Abstract: Automatic gain control circuitry for high range resolution correlation ra systems used with passive-active missile seeker weapons to provide RF and IF gain control, acceptable angle track nutation signals, AGC video delay for low frequency signal variations, and minimum AGC response time compatible with system stability. AGC processing is initiated when the acquisition or active track mode is selected, if video presence exists as an output from a video presence integrator. Likewise active mode automatic angle tracking is interfaced through the AGC circuit and is inhibited when the received target amplitude is less than a selectively predetermined AGC amplitude delay.