A Pulsed Pseudo-Noise VHF Radio Set

The design of a radio set using pulsed pseudo-noise signals is described. The unit uses pulse position modulation and matched-filter detection. The use of pulse compression techniques permits the radio to achieve good signal detectability; it also permits privacy for each of several sets operating in a common channel. Characteristics of the 280 Mc/sec rf system are given and the call-up logic for achieving telephone-like operation is described. Some aspects of the digital matched filter design are discussed. Analysis of theoretical operation shows only a small performance difference between digital and linear matched filters.