【摘要】 为实现有效的电磁波随钻测量,提出一种基于磁感应波的甚低频无线通信模型,并建立系统模型。通过系统的电流色散方程对系统带宽、传播能量等进行推导分析。针对磁感应波随钻测量系统中发生微变的参数,通过引入网络中相邻节点之间的传递因子和互感品质因数,建立了系统的传递方程。针对信号逐级传输过程中的谐振频率偏差损耗,增加连续可调电感进行频率补偿。最后搭建磁感应网络实验平台进行测试,结果表明信号在甚低频磁感应波智能钻杆系统中可以实现远距离的通信,当信噪比为-2 d B且保证通信速率为2 kbit/s时,通信距离可达1 800 m。更多还原

【Abstract】 In order to achieve an effective measurement while drilling,a very low frequency wireless communication model based on magneto-inductive wave was proposed,and the model was of the measurement system while drilling established. The bandwidth and the transmission energy of the system were derived based on the current dispersion equations. Considering that the parameters of the magneto-inductive measurement system while drilling may change slightly,the transfer factor and the mutual-inductance quality factor of the magneto-inductive network were introduced to the transfer function of the system. The performance of the system was tested on experimental platform,and the result shows that the magneto-inductive measurement system while drilling can achieve long-distance wireless communication,and the communication distance can reach to 1 800 m under the signal-to-noise ratio of-2 d B and the communication rate of 2 kbit / s.更多还原