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Stealth is dead.

Discussion in 'Greater Asia & Middle East' started by Picdelamirand-oil, Jun 11, 2015.

  1. Averageamerican

    Averageamerican Colonel ELITE MEMBER

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  2. Averageamerican

    Averageamerican Colonel ELITE MEMBER

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  3. BMD

    BMD Colonel ELITE MEMBER

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    http://indiandefence.com/threads/f-35-lightning-ii-news-discussions.21525/page-283#post-493522

    https://basicsaboutaerodynamicsandavionics.wordpress.com/2016/03/04/stealth-techniques-and-benefits/

    [​IMG]

    It is a common misconception that stealth technology is short live and as radar get more powerful , soon , they will be able to out range weapon engagement envelop , thus renders all money spend on RCS reduction a waste. This impression is inaccurate because any technology that can increase a radar peak power or gain will also benefit a jammers in the same ways. And stealth have a synergy relationship with jamming .

    Another common opinion is that the gap in RCS can easily be close by using a more powerful jammer .This is also inaccurate because RCS directly proportional to the power required to jam a radar at a certain distance.Which mean when RCS is reduced to 1/100th the original value, the required jamming power is also reduced to 1/100th the original value to achieve the same effect.In others words, if a stealth aircraft need a 10 kW jammer , a conventional asset will need jammer with power of 10Mw or more

    If the jamming power is keeping the same then burn-through range is reduced by 10 times, which mean stealth assets( RCS =0.001m2 ) can get 10 times closer the threat compare to conventional aircraft ( RCS=0.1m2).In other words ,even if adversary radar can see through jamming of conventional assets from 400 km aways , a stealth asset can still get within 40 km of such radar using exactly same jamming system

    [​IMG]

    A common misconception is that any low-frequency radar can render stealth useless regardless of their transmitting power or aperture size (Ex: Tikhomirov NIIP L-band transmitter on the leading edge of Flanker series are often cited by enthusiasts as a counter stealth system ) , that is wrong however , while it true that stealth aircrafts will have higher RCS in Mie region.It is important to remember that given equal radar aperture area , lower frequency radars will have much lower gain compared to high-frequency radars , thus, they cannot concentrate energy as much and more vulnerable to jamming , lower gain also give them lower accuracy. As a result, most low-frequency radars have much bigger transmitting antenna compared high-mid frequency radar ,it is also the reason that fighters fire control radar still work in X-band, because a L-band , VHF band radars of similar size would be too inaccurate for any purpose others than early warning (their accuracy can be estimated by radar gain equation ).Simulation done by MBDA also shown that despite operating within low-frequency range from UHF to F band , AWACs radar still struggle to detect stealth aircrafts from their frontal aspect.

    Another common misconception is that the lower the operating frequency of the radar ( longer wavelength ) , the better it would perform again stealth assets , that is wrong, however , as can be seen from table above , even within Mie region , target’s RCS fluctuate significantly and can be smaller than value measured in optical region depending on exact frequency and target size. It is also important to note that if radar wavelength is too long compared to target dimension , it can fall into Rayleigh region , in which target’s RCS can get much smaller than in optical region .
     
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  4. DAC O DAC

    DAC O DAC FULL MEMBER

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