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无线传感器网络的主要目标是在各种资源受限的情况下取得用户所需的信息精确度。因此,有关信息精确度的理论模型对设计无线传感器网络中有效的协议很有价值。首先提出一种无线传感器网络中信息精确度定义,然后利用节点采样数据间的空间相关性得出信息精确度随采样节点个数(M)变化的关系模型。理论分析和仿真试验结果都表明:信息精确度并非随M的增大而持续增大,当M增大到一定程度后,信息精确度的增量将趋于零,从而纠正了增大M可以持续提高信息精确度的观点。理论模型可以用来确定一个合适的M以实现用最小的能耗代价取得尽可能精确的数据。
The primary goal of wireless sensor networks is to obtain the accuracy of the information the user needs with a variety of resources. Therefore, the theoretical model of information accuracy is valuable for designing effective protocols in wireless sensor networks. First, a definition of information accuracy in wireless sensor networks is proposed. Then, the relationship between the accuracy of information and the number of sampling nodes (M) is derived by using the spatial correlation between sampled data of nodes. Theoretical analysis and simulation results show that the accuracy of information does not increase with the increase of M, but when M increases to a certain extent, the increase of information accuracy tends to zero, thus correcting the fact that increasing M can Constantly improve the accuracy of information point of view. The theoretical model can be used to determine a suitable M to achieve as accurate data as possible with the least cost of energy.