无人作战飞机自主攻击三维实时轨迹规划研究

以无人作战飞机挂载激光制导武器打击地面目标为研究背景,针对空对地武器投放过程的多约束和强实时性要求,提出自主攻击轨迹规划系统总体框架,建立了激光制导武器可发射区模型;在此基础上结合UCAV动力学约束,提出了一种基于改进A*算法的三维攻击轨迹决策算法。算法结合规划轨迹最优性约束和UCAV平台的运动学约束,选择扩展节点,从而降低了算法的复杂度;结合微积分的思想,取步长足够小,将步长范围内高度变化忽略不计,将UCAV水平方向和垂直方向飞行航迹独立解耦,并结合法向过载进行高度修正,从而有效避免了维数灾难问题。仿真结果表明,该算法能快速获得三维航迹,引导UCAV到达目标可发射区,且UCAV终端状态满足武器发射条件,为构建无人作战飞机自主攻击平台奠定了良好的基础。     

基于多平台实现的UCAV攻击编队自主协作系统设计

为了实现无人战斗机的编队攻击,在深入分析编队协作复杂性的基础上,采用模块化设计,根据高可靠性原则,在V isual C++6.0环境中,提出了一种可以在不同平台中实现功能的UCAV攻击编队自主协作系统的设计方法,并对各个子系统的组成和功能进行了探讨,给出了该系统在整个作战过程中的工作流程,最后对正常攻击、单个任务失败、基于不同平台的系统实现3种情况进行了仿真分析。结果表明,该系统能够在不同的平台中可靠地实现UCAV编队自主协作攻击过程。     

双机协同作战下导弹协同攻击区仿真分析

主要针对单机探测性能对导弹攻击区的限制,对双机协同作战模式下的导弹协同攻击区进行研究,并分析了双机协同攻击时制导约束条件,仿真了两种编队下的导弹协同攻击区。经过仿真分析,双机协同作战模式下导弹协同攻击区大于单机导弹攻击区,更有利于发挥导弹效能。     

基于博弈论的多UCAV对地攻击目标分配

针对多架UCAV对地攻击目标分配问题,首先根据价值属性分别对目标和飞机进行权重分配,在此基础上构建了多UCAV对地攻击目标分配的自主决策函数和协同决策函数,提出了一种基于博弈论的目标分配方法.然后运用该算法进行了实例仿真,仿真结果证明了该算法的可行性和有效性.     

带航路规划的反舰导弹盲目射击 攻击模型及性能研究

 具备航路规划能力的远程反舰导弹的出现,要求发展与之相适应的射击方式.导弹盲目射击的主要思想就是在目标大致位置已知而准确位置未知的情况下发射远程导弹,依靠导弹的火力机动和远距离大扇面搜索,实现对目标散布区的覆盖,实现导弹的自主作战.推导了导弹盲目射击攻击方式的计算模型并进行了仿真,由仿真结果分析了各种因素对攻击方式的影响.结果表明:当导弹数量较少或敌对抗火力较强时,所有导弹应朝目标散布中心射击;当目标散布区较大时,应将导弹平均分配给多个瞄准点.     

远程空空导弹发射问题的研究

在导弹发射技术上,远程空空导弹明显不同于中、近程空空导弹。为解决远程空空导弹的发射问题,文章提出了一种远程空空导弹攻击区的确定方法,建立了估计导弹对目标预测拦截时间的算法,讨论了发射远程空空导弹的信息需求及获取方法,并基于以上研究拟订了发射远程空空导弹的火控算法。最后给定目标随机参数的变化范围,对远程空战过程进行了仿真。大量仿真结果表明,可靠发射、非完全可靠发射和非完全可靠强化发射条件下有不同的成功概率,这种发射条件的火控算法从理论上有效地解决了远程空空导弹的发射问题。     

