Gomig-21 wrote:Besides the marketing information like this:
Rezonans radars operate in the meter band and employ the principle of wave resonance, which allows detecting aircraft based on stealth technology and also hypersonic targets flying at a speed of up to Mach 20. The radar is capable of detecting targets and issuing target acquisition on aerodynamic targets at a distance of 600 km and at a range of 1,200 km on ballistic targets, at an altitude of up to 100 km.
How does resonance effect actually identify an F-35 for example? Using "meter band employing the resonance effect" doesn't tell us much. It would be nice to know a bit more about the basics of how the Resonance NE radar works, especially with the Protivnik-GE since both were bought by Egypt and curious as to how they would be able to see the Israeli F-35s for example?
I'm guessing that they're doing a lot of Intel with the Protivnik surveillance and watching for patterns and habits and developing a specific signature (since the distance is relatively close) and with the ability to IFF that they can create a library of signatures on all aircraft that are in the area and put them in their AWACs IFF information to recognize quicker who is out there etc. But not sure how the Resonance NE does it's actual radar work? Anyone?
People are obsessed with stealth because they have no physics education. All materials that absorb must emit. There are no black hole coatings. And geometry does
not work as people think it does. Quantum mechanics means that classical optics are only an approximation. So even an angled surface where classical optics would
have no scatter back to the source will always have some percentage of photons scattering back at the source. So modern Russian RADAR detectors can both discriminate
very weak scatter signals and also measure them in different EM bands. Using the meter band initial signal does not mean that the system only measures returning EM
in the same EM band. With RAM coatings it makes sense to have IR detectors. And the trick is time-resolved Fourier analysis. Out of the ambient IR coming from the
atmosphere and the ground, the RAM re-emission of meter band EM emissions will stand out due to very tight temporal correlation between the radar beam and the
The resonance angle adopted is likely a way to amplify and simplify the processing of the scattered signal. Here is one line of thought:
All systems (e.g. F-35) will resonate at some frequencies. This is not so trivial as not accounting for this properly can result in what happened to the Tacoma Narrows bridge.
(Resonance is not limited to acoustic-vibrational aspects, it applies in the EM realm as well.) The RADAR pumps the target with enough frequencies to get more efficient return
signal at some of them. It looks like one meter EM is all that is needed and not some UWB beam solution.