主动雷达/红外成像复合导引头技术浅谈

介绍了主动雷达/红外成像复合导引头的特点,分析了复合导引头的主要复合方式,对主动雷达,红外成像复合导引头的关键技术进行了初步的探讨.     

主动雷达导引头干扰效能评估指标体系的构建与约简

针对现有空空主动雷达导引头干扰效能评估指标体系的主观性较强,存在冗余现象,缺乏合理的建立依据和约简方法,文中分析了评估指标体系的构建原则,通过对导引头固有抗干扰能力和工作过程的分析,建立了评估指标体系。为解决多指标及各指标重要程度不一的问题,应用粗糙集属性约简算法对该指标集进行约简,删除了冗余属性,得到了核心属 性。并且以五组主动雷达导引头干扰效能评估指标数据为例进行算法模型验证,并对约简后的指标体系进行了有效性检验。实验结果表明:该方法能有效简化评估指标,得到工作体制抗干扰因子和自卫距离这两个核心指标,为主动雷达导引头干扰效能的评估提供理论支撑。     

复合导引头制导技术研究

现代战争的战场环境日趋复杂,单一制导模式容易受到有效干扰,而复合导引头则可利用各种制导模式的优点,互补不足。根据红外成像传感器、主动毫米波雷达和被动雷达的技术特点,分析了红外成像/主动毫米波雷达复合导引头、红外成像/被动微波复合导引头的工作流程。为了提高复合导引头的抗干扰能力,结合反舰导弹的实际工作流程,远距离时利用毫米波雷达或被动雷达进行探测,近距离时利用红外目标特征来区分干扰和舰船目标,从而形成适用于反舰导弹红外成像/主动毫米波雷达复合导引头和红外成像/被动微波复合导引头的末制导策略。     

反舰导弹主被动雷达复合导引头抗干扰性能评估研究

介绍了目前评估雷达导引头抗干扰性能的常见评估方案和评估准则,针对反舰导弹主被动复合雷达导引头在作战中面临的主要电子干扰,在导引头不同工作阶段分别分析其抗干扰特点,提出了相应的抗干扰性能指标,通过测量其在典型干扰背景下的某些特征参量来评价其抗干扰性能的方案。     

红外成像/毫米波雷达复合导引头制导策略研究

分析红外成像传感器和毫米波雷达的技术特点,介绍了红外成像/毫米波复合导引头的工作流程,为提高复合导引头抗干扰能力,提出利用红外目标特征来区分红外干扰和舰船目标,并结合反舰导弹工作的实际情况,形成一种适用于反舰红外成像/毫米波雷达复合导引头的末制导策略。     

基于层次分析法的雷达导引头抗干扰评估方法

抗干扰性能评估是雷达导引头作战效能评估的一个重要环节,是检验雷达导引系统抗干扰能力的主要手段,长期以来,对雷达导引头抗干扰效果评估方法的研究始终是一个不确定的技术难题.本文通过分析目前雷达导引头抗干扰评估的准则和方法,介绍了模糊综合评估模型和一种改进的层次分析法的原理.     

红外成像/毫米波雷达复合导引头信息融合研究

分析了红外成像/毫米波复合导引头的技术特点和工作状态,介绍一种红外成像传感器目标偏差角计算方法,针对红外成像/毫米波雷达复合导引头中平面毫米波雷达无法提供目标俯仰角信息这一特点,提出一种利用弹载测高仪提供的飞行高度推算出平面雷达俯仰角,并利用最优加权平均法对红外和雷达提供的信息进行融合,取得了较好的融合效果。     

基于物元模型的被动雷达导引头抗干扰性能评估

针对被动雷达导引头抗干扰评估指标多、难以综合评定的问题,提出了基于物元模型的被动雷达导引头抗干扰综合评估方法.该方法以物元模型的可拓集合和关联函数理论为基础,确定了抗干扰性能的等级范围,将待评的抗干扰性能指标代入各等级的集合进行关联度的计算,按照关联度的大小确定相应的抗干扰性能等级.结合多种被动雷达导引头的指标参数,进行了算例分析,结果表明,该方法能够实现对被动雷达导引头的抗干扰性能综合评估.该方法的提出对于其他体制导引头抗干扰性能综合评估也具有借鉴意义.     

雷达/红外复合导引头信息融合算法

毫米波雷达/ 红外成像复合制导已成为当前多模复合制导技术的研究热点。从毫米波雷达/ 红外成像复合导引头系统的特点及其工程应用出发,建立了一种基于联邦滤波(FF)的分布式雷达/ 红外复合导引头信息融合算法。首先,针对扩展卡尔曼滤波存在线性化误差以及雷达测量噪声非高斯的特点,采用粒子滤波算法(PF)设计雷达子滤波器;针对红外传感器不能测量目标距离的特点,采用伪线性卡尔曼滤波算法(PLKF)设计红外子滤波器。然后通过主滤波器进行信息融合,并对两个子滤波器进行信息分配和重置。仿真结果表明,该信息融合算法能够有效地提高雷达/红外复合导引头系统的目标跟踪精度及系统的稳定性。     

导引头目标干扰识别与抗干扰

为提高空战中复杂干扰环境下导弹的作战效能,提出一种新的导引头对目标干扰进行识别及抗干扰的方法一基于目标行为模式识别的抗干扰方法,并给出了导引头抗干扰技术方案。最后,分别仿真验证了该方法应用于雷达导引头和红外导引头抗干扰的有效性。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks