机间数据链核心问题的分析与探讨

指出了机间数据链的重要性,阐述了低传输延迟特性、高数据传输率、低截获率、高抗干扰能力、动态组网等特征对系统的要求.对频率选择、窄带多波束天线设计、信道接入协议等核心问题进行了较深入的分析,指出了解决方案和途径,并讨论了建立网络协议开发平台的意义及方法.     

一种用于数据链自组网的MAC协议

战争形式的转变推动了数据链组网技术的转变,最新一代的数据链开始采用自组网技术,这也代表了数据链未来的发展方向。MAC协议是数据链自组网的关键技术之一,数据链自组网的MAC协议急需提高抗干扰能力和安全性,增强对突发业务的支持,据此,提出了HPRMA协议。在此对协议的跳频处理增益和抗转发式干扰的效能进行了分析,论证了协议的高抗干扰能力和可实现性。通过仿真,验证了该协议对突发业务的支持。     

一种数据链协议与建模仿真

介绍了一种数据链TDMA(时分多址)无线组网协议机制,讨论了如何利用OPNET工具建立此无线组网协议模型的过程,通过构建一个网络仿真平台对入网、中继和广播等情况进行了仿真,对协议的可实现性以及网络时延、吞吐量等进行了分析,验证了TDMA无线组网协议的有效性。     

航空信号情报传感器组网侦测技术

信号情报传感器组网侦测技术对于无源探测系统提高传感器侦测能力和在对高速运动目标的瞬时定位方面有非常显著的意义。在对国外传感器组网发展状态进行介绍的基础上详细阐述了航空信号情报传感器利用卫通链路和通用战术数据链进行机器-机器组网的关键技术以及多平台目标关联模型,最后给出了航空信号情报传感器利用通用战术数据链进行机器-机器组网的应用效果。     

基于定向数据链组网的仿真验证技术研究

针对传统单一的仿真手段已不能满足定向组网协议仿真验证需求的问题,综合利用STK、OPNET和MATLAB 等多种仿真平台,提出了一种基于定向数据链组网的综合仿真验证方法,并对典型的定向数据链网络进行了建模仿真,并针对定向组网的重要特征进行了仿真验证,得到了一系列仿真验证结果.仿真验证结果表明,该仿真验证技术可靠有效,对定向数据链网络的发展具有一定的参考意义.     

基于定向天线技术的机间数据链DP-CLMA协议

机间数据链中使用定向天线技术能充分利用定向数据传输良好的隐蔽性、抗干扰性和抗截获性,但同时也带来一些难点问题.提出一种基于定向天线技术的机间数据链多址接入协议——动态优先级链式多址接入( Dynamic Priority-Chain Link Multiple Access,DP-CLMA)协议.针对难点问题,给出协议...     

一种机间数据链的设计方法

提出了一种协同攻击机间互联数据链(IDL)的设计方法,对机间数据链的传输方式、传输周期、传输内容、传输时序等进行了研究.     

多链统一集成接入设计

本文提出一种多数据链接入方法,以进行多信道、组网协议和消息标准的兼容、多数据链综合监控及业务综合分发处理,统一业务处理流程,简化指控系统与数据链接口关系,并通过综合业务复接简化系统引接。     

PoS技术及其发展状况

详述了与 Po S技术紧密相关的两方面内容 :一是数据封装协议 ,包括点对点协议、高层数据链路控制协议以及引伸而来的简化数据链路协议 ,直到多协议标记交换的出现 ;二是高速路由技术 ,文中分别说明了所采用的各种先进技术。最后举例说明 Po S组网结构并概述发展状况。     

战术TDMA网络分析与研究

数据链作为新军事变革中军事信息装备的重要组成部分,其应用水平在很大意义上决定着信息化战争的水平。TDMA协议是目前战术数据链采用的主流组网协议之一。以战术TDMA网络为背景,主要从技术特点和体系结构方面介绍了LINK-16,LINK-22和EPLRS三种TDMA网络,另外,也对当前存在的其他一些战术TDMA网络做了简单概括。     

机间数据链中级联码OFDM系统的抗干扰研究

为满足信息传输实时可靠、频谱使用高效灵活等技战术需求,在机间数据链(Intra-Flight Data Link,IFDL)物理层采用了多载波正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)传输体制。针对其抗干扰性能不足的问题,在突发干扰下对系统可靠性理论分析的同时,采用NASA提出的(255,223)Reed Solomon(RS)-(2,1,7)卷积"标准级联码",并与符号卷积交织相结合构成了前向纠错(Forward Error Correction,FEC)级联码方案。仿真结果表明,级联码OFDM系统在一定误码率下、不同IFDL信道环境中,均可获得较高编码增益,从而有效增强了机间数据链OFDM系统可靠性。此外,通过机载定向天线低截获传输,在保证隐蔽性的同时可进一步抑制多径衰落及跟踪干扰。     

