星上ATM交换卫星通信系统的关键技术研究
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摘要
星上处理(OBP)被认为是先进卫星通信技术发展的重要方向;异步转移模式
    (ATM)被认为是未来通信网络的核心技术,因此,将这两种技术结合起来,为广
    域范围内的地面用户提供宽带综合业务,则是令人感兴趣的一个热点,并且有着重要
    的意义。
     本文介绍了作者在星上ATM交换和将这种技术用于多波束卫星通信系统方面所
    做的研究工作。这项研究得到了军事电子预研基金项目“实现全国军用网互连的一
    种交换新体制”的支持和资助。
     论文的研究工作获得了下述带有创见性的研究成果,它们是:
     (1)提出了能够满足星上ATM交换卫星通信系统要求的多址接入方式和调制
    解调方案,并论证了它们的可行性与有效性。
     (2)提出了适合星上ATM交换的链路编码方案;研究了卫星链路传输ATM信
    元的编码方法,并对所提编码方法的性能进行了详细地分析。
     (3)为星上ATM交换卫星通信系统的同步提出了有效的解决方案;分析了该
    方案的同步精度。此外,还研究了实现链路按需分配多址接入(DAMA)和子帧带
    宽ATM统计复用的具体方法。
     (4)依照星上ATM交换的特点与要求,提出了ATM交换卫星网络的通信协议
    和内部信元格式;研究了星上ATM交换机的组成结构与输入输出接口;设计了采用
    32位数据总线宽度和8×8总线交换结构的星载40×40ATM自路由交换机,并详细
    研究了该交换机的总线定时与控制问题。
     (5)对实现星上ATM交换拥塞控制的方法进行了仔细研究;根据卫星链路传
    输时延长的特点,确定了输出缓冲器的拥塞判别门限和不产生信元丢失的缓冲容量;
    在此基础上,提出一种称为后向广播反馈与链路通道流量控制的拥塞控制算法。
     此外,通过使3台PC机的RS-232C串行口的互连,构成了一个模拟3×3星上
    ATM基本交换功能的试验系统。
     对于未来实现星上ATM交换卫星通信系统而言,论文的研究成果将会是颇为有
    用的和富于参考价值的。
On-board processing (OBP) is believed to be a very important direction of developing
     advanced communication satellite technology ; asynchronous transfer mode (ATM)is considered
     as the key core technology in the coming communication networks. Therefore, it would be very
     interesting and significant to combine OBP and ATM, providing communications of broadband
     integrated service for a very wide area. This dissertation introduces the author research about on
     board ATM switching techniques as well as a scheme of such satellite communication system. The
     research is supported by a project of Military Electronic Research Foundation ?揂 new
     Switching system of realizing interconnection of the national military networks?
    
     The dissertation has obtained several original results in the research of the ATM switching
     satellite communication, these results are follow as:
    
     1) Proposing a reasonable multi梐ccess mode and modem approach for on梑oard ATM
     switching satellite communication system.
    
     2) Proposing a suitable coding scheme for on--board ATM switching and studying a novel
     coding method for ATM cell transmission via satellite links.
    
     3) Providing an effective solution for the system synchronization, and presenting some
     approaches used to bandwidth assignment of links or channels.
    
     4) Based on the detail examination of various related issues, a 40X40 on梑oard ATM switch
     is designed, including discussion of timing and control for switch.
    
     5) Proposing a control algorithm for reducing congestion of on梑oard ATM switching called
     as the backward broadcast feedback and link channels flow control.
    
     Besides, a simulation system to demonstrate the function of 3X3 ATM switching is built, by
     using 3 PC computers whose RS-232C series interfaces are connected with each other.
    
     The research results of the dissertation would be a very useful reference for implementation of
     building such a communication system in future.
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