【摘要】 针对目前矿井无线通信技术存在的不足,详细分析了IEEE802.15.4标准和ZigBee技术,讨论了二者的关系及技术特点,在此基础上,提出了一种基于ZigBee技术的无线传感器网络定位系统。网络采用基于到达时间(time of arrival,TOA)的定位机制,先根据信号的传播时间和传播速度计算出节点间的距离,然后由极大似然估计法(maximum likelihood estimation,MLE)确定目标节点的位置。系统满足井下通信的要求,安装简单方便,精度高,稳定性好。更多还原

【Abstract】 Against the shortcomings of the traditional wireless communication technology used in mine,IEEE802.15.4 standard and ZigBee protocol were analyzed in detail,and the relationship and features were studied.The designed realization plan of WSN(wireless sensor network) positioning system was presented based upon ZigBee protocol,which adapted the location mechanism of the time of arrival(TOA).The distance among the nodes is calculated according to transmission time and speed,and the unknown node position is estimated by the maximum likelihood estimation(MLE).The positioning system can meet the requirement of mining communication,and compared with traditional system,it is more suitable for mining position because of flexibility,extensibility and exact data.更多还原