Analysis of wireless signal coupling law on coal face

For the problem of wireless sensor network (WSN) transmission on coal face, communication space of coal face was divided into two spaces according to its wireless communication characteristics. Influence of hydraulic supports on WSN node communication of coal face was analyzed by use of ray tracing method, and three signal transmission areas on coal face were defined for wireless signal source, which were near area, transitional area and far area. Numerical calculation of each signal transmission area was taken out, and a law was gotten that signal coupling of two communication spaces was only in the near area of wireless signal source. A strategy of WSN node distribution on coal face was proposed according to the law, which was simulated in NS2 soft. The simulation results show that the strategy has long network lifetime and good effect of date receiving and sending.