| The construction of wireless sensor network in field enviroment has the advantagesof multi-points, long-period, high-reliablity and self-forming. Comparing with thetranditional mathod in monitoring, it is more convenient and more intelligent. The aimof The system design projects is building wireless sensor network for monitoring offorest fire danger, obtaining the relevant data in the specific area of a specific timeperiod, and submitting the data available to the data requirements by providing datasupport and services.In the thesis, firstly, we analise the characteristics in field enviroment monitoringand establish the hardware and software design of wireless sensor network node, adoptthe system with hierarchical and clustered structure. Form the point view of systemreliability and energy consumption, the most suitable wireless communicationtechnologies are chosen.In hardware designing, the architecture of “Core+Expand†is adopted to enhancesysytem flexibility. Two boards with different RF performance are designed to fitchangeable enviroment. Experiments show that the node can cover the range from100to800meters, which is beyond most of the products in the market. In softwaredesigning, ZigBee protocal, devece-controlling program, heterogeneous networkinterconnection of the gateway and visual network manageming software arehierarchical designed, completing tasks of collecting and transmiting of these data.Aiming for the key performance of the system, RF characteristic, energycomsumption and2.4GHz ISM co-existance are analysed. Results show that theseparameters are identified with theoretical analysis. Also two models can be used toanalyse similar performance of the other system.In addition,basing on the protocal of ZigBee, the optimization for networkformation and the dynamic-power-adjust for end device are adopted to fit the fieldenvironmet. Finally, the integration test of system is given, which shows that the acheivementof acomplishing the design. |
PDF Full Text Request