无线地下磁感应通信系统研究与实现

Analysis and Implementation of Magnetic Induction Wireless Underground Communication System

无线磁感应通信通过准静态磁场耦合的方式实现数据传输,可以克服传统电磁波无线通信在地下环境中信道不稳定、天线尺寸大等问题,更适用于无线地下传感器网络。针对无线地下传感网络的应用需求,本文建立了基于收发线圈的磁感应耦合式无线通信模型,分析了发射磁场的分布特点,设计了无线地下磁感应通信系统,搭建了实验测试平台。实验结果表明,该系统在地下环境中可以实现短距离的无线数据传输,通过增大收发线圈的半径和增加匝数可以延长通信距离,改善系统通信性能,为无线地下传感网络的应用提供参考。

Magnetic induction wireless communication （MIWC）is a new technique transmitting data by quasi-static coupled magnetic field. The traditional electromagnetic-wave-based wireless communication in the underground envi- ronment encounters many challenges such as complex channel states and the requirement of large antenna size etc. MIWC can be regarded as an alternative means for underground communication, so that it is more suitable for wireless underground sensor networks（WUSNs）. Considering the requirement of the WUSNs,a wireless communication model based on magnetic coupling coils is established and the distribution of the magnetic field is analyzed. Furthermore, the magnetic induction wireless underground communication system is designed and the experimental platform is built. Test results prove that the system can realize short distance wireless data transmission in the underground environment and the communication distance can be extended by increasing the radius of coils and the number of turns. The results indicate the feasibility of underground MIWC,thus providing a paradigm for the application of the WUSNs.