基于认知无线电的通信抗干扰技术

分析了基于认知无线电(Cognitive Radio,CR)的通信抗干扰技术原理,研究了频谱感知和抗干扰策略决策等关键技术,建立了以信噪比、误码率关联变化评判通信受扰切换时机准确性准则。采用蒙特卡罗(Monte Carlo)技术进行了仿真。解决了系统工作方式误切换难以评判的技术难题。分析了在复杂电磁环境下系统遇到的问题,提出了提高基于认知无线电的抗干扰通信系统通信效率、能力的方法和进一步改进完善系统的措施。     

一种面向节点定位的移动信标动态路径规划方法

针对基于移动信标的传感器节点定位问题,提出一种基于在线决策的移动信标动态路径规划方法.针对以往算法大都只适用于节点均匀分布的局限,该方法用移动信标不断获取两跳范围内的未定位节点数目,并向最大覆盖未定位节点方向移动,不需要网络先验信息,即可实现路径的优化.仿真结果表明:与传统方法相比,该方法无需网络的先验信息,在移动路径长度上具有明显优越性,减少了信标的能量消耗,更适用于户外部署的大规模传感器网络.     

基于PCB技术的延时线设计方法

为了设计大功率低损耗的延时线,提出了用多股窄印制线并行绕制替代单股印制线绕制、在某些特定位置将并绕的多股印制线交叉换位的多层PCB螺旋电感的设计方法,并用该电感和电容模拟电缆的分布参数电感和电容制作延时线。通过多股并绕交叉换位的方式可以增加电感的有效截面积,减小电感的涡流损耗,有效提高电感的品质因数。测试结果表明:该螺旋电感的品质因数在短波频段内有较大提高。利用该螺旋电感制作的200ns延时线在通1A电流50 W功率时,延时性能好、驻波比小、衰减量小,满足大功率低损耗的要求。     

基于自适应动态分簇的二元传感器网络目标跟踪算法

针对二元传感器网络的目标跟踪问题,提出了一种通过设置簇内传感器节点数目门限自适应地调整簇的激活半径、利用少量被激活的节点进行跟踪的方法,并利用一种改进的分布式粒子滤波算法进行目标位置估计以减少粒子数和计算量。仿真结果表明:与传统的IDSQ算法相比,所提出的算法能够在保证一定跟踪精度的基础上,有效降低网络的能量消耗,提高网络寿命。     

Rigid elliptical cross-section ogive-nose projectiles penetration into concrete targets

The elliptical cross-section ogive-nose projectile (ECOP) has recently attracted attention because it is well suited to the flattened shape of earth-penetrating weapons. However, the penetration performance of ECOPs has not been completely understood. The objective of this study was to investigate the pene-tration performance of ECOPs into concrete targets using a theoretical method. A general geometric model of ECOPs was introduced, and closed-form penetration equations were derived according to the dynamic cavity-expansion theory. The model was validated by comparing the predicted penetration depths with test data, and the maximum deviation was 15.8％. The increment in the penetration depth of the ECOP was evaluated using the proposed model, and the effect of the major—minor axis ratio on the increment was examined. Additionally, the mechanism of the penetration-depth increment was inves-tigated with respect to the caliber radius head, axial stress, and resistance.     

Bionic stab-resistant body armor based on triangular pyramid structure

A stab-resistant substrate was designed and realized with a triangular pyramidal structure, inspired by the biological armor model in nature. The stab-resistance behavior and dynamic response mechanisms were studied through numerical simulation and experimental testing of a knife impacting a substrate, and an optimal structural design was obtained accordingly, with a tilted angle of 22.5° and optimal thickness of 1.2 mm. It was shown that the triangular pyramidal structure generated twice the internal energy of the knife than the flat substrate due to the dispersing effect of the structure. The force parallel to the inclination caused a significant scratch on the substrate surface, while the force perpendicular caused obvious substrate deformation. A new riveting method was used to form the total layer, which passed the GA 68—2008 standard. The stab-resistant clothing coupled with the reduced wearing burden could provide effective protection and avoid fatal injuries on security personnel working in dangerous environments. The method provided may enlighten the future design and manufacturing of stab-resistant clothing.     

浅议陆军合成旅装备一体化联合检验

近年来,装备试验深入推进。作为装备试验领域的最高形式,装备一体化联合检验已经成为陆军合成旅装备试验的新趋势和新常态。本文从装备一体化联合检验的概念入手,简要阐述了以作战效能、作战适用性、体系适用性和在役适用性为主的“一能三性”,从装备体系效能的联合检验、装备体系运用的具体检验和陆军合成旅的综合检验三个方面深入理解和认识装备一体化联合检验,提出了立足联合作战、立足贴近实战、紧盯短板弱项、聚焦摸清底数等四个需要重点关注的问题,以为陆军合成旅装备一体化联合检验的深入开展提供理论参考和借鉴。     

群时延傅里叶分解模型及其估计方法

建立了基于三角函数级数的群时延模型,并理论证明了仅采用有限阶数的三角函数群时延即可表征任意群时延对信号相关峰的影响。在此基础上,通过测量信号相关峰,并与不同三角函数群时延组合下的相关峰进行匹配搜索即可估计群时延的三角函数分解级数,从而估计得到相关峰影响等效的群时延特性。仿真中,采用该方法估计得到的群时延特性对滤波器进行修正后,信号相关峰与经过滤波器之前的信号相关峰高度吻合,时延估计偏差在0.1 ns之内。     

基于"网云端"的新型指挥控制系统体系结构建模

指挥控制系统是综合电子信息系统的核心,是作战效能的"倍增器"和作战指挥的"神经中枢".从"网-云-端"的结构出发,分析了新型指挥控制系统的总体架构和组成关系;通过分析美国国防部体系结构框架(DoDAF2.0),提出了基于DoDAF2.0的新型指挥控制系统体系结构建模流程;采用结构化和面向对象相结合的方法,设计了新型指挥控制系统作战视角、服务视角、能力视角以及系统视角的关键模型,为系统的具体设计与开发、系统评估与分析提供可靠的模型支持.     

寿命型产品序贯试验方案计算与分析

序贯试验方案判决概率解析表达式往往较为繁琐,给深入理解序贯试验方案带来了一定的困难,不利于工程中试验组织实施.针对上述情况,对序贯试验方案基础模型开展了研究.结合序贯试验方案判决准则,描述了判决时刻与产品故障数之间的关系,并利用泊松分布建立了接收-拒收判决概率模型;利用判决概率模型给出了序贯试验方案常见特征量(双方风险...