Originally Posted By: Alien_MasterMynd
Thanks, now the principle is clear to me.
RPC is tracking the target and when VGPO jamming is active, than the heading and elevation (its change in time respectively) of RPC would not correlate with target's velocity and when difference in velocity (calculated in doppler frequency) is greater than 4,6 or 0,8kHz, then it will switch AS-3 off and enters RU mode.


Not exactly IMHO, as the beta/epsilon tracking is based a bit like in SA-4... Comparing received signal between 2 or more receivers... Remember that velocity is a way to discriminate targets also. When VGPO kicks in, it took your narrow AS velocity gate from the target velocity return and lead it away (another speed zone), and when it was switching off, there is nothing to be tracked, so AS on velocity is lost (meanwhile if target maneuvers, it could slips away from the beam, thus cannot be find even when return velocity gates according the targets speed. That's why when we're tracking maneuvering target (which could use jamming as we expected), it is better to use POLOSA SHIROKAYA, as the target itself could suddenly changes it's radial speed toward us....


Last edited by piston79; 12/29/15 08:42 PM.