first all-weather, automatic-controlled gun systemdesigned to provide defense against close-in, sea-skimming cruise missiles that penetrate outerdefense systems. The main technical achievementof Phalanx is its closed-loop radar spotting andtracking ability. With closed-loop spotting, thefire-control guidance system can simultaneouslylocate the threat target and the projectiles of thePhalanx. It then automatically corrects the aim ofthe gun toward the target. The gun fires 20-mm,high-density penetrating projectiles at 3,000rounds per minute. The self-contained system canbe readily installed on any ship, from patrol boatto aircraft carrier.Figure 1-9.—Phalanx.1-17
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