Precision ranging systems for close-range weapons

The paper traces the development of naval close-range radarranging devices from 1939 to 1944, and describes the factors responsible for the successive changes. A simple discussion of the prediction of aircraft future position, including a mathematical analysis of ¿rate-aiding¿ as a method of rate determination, is followed by a brief statement of the reasons for the introduction of radar ranging into naval fire-control systems. Two ranging panels are then described, and the special problems associated with their operation in conjunction with the auto-barrage unit are introduced. A description is given of the attempt to solve the close-range gunnery problem by the use of a self-contained gun mounting carrying all the necessary predictor and radar equipment. An auto-following radar set is analysed, and its most important advantages are discussed.