双层介质板开槽弹载宽频带GPS共形天线

针对目前弹载GPS共形天线,在无线电引信特定尺寸和安装环境下工作带宽窄的问题,提出双层介质板开槽弹载宽频带GPS共形天线。该天线采用双层介质板作为天线辐射单元的衬底,通过两种不同介电常数的介质板叠加形成非线性天线基板,其有效磁导率会随频率的升高成平方的减小,这样就可以在不同的频率上对应同一个贴片尺寸,从而拓展了天线的工作带宽。仿真和样机测试结果表明:该天线辐射单元实现了与弹体的共形,工作带宽31 MHz,弹体轴向-58°~+58°范围内天线轴比小于2,实现了天线的圆极化。     

X波段弹箭引信贴片天线集成射频前端

针对无线电引信探测前端电路复杂、频段低、抗干扰能力不强的问题,应用微带贴片天线开槽技术和微波单片集成电路技术设计实现了X波段弹箭引信射频前端.通过微带贴片天线开槽技术有效地减小天线的体积;应用成熟的微波集成电路减小整个组件的系统噪声,简化振荡电路的匹配网络;通过改变压控振荡器控制端输入信号,可以灵活地改变引信的探测频率和探测体制,提高无线电引信抗干扰的能力.试验表明该探测前端性能稳定,体积小,成本低,工艺简单,有利于批量生产.     

超宽带无线电引信天线设计及仿真

为解决超宽带引信发射机与天线带宽、功率匹配的问题,设计了一种超宽带无线电引信天线。借助CST电磁场仿真软件对三角对称振子天线的馈电点和张角天线性能进行了仿真优化,通过分析其驻波比、天线带宽、天线增益和辐射信号幅度,可得出三角对称振子天线的最佳馈电点为三角形顶端、最佳张角为60°以及时域分析法更适合于超宽带无线电引信天线的仿真与优化。     

导弹无线电引信天线仿真

为了研究电磁干扰对无线电引信的作用效果,需要得到引信天线的S参数。以Ansoft HFSS软件为仿真平台,建立了无线电引信天线模型,通过计算机仿真得到其S参数、电压驻波比（VSWR）和三维方向图。从仿真结果分析出天线的中心频率和带宽与无线电引信的技术参数非常吻合,表明仿真结果真实可信。     

小型化X波段介质加载单极子天线

针对传统单极子天线在X波段体积大,不利于常规炮弹引信小型化的问题,提出了小型化X波段介质加载单极子天线.该天线的辐射单元采用空心棒状结构,通过锥形过渡结构与同轴馈线连接,辐射单元内嵌在介质套筒中与抛物面底板通过台状结构咬合固定.测试表明:天线尺寸相对于传统单极子天线减小30％,带宽增大50％.该天线有利于引信的小型化,可以应用于多种无线电探测引信中.     

引信双频环形微带天线的研究

在对环形微带天线进行电阻加载实现天线小型化的基础上。通过对环形天线的C形开槽，实现了天线的双频带工作。采用基于矩量法的电磁仿真软件IE3D进行优化仿真，给出了一个双频环形微带天线的设计仿真结果，此天线适合在无线电引信系统中应用。     

应用于超高速制导炮弹的介质波导天线

针对传统的分体设计天线不能很好的满足超高速制导炮弹在超高速、高过载环境下的飞行要求,提出了应用于超高速制导炮弹的介质波导天线。该天线采用了天线与无线电引信风帽的一体化设计,天线辐射单元主体采用金属圆波导结构,天线与射频发射链路之间采用绝缘子同轴馈电。在超高速制导炮弹无线电引信有限尺寸空间条件下,完成了天线的高增益和耐高温腐蚀设计,同时保持了传统波导天线工作频带宽、结构简单紧凑和易于加工的特点。实测结果表明,该介质波导天线不仅适用于超高速制导炮弹对外形尺寸的严格要求,而且在抗烧蚀、及探测性能各种测试条件下工作频带宽、增益高,与仿真结果基本一致。     

