APPARATUS FOR UNDERGROUND WIRELESS EMERGENCY ENGINEERING COMMUNICATION Russian patent published in 2022 - IPC E21F17/18 

FIELD: wireless communication.

SUBSTANCE: invention relates to wireless communication systems installed and intended for operation in underground mine workings, including emergency alarms. Apparatus comprises a transmitting set installed on the surface of the ground, consisting of, series-connected, a reference generator, a frequency divider, a power amplifier, and antenna systems with deep earth rods, and an operating mode control panel connected with the output of the reference generator via a code sequence generator, the outputs of the control panel are connected to the second inputs of the frequency divider and the power amplifier, and a reception set located in the underground workings, containing an antenna connected to the input of the selective amplifier, the output whereof is connected with the inputs of two parallel-connected frequency mixers, and the second input of the first mixer is connected directly with the heterodyne output. The second input of the second frequency mixer is connected with the heterodyne via a phase shifter, the outputs of each frequency mixer are connected via the series-connected low-pass filter and threshold element to the input of the phase detector, the output whereof is connected with the input of the command decoder, connected to a loudspeaker via a speech converter and further via a low-frequency amplifier. The antennas of the transmitting set are therein supplemented with vertical beams, located in boreholes, and the deep earth rods have more than one point of connection with the ground, wherein each of said points has a lead from the borehole onto the surface. The distance between the boreholes is from 300 to 600 m, the vertical beams are buried into the boreholes to a depth of 30 to 1,000 m, and the reception set additionally comprises a low-frequency antenna and is additionally equipped with an RFID tag.

EFFECT: increase in the reliability of wireless emergency engineering communication, increase in the efficiency of electromagnetic wave transmission, including that in underground workings.

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