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提出一种对机载合成孔径雷达的干扰技术,该技术要求不仅要进行距离向的瞄准式干扰,还要进行方位向的瞄准式干扰。通过方位向的瞄准,可使对机载SAR干扰所需的干扰功率大约下降5dB~6dB。文中研究了进行方位向瞄准式干扰的可行性,分析了工程误差对实现方位向瞄准式干扰的影响,提出了相应的减小误差影响的措施,最后还给出了干扰系统的组成和工作流程。 相似文献
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一种雷达干扰技术—灵巧噪声干扰 总被引:12,自引:0,他引:12
由于脉冲多普勒(PD)雷达采用超低副瓣天线,或者使用相干旁瓣对消器或匿影器等技术,旁瓣干扰会变得极为困难,使得传统的噪声干扰或欺骗干扰的效能大大降低,介绍了一种兼有噪声干扰和欺骗干扰特点的灵巧噪声干扰技术,给出一种该干扰机的组成原理框图,简述了其工作原理并分析了其干扰效能。 相似文献
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干扰识别是通信电子防御系统的重要组成部分,针对复杂电磁环境的干扰识别问题,本文研究了联合多维特征的干扰识别技术,从时域、频域和变换域提取了一组对干扰参数、噪声敏感度低且复杂度较低的特征参数,给出了联合多维特征且基于决策树和支持向量机(Support Vector Machine,SVM)的两种干扰识别器结构,并进行了干扰识别性能仿真对比分析。仿真结果表明,这两种识别器对典型电磁干扰均具有良好的识别性能,对于瞄准式干扰、部分频带噪声干扰、噪声调频干扰和脉冲干扰,二者识别性能很接近;对于梳状多音干扰和线性调频干扰,SVM识别器比决策树识别器具有更好的识别性能。 相似文献
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介绍了干扰抵消技术的在多码CDMA系统中的应用背景,工作原理。简述了干扰抵消技术不同的应用形式,如硬干扰抵消、软干扰抵消、联合干扰抵消和部分干扰抵消,并分析了这几种方案各自的优缺点和实现复杂度。最后,展望了干扰抵消技术在未来通信系统中的应用前景。 相似文献
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通过对FLEX寻呼接收受干扰的描述,简要介绍了FLEX寻呼机同步方式,发信机、收信机互调干扰产生的原理,并依据理论指导,圆满解决了发信机互调干扰。说明只要仔细观察干扰现象,全面掌握无线干扰的产生理论,并在理论的指导下,便可摸索出解决无线干扰的可行方法。 相似文献
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分析了美国天基激光干扰的发展思路,针对各类传感器可能的干扰途径,建立了相应的天基激光干扰技术体系,提供了天基激光干扰技术必须解决的关键技术及其可行性的思路和方法,列举了近期可能应用于天基激光干扰的激光器技术。 相似文献
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The article describes a model representation of radar probing data in form of a mixture of background and target samples, which is the sum of two random variables with very different parameters. For model development we research the behavior of the central moments of the distribution mix without assuming the distribution law form. An example it is described the detection of the signal at the output of compression system of chirp ionosonde. 相似文献
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解决IP网QoS问题是目前通信领域的研究热点之一.虽然研究已经取得了一定的进展,但人们对于IP 网QoS本身的含义及相关的问题还有着不同的理解.本文将从IP网QoS的定义入手讨论相关的一些问题以及解决IP网QoS问题所做的各种努力. 相似文献
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《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1968,56(6):1024-1032
Assuming that visual responses are due to the action of particles on the membrane of the visual cells, the stochastic variability of the response should be a function of the number of particles producing it. Quantitative predictions can be made with the aid of a model proposed in previous articles. It is found that responses produced in visual cells of Limulus by absorption of a single photon have the stochastic properties which would be expected if the response to one photon were brought about by 25 particles. It is concluded from this that the processes leading to visual responses produce multiplication of particles. The effects of temperature and of metabolic poisons suggest that these processes are of chemical nature. 相似文献
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By means of exact conformal mapping method we have defined character of dependence of squares amounts of angular part of film
element on angled part dimension. We propose relations, approximating obtained dependence. Calculation results and experimental
researches of large-scale models are represented. 相似文献
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Moshrefzadeh R.S. Radcliffe M.D. Lee T.C. Mohapatra S.K. 《Lightwave Technology, Journal of》1992,10(4):420-425
The temperature dependence of refractive index of polymer films was determined for a number of slab waveguides by a grating coupling method. This dependence was examined as a function of parameters such as molecular weight and glass transition temperature of the polymer. Temperature-induced changes in N TE-N TM , N being the effective index, were studied systematically for different slab waveguide compositions. It is shown that with proper device design and choice of polymeric materials, thermal effects can be reduced 相似文献
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A. M. Emel’yanov 《Semiconductors》2010,44(9):1134-1139
A method for analyzing the luminescence spectra of semiconductors is suggested. The method is based on differentiation of
the spectra. The potentialities of the method are demonstrated for luminescence in the region of the fundamental absorption
edge of Si and SiGe alloy single crystals. The method is superior in accuracy to previously known luminescence methods of
determining the band gap of indirect-gap semiconductors and practically insensitive to different conditions of outputting
radiation from the sample. 相似文献
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“计算机组成原理”设计性实践教学模式研究 总被引:1,自引:0,他引:1
本文阐述了"计算机组成原理"设计性实验教学的重要性,对设计性实验教学的目的和基本特征进行了归纳,对"计算机组成原理"设计性实验教学的现状进行了调查,对存在的问题进行了较深入的分析;在此基础上.对组成原理设计性实验的教学模式进行了研究,对设计性实验的体系进行了初步设计,并对"计算机组成原理"设计性实验的实施方法进行了探讨. 相似文献