智能天线在空空导弹无线电引信抗干扰中的应用

针对目前我国空空导弹无线电引信的各种抗干扰技术适用范围窄、抗干扰性能不足的问题，提出了将智能天线技术应用于空空导弹无线电引信的方法，使智能天线在一定的准则下自动地调整其加权矢量，以提高其抗干扰性能，扩大适用范围。通过对多普勒引信抗干扰性能的计算机仿真，证明了智能天线技术在复杂环境下可以较好地提高空空导弹无线电引信的抗干扰性能。     

无线电引信圆形微带天线辐射性能改善方法

针对无线电引信天线提高增益的同时难以保留较大探测角的问题,提出了无线电引信圆形微带天线辐射性能改善方法。该方法设计了可组成环形的新型磁负超材料结构单元,并蚀刻在圆形微带天线主辐射边两侧以提升天线辐射性能。仿真结果表明,加载超材料单元后天线增益提升了0.911 dB,天线E面半功率波束宽度增加了3°,天线H面半功率波束宽度减少了12°,并发现辐射的后向波电平大幅度降低,较好地满足无线电引信对天线的要求。     

近炸引信中的开槽共形定向微带天线

针对近炸引信中贴片微带天线带宽窄及定向辐射性能差等问题,提出了与弹体共形的具有侧向辐射、宽频带的微带天线。该微带天线采用倒方形贴片,在贴片上进行开方形槽,并在槽中加入圆形寄生贴片对天线性能进行优化。仿真与实物测试的结果表明：开槽的共形定向微带天线具有良好的宽带特性,在中心频率7.7 GHz附近方向图具有良好的侧向辐射性能,指标优良且尺寸小,满足近炸引信所需。     

Nitrosation and Nitration of Tetraacetyldibenzylhexaazaisowurtzitane

Tetraacetyldibenzylhitane (TADBIW) was subjected to debenzylation by nitrosating with inorganic materials available commercially to synthesize tetraacetyldinitrosohexaazaisowurtzitane (TADNSIW). TADNSIW was purified, and its structure was determined by FTIR, 1H NMR, MS and element analysis. The debenzylation reaction of TADBIW gave quantitative benzaldehyde as a by-product. This indicates that the reaction produces an imine cation as an intermediate. Hexanitrohexaazaisowurtzitane (HNIW) was prepared from unpurified TADNSIW with the yield over 96.0 % and the purity more than 98.0 %. And the mechanism of the reaction from TADNSIW to HNIW is proposed to be oxidation of nitroso and nitration of acetyl on the molecule of TADNSIW, This reaction system involved is simple, and the reaction can complete within a short time and under mild conditions. The product can be easily to separate and the waste disposed readily.     

Method for Measuring Velocity of Warhead Fragments Based on Photoelectric Detection

For measuring velocity and impacting position of single fragment of warhead, a non-contact measuring method is proposed, in which a six-light-screen array, a position indicator, a multi-channel chronograph and a computer are used.The principle of measurement is described. The key device of the system is a light screen array sensor which consists of six light screens allocated with certain geometrical parameters. When the fragment flies through the light screen array, the time of passing through each of the screens is recorded by the multi-channel chronograph. According to the time data and the geometrical parameters of the array, the velocity vector and the location of the fragment can be calculated immediately. The presented method can be used to locate the fragment and to measure the real velocity on its flying direction. It can also be used to measure the velocity of a fragment swarm after the system is engineered further.     

A Robust Algorithm for Watermarking 2D Vector Maps with Low Shape-Distortions

The technique of watermarking has been introduced into 2D vector maps for many potential applications such as protecting the copyright of important GIS （geographical information system） data and tracing the data source of military maps. In most previous works, although the validity of the map data could be preserved during the embedding procedure, the shape-distortions of the map elements are usually neglected which would tend to degrade the invisibility of the watermarking schemes. A shape-preserving algorithm for watermarking 2D vector maps is presented in this paper. A 1D distance sequence extracted from the original map is adopted as the cover data instead of 2D coordinates. A watermark bit is represented by changing the distributions of the cover data. The embedding procedure induces lower shape-distortions than in former works. Experimental results indicate better invisibility of the proposed scheme, as well as its robustness to certain attacks such as map simplification, interpolation, additive noise and most geometric transforms.     

