DEVICE TO GUARD RAILWAY CROSSING Russian patent published in 2009 - IPC B61L29/22 

FIELD: transport.

SUBSTANCE: device uses duplex radio communication between crossing duty official and operators of trains approaching the crossing on two frequencies and complex signals with phase, combined phase and amplitude modulation. Railway crossing has sealed alarm and level crossing gate button, units to switch on appropriate track circuit code signal generators, light signal switch-on units, automatic alarm signal generators, modulating code generator, vocal source, master oscillator, phase keying unit, amplitude modulator, two local oscillators, two mixers, 1^st intermediate frequency amplifier, two power amplifiers, duplexer, transceiver antenna, 2^nd intermediate frequency amplifier, multiplexer, bandpass filter, phase detector and recorder. The train comprises master oscillator, modulating code generator, phase keying unit, two local oscillators, 3^rd intermediate frequency amplifier, two power amplifiers, duplexer, transceiver antenna, 2^nd intermediate frequency amplifier, amplitude limiter, synchronous detector, audible indicator, multiplexer, bandpass filter, phase detector, memory and code comparison unit.

EFFECT: higher safety of railway traffic at crossings.

4 dwg