利用移动数据收集器(mobile data collector,简称MDC)进行传感器网络中感知数据的收集,可以有效地减少传感器将数据发送到静止基站的传输跳数,节约网络的能量,延长网络寿命.此外,MDC通过循环收集传感器数据或承担数据转发的功能,避免节...利用移动数据收集器(mobile data collector,简称MDC)进行传感器网络中感知数据的收集,可以有效地减少传感器将数据发送到静止基站的传输跳数,节约网络的能量,延长网络寿命.此外,MDC通过循环收集传感器数据或承担数据转发的功能,避免节点间由于多跳传输引起的能量空洞(energy hole)以及节点失效造成的传输链路中断等问题.MDC的移动性也为无线传感器网络的研究带来新的挑战.研究基于移动协助数据收集的无线传感器网络结构,分类总结了近年来提出的一些典型的基于MDC的算法和协议,着重讨论了MDC在网络能量、延迟、路由和传输等方面带来的性能变化.最后,进行了各种算法的比较性总结,针对传感器网络中MDC的研究提出了亟待解决的问题,并展望了其未来的发展方向.展开更多
已有研究显示,可充电型无线传感器网络(RWSN)为解决传统网络中节点能耗不均衡等问题提供了新的思路。为了在移动充电器(MC)个数有限的情况下均衡网络中节点的剩余能量,提高网络的性能。提出了一种基于移动数据收集和移动充电相结合的全...已有研究显示,可充电型无线传感器网络(RWSN)为解决传统网络中节点能耗不均衡等问题提供了新的思路。为了在移动充电器(MC)个数有限的情况下均衡网络中节点的剩余能量,提高网络的性能。提出了一种基于移动数据收集和移动充电相结合的全网能量均衡机制Ms Mc EBP。Ms Mc EBP包括2个部分,即移动充电策略MCS和移动数据收集策略MDCS。在Ms Mc EBP中,首先将整个网络划分为若干个子区域,然后为每一个子区域分配一个MC。MC不仅担任充电器,还担任数据收集器。MCS旨在为网络中能量消耗较高的节点进行能量补充并且由MC收集各个区域的数据。MDCS旨在解决Sink如何从MC处收集数据。最后,对Ms Mc EBP进行了模拟仿真。仿真结果表明,Ms Mc EBP具有较好的性能,在网络寿命结束时,网络中所有节点的剩余能量都趋近于0。并且在数据精确度要求不高的情况下,Ms Mc EBP可以实现网络的永久运作。展开更多
To meet the requirement of high tracking angular accuracy for the acquisition, tracking, and pointing (ATP) subsystem of the free-space optical communication, and provide the basis for the further optical communicatio...To meet the requirement of high tracking angular accuracy for the acquisition, tracking, and pointing (ATP) subsystem of the free-space optical communication, and provide the basis for the further optical communication between maritime mobile platforms, the experimental system, which executing part for the fine tracking is voice coil motor with high frequency and good performance for error compensation, is established, and the whole system can be controlled by personal computer. A series of experiments has been done for the simulation target of different uniform speed, and the data of tracking error for fine tracking and coarse tracking are collected, analyzed and evaluateds separately, and the real-time optical power of communication laser is also collected. The result shows that standard deviation for ATP system tracking error increases with the increase of target speed, while the range of tracking error appears to be no order. Furthermore, communication link can be hold for a long time.展开更多
文摘利用移动数据收集器(mobile data collector,简称MDC)进行传感器网络中感知数据的收集,可以有效地减少传感器将数据发送到静止基站的传输跳数,节约网络的能量,延长网络寿命.此外,MDC通过循环收集传感器数据或承担数据转发的功能,避免节点间由于多跳传输引起的能量空洞(energy hole)以及节点失效造成的传输链路中断等问题.MDC的移动性也为无线传感器网络的研究带来新的挑战.研究基于移动协助数据收集的无线传感器网络结构,分类总结了近年来提出的一些典型的基于MDC的算法和协议,着重讨论了MDC在网络能量、延迟、路由和传输等方面带来的性能变化.最后,进行了各种算法的比较性总结,针对传感器网络中MDC的研究提出了亟待解决的问题,并展望了其未来的发展方向.
文摘已有研究显示,可充电型无线传感器网络(RWSN)为解决传统网络中节点能耗不均衡等问题提供了新的思路。为了在移动充电器(MC)个数有限的情况下均衡网络中节点的剩余能量,提高网络的性能。提出了一种基于移动数据收集和移动充电相结合的全网能量均衡机制Ms Mc EBP。Ms Mc EBP包括2个部分,即移动充电策略MCS和移动数据收集策略MDCS。在Ms Mc EBP中,首先将整个网络划分为若干个子区域,然后为每一个子区域分配一个MC。MC不仅担任充电器,还担任数据收集器。MCS旨在为网络中能量消耗较高的节点进行能量补充并且由MC收集各个区域的数据。MDCS旨在解决Sink如何从MC处收集数据。最后,对Ms Mc EBP进行了模拟仿真。仿真结果表明,Ms Mc EBP具有较好的性能,在网络寿命结束时,网络中所有节点的剩余能量都趋近于0。并且在数据精确度要求不高的情况下,Ms Mc EBP可以实现网络的永久运作。
基金supported by the Natural Science foundation of Hubei Province (No.2010CDB08502)
文摘To meet the requirement of high tracking angular accuracy for the acquisition, tracking, and pointing (ATP) subsystem of the free-space optical communication, and provide the basis for the further optical communication between maritime mobile platforms, the experimental system, which executing part for the fine tracking is voice coil motor with high frequency and good performance for error compensation, is established, and the whole system can be controlled by personal computer. A series of experiments has been done for the simulation target of different uniform speed, and the data of tracking error for fine tracking and coarse tracking are collected, analyzed and evaluateds separately, and the real-time optical power of communication laser is also collected. The result shows that standard deviation for ATP system tracking error increases with the increase of target speed, while the range of tracking error appears to be no order. Furthermore, communication link can be hold for a long time.
