Study Of The Mine Shaft Wireless Network Communications System

This text introduce the mine shaft wireless communications system, its essential target is realizes the mine shaft personnel localization and the signal and the information wireless network transmission. In the comprehensive understanding mine shaft wireless communication development history and in the technical present situation foundation, proposed the short distance wireless transmission and the network main line unify, constitution mine shaft wireless communications system technical concept.The mine shaft wireless communications system hardware by three parts of constitutions, has been composed a complete system: The ground main engine, uses in the superintendent dispatch control; Network radio frequency substation, in receiving and dispatching well lane migration radio-frequency signal; The motion radio frequency transceiver, transmits the equipment, personnel's information or the language signal.According to the mine shaft tunnel to the microwave frequency band in the certain degree to the channel characteristic, the radio frequency selects the microwave frequency band 433MHz to make the carrier, enables the wireless signal to carry on the effective dissemination in the line of sight distance, has the transmission stability to be good, external interference small merit. The actual system selects Norwegian Nordic Corporation monolithic receiving and dispatching chip nRF401, the straight line propagation distance range of validity is 50-100m.The network analysis situs system selects the main line distributional structure, uses the mature industry control network CANBUS technology, its highest correspondence speed may reach 1 Mbps/40m, its farthest may reach 5Kbps/10km, may satisfy the common information and the pronunciation transmission speed and the distance request.In order to guarantee the reliability of the wireless transmission, has formulated the appropriate system and the scene request transmission agreement...