Digitrac display system for air-traffic control. II. Symbol generation

Symbols in the Digitrac system are produced by character generators. The total number of symbols required depends on the size of the system. A typical system, able to track about 100 targets simultaneously, needs three generators to produce all required symbols for the plan-position indicators and all data on the tabular displays. The workload is shared by using one generator for the raw-video indicators, one for the synthetic indicators, and the third for the tabular displays.