机载雷达诱偏反辐射导弹技术研究

讨论了被动单脉冲导引头主波束内同时存在两个干扰源时，导引头对干扰源的跟踪特性，包括静态跟踪特性和动态跟踪特性。重点分析了在动态跟踪下有源诱饵对抗ARM与机载雷达和诱饵的飞行速度的关系，通过仿真也验证了选取合适的速度诱偏ARM的可行性。     

有源诱饵对抗反辐射导弹技术研究

文中对反辐射导弹进行了简要介绍．分析了反辐射导弹的特点与局限性，论述了多个诱饵偏ARM的原理，概括地说明了诱饵抗反辐射导弹ARM(Ant iRadiation Missile)的干扰技术，阐述了诱偏技术实现的必要条件，并进行了模拟分析，对两个及三个诱饵诱骗系统进行了仿真。仿真结果表明，有源诱饵抗ARM不仅与诱饵的频率、功率和信号形式有关，还与诱饵和被保护雷达之间的配置间距有关，3个诱饵的诱偏效果显然比2个的效果好。仿真结果验证了理论分析的正确性和干扰的真实性，证明了采用有源诱饵与雷达组成多点源诱偏系统对抗反辐射导弹是一种有效的方法。     

多点有源诱饵系统对抗ARM的布局仿真

对用雷达和诱饵组成的有源诱偏系统对抗反辐射导弹(Anti-Radiation Missile ,ARM)的技术方法进行了分析.在给出其基本原理的条件下,分别对两点源、三点源和四点源有源诱偏系统的一种比较实用的布局效果进行了仿真分析,给出了仿真图.     

两点源诱偏条件下反辐射导弹毁伤能力评估

针对反辐射导弹受到两点源诱偏的情况,建立两点源诱偏模型,并根据反辐射导弹毁伤目标的特点,建立毁伤能力评估模型。最后,将两点源诱偏条件下的突防过程与命中、毁伤过程作为一个整体,通过对导弹整体攻击过程的仿真,分析不同条件下,两点源诱偏反辐射导弹时,反辐射导弹的毁伤概率。此毁伤概率可以进一步体现两点源诱偏条件下反辐射导弹的突防能力,为此类对抗措施条件下突防能力的研究提供方法。     

诱偏抗反辐射导弹的导引信号模型及仿真

文中给出了单个辐射源作用情况下的导引信号模型,针对辐射源的几种配置情况进行了诱偏效果仿真.通过理论分析和仿真试验确定了从雷达站工作切换到诱偏源工作时ARM与雷达站的距离,以及各辐射源之间切换时间间隔等参数.文中通过仿真所得的结论,为战场抗反辐射导弹解决方案提供了非常有价值的参考.     

机动式诱偏系统抗ARM可行性仿真研究

反辐射导弹(ARM)对地面雷达构成严重威胁,提出了一种“告警+机动诱铒”对抗ARM的方案,既可以保护雷达,又能使诱饵免受攻击.在分析其基本工作原理的基础上,运用时间差分法构建ARM攻击地面雷达的弹道数学模型,并进行仿真.从ARM落点位置、ARM导引头视角、ARM弹道曲率等方面仿真验证了该方案的可行性和有效性,对于如何对抗ARM提出了一种新的解决思路.     

抗击反辐射导弹武器的指挥策略研究

结合水面舰艇作战特点，从雷达诱偏和舰空导弹硬抗击两个方面入手，对抗击反辐射导弹武器时的编队配置、引诱条件、引诱时机及指挥策略进行分析探讨，提出以积极的防御手段综合抗击来袭的雷达制导反辐射导弹．     

反辐射导引头抗诱偏技术研究

现有反辐射导引头抗诱偏技术主要是着眼于提高反辐射导引头自身的分辨率,以实现尽早区分目标雷达与诱偏源的目的。文中从另一个角度人手,在不提高反辐射导引头分辨率的前提下．基于无源被动定位技术、虚拟导引头技术以及故障检测技术给出了一种新的抗诱偏方案。该方案首先利用无源被动定位技术估计出目标惯性系下的坐标,再用虚拟导引头技术计算出视线角等制导信息输出,并利用故障检测技术将导引头输出与虚拟导引头输出进行比较以确定反辐射导引头是否被干扰,如果被干扰则切换到虚拟导引头制导。最后对一个例子进行了仿真,初步验证了该方案的有效性。     

反辐射导弹智能记忆抗诱偏技术研究

提出一种基于目标识别和超分辨测向的反辐射导弹智能记忆抗诱偏方法.针对多信号条件下,反辐射导弹对目标辐射源的识别和抗诱偏摧毁问题,分别采用基于谱特征的信号识别方法和小型圆阵基础上的超分辨测向算法,设计了系统框图,给出了方法工程实施方案.仿真证明该方法能够有效识别多种信号,测出诱偏条件下多个信号源位置信息,能够抗关机、抗诱偏.     

有源诱偏系统的天线空域极化特性对比分析

研究了有源诱偏系统中雷达与诱饵天线的空域极化特性。利用FEKO软件仿真得到了抛物面雷达天线和宽波束角锥喇叭诱饵天线的极化状态在不同空域指向上的分布,讨论了两种天线的空域极化特性在给定观测条件下的差异。仿真结果表明,在较大的观测区域下,诱饵天线的极化状态分布相对比较集中,而雷达天线的极化状态比较散乱。研究结果为反辐射导弹利用天线空域极化特性提高抗诱偏能力提供了理论依据和支持。     

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.     

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。     

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.     

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.     

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.     

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.     

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.     

Unscented Kalman Filter for Autonomous Warship Attitude Determination

To address a problem of autonomous attitude determination algorithm using gravitational field and geomagnetic field observation, a new recursive optimization autonomous attitude estimation algorithm is proposed. The algorithm is based on unscented Kalman fiher(UKF), and can synchronously provide the attitude rate information. The simulated results show that the measurement precision of the method could be increased by 2 times compared to that of the common methods.