METHOD OF MONITORING CONDITION OF UNDERGROUND STRUCTURES AND SYSTEM FOR ITS IMPLEMENTATION Russian patent published in 2020 - IPC G01S5/14 G01S13/88 G01C21/30 

FIELD: computer equipment.

SUBSTANCE: disclosed method and system relate to automatics and computer engineering and can be used in designing systems for automated monitoring of underground structures of subways. System for monitoring underground facilities of a subway system implementing the disclosed method comprises electronic identifiers 1.j (j = 1, 2, …4), reader 2 transmitting radio modem 3 with transceiver antenna 8, a receiving radio modem 5 with receiving antenna 23 connected to computer 4. Electronic identifiers 1.j are fixed on elements of underground structures of metro, reader 2 and transmitting radio modem 3 with transceiving antenna 8 are placed in cabin of electric train driver, receiving radio modem 5 with receiving antenna 23 and computer 4 are placed at terminal metro station. Electronic identifier 1.j comprises a piezocrystal, a microstrip antenna, electrodes, buses, a set of reflectors and a sensitive element. Reader 2 comprises master oscillator 6, circulator 7, transceiving antenna 8, a high frequency amplifier, a phase detector, a phase doubler, a phase divider for two, a second narrow-band filter, a heterodyne, a low-pass filter, a FAD4 system, a multiplier, a third narrow-band filter and mixer. Transmitting wireless modem 3 comprises a first multiplier, a first narrowband filter, a phase manipulator, a power amplifier, a delay line, a pseudorandom sequence generator, an adder, a phase meter, an analogue-to-digital converter, unit for generating reference phase shift, unit for comparing codes, keys, memory unit and switch. Receiving radio modem 5 comprises a receiving antenna, a high-frequency amplifier, a FAD4 system, a multiplier, a mixer, a narrow-band filter, a low-pass filter, a phase detector and a heterodyne.

EFFECT: high noise-immunity and reliability of reception and detection of complex signals with phase-shift keying (PSK) of combining two operations: conversion of received complex PSK signals by frequency and detection thereof.

2 cl, 4 dwg