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F-35 Lightning II : News & Discussions

Discussion in 'The Americas' started by Picard, Sep 4, 2012.

  1. Averageamerican

    Averageamerican Colonel ELITE MEMBER

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  2. Picdelamirand-oil

    Picdelamirand-oil Lt. Colonel MILITARY STRATEGIST

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    http://indiandefence.com/threads/f-35-lightning-ii-news-discussions.21525/page-281#post-493407
     
  3. Averageamerican

    Averageamerican Colonel ELITE MEMBER

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  4. Picdelamirand-oil

    Picdelamirand-oil Lt. Colonel MILITARY STRATEGIST

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    If Air Force doesn't buy its full complement the fly away F-35 price will not be $ 85 millions.
     
  5. BON PLAN

    BON PLAN Major SENIOR MEMBER

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    almost ready...

    That's the problem for years.
     
  6. Averageamerican

    Averageamerican Colonel ELITE MEMBER

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    That's true but wont be much more then legacy planes, don't think they are going to buy them in large lots, with repairs to be made later, upping the cost too much. They are going to put pressure on Lockheed for a final version. It will all work out in the end.
     
  7. Picdelamirand-oil

    Picdelamirand-oil Lt. Colonel MILITARY STRATEGIST

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    Is it why LRIP 9 and 10 is not yet agreed?
     
  8. BMD

    BMD Colonel ELITE MEMBER

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    Pickles. No meal is quite complete without them, yet still perfectly nutritional.
     
    Last edited: Aug 12, 2016
  9. Averageamerican

    Averageamerican Colonel ELITE MEMBER

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    Why are you in a hurry, the F35 will never be really complete its made to be upgraded and changed. You only need a weapon if there is a threat.
     
  10. somedude

    somedude Captain FULL MEMBER

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    Is that the new design for the F-35? I like it. It looks like it might actually be capable of flight.
     
  11. BMD

    BMD Colonel ELITE MEMBER

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    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 .
     
    Last edited: Aug 12, 2016
  12. BMD

    BMD Colonel ELITE MEMBER

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    https://basicsaboutaerodynamicsandavionics.wordpress.com/2016/03/29/electronic-countermeasure-ecm/

    Active cancellation is a theoretical military jamming technique that involves the sampling of an incoming radar signal, analyzing it, then returning the signal slightly out of phase, thus “cancelling” it out due to destructive interference. While there are no official information about jamming systems using this technique in service, it is rumored to be in use on Rafale with SPECTRA suite.

    Counter-countermeasures:

    • Frequency hoping ( active cancellation require exact information about pulses to produce cancellation pulses , thus frequency agile radar are likely unaffected )
    • PRF jitters ( cancellation pulses need to be transmitted at exact moment to produce desirable interference effect , random PRF render the jammer unable to predict when the next pulse coming )
    • Multiple radars
     
  13. BON PLAN

    BON PLAN Major SENIOR MEMBER

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    The insect on the scale is a prehistoric one? 1 m width....

    I dont think a F22 is stealthier than a bee....
     
  14. Averageamerican

    Averageamerican Colonel ELITE MEMBER

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    Rafale is a .5 and in the real world so far no weapons we have can stop F35s from getting to their targets and if we cant do it, very likely no one can either.
     
  15. BMD

    BMD Colonel ELITE MEMBER

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    No one cares what you and your blogs think. Also note that active cancellation is far from full proof, except maybe when applied to a stealth aircraft.
     

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