Warehouse Monitoring System Based On Wireless Sensor Networks, Energy Management Study

With the rapid development of wireless communication, microelectronics and wireless sensor networks (WSN) technology, WSN is becoming a hot issue of research and application. It is a kind of network with large-scale, wireless self-organizing, multi-hop and other characteristics. In WSNs, the micro-nodes, made up of sensors, data processing module and wireless communication module, are widely used in such fields as environmental monitoring, health care, intelligent transportation, military, security to perceive and monitor data.The WSN nodes are driven by limited battery power, and it is impractical to replace or recharge the battery in the specific application environments, so energy consumption becomes the key issue affecting the networks'lifetime. Considering the WSN warehouse monitoring system's reality and to meet the long-term stability monitoring warehouse system's requirement, this paper will analyze and research from the perspective of power management, and explore ways to effectively reduce the energy consumption of network nodes to improve networks'lifetime.At the beginning, this subject started from the research background and significance, the structural characteristics and application of the WSN is introduced, and then, the situation of the network low-power design challenges are brought forward. Then, various power management strategies are described in detail from the aspect of dynamic power management, dynamic voltage modulation, sleep-wake up schedule and so on. On the one hand, the power management module, data processing module, information collection module and sleep circuits are designed by low-power technology, and the hardware monitoring platform constituted with CC2430 hard-core is realized. On the other hand, researching from the physical layer channel and the transmission rate selection, the media access layer of the transceiver design and improvement, the network layer of the tree topology design and improvement, the application layer break dormancy and power control, the Z_stack's low-power design is realized in the CC2430 hardware platform. Finally, by analysing and testing the nodes'dormant power, communication distance, networks'performance on the self-development warehouse monitoring system platforms, the lifetime of the WSN nodes is estimated. The effect of the hardware and software low-power design on WSN monitoring system's power management is verified, and finally, the long-term monitoring of warehouse design goal is achieved. Therefore, the research and improvement of WSN power management is of certain reference value to extend the monitoring system's lifetime.