无人作战飞机任务系统技术研究

先进的任务系统是UCAV执行作战任务的核心。本文从功能层、物理层和技术实现层三个层面论述了UCAV任务系统方案：在功能层上，该方案采用操控／自主攻击方式，既可由地面控制站操作员操纵，执行作战任务，也可由UCAV任务系统对目标进行自动识别、威胁判断、攻击排序及火力分配，自主完成攻击及对威胁的规避任务；或者由操作员指定攻击目标后，任务系统自动规划飞行轨迹和飞行操作指令，由飞控系统控制UCAV自主飞行到最佳攻击区域完成对目标的攻击。在物理层上，任务系统由机载任务系统、地面控制站两大部分组成。在技术实现层上，涉及的关键技术主要有任务规划技术、传感器数据处理与信息融合技术、传感器管理技术、态势评估与战术决策技术、自主攻击技术等。     

后向攻击技术方案的对比与选择

以空战前向攻击为参照，以对比的方式分析，论证了导弹越肩发射后向攻击和后向发射后向攻击技术方案的特点和存在的问题，在此讨论的基础上，提出了选择空战导弹后向攻击技术方案的倾向性意见。     

基于贝叶斯优化算法的UCAV编队对地攻击协同任务分配

针对UCAV编队对地攻击协同控制决策优化问题,首先构建了UCAV编队对地攻击任务分配的自主价值优势矩阵.在此基础上依据多人冲突理论分别对双方以及本机编队进行权重分配;建立了UCAV编队对地攻击协同任务分配的整体价值优势矩阵,由此根据决策变量与约束条件构建了任务分配问题的数学模型.然后应用贝叶斯优化算法对该模型进行了优化分析.仿真实例表明,所建协同任务分配模型能够反映编队协同控制决策的重要性,而且应用贝叶斯优化算法能够很快收敛到全局最优解,能有效地解决UCAV编队对地攻击的协同任务分配问题.     

UCAV近距作战雷达规避轨迹规划研究

研究了无人作战飞机(UCAV)自主对地攻击轨迹规划问题。首先,建立了考虑发动机燃油消耗、飞行约束和武器投射终端约束的多约束模型,研究了UCAV动态雷达威胁问题,建立了随姿态和距离变化的精确雷达探测概率模型;其次,详细分析了HP伪谱法基本理论及其求解最优控制问题策略,利用HP伪谱法并结合对地近距作战实战背景,分别以时间最短、威胁代价最小和定时飞行为目标函数进行雷达规避轨迹规划仿真研究,得到了期望的攻击轨迹并对3条轨迹进行了深入对比分析;最后,对仿真结果进行了精度分析,分析计算表明仿真误差在允许范围内,再次验证了方法的可行性。     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.     

Electronic Structure of Semiconductor Nanocrystals

This paper reviews our recent development of the use of the large-scale pseudopotential method to calculate the electronic structure of semiconductor nanocrystals, such as quantum dots and wires, which often contain tens of thousands of atoms. The calculated size-dependent exciton energies and absorption spectra of quantum dots and wires are in good agreement with experiments. We show that the electronic structure of a nanocrystal can be tuned not only by its size,but also by its shape. Finally,we show that defect properties in quantum dots can be significantly different from those in bulk semiconductors.     

Critical Stage Rule-Based Real Time Dispatch（RTD）System in Highly-Mixed-Products （HMP） FAB

An improving utilization and efficiency of critical equipments in semiconductor wafer fabrication facilities are concerned. Semiconductor manufacturing FAB is one of the most complicated and cost sensitive environments. A good dispatching tool will make big difference in equipment utilization and FAB output as a whole. The equipment in this paper is In-Line DUV Scanner. There are many factors impacting utilization and output on this equipment group. In HMP environment one of the issues is changing of reticule in this area and idle counts due to load unbalance between equipments. Here we'll introduce a rule-based RTD system which aiming at decreasing the number of recipe change and idle counts among a group of scanner equipment in a high-mixed-products FAB.     

