Research On The Protocol And Localization Technology In Wireless Sensor Networks For Coal Mine Security Monitoring

The nature condition of coal mine is complicated that potential security risk exist. Recently in our country, coal mine disasters occur frequently and bring serious loss of treasures and lives, present coal mine security monitoring system is no longer satisfy the needs of coal mine safety production. Wireless sensor networks(WSN), which have integrated wireless communication, data collection and information processing capacities, are booming technologies for collecting information in distributed and self-organized manner. Applying sensor networks in coal mine security monitoring will upgrade the mine safety level and reduce the hidden accident significantly. With this research background, this thesis focus on the protocol and localization technology of wireless sensor networks.ZigBee is a new wireless communication technology with the feature of low cost and low power which is proper for WSN. In order to satisfy the demand of coal mine security monitoring, A new AODV based routing protocol Cluster-Tree-AODV was proposed, which was also compete with ZigBee. simulation results show that the new protocol kept the good features of AODV and perform better in lager scale networks.In WSN application, the information of node's position is necessary. In this thesis, the localization algorithm based on the received signal strength indicator (RSSI) is proposed and optimized, consequently several factors which affect the localization precision is analyzed. Simulation results show that the optimized algorithm base on RSSI improve the localization precision effectively.