METHOD OF UNDERGROUND FACILITIES OF SUBWAY MONITORING AND SYSTEM FOR ITS IMPLEMENTATION Russian patent published in 2020 - IPC G01S15/00 

FIELD: computer engineering.

SUBSTANCE: disclosed method and system relate to automation and computer engineering and can be used in constructing systems for automated monitoring of underground facilities of subway. System implementing said method comprises electronic identifiers 1.i (i=1, 2, …, n), reader 2 transmitting radio modem 3 with transceiver antenna 8, a receiving radio modem 5 with receiving antenna 23 connected to a computer. Each receiving identifier 1.i (i=1, 2, …, n) comprises piezocrystal 18, a microstrip transceiving antenna 19, electrodes 20, buses 21.1 and 21.2, a set of reflectors 22.1 and detecting element 22.2. Reader 2 comprises driving oscillator 6, circulator 7, high-frequency amplifier 9, phase detector 10, phase doubler 30, phase divider 31 for two, a second narrow-band filter 32, frequency detector 43, trigger 44 and a double balanced switch 45. Transmitting wireless modem 3 comprises first 11 and second 10 delay lines, pseudorandom sequence generator 12, adder 13, multiplier 14, narrowband filter 15, phase manipulator 16, power amplifier 17, phase meter 33, analogue-to-digital converter 34, reference phase shift generating unit 35, codes comparison unit 36, first 37, second 38 and third 39 keys, memory unit 41 and switch 42. Receiving radio modem 5 comprises high-frequency amplifier 24, demodulator 25 of phase-shift keyed signals, first 26 and second 27 multipliers, narrow-band filter 28 and low-pass filter 29.

EFFECT: high noise-immunity of receiving a phase-shift keyed signal and reliability of determining coordinates of electronic identifiers, as well as accuracy of changing phase shift Δϕ by eliminating the phenomenon of "reverse operation" of the second type.

2 cl, 6 dwg