传感器信号在下水道内传播的信道模型

In this paper, according to the law of the propagation of sensor signals in the limited space, the space in the sewer is divided into the near field area and the distant field area of two different regions. And the wave mode equations of the electromagnetic wave in the sewer is provided. It is pointed that if it has a greater conductivity or permeability or permittivity in the sewer, the attenuation rate is proved to be more smaller. The attenuation rate will become smaller when frequency gets higher and the increase of the sewer’s size is propitious to guide wave’s propagation.