无线传感器网络的诸多应用中,通常需跟踪与定位监测范围内的特定物理目标.目标物的精确定位是无线传感器网络在地质、环境监测和军事等领域的成功应用之关键.目前,GPS系统是技术较为成熟且应用领域最为广泛的定位系统,但其存在用户端高耗能、外型体积大和高成本以及固定基础辅助设施支持等缺陷,适用于无障碍阻挡的环境,而无线传感器网络的使用环境多.样化.距离矢量路由DV-Hop算法利用部分已知坐标信息的锚节点,确定无线传感器网络中的其他节点坐标.对DV-Hop的定位误差利用Rao-Cramer边界定理进行了深入的研究.%In many applications of the WSN (wireless sensor networks) , people usually need to track and locate the specific physical objects in monitoring range. Precise positioning of the target objects is the key of successful applications of WSN in the fields of geology, environmental monitoring and military affairs, etc. At present, GPS is a positioning system with mature technology and most wide application fields, but it has defects such as high energy consumption at client, big geometrical size, high cost and seeking fixed basic supporting facilities, these make it suitable for the environment of barrier-free only, but the using environment of wireless sensor networks are diverse. The Distance Vector-Hop(DV-Hop)algorithm uses the anchor nodes of part of known coordinates information to find other nodes' coordinates in WSN. In this paper we make an in-depth study on the positioning error of DV-Hop algorithm using Rao-Cramér bound theorem.
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