一种声纳浮标无线传感器网络中的目标定位方法

对声纳浮标无线传感器网络进行了介绍;针对声纳浮标无线传感器网络中对目标的定位问题,提出了质心法和Bounding Box法两种解决方法,并给出了计算模型及坐标变换公式;质心法和Bounding Box法,原理简单,计算量小,符合无线传感器网络硬件资源有限、电源能量有限的特点;对质心法和Bounding Box法进行了仿真模拟,结果表明了这两种方法的定位效果受网络中节点探测半径的影响,Bounding Box的定位效果优于质心法.     

弹药集装单元储存静力学有限元分析

以简单的六面体结构为基础,以“铝板-聚氨酯泡沫材料-铝板”复合板材为弹药集装单元的主体材料,结合弹药集装单元的承载能力要求,建立弹药集装单元的基本模型。通过其在储存状态下的静力学有限元分析,了解3种不同堆垛情况下,弹药集装单元的应力与应变情况,为进一步研究弹药集装单元结构强度提供理论依据。     

海上多无人机协同交叉定位的优化配置方法

针对多部无人机协同交叉定位,考虑无人机安全距离、通信距离和动力学约束条件下,解决多部无人机自动实现对飞行速度和角度的优化配置问题.提出了多机协同测向交叉定位方法,该方法先根据几何稀释度精度建立了不等式约束下的无人机运动参数单目标优化模型,再利用惩罚函数法将优化模型转换为无约束条件的极小值求解问题,最后利用粒子群优化算法获得各无人机飞行速度和角度估计值.仿真试验表明,该方法对不同无人机阵型和辐射源运动状态具有较强的适应性,相比直线飞行配置方法,其定位精度有较大的提高.     

基于数据驱动的自学习防空火力控制技术

立足打赢未来智能化战争的作战需求,提高目标探测识别、运动参数估计的实时性和准确性,解决自主拦截决策建模难度大、决策结果稳定性差等问题,通过引入数据挖掘、深度学习、神经网络等人工智能技术,重点开展基于大数据的多类型目标状态空间模型分析、多探测模式下的目标融合识别技术、基于卷积神经网络的射击诸元修正等,研制一套自学习防空火力控制系统,有效弥补传统防空火力控制技术在时敏目标状态空间模型、大闭环校射、协同信息处理、控制决策等环节的不足,提升火控系统自修正、自学习能力,为武器装备向无人化智能化方向发展提供技术支撑.     

Study of high-speed-impact-induced conoidal fracture of Ti alloy layer in composite armor plate composed of Ti-and Al-alloy layers

In order to understand the mechanism of conoidal fracture damage caused by a high-speed fragment-simulating projectile in titanium alloy layer of a composite armor plate composed of titanium- and aluminum-alloy layers, the ballistic interaction process was successfully simulated based on the Tuler-Butcher and GISSMO coupling failure model. The simulated conoidal fracture morphology was in good agreement with the three-dimensional industrial-computed-tomography image. Further, three main damage zones (zones I, II, and III) were identified besides the crater area, which are located respectively near the crater area, at the back of the target plate, and directly below the crater area. Under the high-speed-impact conditions, in zone II, cracks began to form at the end of the period of crack formation in zone I, but crack formation in zone III started before the end of crack formation in zone II. Further, the damage mechanism differed for different stress states. The microcracks in zone I were formed both by void connection and shear deformation. In the formation of zone I, the stress triaxiality ranged from-2.0 to-1.0, and the shear failure mechanism played a dominant role. The microcracks in zone II showed the combined features of shear deformation and void connection, and during the for-mation process, the stress triaxiality was between 0 and 0.5 with a mixed failure mode. Further, the microcracks in zone III showed obvious characteristics of void connection caused by local melting. During the zone III formation, the triaxiality was 1.0-1.9, and the ductile fracture mechanism was dominant, which also reflects the phenomenon of spallation.     

Numerical simulation study on penetration performance of depleted Uranium (DU) alloy fragments

Due to its high strength, high density, high hardness and good penetration capabilities, Depleted ura-nium alloys have already shined in armor-piercing projectiles. There should also be a lot of room for improvement in the application of fragment killing elements. Therefore, regarding the performance of the depleted uranium alloy to penetrate the target plate, further investigation is needed to analyze its advantages and disadvantages compared to tungsten alloy. To study the difference in penetration per-formance between depleted uranium alloy and tungsten alloy fragments,firstly, a theoretical analysis of the adiabatic shear sensitivity of DU and tungsten alloys was given from the perspective of material constitutive model. Then, taking the cylindrical fragment penetration target as the research object, the penetration process and velocity characteristics of the steel target plates penetrated by DU alloy frag-ment and tungsten alloy fragment were compared and analyzed, by using finite element software ANSYS/LS-DYNA and Lagrange algorithm. Lastly, the influence of different postures when impacting target and different fragment shapes on the penetration results is carried out in the research. The results show that in the penetration process of the DU and tungsten alloy fragments, the self-sharpening properties of the DU alloy can make the fragment head sharper and the penetrating ability enhance. Under the same conditions, the penetration capability of cylindrical fragment impacting target in vertical posture is better than that in horizontal posture, and the penetration capability of the spherical fragment is slightly better than that of cylindrical fragment.     

GPS接收信号中线性扫频干扰的抑制

研究了阵列接收的GPS接收信号中线性扫频(LFM)干扰的抑制问题。LFM信号瞬时频率的估计是抑制干扰的关键,而要准确估计信号瞬时频率,必须抑制接收信号时频分布中交叉项干扰。本文对接收信号矢量进行白化,得到信号矢量白化后的空时频分布(STFD)矩阵。文中推出一个与传统方法获得的判决变量不同的判决变量,用该判决变量可以更加清晰地选出LFM信号在时频分布中的自项。根据时频脊点的分布估计LFM信号频率参数以及信号瞬时频率,之后即可根据瞬时频率构建陷波器滤除干扰。仿真表明该方法能够将受交叉项严重干扰的接收信号时频分布映射为清晰的接收信号自项的时频分布,在数据快拍数满足一定要求时可以很好地抑制掉LFM干扰。     

战时装备维修保障资源优化模型

维修资源在抢修过程中的分配决定了抢修活动的平均处理时间和等待时间,针对抢修实施时维修资源的分配,研究资源的优化配置使抢修时间最小的问题.在抢修过程中使抢修时间最小的目标和约束条件下,提出了资源配置优化的排队模型,并结合遗传算法给出了求解最优配置模型的方法,通过实例分析说明了模型和方法的应用情况.资源配置优化模型和算法已成功应用于集群装备保障决策系统的开发.     

脉冲幅度特性分析的相控阵雷达识别技术

为有效识别相控阵雷达,提出了一种基于截获脉冲幅度特性分析的识别方法。该方法根据相控阵雷达与常规机械扫描雷达的扫描方式存在很大差异的特点,建立侦察设备截获脉冲的幅度模型,并通过仿真得到不同体制雷达被截获的脉冲幅度特性。然后求得不同体制雷达被截获的脉冲序列幅度特性与正弦序列幅度特性的相似系数,以此为依据来识别相控阵雷达。最后,通过比较实验证明了该方法的有效性。     

基于行为建模的移动代理性能评估

针对移动代理的分布式应用性能评估需求,建立了移动代理生命周期中主要行为的网络负载模型和时间消耗模型.在3种典型分布式应用想定下,分析了基于C＼S模式和移动代理模式的应用实现基本过程,对两种模式下的网络负载和执行时间进行了仿真比较,结果证明了在访问节点数量较多,网络传输速率较低时,移动代理模式的具有更好性能.