阴影衰落环境下无线传感网络的概率覆盖研究

摘要

信号传播过程中因障碍物阻挡产生的阴影衰落对无线传感器网络的覆盖产生较大的影响.针对阴影衰落环境下无线传感器网络的覆盖问题,分析了主要相关因素对网络覆盖性能产生的影响,提出了基于概率的协作感知模型,并推导出满足一定覆盖质量要求时相应的协作感知半径,进而得出所需的最少工作节点数目及其与阴影衰落强度、网络感知概率和覆盖精度之间的关系.实验结果表明了该模型的合理性以及理论分析的正确性.%A shadow fading caused by obstructions in the surroundings of transmitting has an important effect on wireless sensor networks. By analysing the major factors, this paper presented a collaborative sensing model based on probability, and then derived the corresponding cooperative sensing radius and minimum working number which can satisfy the certain quality requirements of coverage. Besides, the relation that bewteen the minimum working number and the shadow fading strength, sensing probability, sensing accuracy is given. Experimental results show that the rationality of the model and the validity of theoretical analysis.