红外空空导弹抗干扰性能评估指标体系研究

评估红外空空导弹抗干扰能力强弱的传统指标较为单一,多是利用综合抗干扰概率进行判定。针对该问题,建立了包含导弹总体、制导系统、导引头3个层次的抗干扰性能评估指标体系,实现抗干扰性能评估指标的分解,提高了对制导系统和导引头抗干扰性能的评估能力,提升了利用导引头、制导系统评估结果对导弹总体抗干扰性能进行预估的能力。     

基于主成分分析方法的光电系统抗干扰性能评估研究

基于主成分分析法开发了一种评估红外系统抗干扰性能的综合评价方法。针对红外系统,构建了能够体现其抗干扰性能的指标体系,利用主成分分析法,对不同红外系统的抗干扰性能做出了客观的评价。通过计算不同红外系统的综合得分、主成分得分,实现了不同系统抗干扰性能的综合排名,进而能够为红外系统的抗干扰性能评估提供重要参考依据。     

红外制导空空导弹抗干扰性能试验及评估研究

给出了一种红外空空导弹抗干扰试验和评估方法,解决了红外空空导弹抗干扰性能难于定量评估的问题。该方法通过详细规划导弹的抗干扰试验,采用贝努利方法得到导弹在数字仿真、半实物仿真和靶场飞行试验中的抗干扰试验数据,运用多层贝叶斯估计方法,得到导弹抗干扰概率计算模型。算例计算表明,该方法较传统评估方法等具有更高的可信度。     

红外成像导引系统抗干扰性能评估研究

为解决红外成像导引系统抗干扰性能难于定量评估问题,给出了一种新的评估指标体系。首先通过详细分析红外光学系统、调制器、探测器、图像处理系统、陀螺伺服系统的性能参数,得到红外导引系统在抗干扰过程中的固有性能指标;然后规划了在不同仿真条件下的抗干扰仿真实验,得到抗干扰识别算法概率和各种干扰因素的数据;最后采用层次分析法建立了红外成像导引系统抗干扰性能计算模型,并用算例进行了计算,结果表明该指标体系具有一定的实用性。     

基于DMD的动态红外场景生成系统

动态红外场景生成系统是检测红外导引头探测、跟踪和抗干扰性能的重要手段。以某型空空导弹光电对抗平台为应用对象,基于红外场景实测数据,利用Visual C＋＋6.0和Vega API开发了交互式红外图像生成软件,实时生成不同地域各种环境下目标和背景的红外图像,模拟真实场景在红外导引头入瞳处红外辐射分布。根据红外图像视频信号...     

红外空空导弹抗干扰性能验证方法研究

抗干扰性能是衡量红外空空导弹作战效能高低的重要指标之一,如何有效地进行测试与验证是当前研究的重点。提出了一系列包括静态验证,虚拟样机仿真,半实物仿真以及实物试验等完整的验证方法,可以全面考核红外空空导弹的抗干扰性能,其试验效果真实、有效。     

基于性能评估的雷达抗干扰研究

客观定量地评估雷达抗干扰性能是系统评估雷达抗干扰能力的关键,也可以为优化雷达抗干扰措施提供参考.文中建立了适用于实时评估抗干扰性能的指标体系,采用层次分析法确定了各指标的权重,构建了一套评估系统并给出实时评估结果,实现了抗干扰性能评估与措施优化迭代.通过实例定量地评估了抗干扰性能,科学地优化了抗干扰措施,实现了抗干扰性...     

红外导弹抗干扰能力多维度评估方法

影响红外导弹抗干扰成败的因素错综复杂,因此红外导弹抗干扰能力评估一直是领域内公认的一个难题。根据红外导弹研制的经验,提炼总结出了一套系统的红外导弹抗干扰性能评估方法,可以从空域、时域、频域、能量域、信息域等5个维度对导弹的抗干扰性能进行评估,大幅增加了评估结果的置信度。通过弹道仿真计算,给出了典型算例不同维度的抗干扰性能曲线。从仿真结果看,该方法评估结果与实际导弹的抗干扰特性基本吻合。     

模糊层次法评估机载雷达抗干扰效能

为了评估机载雷达抗干扰效能,介绍了抗干扰性能特点,建立了抗干扰性能评估指标体系,利用层次分析法(AHP)计算了各品质因素的权重,用模糊数学理论建立了各指标因素的模糊隶属度函数,对机载雷达抗干扰效能进行了综合评估.该方法用精确的数学描述机载雷达系统抗干扰性能指标中的模糊性,为评判机载雷达抗干扰性能提供了一种新的方法.并对美军AN-APQ153和AN-APG69两种机载雷达抗干扰效能进行了模糊综合评估,实例分析结果表明该评估方法具有实用性,其评估方法可为机载雷达效能评估提供参考.     

卫星导航接收机抗干扰性能评估方法研究

卫星导航接收机的抗干扰是导航战研究的一项重要内容。合理的抗干扰性能评估方法是对接收机的抗干扰性能进行正确评估的基础,目前卫星导航接收机还没有建立统一的抗干扰性能评价方法。在吸取GPS系统抗干扰性能评估方法的合理性的基础上,提出一种在接收机输入端对抗干扰性能进行评估的方法,与传统的抗干扰性能评估方法相比,该方法更具有工程实际意义。     

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