关键词: 无线传感器网络，节点定位，DV-Hop，前序节点

Abstract: DV-Hop algorithm is one of the most classic range-free localization algorithms in wireless sensor networks.In order to enhance the localization accuracy of the DV-Hop algorithm, this paper introduced two terms of the previous node and Total HopSize, and designed an improved MHDV-Hop algorithm. In the improved algorithm, the correction factor of unknown node to beacon node hops is calculated based on the number of PN. It not only dons't change the positioning process of the DV-Hop algorithm at lower ratio of beacon nodes and without additional hardware support, but also greatly improves the localization accuracy.

Key words: Wireless sensor networks, Node localization, DV-Hop, Previous node