低中轨道双层卫星光网络的分时切换半实物仿真演示系统  

An asynchronous handover model demonstration for a double-layered optical satellite network of LEO/MEO

作　　者：李勇军[1] 赵尚弘[1] 吴继礼[1] 马丽华[1] 

机构地区：[1]空军工程大学电讯工程学院,陕西西安710077

出　　处：《光电子．激光》2011年第10期1515-1521,共7页Journal of Optoelectronics·Laser

基　　金：国家高技术研究发展"863"计划资助项目(2007AA01Z294)

摘　　要：为精确模拟验证低中轨道(LEO/MEO)双层卫星光网络及其关键技术,按1∶30的比例设计了分时切换双层卫星光网络半实物实验演示系统。系统包括计算机仿真环境和硬件平台两部分,通过SITL模块互联而成。软件部分由虚拟网络组成,实现灵活、可扩展的配置;硬件平台由1个圆形往复转台、6个伺服机构、6个无线激光通信终端和6组自动追踪控制机构组成,可实现自动追踪、自动对准以及双向切换。系统可模拟MEO卫星和LEO卫星间星际光链路的(OIOL)稳定、切换以及数据中继等功能,演示验证LEO/MEO双层卫星光网络路由等关键技术。实验结果表明,切换极大地影响双层网络性能,且双层结构网络时延由于卫星切换而周期性波动,平均时延为69.19ms,峰值为69.89ms,较单层结构能改善3.96ms。In order to accurately demonstrate the double-layered optical satellite network of LEO/MEO and key technologies, a hardware-in-the-loop model system of asynchronous handover optical satellite network is designed in the scale of 1 ： 30. The system is composed of software simulation environment and hardware platform. These two parts are connected by the system-in-the-loop （SITL）. The software part consists of virtual networks,in which flexihle and scalable networking model may be performed. The hardware platform is composed of 1 rotor,6 servo mechanisms,6 optical wireless communication termi- nals and 6 control mechanisms of automatic tracking. It can model maintaining,data relaying and hi-di- rectional handovers of optical inter-orbit links between MEO satellite and LEO satellite. The routing in double-layered optical satellite network can be demonstrated. Experiment results show that the handover affects the delay performance of double-layered network extremely. Moreover, the delay of double-lay- ered network changes periodically because of the handover. The average network delay is 69.19 ms,and the maximal delay is 69.89 ms,lower than that of the single-layered network by 3.96 ms.

关 键 词：光通信 卫星通信 双层卫星光网络 星际光链路(OIOL) 半实物仿真 

分 类 号：TN929.1[电子电信—通信与信息系统]