Difference between revisions of "Elliptical depolarization ratio"

From Glossary of Meteorology
imported>Perlwikibot
(Created page with " {{TermHeader}} {{TermSearch}} <div class="termentry"> <div class="term"> == elliptical depolarization ratio == </div> <div class="definition"><div class="short_definit...")
 
imported>Perlwikibot
 
Line 9: Line 9:
 
   </div>
 
   </div>
  
<div class="definition"><div class="short_definition">The ratio of [[power]] received in the transmission channel to power  received in the [[orthogonal]] channel of a [[dual-channel radar]], when an elliptically polarized [[signal]]  is transmitted. For a weather target, this ratio depends, in general, on the ratio of the major to  the minor axis of the [[polarization]] ellipse, the orientation of the ellipse, and the depolarizing  characteristics of the [[hydrometeors]] that constitute the [[target]].</div><br/> <div class="paragraph">Typically, the ratio will be less than unity (or a negative [[decibel]] quantity) when the major and  minor axes are comparable in size and the polarization ellipse is close to circular, but will be greater  than unity (or a positive decibel quantity) as the polarization ellipse becomes sufficiently elongated  on either of its axes. A greater [[depolarization ratio]] is achievable with elliptical than with [[circular  polarization]] by matching the axial ratio and the orientation of the transmitted signal to the  depolarizing characteristics of the target. <br/>''Compare'' [[cancellation ratio]], [[circular depolarization  ratio]].</div><br/> </div>
+
<div class="definition"><div class="short_definition">The ratio of [[power]] received in the transmission channel to power  received in the [[orthogonal]] channel of a [[dual-channel radar]], when an elliptically polarized [[signal]]  is transmitted. For a weather target, this ratio depends, in general, on the ratio of the major to  the minor axis of the [[polarization]] ellipse, the orientation of the ellipse, and the depolarizing  characteristics of the [[hydrometeors]] that constitute the [[target]].</div><br/> <div class="paragraph">Typically, the ratio will be less than unity (or a negative [[decibel]] quantity) when the major and  minor axes are comparable in size and the polarization ellipse is close to circular, but will be greater  than unity (or a positive decibel quantity) as the polarization ellipse becomes sufficiently elongated  on either of its axes. A greater [[depolarization ratio]] is achievable with elliptical than with [[circular polarization|circular  polarization]] by matching the axial ratio and the orientation of the transmitted signal to the  depolarizing characteristics of the target. <br/>''Compare'' [[cancellation ratio]], [[circular depolarization ratio|circular depolarization  ratio]].</div><br/> </div>
 
</div>
 
</div>
  

Latest revision as of 15:53, 25 April 2012



elliptical depolarization ratio

The ratio of power received in the transmission channel to power received in the orthogonal channel of a dual-channel radar, when an elliptically polarized signal is transmitted. For a weather target, this ratio depends, in general, on the ratio of the major to the minor axis of the polarization ellipse, the orientation of the ellipse, and the depolarizing characteristics of the hydrometeors that constitute the target.

Typically, the ratio will be less than unity (or a negative decibel quantity) when the major and minor axes are comparable in size and the polarization ellipse is close to circular, but will be greater than unity (or a positive decibel quantity) as the polarization ellipse becomes sufficiently elongated on either of its axes. A greater depolarization ratio is achievable with elliptical than with circular polarization by matching the axial ratio and the orientation of the transmitted signal to the depolarizing characteristics of the target.
Compare cancellation ratio, circular depolarization ratio.


Copyright 2022 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact permissions@ametsoc.org. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act (17 U.S. Code § 107) or that satisfies the conditions specified in Section 108 of the U.S.Copyright Act (17 USC § 108) does not require AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a website or in a searchable database, or other uses of this material, except as exempted by the above statement, require written permission or a license from AMS. Additional details are provided in the AMS Copyright Policy statement.