'Imprecise Radar was: Fuzzy logic..'
David J. Porter
|On Sun, 27 Oct 1996 09:53:52 -0600, Martin J. Maney wrote:
>On Sat, 26 Oct 1996, Tom Rogers wrote:
>> Consider the current popular concept of how radar works: if you delve into
> subject you'll find that there isn't the pop science precision that has been
> seen in the movies and on tv for years. Instead, there's a terribly imprecise
> sort of 'blob' of energy that may or may not represent a legitimate echo. The
> problem is to quantify these blips of signal and decide whether or not there's
> something that should be displayed on the operator's vdt.
Radar used to show aircraft always had the problem of filtering out
weather. Of course, the weather radar has the problem of filtering
out aircraft. Radar has used many types of filtering since its
inception. My understanding is that matched filtering is about as
good as you can get and stay deterministic. It is a non-trivial
problem, but hardly a terribly imprecise one.
All measurement contains the same processes and sources of
imprecision. Some of these imprecision sources are insignificant
in one type of measurement, but quite significant in others.
Specific measurement and detection techniques can raise the
signal-to-noise ratio to useful levels.
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