A method of controlling antiaircraft fire is described in which an aircraft is tracked continuously during the flight of a burst of projectiles and the probability of a hit is continuously revised according to the latest target maneuver as the projectiles proceed to the intercept point. If, before all of the projectiles reach the aircraft, the probability of a hit falls below a specified level, another burst of projectiles is fired. As this second burst proceeds to target its computed probability of hit is combined with that of the previously fired burst to determine the cumulative probability of hit of the two bursts taken together. If, before the second burst reaches the target, the cumulative probability falls below the specified level then a third burst is fired. This activity repeats until the cumulative probability of hit is driven up and kept up above the specified level.
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