Subject: RE: RADAR
INVISIBILITY - SLIDE 84 - "FER DE LANCE" INDEX Date: Fri, 19 Apr 2002 17:35:16 -0500
Dear Suzanne,
The black shadow once
the object "disappears" from visual detection would be because the
cancellation process is not quite perfect in the real world. So by
using cancellation signals added to all reflection signals, and adding
the slightly delayed transmission of what would be seen from the other
side, some deviations occur. Also, the input signal to be canceled will
"speckle" and oscillate randomly in brightness etc. These are random,
due to both some random error in direction correlation and also in some
random errors in exact frequency spectrum duplication, as well as slight
random error in magnitudes of processed signals, and the random
"speckle" of the signal one works on. The end result is that a
"residue" of random very weak signals remain. They cover the whole
visible spectrum and beyond, and contain a complete spectrum of
"cancellation" errors. To get rid of the "sparkle" and "speckle" that
would result, one would have to adjust the cancellation gain up a bit.
The excess error signals tend to be mostly cancellation errors, so
result in the appearance of "black" rather than light. This would have
to be all across the spectrum, since the excess "speckle" or "sparkle"
errors are all across it. In simple terms, there has to be just a wee
bit too much cancellation, which is required, otherwise flashes and
speckles would get through.
So one would see a
sort of "black shadow", which is a decisive signature.
Cheers,
Tom Bearden
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