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

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...

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

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 flexible and scalable networking model may be performed.The hardware platform is composed of 1 rotor,6 servo mechanisms,6 optical wireless communication terminals and 6 control mechanisms of automatic tracking.It can model maintaining,data relaying and bi-directional 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-layered 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.