数码电子雷管中影响点火头性能因素分析

阐述了数码电子雷管中,点火药剂细结晶三硝基间苯二酚铅（LTNR）的制备工艺;从点火药剂的种类、加入黏合剂的质量分数、桥丝直径、点火头的电阻值、防潮漆的蘸涂等方面对点火头性能的影响因素进行了探讨;通过震动试验、并联起爆试验、延期精度检测与考核,试验结果表明：一次性合成的细结晶LTNR是制造数码电子雷管点火头较为理想的点火药剂,按技术要求生产的点火头性能指标能够满足行业标准要求。     

Stability of the Third Generation Intensifier under Illumination

The stability under illumination of transmission-mode GaAs photocathode sealed in the third generation intensifier is investigated by use of spectral response testing instruments. The variations of spectral response with the illumination times under weak and intense illumination are compared. The variations of photoemission performance parameters are also characterized. The results show that during initial several weak illuminations photocathode behaves no evident decay and a maximum sensitivity is achieved, while under intense illumination the sensitivity of photocathode begin to decrease largely at the first illumination. The calculated performance parameters show that the variation of surface escape probability with illumination times is a direct cause of instability of photocathode. It is also found that under intense illumination peak wavelength is moved towards short-wave and peak response is decreased, which shows that the ability of long-wave response of photocathode is decreased.     

Open Rule-setting System Applied to Conceptual Design of Engines

Open rule-setting method advanced in this paper concentrates on providing designers of engines with a convenient way to express their design innovations and develop the expected prototypes in the early CAD stage, and constitute effective models for the following analysis process of CAE and CAPP. The problems arisen in the process of conceptual design with the traditional experience-based development method are analyzed. Based on those analyses, open rule-setting method is presented and some associated technical problems are discussed. The functional framework of open rule-setting system was built as software engineering methods. The speciality of the engine product as a kind of complex product and the requirement of the engine product based on its structural particularity to rule-setting system are considered carefully. A demonstration is supplied to illustrate how the open rule-setting method enhances the efficiency and quality of the engine conceptual design.     

Design and Implementation of One Missile Visual Simulation System Based on OpenGL

The implementation of a missile＇s visual simulation system is explained that is developed with OpenGL（open graphic library） and the flight path and flight carriage in different stages of the missile are displayed. The establishment problems of the 3D scene are circumstantiated including the construction and redeployment of the model, creation of the virtual scene, setting of the multi-viewports and multi-windows etc. The missile＇s data driver, system flow, the modules and their mutual relations of the missile visual simulation system are discussed. The missile flight simulation results and effect of the scenes are given.     

Research on Linux Network Device Driver

By analyzing the working principle of Linux network device driver, discussing the Linux network driver structure and its key technologies, the general network driver structure and its design methodologies in Linux system are summarized. Through modifying the network device driver of Linux device driver 3rd version snull, c and improving the COW technology, the Zero-Copy technology in Linux （kernel version 2.6.11 ） is implemented. In the end, the success test tells us that the thorough analysis of network device driver is the foundation of many applications, and it also provides a certain improvement to a lot of real applications, even to military application development.     

Improvement and Experiment of the Reamer in Vibra Cutter Against Wave Edge of Titanium Sheet Alloy Parts

By analyzing the influencing factors of part quality making of sheet alloy of titanium by vibra cutter, the shape of upper reamer is set as cylinder and wedge-shaped form, and the lower reamer as plain and hemicycle form, and its main structural parameters are defined as well. Then it is validated further that such improved vibra cutter reamer can be used to process curve-edged parts of titanium alloy sheet. The experimental result shows that the titanium alloy sheet parts processed by above equipment have no sharpen angles for convex parts and evident crevasse of concave-edged part. In summary, such improvement can eliminate the free-waved edge and improve the manufacture quality of titanium alloy sheet parts greatly.     

Dynamic Encryption Technology in Ad-hoc Networks

A new dynamic encryption application in ad-hoc networks is proposed. The advantages of this method are its being able to use the previous ciphertext as a seed of a new encryption process, rendering the encryption process effective in all communication process by continuous dynamic key generation together with synchronization, and its capability to cut back on system bandages to a greater extent, which is valuable for the ad-hoc circumstance. In addition, the rationality and effectiveness of this novel encryption method have been verified by the test results.