导航装备数字维修平台的安全技术

讨论了导航装备数字维修平台的网络传输安全性问题,分析其安全需求,提出采用Java安全技术来解决堆修平台的安全性.从工程项目实际需要的角度出发,阐述了在导航装备数字维修平台中的Java安全机制以及实现技术.     

Relative Aging of Coherent Systems

In this article, we carry out the stochastic comparison between coherent systems through the relative aging order when component lifetimes are independent and identically distributed. We make use of the signature to characterize the structure of coherent systems, and derive several sufficient conditions under which the compared systems with the common size can be ordered in the sense of relative aging. Specially, we present some scenarios wherein the better a coherent system is, the faster it ages. Moreover, we discuss the relative aging of dual systems as well. Several numerical examples are provided to illustrate the theoretical results. © 2017 Wiley Periodicals, Inc. Naval Research Logistics 64: 345–354, 2017     

基于局域模板的STAP非均匀检测器

分析了STAP(Space Time Adaptive Processing)中强干扰目标影响传统非均匀检测器性能的机理,针对强干扰目标引起的非均匀检测器性能下降和传统自适应功率剩余(APR)方法运算量大的问题,提出了一种基于局域模板的非均匀检测器(Local Template NHD,LT-NHD)。该方法不需要进行协方差矩阵求逆的耗时运算,便能获得较高的运算效率;此外,其检测不易受训练样本中的强目标样本影响,能获得比传统方法更为鲁棒的检测性能。实测数据实验验证了本文方法的有效性。     

On optimal system designs in reliability‐economics frameworks

Reliability Economics is a field that can be defined as the collection of all problems in which there is tension between the performance of systems of interest and their cost. Given such a problem, the aim is to resolve the tension through an optimization process that identifies the system which maximizes some appropriate criterion function (e.g. expected lifetime per unit cost). In this paper, we focus on coherent systems of n independent and identically distributed (iid) components and mixtures thereof, and characterize both a system's performance and cost as functions of the system's signature vector (Samaniego, IEEE Trans Reliabil (1985) 69–72). For a given family of criterion functions, a variety of optimality results are obtained for systems of arbitrary order n. Approximations are developed and justified when the underlying component distribution is unknown. Assuming the availability of an auxiliary sample of N component failure times, the asymptotic theory of L‐estimators is adapted for the purpose of establishing the consistency and asymptotic normality of the proposed estimators of the expected ordered failure times of the n components of the systems under study. These results lead to the identification of ε‐optimal systems relative to the chosen criterion function. © 2007 Wiley Periodicals, Inc. Naval Research Logistics, 2007     

靶弹系统发展的某些新特点

靶弹系统建设对于防空兵器试验和部队作战训练具有重要的作用。介绍了靶弹的组成,美、俄等国靶弹系统研发现状以及主要型号靶弹的技术战术性能,详细分析了外军靶弹研发的特点和发展趋势,对我国防空兵器靶标体系建设有一定的参考借鉴作用。     

A note on signature‐based expressions for the entropy of mixed r‐out‐of‐ n systems

We provide an expression for the Shannon entropy of mixed r‐out‐of‐ n systems when the lifetimes of the components are independent and identically distributed. The expression gives the system's entropy in terms of the system signature, the distribution and density functions of the lifetime model, and the information measures of the beta distribution. Bounds for the system's entropy are obtained by direct applications of the concavity of the entropy and the information inequality.Copyright © 2014 Wiley Periodicals, Inc. Naval Research Logistics 61: 202–206, 2014     

时空预滤波对运动检测器速度估计的影响分析

初级运动检测器在检测自然图像的运动速度时存在不足,在运动检测器前增加时域和空域滤波器可以改善图像运动速度的估计.详细分析了时空滤波器对运动检测器输出的影响,结果表明通过设计滤波器可以有效提高速度估计的准确性,并且可以减小相对误差.     

连续波金属探测器电磁场模型的理论分析

介绍了连续波金属探测器的工作原理,提出一种新的连续波金属探测器电磁场模型,采用基于电磁场和电路的混合方法对该模型进行了详细的理论分析,推导出在空气及海水中金属探测器接收感应电压的计算公式,并给出了简要的设计实例.文中理论分析结果对于连续波金属探测器设计与分析具有指导意义,对其它类型的金属探测器设计也有参考价值.     

重复脉冲激光辐照InSb(PV)型探测器的热损伤

在建立高斯型重复脉冲激光辐照InSb(PV)型探测器物理模型的基础上,采用近似解析解的形式计算了圆柱形InSb靶板的二维温度场。通过数值分析得出了在激光辐照时,InSb(PV)型探测器的温升与时间的关系,并计算出相应的损伤阈值。研究表明:在高斯型重复脉冲激光辐照下,损伤阈值受到脉冲数目、宽度、重复频率以及脉冲激光光斑半径的影响,InSb(PV)型探测器会发生熔融损伤,发生于迎光面的光斑中心。对于一定厚度胶层的InSb(PV)型探测器,只有强度大于一定阈值时重复脉冲激光的辐照才可能发生熔融损伤,越薄的胶层对应的损伤阈值越大。为了增加InSb(PV)型探测器的激光对抗能力,应该减小胶层厚度。     

37火控系统基础练习检测器的研制

研制的“37火控系统基础练习检测器”具有模拟激光测距,检测跟踪测速是否准确,实施二次瞄准等一系列适应新式火控系统训练需要的功能。可以按照射击教范要求,完成新装备实车基础练习的各项训练和考核。该装置目前已批量生产配发部队使用。本文介绍了该装置的功能、技术方案、硬件、软件设计和使用特点。