共查询到20条相似文献,搜索用时 77 毫秒
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单架机载预警雷达探测目标时存在空域覆盖盲区和多普勒盲区。建立了巡逻航线的参数化模型,推导了机载预警雷达目标发现概率计算模型;提出了基于累积发现概率矩阵2-范数的单架机载预警雷达巡逻航线优化准则。由于多架机协同可以减小盲区对探测性能的影响,进一步研究了多架机协同探测的任务航线规划问题,提出了优化准则,分析了机载预警雷达之间的飞行时间间隔和航线之间的距离间隔对重点监视区域累积发现概率的影响。仿真结果表明了基于累积发现概率矩阵2-范数的优化准则的有效性,有利于最大化机载预警雷达空域覆盖和目标发现概率。 相似文献
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利用协同软件进行协同计算时,由于协同计算资源的异构体系、传输带宽与延迟等诸多因素的影响,使得将协同计算中需要相互通信的相关联的任务分配到协同计算资源变得十分困难,因而考虑时间和费用最优平衡的资源调度算法成为关系协同软件可用性的关键.为此,提出一种基于时间和费用平衡的资源调度仿真算法,同时考虑了协同任务之间的相关性,通过应用验证了仿真算法的有效性. 相似文献
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孙晓闻 《中国电子科学研究院学报》2014,9(4)
无人机将是今后重点发展的武器装备,而无人机和有人机协同探测/作战将是其典型应用方式.介绍了国外无人/有人机协同探测/作战的发展概况,对无人机间的协同探测、无人机与预警机协同探测和无人机与战斗机的协同作战等模式进行了探讨,分析了各协同方式对无人机平台的能力需求.通过协同探测/作战,大大扩展了无人机的使用范围,提升了信息感知能力. 相似文献
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多架无人作战飞机协同作战的几个关键问题 总被引:13,自引:6,他引:7
从分析协同空战对无人作战飞机(UCAV)的要求入手,初步探讨了UCAV多机协同与有人驾驶战斗机多机协同的区别,分析了UCAV多机协同面临的主要问题,阐述了UCAV多机协同的关键技术以及将来可能的应用,指出了UCAV多机协同的研究方向。 相似文献
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In relay-assisted cooperative com-munication, relay nodes help forwarding the information of a source node in case of link failure between the source and a destination. Although user cooperation improves the over-all efficiency of the network, it requires incen-tive to stimulate potential relay nodes to assist the source by forwarding its data to the desti-nation. Moreover, the potential relays are bet-ter informed than the source about their chan-nel conditions to destination, which results in asymmetric information between the source and the relays. In this paper, we study the problem of lack of forwarding incentive in cooperative communication when channel state information of relays is private infor-mation and not known by the source. To tackle this problem, we apply the principle of contract theory to a cooperative wireless system. Source first designs incentive compatible and individually rational contract, consisting of a set of power-credit pairs. Then it broadcasts contract items to nearby nodes. Once the source node receives reply messages from the volunteer relays, it chooses one or more relays based on its re-quirements and communication starts. Simulation results show how credit assignment works in order to stimulate relays to cooperate and prevents relays from cheating behavior. 相似文献
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Mugen Peng Qianqian Zhang Wenbo Wang 《International Journal of Communication Systems》2008,21(12):1285-1306
A hierarchical convergence mechanism for the heterogeneous wireless communication system via the heterogeneous cooperative relay node is presented in this paper, in which the techniques of cooperative communication and wireless relay are utilized to improve performances of the individual user and the overall converged networks. In order to evaluate the benefits of the proposal, a utility-based capacity optimization framework for achieving the heterogeneous cooperative diversity gain is proposed. The heterogeneous cooperative capacity, relay selection and power allocation theoretical models are derived individually. The joint optimization model for relay selection and power allocation is presented as well. Owing to the computation complexity, the sub-optimal cooperative relay selection algorithm, the sub-optimal power allocation algorithm and the sub-optimal joint algorithm are determined to approach the maximum overall networks' spectrum efficiency. These proposed algorithms are designed in conformance to guarantee the equivalent transmission rates of the different wireless access networks. The simulation results demonstrate that the utility-based capacity model is available for the heterogeneous cooperative wireless communication system, and the proposed algorithms can improve performances by achieving the cooperative gain and taking full advantage of the cross-layer design. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
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考虑蜂窝移动通信系统中大尺度衰落对协作分集技术的影响,提出根据大尺度衰落相关性来选择协作伙伴。以距离和终端所处的地理环境为依据,建立了蜂窝移动通信系统中阴影衰落的相关模型,求出各终端间的相关系数,选择相关系数最小的作为协作伙伴。从理论上对由此形成的协作通信系统进行了分析,可以提高信道容量,降低误码率。仿真结果进一步验证了该方法的可行性。 相似文献
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空间分集与编码调制技术相结合的空时编码技术,可以获得分集和编码增益,具有优异的抗衰落性能。传统空时编码和多输入多输出(MIMO)技术是通过多天线来实现空间分集的,但是由于移动台的尺寸和载频的限制,使多天线技术很难实现。基于复杂系统自组织MIMO无线传输分集和编码技术成为解决这一问题的可选方案,并且无需通过信道反馈信息,动态分配资源,提高了端到端的通信服务质量(QoS)和信道容量。 相似文献
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多无人机协同搜索是多无人机协同控制的重要内容之一,无人机协同搜索的两大问题是通讯延迟和分布式的计算环境。各无人机既要提高搜索效率又要避免碰撞。提出了一种以分布式模型预测算法为基础的搜索算法。通过引入合适的缓冲周期,安排不同的无人机分别对未来不同的时间范围进行规划。不同无人机的搜索规划在时间上不再耦合,从而解决了多机分布式计算和通讯延迟的问题。该方法的目的是实现真实环境下的分布式协同控制。最后用仿真算例验证了算法的可行性。 相似文献