Hello.
As we are all aware electronic warfare is a never ending game, as soon as somebody comes up with something a countermeasure is invented.
RADAR is one prime example, jamming and stealth are the watch words.
But, an anti-stealth is out.
The way stealth works is by absorbing or deflecting a RADAR signal so that there is little return signal to the emitter.
Well, there is now a counter measure for this.
The unit I have had a chance to observe works by having a RADAR unit in the nose of an aircraft that would appear to be quite normal.
However there are 2 wingtip mounted transmitters that may be full RADAR units or just transmitters.
The units in the wingtips transmit under a master controller and the nose unit only receives.
The moisture in the air gives a given amount of reflection, that is how weather RADAR works.
There is also a baseline of noise.
However a stealth aircraft leaves a "hole" in the air that is very much detectable by this scheme.
I only know this, the 2 transmitters are very much synced, both in frequency as well as timing of the pulses, very very precise control.
Everything else is just an educated guess.