Abstract: Wireless Sensor Network (WSN) usually works in three-dimensional space, and therefore requires coverage algorithms for three-dimensional space. In this paper, the authors analyzed the coverage algorithm, Stand Guard Algorithm (SGA) in two-dimensional space, and then integrated the characteristics of threedimensional space to improve it, finally proposed a new coverage algorithm SSG in three-dimensional space. The algorithm SSG is a location-free algorithm, and its quality of service is examined by simulations.

Key words: Wireless Sensor Networks(WSN), coverage, coverage percentage, connectivity, network lifetime

摘要： 无线传感器网络通常都工作在三维空间中，因此需要三维空间中的覆盖算法。结合三维空间的特点对二维空间内的覆盖算法SGA进行改进，在此基础上提出一种三维空间的覆盖算法——SSG算法，该覆盖算法的优点是不依赖于节点位置信息，并通过仿真实验给出了覆盖质量分析。

关键词: 无线传感器网络, 覆盖, 覆盖率, 连通, 网络寿命