| There are majority of incompatible monitoring systems in coal mine underground whichmakes tremendous waste of network resources. With the development of Internet of the Things(IOT), it provide a unified network platform to integrate such sytems and also provide thetechnology of wireless communication coverage, which makes the personnel and equipmentssensoring and locating realized easily in coal mine underground. As animportant part of coalmine monitoring system, Localization System based on IOT is responsible for realtime locatingand tracing of the personnel and equipments, for environment information awareness as well asfor the searching and rescuing the persons in distress, which is also an important guarantee tokeep coal mine safety production. However, the battery of wireless nodes are energy constrained,especially for the IOT wireless nodes, which will cost more energy when sometimestransmitting audio and vedio datas. Therefore, the application of Wireless Power Transmission(WPT) technology in coal mine will overcome such problems that will make sure that all thewireless nodes underground can keep enough energy, even the disaster occurred. In order toachieve the above goals, this paper provides a wireless localization system base on WPT whichcan be applicated to coal mine’s IOT.This article is divided into five partsto research the related key technologies. First, weanalyze the existing wireless positioning system in coal mine underground to identify itsproblems and deficiencies, then propose and design a personnel positioning system for coalmine IOT system. Secondly, establish of radio waves transmission channel model in the coalface and propose Ray-Tracing based Radio Waves Propagation Law (RTRWP Law). Thensimulate of wireless radio wave propagation characteristics in the coal face and coal mine tunnel,and design two kinds of different topologies for different application environment of wirelesslocalization system. In addition, givethe calculation method of the signal energy required by thewireless localization system. Fourth, for the two kinds of topologysin different environmentsapplication, provide two type of positioning algorithm corresponding, and the simulation resultsshow that the improved RSSI algorithm is better than the classical RSSI algorithm in reducingthepositioning error. Finally, but the most important part of this paper, design the wireless powertransmission system underground wireless localization system. In order to apply the wirelesspower transmission system in the coal mine underground, this paper presents the theoverlapping circular structure, experimental and simulation results show that the resonantcoupling power transmission system overlapping circle structure is able to achieve more than 50%transfer efficiency, and more adaptable than the traditional singlecoil system inunderground power transmission. |
PDF Full Text Request