基于遗传算法的协同航迹规划算法研究

文中针对无人飞行器的协同航迹规划,提出了一种基于遗传算法的协同航迹规划算法。该算法采用双层进化机制,不同的飞行器生成各自的可行航迹种群用于下层进化;对不同飞行器的可行航迹进行组合形成协同航迹组种群用于上层进化。实验表明,该算法能够在较短的时间内规划出较优的协同航迹组;同时,由于下层进化中利用了状态表征矩阵和新的引导信息,使得收敛速度比标准遗传算法更快。     

多无人飞行器在线协同航迹规划技术综述

多飞行器协同作战是未来无人飞行器作战的重要趋势。在线协同航迹规划是实现协同作战的重要手段。系统地梳理了近年来多无人飞行器协同航迹规划领域的研究现状,从规划框架、协同规划模型、规划框架和优化方法等方面进行总结,归纳了现有协同航迹规划的主要手段,指出了其中存在的问题,并分析了未来协同航迹规划领域的发展趋势。     

一种海上无人飞行器的快速航迹规划方法

针对海上无人飞行器的快速规划问题,提出了一种基于几何关系的扩展树策略的快速规划方法。以规避禁飞区为主要思想,快速定位到航迹中的禁飞区,通过扩展树的方法绕过禁飞区,从而达到快速规划的目标。实验结果表明,该方法可用于海上无人飞行器的实时航迹规划。     

基于协进化多子群蚁群算法的多无人作战飞机协同航迹规划研究

协同航迹规划是有效提高多无人作战飞机( UCAV)协同作战效能的关键技术之一。分析了多UCAV协同航迹规划问题中的空间协同约束、时序约束以及任务时间约束，建立了基于“协同系数”的协同航迹性能评价指标；在此基础上，通过引入蚂蚁子群间的协同进化策略，并对蚁群算法状态转移规则、信息素更新机制进行了改进，设计并实现了基于协进化多子群蚁群算法的协同航迹规划算法。仿真实验结果表明：本文方法能够很好地处理多UCAV协同任务中的各类约束条件，是一种有效的协同航迹规划方法。     

多平台反舰导弹协同航迹规划

为了提高反舰导弹突防概率，基于遗传算法提出了一种多平台反舰导弹协同航迹规划算法．首先，重点讨论了协同航迹的评价问题．为了达到同步攻击目的，同时使飞行代价最小，研究提出了随种群进化而变化的时间协同度评价策略．其次，探讨了多平台反舰导弹协同航迹规划算法的分解．最后，通过仿真算例校验了该算法寻优得到的诸航迹不仅可使导弹实现协同攻击，而且可以很好地规避威胁．     

无人飞行器海上航迹规划差分进化算法研究

为研究海洋环境下的无人飞行器（UAV）航迹规划问题,提出了一种基于差分进化算法（DE）的航迹规划方法。该方法通过对规划环境进行预处理将岛屿处理成地形威胁区,使问题简化为二维平面规划。采用实数编码方式对航迹进行编码,建立了航迹代价函数的数学模型,从航迹质量、算法稳定性和收敛速度3个方面比较了DE与遗传算法（GA）和粒子群优化算法（PSO)的性能。仿真实验结果表明,所提方法能在复杂的海洋环境下为飞行器规划出一条安全的可飞航迹。     

基于Hopfield人工神经网络的飞行器快速航迹规划算法

针对飞行器在复杂环境下的航迹规划，设计了一种快速Hopfield神经网络规划算法．算法使用基于距离变换的串行模拟构建数值势场，加速了数值势场的传播．在学习过程中，通过调整连接权系数改变局部势场分布．试验表明算法在单处理器上可以进行有效的快速航迹规划，该方法具有较高的效率和环境适应性．     

基于网络图的多航迹快速规划方法

针对飞行器多航迹快速规划展开了研究.在航迹片段构成的网络图的基础上,提出了一种基于遗传算法的多航迹快速规划方法.该方法结合航迹片段和网络图的特点,使用特定的编码方式,快速生成可行的初始航迹,再通过与编码方式相关的遗传算子得到最优航迹.实验结果表明,该方法能快速得到多条飞行航迹,更具有战术选择上的灵活性.     

基于遗传算法的反舰巡航导弹协同航迹规划

针对反舰巡航导弹的协同作战问题,结合遗传算法思想,提出了一种协同航迹规划方法.简述了反舰巡航导弹航迹规划的特点,在此基础上构建了航迹规划模型,规划模型巧妙地把时间协同和方向协同问题转化为航迹代价指标,便于遗传算法求解.仿真结果表明,该方法快速有效,很好地解决了反舰巡航导弹的离线协同航迹规划问题.     

复杂环境下分层递阶多航迹协同规划研究

针对复杂环境下多无人攻击飞行器(UCAV)、多目标协同规划的特点,提出了复杂环境下多UCAV协同规划分层递阶体系架构。该架构可以将长航时精确制导多UCAV协同规划问题分解为若干个相对简单的子问题,有利于该复杂问题的求解。随后对任务层、空间域、时间域分层方法以及迭代求解逻辑流程进行了论述。最后,明确了该体系所需要解决的各项关键技术。     

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.     

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.     

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.     

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.     

Experimental Study on the Small Flyer Initiating Behavior of Fine-grained Explosives

The initiating behavior of fine-grained explosives by small flyer is studied. The diameter of small flyer in this device is 1 ram. The test results indicate that the granularity of explosives has great effect on its flyer initiating sensitivity.The flyer initiating sensitivity of the fine-grained explosives is higher and the critical initiating energy is lower than that of common explosives. For common explosive, the flyer initiating sensitivity increases as the density is reduced. But for the fine-grained explosive, the test results are exactly opposite.     

Passive Acoustic Radar for Detecting Supersonic Cruise Missile

A Passive Acoustic Radar is presented as a necessary complement to electromagnetic wave radar, which will be expected to be an effective means for detecting cruise missiles. Acoustic characteristics of supersonic flying projectiles with diverse shapes are expounded via experiment. It is pointed out that simulation experiment could be implemented using bullet or shell instead of cruise missile. Based on theoretical analysis and experiment, the ““acoustic fingerprint““ character of cruise missile is illustrated to identify it in a strong noise environment. After establishing a locating mathematical model, the technique of acoustic embattling is utilized to resolve a problem of confirming the time of early-warning, considering the fact that velocity of sound is much slower than that of light. Thereby, a whole system of passive acoustic radar for detecting supersonic cruise missile is formed.     

Algorithm for Multi-laser-target Tracking Based on Clustering Fusion

Multi-laser-target tracking is an important subject in the field of signal processing of laser warners. A clustering method is applied to the measurement of laser warner, and the space-time fusion for measurements in the same cluster is accomplished. Real-time tracking of multi-laser-target and real-time picking of multi-laser-signal are introduced using data fusion of the measurements. A prototype device of the algorithm is built up. The results of experiments show that the algorithm is very effective.     

Robust Graded Sliding Mode Tracking Control for Low Speed Spinning Ballistic Missiles

The nonlinear dynamic model of spinning ballistic missiles is established during the first boosting phase of the missile. Based on the conventional backstepping sliding mode control and the assumption of a two time-scale separation of missile dynamics, a graded sliding mode controller is designed with two sub-sliding surfaces which have invariability to external disturbances and parameter perturbations, and a matrix which comprises three first order low pass filters is introduced to prevent ＂explosion of terms＂. Owing to the upper bounds of the uncertainties are difficult to obtain in advance, adaptive laws are introduced to estimate the values of the uncertainties in real-time. Eventually, the numerical simulation results given to show the proposed controller can ensure the steady flight of missiles.