Research On 433MHz Wireless Node Designing And Networking

With the advantages of light weight, low cost and high maintainability, Wireless Sensor Networks(WSNs) is widely used in Structure Health Monitoring(SHM). However, much consideration must be given to the attenuation of wireless signals on the path of propagation, including path loss and penetration loss. When wireless node works in closed and semi-closed structures, the signal strength will be drastically reduced, which probably results in the failure of penetrating these structures and limits the application of WSNs in SHM. Aming at solving the problems above, this paper presents a designing method of 433 MHz wireless strain node with structure-penetrating ability, and investigates the network of 433 MHz wirless node. The main contents and innovative work are as follows:Firstly, this paper focuses on the problem of large propagation loss of wireless signal strength in structures, and presents a designing method of wireless strain node with structure-penetrating ability, which works at the frequency of 433 MHz. Through experiments, the designing method of wireless node is verified, and the structure-penetrating ability of 433 MHz wireless strain node is proved to be stronger than that of Telosb node, and the energy consumption of 433 MHz wireless node is less than that of Telosb node.Secondly, based on multi-channel single-sink wireless sensor network oriented to massive data transmission and 433 MHz wireless node, this paper proposes a designing method of multi-channel sink node and double-radio relay node. Network throughput increasement of multi-channel sink node and data relay of double-radio relay node is verified respectively.Thirdly, in order to address the difficulty in wireless parameters configuration of WSNs, wireless node dynamic configuration software is designed which allows for online and wireless configuration. The function of the designed software is verified experimentally.This thesis is supported by the National Science Fund for Distinguished Young Scholars(Grant No.51225502), Foundation of Graduate Innovation Center in NUAA(Grant No.kfjj130102).The thesis is finished in State Key Laboratory of Mechanics and Control of Mechanical Structures.