基于VC++的战术数据链通信仿真系统设计与实现

为了实现战术数据链通信仿真系统,在分析与研究联合战术信息分发系统（JTIDS）关键 技术的基础上,构建了战术数据链链路层仿真模型。依据仿真模型中各模块的划分,以VC+ +语言为编程实现平台,采用面向对象的程序设计方法,设计并实现了Reed-Solo mon码（RS码）编译码类、循环码移位键控类、最小移频键控类。最后在高斯白噪声信道下 对仿真系统进行了验证和性能分析。结果表明,设计的各个类模块功能满足系统指标,基于 各个类模块构建的仿真系统符合设计要求,为下一步研究JTIDS系统干扰与抗干扰性能奠定 了基础。     

JTIDS传输符号产生模块的FPGA设计

根据公开的关于Link16数据链的信息标准并结合对战术数据链的具体要求,设计 了一种JTIDS传输符号产生模块,该模块包含RS编码、交织、CCSK软扩频、CCSK码字加密等 若干子模块。首先介绍了Link16数据链传输符号的产生原理,对其各个子处理模块进行了设 计并提出了硬件实现方案,然后在Quartus II环境下选择Cyclone II系列的EP2C8Q208C8 FP GA芯片进行了JTIDS传输符号产生模块的系统级综合与仿真,并在该芯片的开发板上进行了 验证,硬件成品可用于JTIDS终端功能测试与评估等多种场合。     

JTIDS系统抗干扰性能仿真

针对联合战术信息分发系统（JTIDS）物理层传输波形建立了MATLAB仿真模型,并对其抗白 噪声干扰、单频或阻塞式干扰,以及组网的性能进行了仿真和分析,为JTIDS系统抗干扰技 术的研究提供参考。     

《电讯技术》专题资料 《现代战争目标识别技术的现状及发展》题要(三)

敌我识别系统数据链中RS码编译码研究RS码是一种性能良好的纠错码 ,广泛应用于通信系统中以应对传输中发生的错误。本文研究了在敌我识别系统数据链中所引入的RS码的性能 ,介绍了RS码的编码和译码算法 ,进行了性能仿真 ,并给出了仿真结论。VXI二次雷达自动测试系统作为VXI总线测试平台的具体应用 ,针对二次雷达整机测试的需要 ,成功地研制了VXI二次雷达自动测试系统。该系统采用基于VXI总线结构 ,并在LabwindowsCVI 5.0软件开发平台的基础上 ,编制了系统测试软件。经实践证明 ,该系统实现了整机指标自动测试 ,大大提高了测试效率…     

基于QualNet的战术数据链半实物仿真

为了让战术数据链仿真系统能够实时加载真实的消息业务,使仿真精确性和可信度得到提高,基于QualNet仿真软件,设计并实现了一种战术数据链的半实物系统.同时,对半实物仿真下的战术数据链性能指标进行仿真,得出了性能曲线并对其进行了分析.     

RS码类的构建及在数据链模拟系统中的应用

Reed Solomon码(RS码)具有强大的纠错能力,在数据通信中得到了广泛的应用,如 RS(31,15)码已经成为美军数据链系统的标准码。为了实现应用于数据链模拟系统中的RS编 译码类,从分析RS纠错编译码原理入手,在研究了RS编译码模型的基础上,重点对RS编译码 的编程实现方法进行了详细分析。以VC+〖KG-*3〗+为编程实现平台,采用面向对象的 程序设计方法,构建且封装了RS编译码类,最后对RS编译码类的纠错性能进行了验证, 结果表明,设计的RS编译码类能够有效纠错且正确恢复发端发送的信息,满足模拟系统的设 计要求。     

VHF/UHF无线高速数据传输中的级联编码

介绍了在VHF/UHF无线通信系统中进行高速数据传输时 ,采用RS码与卷积码的级联码对传输的数据纠错编码以及对提高数据传输可靠性的影响 ,并在加性高斯白噪声信道环境下对能够达到的误码性能进行了仿真分析。     

QualNet环境下战术数据链的性能对比

在QualNet环境下通过系统建模和大量系统仿真实验(除了轮询协议和TDMA协议不同之外,其它实验条件完全相同)对比研究了战术数据链在轮询协议、TDMA协议的系统性能表现。实验和分析结果表明,战术数据链采用TDMA协议后不仅大幅度提高了网络规模,而且实时性也有一定程度的提高。     

基于欺骗式干扰的JTIDS侦察装备MSK解调性能分析

分析了对美军先进的作战指挥数据链Link16进行欺骗式干扰的可行性。以此 为目的,重点分析了JTIDS侦察装备频移载波相干MSK解调原理,通过Matlab仿真实现JTIDS 信号的发射与接收过程,最后统计相干解调后不同信噪比下信息码元的误码率,得到该方法 的解调性能,为形成欺骗式干扰打下基础。     

基于QualNet的战术数据链多链建模与仿真

战术数据链(TDL)的基本作用是保证战场上各个作战单元之间迅速交换情报信息,提高相互协调能力和整体作战效能.为了研究在实际应用中战术数据链系统多链工作情况下的实时性,基于QualNet仿真软件,设计并实现了一种战术数据链的多链模型,同时结合两种波形的试验对战术数据链多链间分组传输时延进行仿真,给出了仿真结果并进行了分析.     

