METHOD FOR SIGNAL SEARCH AND FOR INITIAL SYNCHRONIZATION OF CHANNELS IN SATELLITE COMMUNICATION SYSTEM AND DEVICE FOR IMPLEMENTATION OF SAID METHOD Russian patent published in 1996 - IPC

FIELD: radio communications. SUBSTANCE: device has circuit 1 for tracing frequency of reception synchronization signal. Said circuit has high-frequency channel circuit 2, mixer 3, multiplier 4, narrow-band filter 5, phase detector 6 including low- pass filter, controlled oscillator 7, frequency set synthesizer 8, circuit 9 for compensation of Doppler shift, which has differential mixers 10, 15, low-pass filters 11, 16, voltage adders 24, 30, circuit 12 for tracing delay in code of receiver of synchronization signal. Said circuit 12 has delay discriminator 13 including low-pass filter, controlled clock oscillator 14, synchronization code generator 17, transmitter code generator 18, automatic-frequency control circuit and automatic tuning transmitter search circuit 19, which has carrier discriminator 23 including low-pass filter, controlled oscillator 25, mixer 26, scanning unit 28, which has code discriminator 29 including low-pass filter, controlled clock oscillator 31, transmission code generator 33, high-pass filter 22, modulator 27, gates 34, 35. EFFECT: increased stability to noise in signal search and initial synchronization modes. 4 cl, 1 dwg