Construction method of access network facing rail transit infrastructure service state detection

The invention discloses a construction method of an access network facing rail transit infrastructure service state detection, and belongs to the technical field of a rail transit safety information obtaining method. The construction method of the access network facing rail transit infrastructure service state detection comprises the steps that wireless communication is adopted by a sensor in a rail transit infrastructure service state detection system, and an upper communication layer and a lower communication layer are built; a communication address comprises two bytes, a communication frame format comprises nine parts, such as a synchronous head and a frame length, link power cost between every two adjacent nodes is obtained, the connection mode of an upper layer tree-shaped backbone network is obtained, and a communication network with the minimum network power cost is built; access nodes adopt a coverage area matching mode to carry out network access invitation on detection nodes to build a lower layer star-shaped detection network. Due to the fact that the upper layer network and the lower layer network are adopted, and the design of the communication address is adopted, the cost of network communication is reduced, network resources are saved, and energy consumption of communication is reduced. A communication structure of a detection network is optimized through a minimum spanning tree method, and communication efficiency of the whole communication network is improved. The construction method of the access network facing rail transit infrastructure service state detection can provide guarantee for safe operation of rail transit.