【作者】 张宇；

【导师】 吕振；

【作者基本信息】 辽宁工程技术大学 ， 控制理论与控制工程， 2014， 硕士

【摘要】 我们国家煤炭能源富饶,可是自然的环境复杂多变,有多种安全隐忧。最近几年,我们国家经常发生煤炭灾难。灾难发生以后,现有的安全监控系统,往往不能立刻的完成对井下正在作业的工人进行精准的定位,这对第一时间援助被困工人造成了严重的干扰,这样会使得工作人员有巨大伤亡并且造成严重的经济损失。本文基于这种背景,设计了一种基于无线传感网络的井下定位系统,此系统可以有效的提高煤矿安全生产监控和管理水平,减小事故带来的损失。文章首先设计了一种改进的基于RSSI的改进的加权质心定位算法,该算法把锚节点与未知节点之间的距离的倒数之和作为锚节点的权值,充分的使用了RSSI的数据信息,防止了信息的丢失,完成对未知节点的定位。因为RSSI的值在井下环境中非常容易受到干扰,这样算出的定位结果非常不稳定,因此本文对RSSI值进行了修正,增强了数据的可靠程度,进而提升了定位结果的精准度。经过仿真的实验的解析,改进后的定位算法能够在一定范围内有效的提高系统的定位精准度。其次,因为井下的地形非常复杂而且经常变化,所以要对网关节点、固定节点以及移动节点进行了软硬件的设计。网关节点以及路由节点都采用了CC2430芯片来进行设计,而移动节点则采用具有定位引擎的CC2431芯片来进行设计,实现对移动节点的自定位。更多还原

【Abstract】 our country coal resources are rich, but the natural environment is more complex, there are many potential safety hazard. After the accident, the existing security monitoring system, can not be timely implementation of accurate location of underground workers, the serious influence for the first time to rescue people trapped, causing heavy casualties and economic losses. Based on this background, this paper designed a kind of downhole positioning system based on wireless sensor network, this system can effectively improve the level of coal mine safety production monitoring and management, reduce the accident loss.Firstly, this paper presents an improved RSSI based weighted centroid localization algorithm, which makes use of the reciprocal sum of distance between the beacon nodes and unknown nodes as the beacon node weight, make full use of RSSI data, and avoid information submerged, to locate unknown nodes. Because the RSSI value is easily influenced by outside environment factors, the positioning calculation results will also be impacted, so the paper correct the RSSI value to improve the reliability of the data, thereby improve the positioning accuracy. Through the simulation analysis, the improved algorithm can effectively improve the positioning accuracy of the system to a certain extent.Secondly, in order to adapt to the subsurface environment is complex and changeable features, gateway nodes, route nodes and mobile nodes for the design of hardware and software. Gateway nodes, and routing node of CC2430 chips has been adopted to design, while the mobile node location engine:the CC2431 chip to design, implement the positioning of mobile node.更多还原