共查询到18条相似文献,搜索用时 442 毫秒
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战场电磁环境是战场中的一个重要因素,其复杂度对作战指挥人员的作战决策和作战运用具有重要的参考意义。本文以战场电磁环境复杂度在作战指挥中的应用为研究背景,在分析作战指挥对战场电磁环境复杂度的作战需求的基础上,研究建立了适合不同作战指挥层次应用的分层分类的战场电磁环境复杂度的评估方法,并给出了电磁环境复杂度评估指标和相应的表征方法。 相似文献
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电磁环境复杂度评估方法是研究电磁环境影响机理和构建试验电磁环境的关键环节,针对这一问题,提出了一种通信侦察装备电磁环境复杂性定量评估方法.通过分析不同电磁环境信号对通信侦察装备影响,提出了利用电磁环境不确定复杂度、相似性复杂度和占有复杂度的通信侦察电磁环境复杂性度量方法,给出了不确定复杂度、相似复杂度和占有复杂度的计算方法.实验结果表明,方法可以有效的评估通信侦察能力试验中所构设电磁环境的复杂度,为电磁环境构建和电磁环境复杂度评估研究提供参考. 相似文献
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针对复杂电磁环境电磁干扰复杂度定性与定量评估问题,该文提出一种基于快速S变换时频空间模型的复杂度评估方法。利用快速S变换方法同步提取时域占用度、频域占用度和能量占用度等评估指标,给出了具体计算方法。在此基础上建立快速S变换时频空间评估模型,将时域、频域和能量域3维向量的F范数和均方根作为电磁环境主观复杂度和客观复杂度评估指标,克服了传统电磁干扰复杂度评估独立参数定级不能全面反映电磁干扰整体特性的局限性。仿真结果表明,采用该模型能有效同步提取时频及能量评估特征参数,时频空间评估模型能精确反映整体电磁干扰特征;实验测试结果验证了本文所提评估方法的正确性。 相似文献
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针对复杂电磁环境难以评定,尤其是电磁环境与电子信息系统相互影响、紧密耦合情况下复杂电磁环境难以度量的问题,提出了一种从复杂电磁环境复杂度、威胁度两个层面对复杂电磁环境进行度量评估的方法。在构建复杂电磁环境“四域”(时、空、频、能域)评价指标基础上,建立了基于“四域”特征占有度指标的电磁环境复杂度评估以及基于“四域”特征相关性指标的电磁环境威胁度评估方法,并给出了相应的仿真评估算例。仿真结果表明了评估方法的可行性,可为复杂电磁环境评估和模拟等相关问题提供方法和依据。 相似文献
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战场电磁环境复杂度定量评估方法研讨 总被引:6,自引:0,他引:6
战场电磁环境复杂度的评估,是研究战场电磁环境的最重要、最感兴趣的目标之一。为定量评估战场上电子对抗装备面临的电磁环境状况,构建了复杂度定量评估模型。首先提出了评估指标体系,建立了指标评估模型,再利用模糊层次分析法确定了指标的权重,根据电子对抗装备受电磁环境影响的程度情况,给出了电磁环境复杂度等级的四类划分标准,最后总结给出复杂度评估计算模型。通过实例对模型进行了计算验证。验证结果表明,所建评估模型能够定量反映出战场电磁环境的复杂状况,结果合理,符合实际,具有一定的军事应用价值。 相似文献
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战场电磁信号环境最复杂原理预测 总被引:1,自引:0,他引:1
战场电磁环境分布状态预测是有针对性地构建电子对抗训练复杂电磁环境的前提。目前的战场电磁环境分析方法不能对电磁环境分布状态进行解析预测,使得电磁环境的构建、控制和评估缺少理论依据和具体指标,针对这一问题,将熵的概念应用于战场电磁环境频谱分布预测。介绍了基于熵的战场电磁环境复杂度研究现状,组成论对战场电磁信号环境的组成、复杂性进行了分析,给出了战场电磁信号环境时间、空间、频谱占有差异的复杂程度计算公式,以战场电磁兼容为约束条件,使用最复杂原理,预测了战场电磁信号环境的频谱宽度的分布函数,最后,进行了仿真计算,仿真结果与理论预测吻合。 相似文献
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Ta‐Te Lu Sheng‐Cheng Yeh Shang‐Hung Wu 《International Journal of Communication Systems》2016,29(5):874-892
Compared with other indoor positioning methods, pattern matching offers greater accuracy. However, its construction requires additional time and manpower cost, and larger positioning environments result in correspondingly greater construction costs and computing complexity. To reduce the cost and computing complexity of pattern construction, plane models featuring radio signals were adopted in conjunction with quick response codes to facilitate the simple and rapid construction of indoor environments in this study. The advantages of using plane equations instead of pattern matching radio maps for positioning computations include the following: (1) reducing the complexity of positioning computations; (2) eliminating the influences of positioning area size; and (3) providing reliable and accurate positioning with an average error of approximately 2.8 m. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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Estevan P. Seraco José Gabriel R.C. Gomes 《Signal processing》2011,91(5):1134-1142
