In order to increase the aircraft＇s survival in the flight mission, it is necessary to carry out flight mission planning, which includes TF/TA2（ terrain following/terrain avoidance/threat avoidance）. An approach to...In order to increase the aircraft＇s survival in the flight mission, it is necessary to carry out flight mission planning, which includes TF/TA2（ terrain following/terrain avoidance/threat avoidance）. An approach to 3D-route planning based on A ＊ heuristic search algorithm was selected to determine the routes of fiber optic guidance missile＇ s cruise segment. The cost function was discussed, which was mainly related to the physical obstacle, threat exposure, and aircraft performance characteristics. The digital map techniques were presented, which included setting ＂no-go＂ area according to fiber＇s safety requirement. The optimal or the sub-optimal route was obtained, while the cost function constraints were satisfied and the stored terrain obtained from a real terrain was digitized. The algorithm is validated through simulation and can fulfill the route planning task which focuses on the cruise segment of fiber optic guidance missile.展开更多
With the rise of cloud computing in recent years, a large number of streaming media has yielded an exponential growth in network traffic. With the now present 5G and future 6G, the development of the Internet of Thing...With the rise of cloud computing in recent years, a large number of streaming media has yielded an exponential growth in network traffic. With the now present 5G and future 6G, the development of the Internet of Things (IoT), social networks, video on demand, and mobile multimedia platforms, the backbone network is bound to bear more traffic. The transmission capacity of Single Core Fiber (SCFs) may be limited in the future and Spatial Division Multiplexing (SDM) leveraging multi-core fibers promises to be one of the solutions for the future. Currently, Elastic optical networks (EONs) with multi-core fibers (MCFs) are a kind of SDM-enabled EONs (SDM-EON) used to enhance the capacity of transmission. The resource assignment in MCFs, however, will be subject to Inter-Core Crosstalk (IC-XT), hence, reducing the effectiveness of transmission. This research highlights the routing, modulation level, and spectrum assignment (RMLSA) problems with anycast traffic mode in SDM-EON. A multipath routing scheme is used to reduce the blocking rate of anycast traffic in SDM-EON with the limit of inter-core crosstalk. Hence, an integer linear programming (ILP) problem is formulated and a heuristic algorithm is proposed. Two core-assignment strategies: First-Fit (FF) and Random-Fit (RF) are used and their performance is evaluated through simulations. The simulation results show that the multipath routing method is better than the single-path routing method in terms of blocking ratio and spectrum utilization ratio. Moreover, the FF is better than the RF in low traffic load in terms of blocking ratio (BR), and the opposite in high traffic load. The FF is better than the RF in terms of a spectrum utilization ratio. In an anycast protection problem, the proposed algorithm has a lower BR than previous works.展开更多
为解决传统通信机房和数据中心中光配线架光纤跳线布线不规范、光缆冗余过多的问题,提出一种光纤配线路由智能排查系统。首先,采用高性能、低成本的微型控制器STM32芯片控制光收发系统,通过电-光-电信号的数据收发实现光纤配线路由排查...为解决传统通信机房和数据中心中光配线架光纤跳线布线不规范、光缆冗余过多的问题,提出一种光纤配线路由智能排查系统。首先,采用高性能、低成本的微型控制器STM32芯片控制光收发系统,通过电-光-电信号的数据收发实现光纤配线路由排查;然后,设计基于通用运算放大器LM358、中继技术进行定量放大和中继处理;最后,采用Opti System软件对系统的性能进行仿真测试。测试结果表明:系统的动态范围最大达到9.24 d B,能实现光纤传输距离为46 km的排查功能;同时,系统中再生信号的质量得到了提高,能有效延长系统传输距离。展开更多
