舰载C3I系统对抗效能分析

舰载C^3I系统对抗效能评估是C^3I系统效能评估的一个重要方面。从舰载C^3I系统的组成和作战使用流程入手,明确了C^3I系统对抗效能的概念,分析了影响C^3I系统对抗效能的主要因素,建立了对抗效能评估的指标体系,并为各项指标建立了计算模型。     

用赋权公式法对战术防空C3I系统综合效能评估

战术防空C^3I系统综合效能评估是一个多目标评价过程,多目标评价中的一个重要因素是考虑目标权系数的选取。本文从数学理论出发,经过严密的数学分析及推导,得出了确定权重的数学公式。并结合评价指标,运用此公式确定权重的方法,给出了系统效能的评价算法,对战术防空C^3I系统效能进行了综合评估。效能评价实例说明了公式赋权法和评价算法的有效性。     

C^3I系统性效比分析研究

提出一种比较全面的C^3I系统效能的模拟分析方法，从战场态势的角度模拟分析C^3I系统通信网性能对兵力效能的影响程度，提出改进C^3I系统性能的对策。     

一种多传感器数据融合仿真平台的设计

数据融合是现代C^3I系统的重要组成部分,对C^3I系统效能的发挥起着决定性的作用。本文针对第一级目标运动学数据融合,构建了通用的可视化多传感器数据融合仿真平台,为研究者提供了进行各种融合算法仿真验证和定量评估的仿真环境。进行了合理的软件设计,模块化和开放性的结构使仿真平台的通用性得到了体现,与通信链路连接即可处理真实的目标数据。最后通过在本系统运行的一个软件实例,证明了仿真平台的有效性与实用性。     

海军C^3I网络系统安全问题及防御对策

针对海军C^3I网络技术的新发展和其对抗的基本方式，文章简述了海军C^3I网络系统面临的威胁，从网络对抗作战模型的3个层次，深入分析了海军C^3I网络系统存在的安全问题，介绍了海军C^3I网络系统防御对策。这些讨论对我海军提高C3I网络系统防御的能力有一定的理论和现实意义。     

海湾战争中的通信电子战及美军通信对抗的研究

C^3I系统是兵力的倍增器，现代战争的实质是双方的C^3I系统之战，C^3I系统的应用有力地推动了通信电子战的发展，这次海湾战争就是一个有力的证明，本评述包括四个方面：多国部队所使用的通信电子战装备、采取的电子战的战术，美军的通信电子战科研及电子战易损性评价。     

"网络中心战"中美国海军C4ISR系统效能评估

随着美国海军“网络中心战”从设想开始走向现实．对其C^4ISR系统的效能进行评估并分析其对作战效能的影响具有重要意义。通过分析影响C^4ISR系统效能的因素．利用图论、信息论和复杂性理论．提出了C^4ISR系统效能评估方法,研究了信息、网络、作战流程等因素对作战效能的影响,并建立了数学模型,比较了“平台中心战”和“网络中心战”中C^4ISR系统的效能。     

基于信息熵的美军C4ISR系统效能评估

随着美军信息化水平的不断提高,C^4ISR系统“战斗力倍增器”的作用更加突出,对美军C^4ISR系统的效能进行评估并分析其对作战效能的影响,具有重要的理论和现实意义。对影响C^4ISR系统效能的相关因素进行了分析,利用香农信息熵和图论的方法,建立了C^4ISR系统效能评估方法,研究了信息、网络、作战流程等因素对作战效能的影响,并建立了数学模型;以美军航母战斗群空袭作战为例,比较了“平台中心战”和“网络中心战”两种作战方式中C^4ISR系统的效能。     

C^4 ISR系统效能层次化评估方法研究

分析了C^4ISR系统效能层次化评估方法,以分系统各性能指标作战要求符合度的主客观加权和计算分系统的作战要求符合度,运用信息熵描述作战要求符合程度的不确定性实施各分系统性能评估;分系统性能评估结果作为输入,以C^4ISR系统完成作战任务的成功率度量C^4ISR系统效能,构造外界因素影响因子矩阵度量外界因素对各分系统信息熵的影响,以及各因素对C^4ISR系统整体信息熵影响的权值,结合C^4ISR系统信息流串、并联关系聚合各分系统信息熵,实施C^4ISR系统效能评估。并基于定性分析构建了C^4ISR系统对武器系统效能提升作用的定量函数。最后用实例验证该方法有效性。     

粗糙集理论在C^3I系统效能评估中的应用研究

C3I系统是现代战争中战斗力的倍增器.客观准确地评估C3I系统效能对找出制约系统效能的发挥的薄弱环节有着重要的意义.首先建立了C3I系统评估指标体系和基于粗糙集理论的C3I系统效能评估模型.其次根据粗糙集理论对C3I系统性能指标进行约简,得到了影响系统效能评估的属性和规则.最后介绍了一种运用加权系数的方法,对C3I系统效能进行评估.结果显示粗糙集理论对C3I系统效能评估能取得较好的效果.     

Overall reliability evaluation for large computer communication networks: An MHC approach

An important parameter in the topological design of computer communication networks is that of overall reliability, rather than terminal-pair reliability, as one is interested in not allowing service disruption between any pair of nodes. Exact techniques for overall reliability evaluation based on the spanning trees idea fail for networks even of reasonable size because of the enormous amount of computer time and storage required. In this paper, we present a very simple and fast method based on an m-level hierarchical clustering (MHC) for network overall reliability evaluation which gives results as good as exact techniques for realistic values of link reliability (e.g. 0.9 or more). Adaptability of a practical clustering method (i.e. complete linkage, CL) to obtain near optimal clusters for overall reliability evaluation by incorporating suggested modifications is proposed.     

