DEVICE FOR AUTOMATIC SEARCH OF SIGNALS OF RADIO STATIONS Russian patent published in 1999 - IPC

FIELD: radio engineering, in particular, control centers for analysis of signals in region, automatic detection of radio stations which continuously alter their operation frequencies. SUBSTANCE: device has control signal generator, unit of reference frequencies, receiver with antenna, signal detector. Signal detector comprises waiting clock oscillator, clock frequency storage unit, phase difference level generator, threshold level generator, comparison unit, indicator. This results in possibility to identify monitored signal using N fixed frequencies upon generation of pulse sequence of initial clock frequency and its comparison to sequences of clock signal frequencies for each i-th frequency. Device judges detection of signal at i-th fixed frequency as issued by station under investigation by means of sequential Wald probability ratio criterion, when difference in arrivals of leading edges of adjacent pulses of sequences under comparison correspond to threshold values. EFFECT: increased probability of detection of communication channels upon frequent alteration of operation frequencies of radio stations under investigation in conditions of significant noise in environment. 11 dwg