GaAsSb/InAlAs PA DHBTs Grown by Production MBE

The epi material growth of GaAsSb based DHBTs with InAlAs emitters are investigated using a 4 × 100mm multi-wafer production Riber 49 MBE reactor fully equipped with real-time in-situ sensors including an absorption band edge spectroscope and an optical-based flux monitor. The state-of-the-art hole mobilities are obtained from 100nm thick carbon-doped GaAsSb. A Sb composition variation of less than ± 0.1 atomic percent across a 4 × 100mm platen configuration has been achieved. The large area InAlAs/GaAsSb/InP DHBT device demonstrates excellent DC characteristics,such as BVCEO＞6V and a DC current gain of 45 at 1kA/cm2 for an emitter size of 50μm × 50μm. The devices have a 40nm thick GaAsSb base with p-doping of 4. 5 × 1019cm-3 . Devices with an emitter size of 4μm × 30μm have a current gain variation less than 2% across the fully processed 100mm wafer. ft and fmax are over 50GHz,with a power efficiency of 50% ,which are comparable to standard power GaAs HBT results. These results demonstrate the potential application of GaAsSb/InP DHBT for power amplifiers and the feasibility of multi-wafer MBE for mass production of GaAsSb-based HBTs.     

Influence of polarization extinction ratio on distributed polarization coupling detection

Distributed polarization coupling in polarization-maintaining fibers can be detected by using a white light Michelson interferometer. This technique usually requires that only one polarization mode is excited. However, in practical measurement, the injection polarization direction could not be exactly aligned to one of the principal axes of the PMF, so the influence of the polarization extinction ratio should be considered. Based on the polarization coupling theory, the influence of the incident polarization extinction on the measurement result is evaluated and analyzed, and a method for distributed polarization coupling detection is developed when both two orthogonal eigenmodes are excited.     

Noise character analysis and the restraint of self-pulsation laser diodes

We calculate the Langevin noise sources of self-pulsation laser diodes, analyze the effects of active region noise and saturable-absorption region noise on the power fluctuation as well as period fluctuation, and propose a novel method to restrain the noise effects. A visible SIMULINK model is established to simulate the system, The results indicate that the effects of noise in absorption region can be ignored; that with the increase of DC injecting current, the noise effects enhance power jitter, and nevertheless, the period jitter is decreased; and that with external sinusoidal current modulating the self-pulsation laser diode, the noise-induced power jitter and period jitter can be suppressed greatly. This work is valuable for clock recovery in all-optical network.     

High-quality single-crystal CdSe nanoribbons and their optical properties

Large-scale synthesis of single-crystal CdSe nanoribbons is achieved by a modified thermal evaporation method, in which two-step-thermal-evaporation is used to control CdSe sources＇ evaporation. The synthesized CdSe nanoribbons are usually several micrometers in width, 50 nm in thickness, and tens to several hundred micrometers in length. Studies have shown that high-quality CdSe nanoribbons with regular shapes can be obtained by this method. Room-temperature photolumines-cence indicates that the lasing emission at 710 nm has been observed under optical pumping （266 nm） at power densities of 25-153 kW/cm^2. The full width half maximum （FWHM） of the lasing mode is 0.67 nm     

Propagation of hermite-cosh-gaussian beams passing through ABCD optical system with an annular aperture

By using the expansion of the aperture function into a finte sum of complex Gaussian functions, the corresponding analytical expressions of Hermite-cosh-Gaussian beams passing through annular apertured paraxially and symmetrically optical systems written in terms of ABCD matrix were derived, and they could reduce to the cases with squared aperture. In a similar way, the corresponding analytical expressions of cosh-Gaussian beams through annular apertured ABCD matrix were also given. The method could save more calculation time than that by using the diffraction integral formula directly.     

中国建立EB级存储实验室,致力云计算应用(英文)

正With the support of 863 programs,Sugon Information Industry Co.,Ltd.,set up a dawning EB-class storage laboratory to address massive data storage requirements and largescale cloud computing demonstration applications.The Dawning EB-class cloud storage system adopts advanced fault-tolerant architecture,efficient data fault-tolerant algorithms with user authentication and data encryption policies to deal with the"lost""wrong"and"stolen"problems of data for ensuring the reliability and safety of the EB-class storage system in the public network application environments.The Dawning EB-class Storage Laboratory taking advan-