分布式铁路光纤传感网受光器件、光纤连接损耗及封闭式传输架构限制,检测点数少,不易于与其它网络融合。而基于物联网技术的光纤无线传感网络可实现大规模、可扩充的现代分布式铁路光纤无线传感网络。为降低光纤无线传感网中传感器节点...分布式铁路光纤传感网受光器件、光纤连接损耗及封闭式传输架构限制,检测点数少,不易于与其它网络融合。而基于物联网技术的光纤无线传感网络可实现大规模、可扩充的现代分布式铁路光纤无线传感网络。为降低光纤无线传感网中传感器节点能耗,研究了传统的低功耗自适应分簇(Low Energy Adaptive Clustering Hierarchy,LEACH)路由算法,针对该算法引起的"能量空洞"与"网络热点"问题,基于二重异构网络,进行了路由算法的改进研究。实验结果表明,改进的路由算法能显著降低传感器节点能耗,延长其使用寿命。展开更多
基金Sponsored by the Ministerial Level Advanced Research Foundation(51401050105BQ01)
文摘In order to increase the aircraft＇s survival in the flight mission, it is necessary to carry out flight mission planning, which includes TF/TA2（ terrain following/terrain avoidance/threat avoidance）. An approach to 3D-route planning based on A ＊ heuristic search algorithm was selected to determine the routes of fiber optic guidance missile＇ s cruise segment. The cost function was discussed, which was mainly related to the physical obstacle, threat exposure, and aircraft performance characteristics. The digital map techniques were presented, which included setting ＂no-go＂ area according to fiber＇s safety requirement. The optimal or the sub-optimal route was obtained, while the cost function constraints were satisfied and the stored terrain obtained from a real terrain was digitized. The algorithm is validated through simulation and can fulfill the route planning task which focuses on the cruise segment of fiber optic guidance missile.
文摘With the rise of cloud computing in recent years, a large number of streaming media has yielded an exponential growth in network traffic. With the now present 5G and future 6G, the development of the Internet of Things (IoT), social networks, video on demand, and mobile multimedia platforms, the backbone network is bound to bear more traffic. The transmission capacity of Single Core Fiber (SCFs) may be limited in the future and Spatial Division Multiplexing (SDM) leveraging multi-core fibers promises to be one of the solutions for the future. Currently, Elastic optical networks (EONs) with multi-core fibers (MCFs) are a kind of SDM-enabled EONs (SDM-EON) used to enhance the capacity of transmission. The resource assignment in MCFs, however, will be subject to Inter-Core Crosstalk (IC-XT), hence, reducing the effectiveness of transmission. This research highlights the routing, modulation level, and spectrum assignment (RMLSA) problems with anycast traffic mode in SDM-EON. A multipath routing scheme is used to reduce the blocking rate of anycast traffic in SDM-EON with the limit of inter-core crosstalk. Hence, an integer linear programming (ILP) problem is formulated and a heuristic algorithm is proposed. Two core-assignment strategies: First-Fit (FF) and Random-Fit (RF) are used and their performance is evaluated through simulations. The simulation results show that the multipath routing method is better than the single-path routing method in terms of blocking ratio and spectrum utilization ratio. Moreover, the FF is better than the RF in low traffic load in terms of blocking ratio (BR), and the opposite in high traffic load. The FF is better than the RF in terms of a spectrum utilization ratio. In an anycast protection problem, the proposed algorithm has a lower BR than previous works.
文摘为解决传统通信机房和数据中心中光配线架光纤跳线布线不规范、光缆冗余过多的问题,提出一种光纤配线路由智能排查系统。首先,采用高性能、低成本的微型控制器STM32芯片控制光收发系统,通过电-光-电信号的数据收发实现光纤配线路由排查;然后,设计基于通用运算放大器LM358、中继技术进行定量放大和中继处理;最后,采用Opti System软件对系统的性能进行仿真测试。测试结果表明:系统的动态范围最大达到9.24 d B,能实现光纤传输距离为46 km的排查功能;同时,系统中再生信号的质量得到了提高,能有效延长系统传输距离。
文摘分布式铁路光纤传感网受光器件、光纤连接损耗及封闭式传输架构限制,检测点数少,不易于与其它网络融合。而基于物联网技术的光纤无线传感网络可实现大规模、可扩充的现代分布式铁路光纤无线传感网络。为降低光纤无线传感网中传感器节点能耗,研究了传统的低功耗自适应分簇(Low Energy Adaptive Clustering Hierarchy,LEACH)路由算法,针对该算法引起的"能量空洞"与"网络热点"问题,基于二重异构网络,进行了路由算法的改进研究。实验结果表明,改进的路由算法能显著降低传感器节点能耗,延长其使用寿命。
