The classic approach to "stealth" aims to disperse the signal striking the target in multiple directions or absorb the signal to attenuate the reflected signal. That works when the radar transmitter/receiver is in a single location. The new approach is a form of "crowd sourcing" using ganged radar receivers at multiple locations. The "ping" from a transmitter is received by multiple receivers at widely separated locations. That data is correlated to resolve a target. The short answer is that "stealth" is a technology that is nearing its useful life as detection techniques have improved. The advent of an RF rich environment creates an "ocean" through which aircraft must travel. The RF acts as a passive transmitter. If you fly an absorbing object through that "ocean", it creates a detectable disruption. The "ganged" receiver approach can resolve a target that way, albeit with "fuzzier" resolution than a standard radar T/R approach.
BTW, you "beat" the ganged radar by breaking the data links used to "gang" the receivers. That puts your "stealth" back in business. The bad guys have been using buried fiber optic cable for the data links.
Interesting...sounds like it takes alot of equipment and processign power to ‘defeat’ stealth. No way the Iranians did this by themselves.
Perhaps our pals the Russians have been gently stabbing us in the back.
I've been saying for a while to F-22 fans that if we spend a huge amount of money on it because it's stealthy, and then stealth is defeated, then we're worse of than if we build a much larger number of improved F-15s.