Implementing network protocols at user level

Traditionally, network software has been structured in a monolithic fashion with all protocol stacks executing either within the kernel or in a single trusted user-level server. This organization is motivated by performance and security concerns. However, considerations of code maintenance, ease of debugging, customization, and the simultaneous existence of multiple protocols argue for separating the implementations into more manageable user-level libraries of protocols. The present paper describes the design and implementation of transport protocols as user-level libraries. The authors begin by motivating the need for protocol implementations as user-level libraries and placing their approach in the context of previous work. They then describe their alternative to monolithic protocol organization, which has been implemented on Mach workstations connected not only to traditional Ethernet, but also to a more modern network, the DEC SRC AN1. Based on the authors' experience, they discuss the implications for host-network interface design and for overall system structure to support efficient user-level implementations of network protocols     

网络化作战C~2组织设计与应用研究

指挥控制(C2)组织的设计与应用是实现网络中心战的核心技术之一。从分析传统C2组织难以满足未来网络化作战的需求出发,提出了网络化条件下C2组织的设计需求和应用需求,详细描述了网络化作战C2组织设计的设计流程以及组织应用中的关键技术,最后归纳出网络化作战C2组织设计与应用研究的整体框架。     

Design space exploration of non-uniform cache access for soft-error vulnerability mitigation

In this paper, the design space exploration problem is concerned with finding the best composition of different Non-Uniform Cache Access (NUCA) specifications in many-core processors. The single-objective and multi-objective exploration problems are intended to meet the desired level of reliability without violating the performance and energy constraints. The main objective is to find the best choice for each cache specification which can minimize the vulnerability of L1 and L2 caches in NUCA architectures. The design space consists of 72 implementations, made up of combinations of different structures in the current NUCA specifications (cache organization, write policy, coherence protocol, inclusiveness, replacement policy, and network topology). Moreover, the effects of design implementations on reliability (as the main objective), performance, cache energy consumption, and interconnection traffic (as the constraints) have been investigated.     

The Desktop Computer as a Network Participant

A desktop personal computer can be greatly extended in usefulness by attaching it to a local area network and implementing a full set of network protocols, just as one might provide for a mainframe computer. Such protocols are a set of tools that allow the desktop computer not just to access data elsewhere, but to participate in the computing milieu much more intensely. There are two challenges to this proposal. First, a personal computer may often be disconnected from the network, so it cannot track the network state and it must be able to discover and resynchronize with that state very quickly. Second, full protocol implementations have often been large and slow, two attributes that could be fatal in a small computer. This paper reports a network implementation for the IBM Personal Computer that uses several performance-oriented design techniques with wide applicability: an upcall/downcall organization that simplifies structure; implementation layers that do not always coincide with protocol specification layers; copy minimization; and tailoring of protocol implementations with knowledge of the application that will use them. The size and scale of the resulting package of programs, now in use in our laboratory for two years, is quite reasonable for a desktop computer and the techniques developed are applicable to a wider range of network protocol designs.     

HDLC协议处理芯片在微机查号系统中的应用

在目前的数字通信系统或网络设计中,普遍采用了HDLC协议,该协议是在同步网上传输数据时需要遵守的数据链路层协议,也是一种面向比特位的数据链路控制协议。HDLC协议的实现方式有两种,分别是软件实现和硬件实现。本文介绍了HDLC协议的特点,采用硬件实现的方法,及采用HDLC协议处理芯片MT8952B设计和实现了在微机查号系统中的数据传输,并对采用此方法实现数据通信的优点进行了阐述。     

Architecture and design of a portable protocol tester

The architecture and design of a new generation portable protocol tester that includes most of the capabilities of dedicated protocol test systems and all of the capabilities of commercial portable testers are discussed. The general tester environment and model of the system under test as viewed by the protocol tester are presented. A conceptual model of a protocol tester that captures its main functional requirements is proposed, and the basic performance requirement is presented. The design and structure of a protocol tester that provides the functional and performance capabilities described are outlined. The implementation utilizes custom VLSI multiprocessors and a special-purpose multiprocessing operating system to allow active and passive testing of more than one system simultaneously. The testing software on each processor is organized as a single process consisting of protocol and test entities with event occurrences being implemented as procedure calls aided by hardware subprocessors. All testing methodologies defined by the ISO, including the ferry method, can be implemented and standardized conformance test suites supported. Suggestions for future extensions to the design are offered     

基于蚁群的对等网路由协议的研究

综合考虑结构化协议和非结构化协议的优点,提出了一种基于蚁群的对等网路由协议.分析对等网路由协议的研究现状,对结构化路由协议和非结构化路由协议进行了介绍.对等网路由协议进行了总体设计,给出了对等网路由协议的描述和总体结构图.提出了对等网路由协议算法的数据结构,并对等网路由协议算法进行了详细设计.利用仿真实验对等网路由协议进行了验证,实验结果表明该对等网路由协议是有效的.     

网关设备H.248协议的实现

通过对H.248协议、软交换技术和数字程控交换机技术的分析,对H.248协议内容进行了详细描述,对网关的软件、硬件体系结构提出了具体的设计思路及方案,针对软件的可扩展性,提出了分层结构的设计思想,并对软硬件各种组成模块的功能进行了详细介绍。提出了H.248协议在网关设备的设计思路及实现方案,基于标准要求,对注册及呼叫流程提出了具体的实现方法,并针对网关在实际应用中的部署环境,提出了网关双归属实现方案,提高了设备的稳定性及可靠性。