Research On The Technology For Coal Mine Communication Based On Power Lines

The thesis theoretically studies several mathematical models of power line channel, and uses Matlab simulation tools to simulate divergent diagram and eye diagram of various channles to directly reflect the performance of the channels. It uses the worst parameters approximation method in a fixed communication distance to conduct an empirical study on low-frequency characteristics of the actual power line transmission channel. It establishes the PLC network topology model based on the basic graph theory, and proposes access domain routing theory based on "communities" forwarding chain. By improving ant colony algorithm and using Matlab simulation in the ant colony routing algorithm based on the "seed node", it proves that the model can significantly reduce the re-calculation time with the ant colony algorithm. For the first time, it proposes a new Network-N-WSN with LonWorks technique and LonTalk Control Network Protocol. A ground test was conducted to test the efficiency of the system. Based on the characteristics of coal mine underground distribution network and its load, several power line information transmission strategies are proposed to improve the performance of power line channel transmission.