Fórum Defesa Brasil

GDA_Fear escreveu:A informação que rola aí é que o Rafale foi com SPECTRA para o Red Flag.

PRick escreveu:Mas não usaram todo o SPECTRA, existe um debate muito antigo sobre algumas capacidades do SPECTRA, que acabaram se tornando um tipo de tabú.

“Spectra's active jamming subsystem uses phased-array antennas located at the roots of the canards. Dassault has stated that the EW transmit antennas can produce a pencil beam compatible with the accuracy of the receiver system, concentrating power on the threat while minimizing the chances of detection.

But there is more to Spectra than conventional jamming. Pierre-Yves Chaltiel, a Thales engineer on the Spectra program, remarked in a 1997 interview that Spectra uses "stealthy jamming modes that not only have a saturating effect, but make the aircraft invisible... There are some very specific techniques to obtain the signature of a real LO [low-observable] aircraft." When asked if he was talking about active cancellation, Chaltiel declined to answer.

Earlier this year, Thales and European missile-builder MBDA disclosed that they were working on active-cancellation technology for cruise missiles and had already tested it on a small unmanned aerial vehicle, using a combination of active and passive techniques to manage radar signature. This revelation makes it considerably more likely that active cancellation is already being developed for Rafale.

Active cancellation is a LO technique in which the aircraft, when painted by a radar, transmits a signal which mimics the echo that the radar will receive - but one half-wavelength out of phase, so that the radar sees no return at all. The advantage of this technique is that it uses very low power, compared with conventional EW, and provides no clues to the aircraft's presence; the challenge is that it requires very fast processing and that poorly executed active cancellation could make the target more rather than less visible.”

Skw escreveu:

GDA_Fear escreveu:A informação que rola aí é que o Rafale foi com SPECTRA para o Red Flag.

O Spectra estava configurado em modo passivo. Do que eu li, no Red Flag ou nos exercícios DACT da OTAN, as capacidades do Spectra em modo ativo nunca foram usadas.O que tem todo o sentido, não se entrega nada aos outros, o modo ativo é para ser usado em exercício da própria AdLA e em caso de conflito real.

PRick escreveu:Mas não usaram todo o SPECTRA, existe um debate muito antigo sobre algumas capacidades do SPECTRA, que acabaram se tornando um tipo de tabú.

Se fala que o Rafale teria um tipo de cancelamento ativo de radar. Porém, nunca foi confirmado pela Dassault. Então, estou céptico. No começo, tinha esse trecho num artigo do Bill Sweetman (jornalista na aviationweek) :

“Spectra's active jamming subsystem uses phased-array antennas located at the roots of the canards. Dassault has stated that the EW transmit antennas can produce a pencil beam compatible with the accuracy of the receiver system, concentrating power on the threat while minimizing the chances of detection.

But there is more to Spectra than conventional jamming. Pierre-Yves Chaltiel, a Thales engineer on the Spectra program, remarked in a 1997 interview that Spectra uses "stealthy jamming modes that not only have a saturating effect, but make the aircraft invisible... There are some very specific techniques to obtain the signature of a real LO [low-observable] aircraft." When asked if he was talking about active cancellation, Chaltiel declined to answer.

Earlier this year, Thales and European missile-builder MBDA disclosed that they were working on active-cancellation technology for cruise missiles and had already tested it on a small unmanned aerial vehicle, using a combination of active and passive techniques to manage radar signature. This revelation makes it considerably more likely that active cancellation is already being developed for Rafale.

Active cancellation is a LO technique in which the aircraft, when painted by a radar, transmits a signal which mimics the echo that the radar will receive - but one half-wavelength out of phase, so that the radar sees no return at all. The advantage of this technique is that it uses very low power, compared with conventional EW, and provides no clues to the aircraft's presence; the challenge is that it requires very fast processing and that poorly executed active cancellation could make the target more rather than less visible.”

Só posso dizer que os croassantes prometeram o Rafale F-3+ Full, . Quer dizer a FAB já deve saber hoje, o que existe de verdade ou não a respeito disso, e não vão poder divulgar seja lá qual for a capacidade do SPECTRA.

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Abraço,
Skw

Bourne escreveu:A compra dos armamentos é separada

Daí são mais mil páginas de discussões.

GDA_Fear escreveu:Eita ferro então nem AIM-120 e nem Meteor estão garantidos .

GDA_Fear escreveu:Eita ferro então nem AIM-120 e nem Meteor estão garantidos .

PRick escreveu:

GDA_Fear escreveu:Eita ferro então nem AIM-120 e nem Meteor estão garantidos .

Vamos dar um desconto, é o Godoy falando, as propostas dos concorrentess europeus devem ter o pacote de armas incluído. Já dos EUA...

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Skyway escreveu:Será que vamos abrir agora uma concorrência para o fornecimento de algum míssil BVR com transferencia de tecnologia?

Skyway escreveu:Será que vamos abrir agora uma concorrência para o fornecimento de algum míssil BVR com transferencia de tecnologia?