基于高级在轨系统的虚拟信道技术研究--学位论文.doc

理工大学学士学位论文PAGE\*MERGEFORMATII摘要为了适应空间技术的发展，满足复杂航天器的数据处理需求，国际空间数据系统咨询委员会CCSDS开发了高级在轨系统AOS。AOS以标准化的方式进行数据处理与交换，能够在空间链路中双向传输音频、视频、科学实验等多种不同类型的数据。目前，AOS在航空航天技术领域中的作用越来越突出。AOS的核心技术之一是虚拟信道调度策略。合理的调度算法是保证AOS能够高效、有序的在同一物理信道上传输多种不同类型数据的关键。本文重点对AOS中虚拟信道调度算法进行研究。首先，对虚拟信道进行了严谨的分析，对信道的划分、包的研究都做了详细的研究，接着，对虚拟信道调度中的经典虚拟信道调度算法进行深度研究。最后，对传统的虚拟信道动态调度算法进行了分析研究，通过建立虚拟信道调度的仿真模型，分别研究了静态优先级算法，时间片轮转和先到先服务三种调度算法，最后对这些虚拟信道调度算法进行仿真实验，得到结果后进行了对比分析。关键词CCSDS；AOS；调度算法；虚拟信道AbstractInordertoadapttothedevelopmentofspacetechnology,tomeetthecomplexspacecraftdataprocessingneeds,CCSDSin1986developedadvancedorbitingsystem.AOSinastandardizedwayfordataprocessingandexchange,caninthespacelinkinavarietyofbidirectionaltransmissionofaudio,video,scientificexperimentdataofdifferenttypes.Atpresent,theAOSandroleinthefieldofaerospacetechnologyinmoreprominent.OneofthecoretechnologyofAOSisthevirtualchannelschedulingstrategy.RationalschedulingalgorithmistoguaranteethatAOScanbeefficient,orderlytransferkeytomanydifferenttypesofdatainthesamephysicalchannel.ThispaperfocusesonthestudyofvirtualchannelsinAOSschedulingalgorithm,themaincontentsinclude:first,Thevirtualchannelisstudied,andtheresearchonthechanneldivisionandpackagearebothintroducedindetail,then,wealsostudytheclassicalvirtualchannelschedulingalgorithminthevirtualchannelscheduling.Finally,thevirtualchannelschedulingalgorithmoftraditionalisanalyzed,throughcarryingoutthesimulationmodelfortheestablishmentofvirtualchannelscheduling,wedosomesimulationexperimentontheclassicalvirtualchannelschedulingalgorithm.Studythestaticpriorityalgorithm,timeslicerotationandfirstcomefirstservethreeschedulingalgorithms,andthenwemakethesimulationexperimentofthevirtualchannelschedulingalgorithm,theresultsobtainedarecomparedandanalyzed.Keywords:CCSDS;AOS;dispatchingalgorithm;VirtualchannelPAGE\*MERGEFORMATIII目录TOC\o"1-3"\h\uHYPERLINK\l"_Toc359152711"1绪论PAGEREF_Toc359152711\h1HYPERLINK\l"_Toc359152712"1.1课题研究的背景和意义PAGEREF_Toc359152712\h1HYPERLINK\l"_Toc359152713"1.2国内外研究现