煤矿井下低压电力线信道传输衰减特性研究

Research of channel transmission attenuation characteristics of underground low-voltage power line

针对煤矿井下低压电力线网络拓扑结构复杂,多径传输模型难以适用于煤矿井下低压电力线信道建模的问题,对煤矿井下低压电力线信道传输特性进行了测试,指出煤矿井下信号的衰减随着传输距离的增加而增加,随着频率的改变而改变,并伴随着一定的选择性衰落;把选择性衰落看作是谐振频率点,采用串联谐振电路模型对煤矿井下低压电力线信道衰减特性进行建模仿真,结果表明,串联谐振电路模型可以很好地反映煤矿井下低压电力线信道传输特性。

In view of problems that network topology of underground low-voltage power line is complex and multi-path transmission model is difficult to suit channel modeling of underground low-voltage power line, the paper made a test for channel transmission characteristics of underground low-voltage power line. It indicated that attenuation of underground signal increases with increasing of transmission distance and changes with changing of frequency, and has certain selective fading. It took selective fading as resonant frequency point and used model of series resonant circuit to make modeling simulation for channel attenuation characteristics of underground low-voltage power line, and the simulation result shows that the model of series resonant circuit can well reflect channel transmission characteristics of underground low- voltage power line.