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1. Typical WSN basic structure According to the application characteristics of WSN in the field of industrial control, the network should have high real-time performance and reliability. Figure 1 is a typical network with a relatively simple structure (used in production vehicles, substations, etc. )
The network consists of m sub-networks. Each sub-network adopts a star-type network structure composed of several sensor nodes and one aggregation node. Each aggregation node between sub-networks transmits sub-network information to the monitoring center in a multi-hop manner.
2. Node System Architecture Design WSN convergence nodes are generally composed of functional units such as processors, wireless communications, and energy supplies. The processor unit is responsible for controlling the operation of the entire sink node, storing and processing the data sent by other nodes; the wireless communication unit is responsible for wireless communication with other nodes, exchanging control information and sending and receiving information data; and the energy supply unit provides the operation requirements for the entire node. The energy is usually powered by batteries with limited energy. Based on the basic structure of the node, this paper integrates the concept of spare parts, redundantly configures the two key components of the processing unit and the wireless transceiver unit, and joins the monitoring unit to form a dual processor aggregation node with monitoring function.
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0 Introduction Wireless sensor networks have a wide range of application prospects in the field of industrial control. However, application environments (such as power systems, machinery manufacturing, etc.) require relatively high network reliability. The sink node is the core node of the wireless sensor network. As the interface between the WSN internal network and the management node, it connects the sensor network and the external network such as the Internet. In the event of a failure, data transmission will be interrupted. Based on the structure of common aggregation nodes, this paper proposes a reliability design method for dual-processor aggregation nodes with redundancy of key components and retransmission mechanisms. Through the design of both hardware and software, the reliability of aggregation nodes is improved.