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Area Militar General
Malvinas 1982
El Ataque al Portaaviones HMS Invencible
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<blockquote data-quote="SuperEtendard" data-source="post: 1525439" data-attributes="member: 128"><p>Finalmente entiendo porque insisten tanto con la nube de chaff...</p><p></p><p></p><p>3. Chaff Applications</p><p>Chaff in Naval use is most commonly ejected from rocket shell or mortar systems. Naval rockets can contain up to 7 kg of chaff, and mortar systems typically dispense up to 3 kg of chaff from several grenades fired simultaneously. There are three main modes of use for chaff at sea.</p><p></p><p>a. First Mode</p><p>This is known as distraction decoy dispensed by rockets and shells at ranges up to 2 km from the vessel, and a pattern of several rockets fired in different directions is used to provide alternative targets to missiles, which are still at some distance from the vessel.</p><p></p><p>b.Second Mode</p><p>This is known as the dump mode; it is used closer to the vessel (less than 1 km away) where it works as passive ECM (Electronic Counter Measure) to deny range information to the seeker and is used in conjunction with chaff fired from a rocket as false target to the attacking missile.</p><p></p><p>c.Third Mode</p><p>This is known as the centroid mode, used very close to the ship where the chaff cloud is dispensed at a range of 100-400 m. A large echoing area must be realized in a few seconds of firing and the chaff cloud appears initially near the ship. After the ship goes out and away from the chaff echo the missile becomes confused, avoiding the true target. The centroid mode is achieved with rockets or mortar systems and is a tactic which will succeed best with vessels of relatively small RCS (Radar Cross Section) such as converts or other ships.</p><p></p><p> </p><p>NAVAL POSTGRADUATE SCHOOL</p><p></p><p>Approved for public release; distribution is unlimited</p><p></p><p>Optimal Estimation of Target in Clutter (Chaff)</p><p>from Radar</p><p></p><p>by</p><p>Akylas Dim. Katsicogiannis</p><p>Lieutenant, Hellenic Navy</p><p>B.S., Greek Naval Academy, 1976</p><p></p><p></p><p><img src="http://www.frontline-defence.com/images/chaff_illustration.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p><img src="http://www.armedforces-int.com/upload/image_files/articles/images/companies/233/diagram.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p></p><p>En definitiva el chaff es lanzado a cierta distancia del buque mientras que éste maniobra para alejarse de la nube de chaff, como se aprecia en estas fotografías:</p><p></p><p><img src="http://sistemasdearmas.com.br/ggn/ggn3chaffflaredagaiemk2.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p><img src="http://sistemasdearmas.com.br/ggn/ggn3flarerusso.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p><img src="http://sitelife.aviationweek.com/ver1.0/Content/images/store/9/3/e9cbbda3-ff18-4565-8386-e22eb9a63615.Large.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p>Además el buque debe tener el "timing" para lanzar chaff (dependiendo si el chaff es charlie, delta o sierra).</p><p></p><p>Saludos</p></blockquote><p></p>
[QUOTE="SuperEtendard, post: 1525439, member: 128"] Finalmente entiendo porque insisten tanto con la nube de chaff... 3. Chaff Applications Chaff in Naval use is most commonly ejected from rocket shell or mortar systems. Naval rockets can contain up to 7 kg of chaff, and mortar systems typically dispense up to 3[B] [/B]kg of chaff from several grenades fired simultaneously. There are three main modes of use for chaff at sea. a. First Mode This is known as distraction decoy dispensed by rockets and shells at ranges up to 2 km from the vessel, and a pattern of several rockets fired in different directions is used to provide alternative targets to missiles, which are still at some distance from the vessel. b.Second Mode This is known as the dump mode; it is used closer to the vessel (less than 1 km away) where it works as passive ECM (Electronic Counter Measure) to deny range information to the seeker and is used in conjunction with chaff fired from a rocket as false target to the attacking missile. c.Third Mode This is known as the centroid mode, used very close to the ship where the chaff cloud is dispensed at a range of 100-400 m. A large echoing area must be realized in a few seconds of firing and the chaff cloud appears initially near the ship. After the ship goes out and away from the chaff echo the missile becomes confused, avoiding the true target. The centroid mode is achieved with rockets or mortar systems and is a tactic which will succeed best with vessels of relatively small RCS (Radar Cross Section) such as converts or other ships. NAVAL POSTGRADUATE SCHOOL Approved for public release; distribution is unlimited Optimal Estimation of Target in Clutter (Chaff) from Radar by Akylas Dim. Katsicogiannis Lieutenant, Hellenic Navy B.S., Greek Naval Academy, 1976 [IMG]http://www.frontline-defence.com/images/chaff_illustration.jpg[/IMG] [IMG]http://www.armedforces-int.com/upload/image_files/articles/images/companies/233/diagram.gif[/IMG] En definitiva el chaff es lanzado a cierta distancia del buque mientras que éste maniobra para alejarse de la nube de chaff, como se aprecia en estas fotografías: [IMG]http://sistemasdearmas.com.br/ggn/ggn3chaffflaredagaiemk2.jpg[/IMG] [IMG]http://sistemasdearmas.com.br/ggn/ggn3flarerusso.jpg[/IMG] [IMG]http://sitelife.aviationweek.com/ver1.0/Content/images/store/9/3/e9cbbda3-ff18-4565-8386-e22eb9a63615.Large.jpg[/IMG] Además el buque debe tener el "timing" para lanzar chaff (dependiendo si el chaff es charlie, delta o sierra). Saludos [/QUOTE]
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Malvinas 1982
El Ataque al Portaaviones HMS Invencible
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