Abstract: VIrtual Scanning Algorithm（VISA) is unable to fully take advantage of the number of nodes, in order to prolong the network lifetime, it must be built on the basis of dense nodes deployment which makes the time for finding average target increase. Therefore, based on low dutycycle Wireless Sensor Network (WSN) by combining the ideology of virtual scan wave, the Multiple VIrtual Scan Algorithm (M-VISA) was proposed for road surveillance. This algorithm adopted the way of fixing points, deploying the same location with multinodes to let the nodes to be worked in order and in batches, hence, the network lifetime could be greatly extended. Simulation result demonstrates that M-VISA can prolong network lifetime by 180% when compared with VISA, improving the network performance effectively.

Key words: road monitoring, VIrtual Scanning Algorithm (VISA), fixed point, multi-node deployment, batches

摘要： 虚拟扫描算法不能充分利用节点数量，为了延长网络生命周期它必须建立在节点密集部署的基础上，以致平均目标发现时间延长。为此，基于低占空比无线传感器网络（WSN），结合虚拟扫描波的思想，提出一种用于道路监测的多重虚拟扫描算法。该算法通过定点、同位置多节点部署的方式，使节点依次分批工作，以延长网络生命周期。仿真实验表明，多重虚拟扫描算法与虚拟扫描算法相比网络生命周期延长了180%，能有效提升网络性能。

关键词: 道路监测, 虚拟扫描算法, 定点, 多节点部署, 分批次