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1.
本文研究了已知噪声自相关函数时,线性SISO系统ARMAX模型的大纯时滞的辨识问题及结构与参数辨识的偏差补偿算法。本算法使得能够在很小的样本数及极低的信噪比下得到系统的结构参数。  相似文献   
2.
对雷达的全极化欺骗干扰技术研究   总被引:1,自引:0,他引:1  
分析了3种针对单极化假目标的鉴别算法,针对单极化干扰的缺陷,提出并分析了一种干扰极化测量雷达的新技术——全极化干扰,介绍了全极化干扰技术的工作原理,并详细分析了全极化干扰机关键部件的设计。  相似文献   
3.
运用粒子滤波对目标位置进行跟踪时,测量数据的异常突变点、目标的机动转弯、粒子数量的制约和重要性密度函数的优劣都会导致估计误差较大的野值出现,这将严重影响雷达对目标的跟踪精度。现有的野值剔除方法在目标发生机动时,都存在误剔率较高的问题。针对这个问题,采用莱特准则与机动门限准则相结合的方法,提出了不确定观测点的概念,设计了一种适用于机动目标的抗野值粒子滤波算法。仿真结果表明,该方法能较好地检测和更新野值,降低跟踪误差,提高跟踪精度。  相似文献   
4.
Conventional studies on the consequences of sanctions tend to focus on the target society as a whole without specifying how foreign economic pressures might affect the well-being of vulnerable groups within target countries – the same groups who often disproportionately bear the burden of sanctions. This study explores the extent to which sanctions increase the likelihood of discriminatory government practices against one of the globally most vulnerable groups, ethnic groups. It is argued that sanctions contribute to the rise of official ethnic-based economic and political discrimination through contracting the economy and creating incentives for the target government to employ ethnic-based discriminatory policies. Using data on over 900 ethnic groups from 1950 to 2003, the results lend support for the theoretical claim that sanctions prompt the government to pursue ethnic-based discriminatory economic and political practices in multiethnic countries. The findings also indicate that multilateral sanctions are likely to be more harmful to the well-being of ethnic groups than sanctions levied by individual countries. Further, the negative effect of comprehensive sanctions appears to be greater than that of sanctions with moderate and limited impact on the target economy. The regime type of the target state, on the other hand, appears to have a significant role only in conditioning the hypothesized effect of sanctions on economic discrimination. Overall, this study’s focus on a vulnerable segment of the target society – ethnic groups – offers a greater understanding of the consequences of sanctions. It also provides additional insight as to how, in multiethnic countries, political elites might domestically respond to external pressures to retain power.  相似文献   
5.
基于动力学模型的有源假目标鉴别方法   总被引:3,自引:0,他引:3       下载免费PDF全文
针对导弹防御中可能出现的有源假目标欺骗干扰,从雷达数据处理的层次上进行了真假目标鉴别研究。利用自由段有源假目标与实体目标在动力学模型上的本质差异,提出了动力学模型匹配系数的概念,推导出理想条件下的动力学模型匹配系数的解析表达式。在弹道目标跟踪的基础上设计了有源假目标鉴别算法。结合中程弹道,进行了真假目标鉴别的计算机仿真实验。实验结果表明,所提算法能有效鉴别有源假目标。  相似文献   
6.
Gabor变换和K-means算法是最为常用的纹理分析方法。然而,采用Gabor变换得到的纹理特征向量具有较高的维数,影响算法的运行效率;K-means算法也易受初始类中心的影响而导致分类精度下降。因此,通过Relief算法对采用Gabor变换所提取的纹理特征进行选择,得到合适的纹理特征子集。进一步采用差分进化算法,对K-means算法的聚类中心进行优化从而提高纹理识别精度和效率。实验结果表明:提出的方法所需用到的纹理特征向量的维数相对于原始特征集有大幅降低,较之基本的K-means算法,纹理识别的精度也有较明显的提高。  相似文献   
7.
建立了一种增强性模糊推理方法,用来满足综合地震事件识别判据的需求。利用这种推理方法进行了地震事件模糊逻辑推理综合识别方法研究,给出了方法的框架。实例研究表明这种综合识别方法在核试验地震监测中有减少可疑事件数量的能力。  相似文献   
8.
In order to improve the infrared detection and discrimination ability of the smart munition to the dy-namic armor target under the complex background, the multi-line array infrared detection system is established based on the combination of the single unit infrared detector. The surface dimension features of ground armored targets are identified by size calculating solution algorithm. The signal response value and the value of size calculating are identified by the method of fuzzy recognition to make the fuzzy classification judgment for armored target. According to the characteristics of the target signal, a custom threshold de-noising function is proposed to solve the problem of signal preprocessing. The multi-line array infrared detection can complete the scanning detection in a large area in a short time with the characteristics of smart munition in the steady-state scanning stage. The method solves the disadvan-tages of wide scanning interval and low detection probability of single unit infrared detection. By reducing the scanning interval, the number of random rendezvous in the infrared feature area of the upper surface is increased, the accuracy of the size calculating is guaranteed. The experiments results show that in the fuzzy recognition method, the size calculating is introduced as the feature operator, which can improve the recognition ability of the ground armor target with different shape size.  相似文献   
9.
从战术导弹靶场试验风险因素存在的主要环节分析入手,建立了风险因素指标体系,结合靶场试验特点阐述了风险辨识、评估、处理的原则和方法,结合某型舰空导弹试验靶标保障的工程问题,对该靶标供靶风险进行了辨识,对风险发生的概率和后果严重性作出了评估,并在此基础上提出了解决问题的基本途径.  相似文献   
10.
这项工作是详细研究北京谱仪(BES)轻子识别的一部分。本文报告了π/μ、π/e分辨的Monte Carlo 结果。结果表明:在北京谱仪中π/μ分辨有两个有效的截断,即位置与方向。对于π/μ分辨也有两个有效的截断,即总电荷量沉积和二极矩。  相似文献   
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