舰载指控系统的软件故障树分析

在现代舰载指控系统的设计中软件所占比例日益增加,软件故障对系统可靠性的影响也更突出,需要对软件故障进行分析。根据现代舰载指控系统的特点,采用软件故障树分析方法,以舰载指控系统的软件系统故障为根节点,从上至下找出导致软件系统故障的所有可能因素,分析其因果逻辑关系,最后建立了现代舰载指控系统的软件故障树。软件故障树以图形演绎的方法直观地反映了现代舰载指控系统的软件故障特性,有助于采取有效措施提高系统的可靠性。     

BDS在低轨卫星编队高精度相对轨道确定上的应用分析

分析基于北斗卫星导航系统(BeiDou satellite navigation System, BDS)的低轨卫星编队相对轨道确定问题,但由于缺乏实测数据,通过仿真实验展开研究。结果表明,500 km空域平均可视BDS卫星数约为9.7,由于地球静止轨道(GeoStationary earth Orbit,GEO)卫星和倾斜地球同步轨道(Inclined GeoSynchronous earth Orbit,IGSO)卫星的存在,亚太地区的可视BDS卫星数明显偏多。仅考虑观测噪声的影响时,基于BDS的相对定轨精度可达0.74 mm,加入星历误差的影响,对近距离编队系统的相对定轨而言,GEO卫星数米的星历误差可以忽略,但当星间距离增大到约200 km时,GEO卫星单差后的星历误差可达厘米量级,GEO+IGSO+中圆地球轨道(Medium Earth Orbit,MEO)卫星和IGSO+MEO卫星求解的相对轨道精度分别为1.09 mm和0.96 mm,GEO卫星的加入使得精度下降了13.54%。在其余误差得到有效处理后,BDS的相对定轨精度可达亚毫米量级,且无明显区域差异,GEO卫星和IGSO卫星能提高近距离编队系统的全球相对定轨精度,未来BDS将广泛应用于低轨卫星编队相对轨道确定。     

基于感知信息共享的C2网络特征分析

指挥控制（C2，Commandand Control）关系网络连接数的增加会增强指控节点之间的信息共享，但也会增加节点信息处理和交换负荷，如果达到一定程度，则会造成节点本身的“信息过载”从而影响C2网络性能。对此，通过研究C2网络在两种不同处理方式下的共享感知信息平均提交时间，用网络节点响应时间的均方差表征一个C2网络的共享态势感知时间的一致性，最后对两种不同结构C2网络特征参数的计算，说明了网络连接增加会导致信息提交时间的延长，但一致性会增强。     

舰空导弹作战使用及指挥控制

从作战使用角度出发 ,对作战使用研究的目的、细目进行了界定 ,对作战过程中作战人员的职责、作战组织、作战实施和指挥控制问题进行了剖析 ,为最终制定作战指挥程序和编制协同任务表奠定了基础。最后指出了新的研究方向     

基于分布式网络化指控体系的协同跟踪设计

针对当前干扰防空环境下的作战特点，通过对网络化作战需求的分析，建立了一种分布式的网络化指挥控制体系架构，并结合协同跟踪的具体作战运用，设计了基于此分布式体系的协同跟踪作战流程，并建立了效能验证模型。对比一般的集中式指挥控制体系，基于分布式的体系具有生存性强、作战使用效能高的特点。     

面向目标对峙跟踪的四旋翼协同编队控制方法

针对多四旋翼编队飞行过程中对地面目标对峙跟踪、几何队形生成、稳固保持和协同抗干扰问题,设计了一种可应对外部环境干扰和气动参数不确定性的多四旋翼主从式协同目标跟踪方法。首先,建立存在外部干扰以及参数不确定性的四旋翼运动学/动力学模型;其次,基于Lyapunov导航向量场设计领航者的对峙跟踪航迹使得领航者以固定对峙半径实现对目标的盘旋跟踪;然后,构造多四旋翼分布式位置保持控制器,为后续姿态控制器构造提供必要的期望指令;最后,针对四旋翼外部环境干扰和气动参数不确定性设计基于自抗扰控制的多四旋翼姿态跟踪控制器。仿真结果表明所提方法可以在局部智能体通信的前提下实现对地面目标的对峙跟踪,显著改善四旋翼编队系统的抗干扰能力,提升干扰环境下多四旋翼编队几何构型的稳固性。     

歼击机空战占位的模糊神经网络方法

在歼击机空战中 ,首先占据有利的攻击位置 ,是夺取空战胜利的重要保证 ,不论是近距离格斗 ,还是超视距空战均如此。在未来 2 1世纪信息战环境下的空战 ,为了减轻飞机员的负担 ,必须根据战场态势 ,利用智能化方法 ,为飞行员提供正确操纵飞机达到有利攻击位置的辅助决策指示。本文研究了先敌占位的模糊神经网络方法 ,仿真证明这种方法是有效的     

Formation and impact-induced separation of tandem EFPs

The formation and separation behaviors of tandem EFPs are studied by the combination of experiments and simulations. The results show that different formation and separation processes can be obtained by adjusting the double-layer liners, and simulations agree with experiments well. Then, the interaction process between the two liners is discussed in details, and the formation and separation mechanism are revealed. It can be found that there are four phases in the formation and separation processes, including impact phase, propulsion phase, slide phase and free flight phase. During the impact phase, the velocities of two liners rise in turns with kinetic energy exchange. In the propulsion phase, the axial impact becomes insignificant, but the radial interaction between two liners influences the appearance of tandem EFPs. Meanwhile, it should be mentioned that the inner surface of foregoing EFP remains to be in contact with the outer surface of following EFP in the propulsion phase, and the following one would continue to push the foregoing one for about 10μ to 20 μs, causing the velocities of following and foregoing EFPs gradually decreasing and increasing respectively. In the slide phase, an obvious relative movement occurs between the two EFPs, and there would be barely kinetic energy exchange. Then, the two EFPs separate gradually and get into the phase of free flight. Generally, if the outer and inner liners have the same thickness, the outer copper-inner copper liners form two long EFPs, the outer copper-inner steel liners become a foregoing short steel EFP and a following long copper EFP, and the outer steel-inner copper liners produce a foregoing long copper EFP and a following conical steel EFP. In addition, thickness match also has an important impact on formation appearance and separation process for both outer copper-inner copper liners and outer steel-inner copper liners. With the thickness ratio of outer liner to inner liner decreasing, the length and length-diameter ratio of both foregoing and following EFPs increase gradually.     

A nation-in-the-making,in arms: control of force,strategy and the Ukrainian Volunteer Battalions

At the core of waging war and strategy is the creation, control and use of force. This article investigates the volunteer battalions that mobilized in Ukraine during the spring of 2014. It contextualizes the volunteer phenomenon and focuses on the state strategies to establish control over these militias. As ambiguous entities arising from a situation characterized by rapid social change – revolution and war – the volunteer battalions threatened existing hierarchies and questioned state authority. The situation was exacerbated by the war, which deviated from the expectations of Ukrainian combatants and Western military observers alike. The state nevertheless enjoyed a modicum of success in reining in the militias through four strategies of undermining, co-option, incorporation and coercion. While predominantly integrated into a more rigid category of paramilitary forces, the volunteers continue to play a role in both the Ukrainian society and security sector to the unforeseeable future.     

回路控制遥测数据的注入仿真和输入序列的重建

分析了回路控制数学模型对遥测数据输入误差的响应和积累 ,构造了回路控制计算输入序列的误差补偿算法 ,并且证明了误差补偿算法的数值稳定性。