炮兵雷达阵地选择仿真系统的设计与实现

虚拟现实技术是20世纪末发展起来的一项涉及众多学科的高新应用技术,主要针对在MultiGen Creator和Vega软件平台下开发三维仿真系统。针对目前炮兵雷达阵地选择虚拟仿真的需求,设计了炮兵雷达阵地选择仿真训练系统,介绍了仿真系统的组成及功能模块,论述了二维数字地图生成与显示、三维场景生成与显示、视景仿真的实现等关键技术,最后给出了仿真效果图。结果表明了仿真系统的可行性和实用性,极大地提高了训练效率和训练水平。     

Generalizing the survival signature to unrepairable homogeneous multi‐state systems

The notion of signature has been widely applied for the reliability evaluation of technical systems that consist of binary components. Multi‐state system modeling is also widely used for representing real life engineering systems whose components can have different performance levels. In this article, the concept of survival signature is generalized to a certain class of unrepairable homogeneous multi‐state systems with multi‐state components. With such a generalization, a representation for the survival function of the time spent by a system in a specific state or above is obtained. The findings of the article are illustrated for multi‐state consecutive‐k‐out‐of‐n system which perform its task at three different performance levels. The generalization of the concept of survival signature to a multi‐state system with multiple types of components is also presented. © 2016 Wiley Periodicals, Inc. Naval Research Logistics 63: 593–599, 2017     

数字交流全电炮控系统研究

通过对比分析国内外坦克炮控系统技术,提出炮控系统技术发展方向,并提出数字交流全电炮控技术控制方案,即一种基于以数字信号处理器（ＤＳＰ）为主控芯片的永磁同步电机双环控制系统,控制方法采用正弦波脉冲宽度调制（ＳＰＷＭ）的控制方案。文中还就一些关键技术,如双模双环控制技术、变参数寻优控制方法、非线性反馈和非线性给定等进行了研究分析。     

On the conditional residual lifetime of coherent systems under double regularly checking

In this paper, we consider a coherent system with n independent and identically distributed components under the condition that the system is monitored at time instances t₁ and t₂ (t₁ < t₂). First, various mixture representations for reliability function of the conditional residual lifetime of the coherent system are derived under different scenarios at times t₁ and t₂ (t₁ < t₂). Several stochastic comparisons between two systems are also made based on the proposed conditional random variables. Then, we consider the conditional residual lifetime of the functioning components of the system given that j components have failed at time t₁ and the system has failed at time t₂. Some stochastic comparisons on the proposed conditional residual lifetimes are investigated. Several illustrative graphs and examples are also provided.     

新型多相结构MWC宽带数字接收机设计

提出一种基于多相调制宽带转换器结构的新型压缩采样数字接收机,可对宽带中频信号进行截获。新型接收机结构包括:串并转换、并行相乘、多相滤波三个模块。在用相同乘法器资源的条件下,新型接收机结构的整体数据速率远低于现有的调制宽带转换器结构,并且通过仿真验证了其正确性。该新型结构为调制宽带转换器离散压缩采样数字接收机在现场可编程门阵列上的物理实现奠定了基础,使整个接收机结构更具有实际工程应用价值。     

Signature based analysis of m‐Consecutive‐k‐out‐of‐n: F systems with exchangeable components

In this article, we study reliability properties of m‐consecutive‐k‐out‐of‐n: F systems with exchangeable components. We deduce exact formulae and recurrence relations for the signature of the system. Closed form expressions for the survival function and the lifetime distribution as a mixture of the distribution of order statistics are established as well. These representations facilitate the computation of several reliability characteristics of the system for a given exchangeable joint distribution or survival function. Finally, we provide signature‐based stochastic ordering results for the system's lifetime and investigate the IFR preservation property under the formulation of m‐consecutive‐k‐out‐of‐n: F systems. © 2011 Wiley Periodicals, Inc. Naval Research Logistics, 2011     

一种基于VLIW DSP架构的高性能取指流水线

以超长指令字(VLIW)数字信号处理器(DSP)作为平台,针对现有提高单线程取指流水线效率的方法中存在的弊端,提出了一种高性能的取指流水架构.该架构支持无效取指的检测与作废,从而降低不必要的cacbe访问,减少取指流水停顿周期,该结构还引入专用硬件支持编译调度的循环软流水,有效提高指令并行性,降低代码存储空间,由此释放...     

灰色层次模型战术数据链综合性能评估方法

从战术数据链的功能模型出发,考虑影响战术数据链正常功能发挥的各方面因素,基于灰色层次理论,构建了战术数据链综合性能评估指标体系,在此基础上提出了战术数据链综合性能的灰色层次模型。应用实例的过程及结果表明,评估方法简易可行,评估结论相对真实合理,对战术数据链性能评价及新功能的开发具有理论指导意义和应用价值。     

反坦克导弹抗干扰技术

抗干扰能力是反坦克导弹武器系统的重要性能指标之一,第二代反坦克导弹武器系统采用目视瞄准、电视(红外)跟踪、有线传输指令的制导方式,大大提高了武器系统的自动化程度。由于现代战争中干扰源种类越来越多,因此提高武器系统的抗干扰能力显得尤为重要,针对战场上可能出现的干扰源类型,给出了不同类型干扰源的干扰机理,全面分析了反坦克导弹武器系统采用的抗干扰技术并简述了相应的工作原理。     

基于最大电流方法的数字均流总线设计

多个电源模块并联供电系统,最广泛使用基于最大电流方法的自动均流技术,通过专用的模拟均流总线,传输与模块最大电流成正比的电压信号,各个模块使用该电压信号实现均流.该模拟电压信号很容易受到各种噪声影响,导致均流控制失败.针对该问题,设计了单线数字均流总线,实现最大电流值的数字传输.分析结果表明,设计的单线数字均流总线能够实现模拟均流总线相同的功能,并且具有更强的抗干扰能力.