Thnaks, but something remains for me.

I know about angular velocity as I wrote, but what about target distance (it is linked to angular velocity, but you have to know at least the missile-target velocity) and missile-target velocity (GSN knows the doppler frequency). So how the correct time moment is calculated?

You can have a big "PROMACH" (miss distance), especially in case of close and/or highly reflective target, and warhead would detonate if you relied only on angular velocity.