FIELD: radio engineering, detection systems, nonsearch device of frequency determination, measurement devices of parallel spectral analysis. SUBSTANCE: threshold binary detector has band-pass filter 1 which input is input of detector and threshold unit 3 which output is output of detector. First and second narrow-band band-elimination filters 4 and 5 and phase detector 2 which second input is connected to output of band-pass filter 1 are placed between band-pass filter 1 and threshold unit 3. Thanks to multiplication of amplitude-frequency and phase-frequency characteristics of high-quality narrow-band band-elimination filters with amplitude-frequency characteristics of band-pass filter and thanks to use of negation values of integral expressions in phase detector 2 in proposed structure of detector, that is, by polarity of signal, one can distinguish presence of signal in specified frequency band. EFFECT: increased selectivity and diminished probability of false detection of radio signals. 15 dwg
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