MULTICHANNEL DIGITAL RADIO MONITORING SYSTEM FOR NON-WATCHED CROSSING AUTOMATIC CONTROL DEVICES Russian patent published in 2006 - IPC B61L29/00 

FIELD: railway transport; signaling and communication.

SUBSTANCE: proposed system consists of equipment of central station and crossings, including coders-decoders, railway radio stations. As distinct from known ones, in proposed central station oscillation of carrier frequency of railway radio station transmitter is one-time keyed in phase by codogram through 180° which is detected in phase in radio station receiver of all crossings simultaneously. Received codogram is beginning of reading of data transmission in succession from each crossing to central station through definite laps of time. The latter is set by fitted-in time relay. Data from each crossing is transmitted by means of oscillation of radio station transmitter carrier frequency in twice keyed phase: over inphase channel in case of good working order and over quadrature channel in case of trouble. Demodulator of central station separates data in phase, and decoder decodes data transmits it to corresponding indicator.

EFFECT: system solves problem of deficiency of operating frequencies as it provides simultaneous transmission of coded data and speech on one operating frequency of radio station without interference, and it provides improved safety of railway and road transport.

2 dwg