METHOD OF CHARACTER SYNCHRONISATION WHEN RECEIVING CODE PULSE MODULATION OR FREQUENCY KEYING WITH FAMILIAR STRUCTURE Russian patent published in 2015 - IPC G06F17/14 H04B1/7073 

FIELD: radio engineering, communication.

SUBSTANCE: search of informational signal binary character limits involves two-level processing of an input signal. At the first level, the search of the character sequence limit is performed using FFT and calculation of coefficients for correlation between an instantaneous spectrum and frequency images of the information characters, as well as a frequency image of the character differentiation. If the spectrum "spreading" is registered, then strobe signals are generated and sent to a run-down generator of the character frequency to generate reference pulses of the character synchronisation. The second level involves the determination of the received information message character nominal value using a two-channel demodulating circuit, and generation of a synchronous code sequence. As a result, the processes of the character limit search and received binary character demodulation are transferred from the temporal field to the time-and-frequency field.

EFFECT: lower locking in synchronism duration.

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