【作者】 向睿；

【导师】 李岳；

【作者基本信息】 国防科学技术大学 ， 机械工程， 2009， 硕士

【摘要】 在轨卫星系统的正常运行主要依靠高可靠性和冗余保证,但在真空、失重、高低温、强辐射且充满未知因素的太空环境下长期运行,不可避免会出现系统故障。对于在轨卫星来说,为了避免某些单机部件发生故障而引起整个系统瘫痪,必须在故障发生时迅速予以隔离修复,维持系统功能正常,保证其安全可靠地完成任务。由于卫星系统的设计、制造与运行管理相对独立,故障出现时需要不同部门的人员进行联合故障决策。显然,在这种背景下,依靠以人员现场交流方式实施的卫星故障诊断难以满足航天事业发展的技术需求。为此,开展在轨卫星远程诊断技术研究,实现卫星诊断信息及专家知识的共享与实时交互,对于提高卫星测试诊断能力具有重要意义。本文以某型卫星为研究对象,对在轨卫星远程诊断关键技术展开研究,主要研究内容包括以下几个方面:1.以某型卫星姿控系统为具体对象,在系统地分析其诊断需求的基础上,提出了在轨卫星远程诊断体系整体构架,划分了系统功能层次模型,设计了以B/S模式为主,C/S相结合的系统网络结构。2.研究了多信号模型技术在卫星系统诊断建模中的应用,基于TEAMS环境建立了某卫星姿控分系统多信号诊断模型,研究了基于遥测参数的实时诊断算法并提出了改进思路,设计了基于决策树遍历算法的远程专家交互系统。3.研究了支持远程诊断的网络技术,以SQL Server 2005为平台设计了诊断系统数据库与知识库,运用ADO.NET技术实现了数据库访问,基于ASP.NET技术实现了系统网络平台设计。4.综合运用所研究的关键技术,开发和实现了在轨卫星远程诊断系统各功能模块。在局域网范围内以某卫星姿控分系统为例,模拟实现和验证了在轨卫星远程诊断系统的数据远程传输、实时状态监控、故障实时诊断、数据库远程访问、远程交互诊断等功能。更多还原

【Abstract】 The reliabilities of satellites are relatively high because of redundant designs. However, after running several years, the in-orbit satellite is very likely to suffer system failures due to harsh outer space environment factors, such as, vacuum, high temperature, strong radiation and even some other unknown factors. For in-orbit satellite, in order to avoid catastrophic system failure caused by of component faults, the faults must be isolated and repaired as quickly as possible, so that the system functions can resume normal, and the satellite can complete its mission safely and reliably. Since the design, manufacturing and running managements of satellite system are relatively independent of each other, when a fault occurs, it needs timely joint decision-making by technicians from different departments. Obviously, in such background, the way of satellite diagnostic depends on personnels’manual communication cannot meet the requirements of space technology development. Therefore, it is of great significance in carrying out research on in-orbit satellite remote diagnostic technology, which can set up an effective way of diagnostic information sharing and interaction to replace the manual knowledge exchange process of technical personnel, through which the capabilities of satellite test and diagnosis can be improved greatly.In this thesis, taking an in-orbit satellite system as the research object, researches on key technologies of satellite remote diagnostic are carried out. The main contents are as follows:1. After systematically analyzing of the diagnostic requirements of the satellite attitude control subsystem, the architecture of in-orbit satellite remote diagnostic system is proposed. A system functions hierarchical model is put forward, and the system network structure based on B/S and C/S mode is designed.2. The principles and implementation steps of fault modeling method based on multi-signal model method are introduced, and the multi-signal diagnostic model of the attitude control subsystem is built via TEAMS software. A real-time diagnosis algorithm based on remote sensing parameters is introduced and some ideas to improve it are put forward. An expert diagnostic interactive system based on ergodic algorithm of decision tree is designed.3. The network-related technology that supporting remote diagnosis is analyzed. The fault database and knowledge base is designed using SQL Server2005 software, and the database accessing is implemented by ADO. NET technology. Based on ASP. NET technology, the design of system network platform is achieved.4. At last, based on the researched key technologies, the functional modules of in-orbit satellite remote diagnostics system is developed and implemented. By taking an example of the satellite attitude control subsystem in LAN network, the functions of this remote diagnosis system such as remote data transfer, status monitoring, real-time diagnosis, data access and remote interactive diagnosis are achieved and verified.更多还原