_ religion is like organized crime: it preys on people's weakness,
generates huge profits, and is nearly impossible to eradicate.