How fighter jets lock on, and how the targets know (2014)

Sat Jun 12, 8:22pm UTC
https://www.quora.com/How-does-a-fighter-jet-lock-onto-and-keep-track-of-an-enemy-aircraft-Can-an-aircraft-detect-that-it-has-been-locked-onto-or-is-it-just-a-convenient-plot-device-in-movies?share=1