弹载飞行控制软件重用技术的发展趋势研究

弹载飞行控制软件是导弹的核心软件,应用软件重用技术可以有效降低软件产品开发和维护的成本,压缩研制周期,保证软件设计质量的稳定性。本文归纳梳理了弹载飞行控制软件的特点,描述了其应用软件重用技术的现状。并据此对软件重用技术的未来发展趋势做了展望。     

多特征融合的异视角目标关联算法

目标关联在协同多目标探测中具有重要意义,受视角变换等因素的影响,传统目标关联算法在异视角目标观测情况下效果较差。本文提出了一种基于拓扑特征与颜色特征融合的无人机协同侦查目标关联算法,通过利用无人机提供的位置、姿态及其搭载传感器获得的多维特征数据,提取出目标的拓扑特征及颜色特征,并通过D-S证据理论融合多维特征,完成对异视角目标群的关联。实验表明,这种算法框架能够有效帮助无人机完成对目标群的关联任务。     

Electromagnetic spectrum chipless radio frequency identification: A review

Over the past few years, Radio Frequency IDentification (RFID) has stridden significantly due to its adoption in many business and daily life activities. RFID empowers end-to-end and item-by-item visibility, letting the customers or decision-makers effectively trail the personnel and resources for improved management. Significant research and development in this area have transformed the inexpensive, miniaturized technology of RFIDs without chip inside. Chipless Radio Frequency IDentification (CRFID) is a unique wireless technology based on radar principle to sense, identify, and track the objects. CRFIDs are simplified and miniaturized tags of traditional RFID, which can widely be used in small and cheap objects/applications in our daily life. This paper reviews the definition, principle, and most recent development in CRFIDs. Based on the reported researches, the ElectroMagnetic Spectrum (EMS) method is typical, which has been concerned by many RFID researchers. Therefore, this paper reviews different types of EMS CRFID tag and classifies these tags based on structure design emphasizing their significant geometries in comparison with performance parameters. Antenna and coding methods of the EMS CRFID are also elaborated, contrasting the tag capacity and coding performance. Finally, we briefly summarize the challenges and limitations in this emerging field and look forward to the prospects of future CRFID.     

W波段交错双栅色散测量与比较

采用谐振法,基于小孔耦合设计了W波段矩形槽交错双栅色散测试方案。考虑了倒圆角带来的影响,采用精密计算机数控技术(CNC)工艺加工慢波结构进行测试,获得了辨识较高的谐振峰,得到了0-p 相移范围内所有对应的本征谐振点。基于小孔耦合谐振法的仿真值与严格谐振法、准周期法的仿真值相比最大偏差0.1%,证明了色散测试方案的合理性。基于小孔耦合谐振法的实测值与仿真值相比最大偏差0.3491%,充分说明慢波结构的加工精度满足工程应用需求,这些结果为深入开展下一步试验打下良好基础。     

基于多层非负局部Laplacian稀疏编码的图像分类

针对单层稀疏编码结构对图像特征学习能力的局限性问题,提出了一个基于图像块稀疏表示的深层架构,即多层融合局部性和非负性的Laplacian稀疏编码算法（MLLSC）。对每个图像平均区域划分并进行尺度不变特征变换（SIFT）特征提取,在稀疏编码阶段,在Laplacian稀疏编码的优化函数中添加局部性和非负性,在第一层和第二层分别进行字典学习和稀疏编码,分别得到图像块级、图像级的稀疏表示,为了去除冗余特征,在进行第二层稀疏编码之前进行主成分分析（PCA）降维,最后采用多类线性支持向量机进行分类。在四个标准数据集上进行验证,实验结果表明,MLLSC方法具有高效的特征学习能力,能够捕获图像更深层次的特征信息,相对于单层结构算法准确率提高了3%~13%,相对于多层稀疏编码算法准确率提高了1%~2.3%;并对不同参数进行了对比分析,充分展现了其在图像分类中的有效性。     

一类非线性系统的神经网络自适应算法研究

讨论了神经网络在非线性系统控制中的应用.针对一类典型的非线性系统,基于波波夫超稳定性理论,推导出了保证系统稳定性的神经网络学习算法,设计了神经网络模型参考自适应控制器,以改善非线性被控对象跟踪参考模型输出的跟踪效果,并以此为依据进行了MATLAB仿真.对电弧炉三相电极调节系统的仿真结果表明,这种神经网络自适应控制系统具...     

Oxidation degradation and mechanical reduction on C/SiC composites with artificial notch defects

Continuous carbon fiber reinforced silicon carbide matrix composites (C/SiCs) have been widely used in aeronautic and astronautic fields because of their more attractive high temperature properties with less structural weight. However, reinforcing carbon fibers are susceptible to oxidation especially when the notch defects (ND) expose them to air. Mechanical tests, microstructural characterization combined with computed tomography (CT) were performed to explore the effect of the ND on the oxidation behavior and residual properties of the C/SiCs. Results showed that, before oxidation, the remaining bending strengths of the C/SiCs with even 5 ND numbers maintained still above 93%, indicating that increase of the ND numbers had little effect on mechanical properties. However, after oxidation at 700 °C, weight loss ratio of the C/SiCs with the ND numbers of 0, 1, 3 and 5 increased from 1.01% to 3.73%. It suggested that the more the ND numbers, the greater the proportion of carbon fiber exposed to air, and the less the oxidation resistance. Meanwhile, the residual bending strength remaining ratio of the C/SiCs largely reduced from 83.7% to 60.7% with the increase of ND numbers. It pointed out that the ND induced oxidation degradation of the reinforcing fiber caused higher sensitivity to the mechanical strength of the C/SiCs, and with the increase in the ND numbers, the strengths decreased more obviously.     

全捷联导引头视线角速度STCKF提取技术

传统的平台导引头可以通过物理跟踪回路直接提取导弹制导所需的视线角速度信息,采用全捷联结构后,导引头失去了直接测量视线角速度的能力,视线角速度需要通过数字计算的方法来提取。针对全捷联导引头精确制导技术工程应用中的问题,首先给出了视线角速度提取方案,推导得到视线角速度估计模型,鉴于估计模型的强非线性,采用强跟踪容积卡尔曼滤波算法对视线角速度进行估计。结合小型空面导弹的典型使用条件,通过弹道仿真对视线角速度估计算法的有效性进行了验证。仿真试验表明:导引头在末制导段捕获目标后,能迅速消除滤波初始误差,准确跟踪真实的弹目视线角和视线角速度变化。为验证将滤波输出作为制导信息的可行性,考虑激光半主动全捷联导引头的典型干扰,用蒙特卡洛打靶方法对导弹制导精度进行了考核,1 000次打靶结果显示,对静止目标的制导精度为0.58 m（CEP）,对运动目标的制导精度为0.84 m（CEP）,满足精确制导武器的制导精度要求。     

隐身科学发展中的若干问题刍论

简要说明了隐身技术的内涵及其在现代战争中的重要性,介绍了隐身科学的几个主要特点和发展方向,论述了隐身科学发展中的有关技术哲学问题及其研究方法.     

美海军对抗巡航导弹攻击方法分析

航母战斗群是美军的海上主战力量,为了防御巡航导弹攻击,研制了大量电子对抗装备,形成了严密的防御圈。主要分析了美军航母战斗群反巡航导弹攻击力量的主要组成、主要电子装备的部署形式,并对电子装备的战技指标进行了分析。