Abstract: In wireless sensor networks used for target monitoring, aiming at the imbalance of security and energy consumption in source-location privacy preservation routing, a protocol called EPURA（Enhanced source-location Privacy Preservation protocol Using Random Angle） based on phantom routing is proposed. The phantom nodes are selected on base of combining the phantom source sub-region with random angle. Invalid paths are avoided by means of setting a tag field for the nodes in the visible area and the probability of overlapping path is greatly reduced when the packets are forwarded from the phantom nodes to the base station because of an excited flag. The MATLAB simulation results show that compared to the existing protocols, EPURA can effectively prolong the network safety time under the premise of increasing the energy consumption non-significantly.

Key words: wireless sensor networks, source-location privacy preservation, random angle, fan-shaped area, non-repetitive walk based on the least hops

摘要： 在目标监测型无线传感器网络中，针对源节点位置隐私保护中存在的安全性和能耗不均衡问题，在幻影路由的基础上，提出了一种基于随机角度的增强型源位置隐私保护协议EPURA。EPURA运用划分幻影源子区域和随机角度相结合的方法来选择幻影节点，通过给节点设置可视区标记字段来避免损耗路径的产生，激发位的设置又能在很大程度上减少幻影节点到基站的重合路径。MATLAB仿真表明，与已有的源位置隐私保护协议相比，EPURA在增加少量通信开销的基础上，能够有效地增加传感器网络的安全时间。

关键词: 无线传感器网络, 源位置隐私保护, 随机角度, 扇形区域, 无重复最少跳数