Several methods for evaluation of the complexity of data compression systems and for including complexity measures in the traditional rate-distortion analysis have been published in recent works. In this work, we indicate that the relationship between rate-distortion performance and complexity for some practical coding schemes—entropy-constrained vector quantization (ECVQ) and interpolative vector quantization (IVQ)—can be represented by affine models. For the same rate-distortion performance, the complexity of an interpolative vector quantizer is known to be significantly smaller than the complexity of a full-search entropy constrained vector quantizer, and this complexity difference is a suitable illustration for the rate-distortion-complexity framework. We use high-resolution theory arguments to derive the affine models for ECVQ and IVQ. The proposed affine complexity modeling successfully predicts the cost of vector quantizers designed from data sets that were not used to generate the models. 相似文献
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One would like to compare and analyze digital communication systems based upon their overall probability of error. Unfortunately, easily evaluated closed form expressions for these probabilities are almost impossible to derive due to the complexity of the stochastic systems usually encountered. Hence, one must often resort to simulation to obtain the desired quantities. The most obvious technique is Monte Carlo simulation, which directly counts the number of errors in repeated trials. The problem is that error probabilities are usually quite small, requiring numerous simulation runs to sufficiently “hit” the rare event to gain adequate knowledge of its statistics. This places severe demands on the computer's random number generator. Importance sampling strategies simulate under altered input signal distributions (e.g., translation or stretching) so as to “speedup” convergence of the error estimators. The authors discuss a speedup technique termed quick simulation based upon results in large deviation theory. The quick simulation method is shown to compare favorably with three other importance sampling techniques for simulating a simple nonlinear system with memory 相似文献
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对于重复率较高的任意类型大量数据的排序,文中提出了一种新算法。该算法具有快速排序算法的简洁性,又避开了递归算法,时间复杂度为O(n),空间复杂度为O(1)。理论分析和实验表明,该算法的性能明显优于其它排序算法,适合于数据量较大的场合。 相似文献
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可计算的图像复杂度评价是让计算机模拟人类视觉感知,从而对图像视觉复杂度进行决策的研究,该研究属于多学科交叉的创新性研究课题,在图像工程领域具有重要意义.本文针对可计算的图像复杂度评价方法进行了全面的梳理和分析,文中首先回顾了图像复杂度的应用领域,并详细阐述了图像复杂度评价方法,从信息论、图像压缩理论、图像特征分析、眼动数据等方面进行总结;随后,着重阐述基于图像特征的图像复杂度评价方法中所使用的图像特征;归纳图像复杂度建模中的分类和回归问题;最后,总结当前图像视觉复杂度评价方法存在的问题和挑战,展望图像复杂度的计算化发展方向. 相似文献