Reliability evaluation of a communication system considering a multistate model

The methods most often suggested for reliability evaluation of communication systems/flow networks consider two states, namely the good state and the bad state. This paper considers multistate modelling of the network elements. The states which permit a flow less than the maximum assigned capacity are assumed as parallel and mutually exclusive elements in the network. A method is proposed for reliability evaluation of a communication network considering multistate modelling of the network elements. The proposed method has been implemented on a computer and results obtained using the proposed method are compared with the existing methods for the two state model conditions.     

基于结构分割的自适应MPEG—I视频编码系统

本文介绍一种基于结构分割的自适应编码系统。图像组（ＧＯＰ）中参考帧的数目以及它们间的间隔由可补偿性分析自适应地确定。时间视觉掩盖效应已利用于合理分配不同帧的码率。实验结果表明，这种自适应调整图像组结构的编码系统，无论视觉效果还是信噪比，都明显优于固定结构的编码系统。     

Reliability Evaluation in Computer-Communication Networks

The network reliability for a computer-communication network is defined and a method based on spanning trees is proposed for its evaluation. The network reliability expression and s-t terminal reliability expression are compared assuming an equal probability of survival for each communication link. Examples illustrate the method.     

把跳频嵌入导弹武器C^3I系统分组无线网

文章针对导弹武器C3I系统的特点，对把跳频技术嵌入该通信网后需要考虑的关键问题进行了分析和探讨，以供进一步设计和实现时参考。     

军事通信网络系统可靠性的分层指标体系研究

根据军事通信网络的体系结构,结合ISO协议的分层方式,给出了一种通信网络可靠性指标的层次分析模型与方法。定义了通信网络可靠性的内涵,描述了可靠性的分层定义、指标、及其关键测度。该分析方法可应用于基于通信网络系统的分析、规划、评价和质量管理等领域,也可应用于系统的时效特性、协同性、及时性等性能参数的工程分析。     

一种基于神经网络的通信网节点重要性评价方法

准确地评估通信网中节点的重要性,对于通信网的设计、维护管理以及提高整个通信网的可靠性都有重要作用。现有的一些评估方法通常只是考虑单一的影响因素,其评估结果不准确。提出一种基于自组织神经网络的通信网节点重要性评估模型,将通信网中节点的度、节点的网络凝聚度、节点对通信网生成树的影响程度和节点对通信网可靠性的影响程度作为节点重要性的评价指标,对通信网中的节点进行重要性等级的划分。实验结果表明该模型能够全面地评估节点的重要性。     

Computational techniques for accurate performance evaluation ofmultirate, multihop communication networks

Computational techniques are presented for the connection-level performance evaluation of communication networks, with stochastic multirate traffic, state-dependent admission control, alternate routing, and general topology-all characteristics of emerging integrated service networks. The techniques involve solutions of systems of fixed-point equations, which estimate equilibrium network behaviour. Although similar techniques have been applied with success to single-rate fully connected networks, the curse of dimensionality arises when the techniques are extended to multirate, multihop networks, and the cost of solving the fixed point equations exactly is exponential. This exponential barrier is skirted by exploiting, in particular, a close relationship with the network reliability problem, and by borrowing effective heuristics from the reliability domain. A series of experiments are reported on, comparing the estimates from the new techniques to the results of discrete-event simulations     

在数字信号处理器上实现I2C接口

数字信号处理器(DSP)广泛应用于各种信息处理系统中,同时I2C也是一种广泛使用的芯片间的通讯总线,所以在实际应用中,DSP与I2C总线接口的问题十分重要。通过对DSP及I2C总线读写时序的分析,提出了一种在DSP上实现I2C主接口的方案。方案利用DSP外部存储器接口,以及锁存器和缓冲器实现I2C接口硬件,并由软件控制I2C读写流程,具有硬件设备简单、可靠性高等特点。同时给出了用TMS320C80DSP实现该方案的例子并对其可行性进行了验证。     

On the reliability and performance of real-time one-hop broadcast MANETs

Recently, broadcast communications in mobile ad hoc networks (MANETs) have been deployed in many mission-critical applications. So far, most investigations of such broadcast networks focus on multi-hop connectivity taking all one-hop links for granted. In this paper, the reliability and performance of real-time one-hop broadcast services in IEEE 802.11 based MANETs are investigated analytically and by simulation. Having specified possible applications and the features of IEEE 802.11 broadcast communication in dynamically self-organized networks under harsh communication environment, analyses are conducted to derive closed form expressions of the reliability and performance indices for both one-dimensional (1-D) and two-dimensional (2-D) broadcast MANETs: packet reception rate (PRR) and packet transmission delay. The proposed analytical models account for the impact of broadcast hidden terminal problem, message arrival interval, backoff counter process, space distributions of nodes, and fading transmission channel on the reliability and performance of the broadcast MANETs. As an example, the proposed models are applied to the evaluation of safety-related inter-vehicle communication on a highway. From the obtained numerical results under various offered traffic and network parameters, new observations and effective enhancement suggestions are given.