A cathode-ray-labelled plan display

An account is given of a system for accepting extracted radar and associated information stored in either digital or analogue form and for displaying it on a cathode-ray tube as a plaque of characters marking the plan position of each track relative to an overlay or video map. A vector is added to denote the velocity and direction of each track. The characters are produced as brightened dots on a small raster centred on the track position. A good definition of character is achieved by a selection from 9×7 such dots per character. The all-transistor pattern-generator described in the paper uses digital techniques throughout and has ferrite-core storage. Experience with this generator shows that a 2 Mc/s element rate is suitable. Each track can be displayed in 360 microsec and hence 280 tracks can be displayed with a 10 c/s repetition rate.