METHOD FOR MONITORING THE STATE OF UNDERGROUND STRUCTURES OF THE SUBWAY AND SYSTEM FOR ITS IMPLEMENTATION Russian patent published in 2021 - IPC G01S13/00 

FIELD: computer equipment.

SUBSTANCE: group of inventions relates to computer engineering. Disclosed is a system for monitoring the state of underground facilities of a subway, which comprises identifiers 1, reader 2 transmitting radio modem 3, a receiving radio modem 5 connected to computer 4. Electronic identifier 1.i (i = 1, 2, … n) comprises piezo crystal 18. Transmitting wireless modem 3 comprises multiplier 14, adder 13, a first narrow-band filter 15, phase-shift modulator 16, power amplifier 17, first delay line 11, pseudorandom sequence generator 12, phase meter 33, reference phase shift generating unit 30, analogue-to-digital converter 34, codes comparison unit 36, first 37, second 38 and third 39 keys, second delay line 40, memory unit 41, switch 42. Receiving radio modem 5 comprises receiving antenna 23, high frequency amplifier 24, demodulators 25 and 43 of complex PSK signals, multipliers 26, 27, 44 and 45, narrow-band filters 28 and 46, low-pass filters 29 and 47, phase inverters 48 and 49, subtractor 50.

EFFECT: technical result is high noise immunity and reliability of monitoring underground structures of metro facilities by attenuation of narrow-band interference.

2 cl, 6 dwg