| Wireless sensor network(WSN) is a new sort of wireless self-organized network. It can collect environment information about target area by deploying a huge number of sensor nodes,and these information will be transmitted to gateway node by multi-hop route. By applying wireless sensor network to outdoor prospect field,we can gain the benefit of retrieving data collected by nodes fast. This paper aims to develop a software which has the function of networking simulation and management in the regard of nodes deploy and fast data retrieve. With this software,user can simulate networking in the specific environment, and send data request to nodes,retrieving data from nodes conveniently and reliablyThis paper reviews the key technologies of wireless sensor network firstly, and then introduces several attenuation models of wireless signal transmission in outdoor environment. On the basis of constructing a wireless sensor network model,the paper designs a tree topology control algorithm, this algorithm can make the topology adjust to node joining, leaving and moving events adaptively, simulating the construction and maintenance of network topology.The software this paper designs can request both file data and real time data. In order to realize reliable transmission of file data, this paper designs a file transfer protocol on application layer between software and nodes.With the strategy of file receivers sending acknowledgement and file sender retransmitting when the acknowledgement timeouts, this software realizes reliable file transmission on unreliable transmission layer.With use of sliding window strategy, the transmission efficiency of file data is improved. When it comes to real time data, the software sends it merely with UDP protocol.The processing result of real-time data is shown in the form of real time diagram.Test result proves that this software can simulate the construction and maintenance of WSN topology,and can retrieve data from nodes conveniently and reliably. |
PDF Full Text Request