Consciousness, Spirituality and Right Decision/Negotiation in Purposeful Complex Adaptive Systems

Both cybernetic and self-organizing, purposeful complex adaptive systems (PCAS) express purpose by solving problems defined by choosing and delivering values to participants as operational goals through decision making. Individuals, groups, organizations, and economies are PCAS. Here we focus on indviduals and groups. Evolutionary Systems Design (ESD) is a universal (culture independent) general problem solving, formal modeling/design framework for PCAS that can be computer implemented in same time/same place or telework modes. Formally, in ESD sets of elements and their relations modeling a PCAS evolve through cybernetics/self organization. Spirituality and the concept of right decision/negotiation in PCAS are discussed in relation to consciousness. Rightness comes from spirituality, i.e., consciousness experiencing oneness. Oneness is integrally bound with love; hence the term oneness/love. Through right decision/negotiation PCAS try to realize their ultimate purpose to live Two (the relative, the process of all there is) as One (the absolute, all there is). Oneness/love, connectedness to One, promotes problem solving and negotiation - expressed formally in the ESD problem representation - that is at the same time right. Simply put, right problem solving requires oneness/love and delivers oneness/love. Computer and receiver modes of consciousness are discussed in relation to oneness/love and its absence experienced as separateness/fear. Ways to transit from the latter to the former are considered. P.L. Yu's Habitual Domain (HD) framework is introduced and discussed in relation to ESD. Evolutionary heuristics for evolution of an ESD right problem representation through cybernetics/self-organization are presented based on combined HD and ESD concepts. Then operational procedures for defining and validating a right problem for an individual or group and associated right decision/negotiation outcome are considered. Thus, the work contributes to procedural rationality - how decisions should be or are made - in purposeful complex adaptive systems. The paper suggests that for humans to live fully (awake) is to live in our love-based spirituality, in the moment, consciousness experiencing oneness/love at the edge of chaos, challenged in our purpose to live Two as One by spiritual or right decision/negotiation through cybernetics/self-organization, i.e., problem solving under oneness. Artificial agents in PCAS may participate in right decision/negotiation. They may in principle have consciousness but the nature of the subjective experience is unclear.     

INTENSITY-BASED VALUATION OF RESIDENTIAL MORTGAGES: AN ANALYTICALLY TRACTABLE MODEL

This paper presents an analytically tractable valuation model for residential mortgages. The random mortgage prepayment time is assumed to have an intensity process of the form h _t = h ₀( t ) +γ ( k − r _t )⁺ , where h ₀( t ) is a deterministic function of time, r _t is the short rate, and γ and k are scalar parameters. The first term models exogenous prepayment independent of interest rates (e.g., a multiple of the PSA prepayment function). The second term models refinancing due to declining interest rates and is proportional to the positive part of the distance between a constant threshold level and the current short rate. When the short rate follows a CIR diffusion, we are able to solve the model analytically and find explicit expressions for the present value of the mortgage contract, its principal-only and interest-only parts, as well as their deltas. Mortgage rates at origination are found by solving a non-linear equation. Our solution method is based on explicitly constructing an eigenfunction expansion of the pricing semigroup, a Feynman-Kac semigroup of the CIR diffusion killed at an additive functional that is a linear combination of the integral of the CIR process and an area below a constant threshold and above the process sample path (the so-called area functional). A sensitivity analysis of the term structure of mortgage rates and calibration of the model to market data are presented.     

The Feminist Competition/Cooperation Dichotomy

Feminist literature sometimes posits that competition and cooperation are opposites. This dichotomy is important in that it is often invoked in order to explain why mainstream economics has focused on market activity to the exclusion of non-market activity, and why this fascination or focus is sexist. The purpose of this paper is to demonstrate that the competition/cooperation dichotomy is false. Once the dichotomy is dissolved, those activities which are seen as competitive (masculine) and those which are seen as cooperative (feminine) are no longer mutually exclusive but are, in fact, dependent upon one another. It is shown that the outcome of competition (more and better knowledge) enhances, and in some cases makes possible, cooperation. The function of battle is destruction; of competition, construction. Ludwig von Mises     

我的地盘我做主：组织内领地行为与人际冲突的关系研究

领地行为是重要的、广泛存在的,然而在组织生活中却经常被忽视,相关的理论与实证研究较少,其理论体系尚未完全建立,极富研究价值。本文以组织内个体为研究对象,着力于剖析其领地行为与人际冲突的反应模式,以期从组织内领地行为的视角寻找到引发不同冲突的路径与作用机制,推动相关理论的发展,并为相应的管理实践提供理论指导和参考依据。研究结果表明：身份导向标记行为和预先防卫行为越多,关系冲突越少;控制导向标记行为和反应性防卫行为越多,关系冲突越多;只有预先防卫行为可以引发正向的任务冲突,其他领地行为不和任务冲突建立直接的联系。     

基于中频数字化的导航精密测距信号处理

简要叙述了导航精密测距的基本原理,提出了基于中频数字化的导航精密测距信号处理方案,介绍了各个处理单元的原理及功能并给出了实现方法和仿真结果.     

