How do aircraft/fighter jets know that they are being locked on by an anti aircraft system or by another fighter jet?
In: 2036
As others have said tracking and locking radar operate on different frequencies of radio signal and different frequencies of pulses.
But these days that system of tracking/search and lock radar is rapidly becoming obsolete and more of a Hollywood trope. Electronically phased radar is becoming more common, and tracking and searching can be the same operation
https://en.m.wikipedia.org/wiki/Phased_array
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