How does a Radar-Warning-System (RWR) identify whether a bandit has successfully gained a radar lock?

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I understand how you’d detect lasing but not radar lock, especially at the distances and intensities involved (like I’m familiar with how an NMR machine works but I cannot correlate it with RWR).

MAWS also make sense – you’re scanning with radar or laser or IR and use doppler effects to notice something is moving towards you.

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Imagine a search light rotating in a large open stadium. You are on the run inside this stadium. How would you know if they have found you?
It’s when the search light stops rotating and points directly at you, right?
We look for the same thing in radar. If it’s just searching, the targeting would just sweap around. If it’s found you, it would be directly on you with radar waves hitting you at very high frequency.

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