Maintaining a committed online customer: A study across search-experience-credence products

The goal of relationship marketing is to build and maintain a committed, loyal relationship between a customer and an organization. Although studies have discussed the types of relational bonds that enhance customer loyalty, empirical research that focuses on the application of relational bonds in a virtual environment is relatively sparse. In response, this study investigates the effects of various relational bonds on customer commitment across search-experience-credence goods/services on Internet. The results suggest that financial, social, and structural bonds have positive impacts on customer commitment. In addition, financial bonds are more successful in strengthening customer commitment for search goods/services than for experience or credence goods/services. Structural bonds are more important for credence and experience goods/services than for search goods, and social bonds are almost equally important for all three types of goods/service.     

自动车辆定位系统中的FSK/FM组合调制解调特性分析

介绍了自动车辆定位系统中的技术体系结构。讨论了核心技术通信中的FSK／FM组合调制与非相干解调的基本方法，分析了影响系统误比特率的几个因素。给出了不同条件下的组合FSK／FM调制解调特性比较。     

A longitudinal study of franchisor failure according to Altman’s Z model

Purpose: The foremost objective of this study is to obtain segments/clusters of franchisors that are more likely to fail. A second aim is to evaluate the influence of the usual variables of the franchise contract on the solvency of franchises.

Design/methodology/approach: This study set up a database with information collected from several Spanish franchising yearbooks and franchisors’ websites to establish the census of Spanish franchisors. This article worked with a census of the franchises operating in Spain from 2001 to 2011. Latent class regression analysis is used.

Findings: This research found four segments or classes of franchisors with regard to their failure pattern. In addition, this article defined the most influential variables in the franchisors’ risk of failure. The relationships between the variables that define a franchise contract and the Z scores of Altman’s model have been extracted. The dependent variable has been the Altman’s Z model and the independent variables are those that define the franchise contract.

Research implications: This methodology offers potential franchisees a new criterion for assessing the franchise chains they are investigating, taking into account their risk of failure. This allows franchisees to better highlight those franchisors that have a lower crash risk and avoid the damage incurred by the closure of the chain. The information provided for franchisees should be accessible, usable, and suitable to help franchisees to choose the best franchise systems in which to invest. This methodology is of course very useful for franchisors, because they can comprehend their financial situation and how they could manage the franchising variables in order to improve their solvency.

Practical implications: All the segments are solvent, except Segment 3. The distinguishing feature of this segment is that over 64 percent of the firms are retailer chains. In addition, more than 20 percent of the franchises from our database are in financial danger, and this is the group where the number of service companies is lower.

Originality/value: This research is unique in two ways. First, this study presents a new methodology in this field that allows researchers to use the historical-financial data of franchisors, and the information of the franchise contract to predict franchisor failure. Second, this article helps franchisees to make their own decisions on the basis of the franchisors’ level of risk of failure. Third, this research offer a theoretical contribution about franchisor failure, this topic is scarcely treated by academic literature.     

现代物流与传统物流的基础理论研究

本文认为,物流性质划分为固有性质和非固有性质,物流非固有性质的“传统/现代”特性被定义为“传统物流/现代物流”。文章以物流时间维、物流性质维和物流特征维构建物流发展状态三维结构模型,阐述传统物流与现代物流的辩证关系,指出传统物流、现代物流、传统/现代物流相互转换这三种模式是各个国家各个时期的客观存在,它们在不同国家不同时期有不同的构成。     

大动态PCM/FM遥测信号的非相干解调

针对大动态低码率PCM/FM遥测信号的可靠接收问题展开研究,给出了一种基于连续相位调制（CPM）信号原理的载波频偏矫正及差分序列检测的非相干接收方案。针对限幅鉴频、多符号检测及差分序列检测等3种非相干解调算法,介绍了各自应用于PCM/FM信号的算法原理,并比较了3种算法的解调性能及对大动态环境的适应能力。计算机仿真表明,在无残留频偏情况下,2符号相位差分序列检测性能最好;但在0.05倍码速率的残留频偏下,1符号相位差分序列检测的性能更好,优于2符号相位差分序列检测、限幅鉴频检测和多符号非相干检测。对PCM/FM信号的讨论包含了几种典型的非相干解调,对大动态环境下的PCM/FM接收有重要的参考价值。