METHOD OF DETECTING SIGNALS WITHOUT CARRIERS

摘要

FIELD: radio engineering, communication.SUBSTANCE: analogue signal is received and digitised and its spectrum representation is formed, which is divided into equal high-frequency and low-frequency parts. Further, time readings are formed from the low-frequency part of the spectral components by inverse Fourier transform and the signal parameters chosen are maximum negative and positive values. The value of the threshold noise level is then calculated from the time readings formed from the low-frequency part of the spectral components. Signal parameters are compared with the value of the threshold noise level and a signal is detected if the magnitude of at least one of the parameters exceeds the value of the threshold noise level. The value of the threshold noise level is selected equal to at least three times the mean-square deviation of time readings formed from the low-frequency part of the spectral components of the received digitised signal.EFFECT: providing adaptive spatial selectivity of each radio receiving device for radio communication for each of the received radio signals, which increases noise-immunity of receiving messages.2 cl, 7 dwg