[¦in·stən¦tā·nē·əs ‚ȯd·ə¦mad·ik ′gān kən‚trōl] (electronics) Portion of a radar system that automatically adjusts the gain of an amplifier for each pulse to obtain a substantially constant output-pulse peak amplitude with different input-pulse peak amplitudes; the circuit is fast enough to act during the time a pulse is passing through the amplifier.AcronymsSeeIAGC