Is there any way to distinguish between targets (on the P-18 screen, for example).
I would like to know what I'm shooting at, if it's a B-52 or another type of aircraft.
Your options for non cooperating target recognition is pretty limited.
In theory, comparing the plotting board to the P18 image is according to the book.
(Target type "8" on the plotting board is B52, "3" everybody else)
Another way is using our EW knowledge, due to physics, jamming metric wavelength radar is pretty space consuming.
(In short, only B52, or specialized EW aircraft could jam it. Fighters cannot.)