为保证在室内部署无线传感器网络节点时实现感知面积完全覆盖特定区域,在2.4GHz的ISM频段,依据对数距离模型,分析了因天线高度不同引起的节点有效覆盖面积的变化问题,讨论了有效通信半径与有效感知半径的关系。在传统的平面节点部署方法的基础上,提出了一种考虑天线高度等环境因素的室内无线传感器网络节点快速部署方案,定义了部署规则和补充规则,从而避免了因天线高度变化而引起的感知黑洞的产生。仿真和试验结果表明该方案可以有效保证规定区域的完全覆盖,具有应用价值。
Deployment strategy for Wireless Sensor Networks is an important issue. Most research works are based on the horizontal Scheme. However, many factors including the height of node' s antenna, one of the vertical factors, can also affect the indoor communication performance of sensor nodes, which is a main consideration to design an appropriate deployment scheme. In this paper, the variance of coverage caused by the different antenna' s height is analyzed, using log - distance indoor radio propagation model at 2.4GHz ISM band. The relationship between effective communication range and effective sensing range is also discussed. Based on traditional plane deployment strategies, a novel method is proposed to avoid the sensing collapsars. It first calculates the effective communication ranges, and eliminates the useless antenna' s height parameter which can not affect the full coverage of sensing area and communication area. Then, it projects the residual height parameter to the plane and uses classi- cal Deploy Rules to place the sensor nodes. Experiments and simulations indicate that this deployment strategy is useful and effective.