TIME TRANSMISSION SIGNALS MODEM THROUGH THE SATELLITE COMMUNICATION DUPLEX CHANNEL Russian patent published in 2017 - IPC G04C11/00 H04B7/24 

FIELD: radio engineering, communication.

SUBSTANCE: modem can be used in the very long baseline radio interferometry (VLBI), in the single time and frequency service, as well as for the information exchange between the ground stations, spaced into the long distances, using the geostationary ESV-repeater. The modem contains the geostationary ESV-repeater, the first A and the second B ground stations, each of which contains the reference 1 of time and frequency, the heterodynes 2 and 3, the transmitting-receiving antenna 4, the duplexer 5, the power amplifiers 6 and 16, the mixers 7 and 14, the amplifier of the first intermediate frequency 8, the clippers 9 and 17, the memory units 10 and 18, the correlators 11 and 24, the pseudonoise signal generator 12, the switch 13, the amplifier 15 of the second intermediate frequency, frequency selector 19, the narrowband filter 20, the amplitude detector 21, the threshold unit 22, the key 23, the adjustable delay unit 25, the remultiplier 26, the lowpass filter 27, the extreme regulator 28 and the range indicator 29. The geostationary ESV-repeater 30 includes a transmitting-receiving antenna 31, the duplexer 32, the power amplifiers 33 and 40, the heterodyne 34, the mixer 35, the third intermediate frequency amplifier 36, the total frequency amplifier 37, the amplitude detector 38 and the key 39.

EFFECT: increase of the noise immunity and reliability of the time transmission through the duplex satellite communication channel by suppression of the false signals, received via additional channels, and automatic measurement of the inclined range up to the geostationary ESV-repeater in order to monitor its position in the orbit.

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