Research Advance of Target Tracking with Mobile Elements in Heterogeneous Wireless Sensor Networks

传统固定无线传感器网络在进行目标跟踪过程中面临跟踪质量较低、网络能耗较高等问题.引入移动节点后所组成的异构无线传感器网络提供了新的解决方法,即移; 动式目标跟踪.目前的研究大多对被跟踪目标的探测和定位混为一谈,本文区分了以探测为主和以定位为主的两类方法,着重介绍以探测为主的移动式目标跟踪方法; 的研究现状.通过对比现有方法在跟踪质量和网络能耗等方面的优缺点,揭示了现有研究存在的问题.总结了移动式目标跟踪领域存在的研究热点和趋势.Traditional stationary wireless sensor networks usually encounter some; problems during the process of target tracking,such as low tracking; quality, high energy consumption and so on. More and more mobile; elements, i. e., mobile sensors, are used to build up heterogeneous; wireless sensor networks and thus bring new solutionsfor target; tracking. Existing researches usually misidentify detecting the target; with locating the target. After distinguishing between detection-centric; and localization-centric methods,we review specifically the current; research status of the detection-centric target tracking methods. By; comparing existing methods'merit and demeritin aspects like tracking; quality, energy consumption, etc.,their problems are revealed.; Therefore, we summarize some possible research hotspotsand tendency of; mobile solutions in many aspects.国家自然科学基金重点项目; 国家科技支撑计划项目; 国家自然科学基金项目; 福建省自然科学基金计划项

Survey on Connectivity with Mobile Elements in WSNs

节点连通性是无线传感器网络研究的热点问题之一,然而由于节点能量耗尽、硬件故障以及通信链路失效等问题的存在,造成网络分割,因此如何确保网络连通成为; 无线传感器网络亟待解决的关键性问题.近年来,一个新的研究趋势是通过引入计算能力较强且能量较为充足的移动性节点来进行连通控制,提高无线传感器网络的; 整体性能.本文对目前利用移动性节点的主流连通控制方法进行了充分调研,通过对这些方法的详细分类和比较,归纳了移动式连通控制的各类方法的特点,分析了; 这些方法的性能和适用范围,总结了研究中存在的主要问题与挑战,并指出了未来可能的研究方向.The connectivity of sensors is one of the main research problems in; wireless sensor networks (WSNs).Data can be forwarded through connected; sensor nodes.However,becauseof energy depletion,hardware failure and; communication link failure,the network may be partitioned.How to; guarantee the connectivity becomes an urgent issue in wireless sensor; networks.Traditional work usually focuses on maximizing the connectivity; with minimum sensors.In recent years,a new research trend is to utilize; mobile elements for connectivity control.Since the mobile element is; more powerful than normal sensors,it improves the performance of many; aspectsin wireless sensor networks.In this paper,we makea comprehensive; investigation about the current major connectivity control methods with; mobile elements.We first summarize the characteristics of mobile; topology control methods via a new classification.Based on the; classification,these methods are compared to each other according to a; serial parameters.Finally,we analyze the performances and the; application scopes of these methods,summarize the main problems,and; point out the future research directions.国家"九七三"重点基础研究发展计划项目; 国家科技支撑计划项目; 国家自然科学基金项目; 福建省科技计划重点项目; 福建省自然科学基金计划项

Survey on Coverage Control with Mobile Elements in Wireless Sensor Networks

在无线传感器网络中,节点能量限制、硬件以及通信链路故障等问题,造成网络空洞的产生且影响了网络的正常运作,因此如何确保网络覆盖率成为传感器网络中需; 要解决的重要问题.近年来,通过引入移动节点来进行覆盖控制,提高传感器网络的覆盖率成为一个新的研究趋势.本文通过充分调研利用移动节点进行网络覆盖控; 制的方法,并对其进行了分类和比较,归纳了移动式网络覆盖的各种方法的特点,分析这些方法的性能和适用范围,总结存在的主要问题,并指出未来的研究方向.Due to the existence problems of energy depletion,hardware failure and; communication link failure and so on,which causes network holes and; affects the normal network operation. The insurance of coverage becomes; an urgent issue in wireless sensor networks. In recent years, a new; research trend is to utilize mobile nodes for coverage control, which; increases the coverage of wireless sensor networks. In this paper, we; have a comprehensive investigation about the current major topology; control methods with mobile nodes,and summarize the characteristics of; mobile topology control methods via classification and comparison of; these methods. Finally,we analyze the performances and the application; scopes of these methods, summarize the main problems,and point out the; future research directions.国家自然科学基金重点项目; 国家科技支撑计划项目; 国家自然科学基金项目; 福建省科技计划重点项