The Pentagon has ordered a new advanced ARM that is designed to allow the F-35 to destroy air defense emitters from beyond detection range by the defense.
http://www.thedrive.com/the-war-zone...it-inside-f-35
Discussion around the F-35 and other Stealth aircraft versus digital SAMS like the S-400
http://nationalinterest.org/blog/the...as-s-400-24187
Discussion around whether the Soviet . . . sorry Russian S-300, S-400 and S-500 could kill an F-35
http://nationalinterest.org/blog/the...-35-or-b-24114
Quote:
ofman notes that advanced Russian-built air defenses like the S-300, S-400 and forthcoming S-500 family come with systems designed to detect and track the presence of low observable (LO) aircraft such as the F-22 and F-35. That’s just a function of physics, as I have noted before. The problem for Moscow is that while Russian early warning and acquisitions radars operating in the VHF, UHF, L and S bands can detect and even track a tactical fighter-sized stealth aircraft, those systems don’t deliver a weapons quality track. “Russia has invested in low-band early warning radars, with some great variants out there, but can it use these to put a good picture together, and process it to develop a track against low-observation aircraft?” Kofman asked rhetorically. Physics dictate that a tactical fighter-sized stealth aircraft must be optimized to defeat higher-frequency bands such the C, X and Ku bands, which are used by fire control radars to produce a high-resolution track. Industry, Air Force and Navy officials all agree that there is a “step change” in an LO aircraft’s signature once the frequency wavelength exceeds a certain threshold and causes a resonant effect—which generally occurs at the top part of the S-band.
Typically, that resonance effect occurs when a feature on an aircraft—such as a tail-fin—is less than eight times the size of a particular frequency wavelength. Effectively, small stealth aircraft that do not have the size or weight allowances for two feet or more of radar absorbent material coatings on every surface are forced to make trades as to which frequency bands they are optimized for. That means that stealthy tactical fighters will show up on radars operating at a lower frequency bands—such as parts of the S or L band or even lower frequencies. Larger stealth aircraft such as the Northrop Grumman B-2 Spirit or forthcoming B-21 don’t have many of the airframe features that cause a resonance effect—and are, as such, much more effective against low-frequency radars.
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