On Wed, 19 May 2004 00:57:56 +0100, phil hunt wrote:

What is "silent sentry"?

From http://www.dtic.mil/ndia/jaws/sentry.pdf

The heart of Silent Sentry is its innovative Passive Coherent Location
(PCL) technology developed by Lockheed Martin Mission Systems, which uses
everyday broadcast signals, such as those for television and radio, to
illuminate, detect and track objects. A passive detection system for U.S.
government civil agency and military purposes, Silent Sentry transmits no
radio frequency (RF) energy as conventional radar does and has no RF
"signature" to alert enemy threats. Instead, it can use the energy that
already exists in airspace for detection purposes, and does not adversely
affect or harm the environment.

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-Jeff B.
yeff at erols dot com