Fading: Difference between revisions

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|Meaning=#(''Also called'' fadeout.) Applied to an [[electromagnetic wave]], often a [[radio wave]], a drop  in its [[power]] or [[field strength]] below a specified level.
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|Explanation=#Weakening of a received radio or [[radar]] signal caused by changes in the propagation medium.<br/> The term was originally applied to long-period changes in [[signal strength]] over [[bistatic radar]]  links caused by [[interference]] between the [[signal]] reflected by the [[ionosphere]] and the direct,  unreflected signal or [[ground wave]]. It now refers to interference phenomena caused by any type  of [[multipath transmission]] either of tropospheric or ionospheric origin.
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== fading ==
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#<div class="definition"><div class="short_definition">(''Also called'' fadeout.) Applied to an [[electromagnetic wave]], often a [[radio wave]], a drop  in its [[power]] or [[field strength]] below a specified level.</div><br/> </div>
#<div class="definition"><div class="short_definition">Weakening of a received radio or [[radar]] signal caused by changes in the propagation medium.</div><br/> <div class="paragraph">The term was originally applied to long-period changes in [[signal strength]] over [[bistatic radar]]  links caused by [[interference]] between the [[signal]] reflected by the [[ionosphere]] and the direct,  unreflected signal or [[ground wave]]. It now refers to interference phenomena caused by any type  of [[multipath transmission]] either of tropospheric or ionospheric origin.</div><br/> </div>
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[[Category:Terms_F]]

Latest revision as of 11:00, 30 March 2024

  1. (Also called fadeout.) Applied to an electromagnetic wave, often a radio wave, a drop in its power or field strength below a specified level.
  2. Weakening of a received radio or radar signal caused by changes in the propagation medium.
    The term was originally applied to long-period changes in signal strength over bistatic radar links caused by interference between the signal reflected by the ionosphere and the direct, unreflected signal or ground wave. It now refers to interference phenomena caused by any type of multipath transmission either of tropospheric or ionospheric origin.

Any function of time f(t) is periodic with period t if f(t) = f(t + τ) for all times t, where τ is the smallest number for which this equality holds.

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