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An improved de-interleaving algorithm of radar pulses based on SOFM with self-adaptive network topology

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Journal of Systems Engineering and Electronics 2020年第4期31卷 712-721页

作者： JIANG Wen FU Xiongjun chang jiayun QIN Rui School of Information and Electronics Beijing Institute of TechnologyBeijing 100081China

As a core part of the electronic warfare(EW) system,de-interleaving is used to separate interleaved radar signals. As interleaved radar pulses become more complex and denser, intelligent classification of radar signals has become very important. The self-organizing feature map(SOFM) is an excellent artificial neural network, which has huge advantages in intelligent classification of complex data. However, the de-interleaving process based on SOFM is faced with the problems that the initialization of the map size relies on prior information and the network topology cannot be adaptively adjusted. In this paper, an SOFM with self-adaptive network topology(SANT-SOFM) algorithm is proposed to solve the above problems. The SANT-SOFM algorithm first proposes an adaptive proliferation algorithm to adjust the map size, so that the initialization of the map size is no longer dependent on prior information but is gradually adjusted with the input data. Then,structural optimization algorithms are proposed to gradually optimize the topology of the SOFM network in the iterative process,constructing an optimal SANT. Finally, the optimized SOFM network is used for de-interleaving radar signals. Simulation results show that SANT-SOFM could get excellent performance in complex EW environments and the probability of getting the optimal map size is over 95% in the absence of priori information.

关键词： de-interleaving self-organizing feature map(SOFM) self-adaptive network topology(SANT)

Wideband radar detector based on characteristic parameters of echoes

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Journal of Systems Engineering and Electronics 2019年第5期30卷 897-904页

作者： chang jiayun FU Xiongjun JIANG Wen XIE Min School of Information and Electronics Beijing Institute of Technology

The statistical characterization of radar range cells with the target signals is much more distinct than that of the range cells with noise-only ***,the quasi-optimal detection principle based on the characteristic parameters of echo signals is adopted to develop a detector of range-spread targets in Gaussian ***,the characteristic parameters of the return signals in the entire range profiles of radar are ***,the clustering analysis of the characteristic parameter matrix is discussed to extract the test statistic of ***,the probabilities of detection and false alarm of the proposed detector are *** analysis shows that the proposed detector does not need the prior knowledge about the spatial distribution of the target scattering centers in practical scenarios,and it is simple and robust even in low signal-to-noise ratio(low-SNR)*** Carlo(MC)simulations reveal that the detection performance of the proposed detector outperforms the conventional detectors.

关键词： wideband radar mathematical statistics characteristic parameter clustering analysis

Design of high-performance energy integrator detector for wideband radar

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Journal of Systems Engineering and Electronics 2019年第6期30卷 1110-1118页

作者： chang jiayun FU Xiongjun JIANG Wen XIE Min School of Information and Electronics Beijing Institute of Technology

Target detection for wideband radar has recently received extensive attention. The classical energy integrating(EI)detector will always accumulate excess clutter or noise energy,which leads to unacceptable performance deterioration if the detection window is not selected properly. In this paper, an EI detector for the distributed targets in the Gaussian environment is ***, at the stage of preparatory work, the target models are proposed, then, the problem formulation is introduced. Subsequently,in the aspect of optimizing the method of detection window search and the method of threshold setting, the detailed design stages of the proposed detector are provided. Furthermore, theoretical analyses show that the proposed detector is easy to hardware implementation, and it does not need the prior knowledge about the spatial distribution of the target scattering centers in practical radar detection application. Finally, the performance assessment conducted by Monte Carlo simulations verifies that the proposed detector outperforms the conventional detectors.

关键词： radar detection distributed target integration detec tor.

Micro-Doppler Parameter Estimation Method Based on Compressed Sensing

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Journal of Beijing Institute of Technology 2019年第2期28卷 286-295页

作者： jiayun chang Xiongjun Fu Wen Jiang Min Xie School of Information and Electronics Beijing Institute of Technology

A micro-Doppler parameter estimation method based on compressed sensing theory is proposed in this *** micro-Doppler parameter estimation algorithm was improved for micro-motion targets with translation in this *** ideal micro-Doppler parameter estimation results were *** proposed micro-Doppler parameter estimation was compared with the traditional micro-Doppler parameter estimation *** for return signal length were analyzed with this new algorithm and its performance was also analyzed in various environments with different SNR.

关键词： feature extraction compressed sensing micro-Doppler parameter estimation

A Measurement of the Contribution Made by Foreign Investment to Chinese Economy

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Chinese Business Review 2005年第10期4卷 21-24,33页

作者： Guojie Zhao Xiaogeng Wang jiayun chang Tianjin University Tianjin University of Commerce Boustead College

The author uses the statistics from 1981 to 2002 to perform a logarithmic regression analysis on the contribution made by foreign investment to Chinese economy. The measurement shows that the following effects on Chinese economy are brought by large amount of foreign investment： 1） Foreign investment, as an important investment source, boosts the increase of the stock of production factors and improves the supplying potentials of Chinese economy. 2） The application of foreign investment speeds the rapid growth of the total production value and the increases the value of Chinese industry. 3） Foreign investment changes the employment structure of Chinese labor force. 4） The tax in China, to some extent, owes its growth to the adoption of foreign investment.

关键词： foreign investment developmer of Chinese economy measurement of contribution logarithmic regression analysis

Knowledge Ferment ---Critical Path to Building Organizational Core Competence

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Chinese Business Review 2006年第2期5卷 79-81页

作者： jiayun chang Xiaogeng Wang Ruixue Zhu Tianjin University of Commerce Boustead College Tianjin University

Since Prahalad and Hamel put forward the definition of core competence, there has been a heated discussion among entrepreneurs and scholars on how to form the core competence of the enterprises. This paper starts by illustrating the model of knowledge ferment and then discusses the critical paths to building core competence in terms of organizational learning, formation of organizational competence, strategic alliance, expansion and application of competence.

关键词： knowledge ferment core competence critical path

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教育评价与决策模型

天津师范大学学报（自然科学版） 2010年第3期30卷 78-80页

作者：常家芸崔冉王雪涛天津商业大学宝德学院天津300384

运用多元统计分析和回归分析建立教育管理系统综合评价模型,指标间的权值由统计数据科学定量确定.

关键词：模型主成分分析回归分析权重 EMV

汽车文化APP界面设计研究——以红旗汽车文化APP界面设计为例

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工业设计 2022年第10期 64-66页

作者：唱佳韵孙明阳吉林建筑大学吉林长春130118

汽车产业的发展丰富了汽车文化的内涵,利用数字化APP的技术手段使汽车文化完成了从现实到虚拟空间的转化,为汽车文化的保护与传播方式的转变及创新带来了无限可能。文章首先对汽车APP界面设计的现状进行分析概述,其次阐述了汽车文化APP... 详细信息

汽车产业的发展丰富了汽车文化的内涵,利用数字化APP的技术手段使汽车文化完成了从现实到虚拟空间的转化,为汽车文化的保护与传播方式的转变及创新带来了无限可能。文章首先对汽车APP界面设计的现状进行分析概述,其次阐述了汽车文化APP界面设计的意义,最后梳理了汽车文化APP界面的设计流程,并以红旗汽车文化APP界面设计为例,以期为其他同类型汽车文化的传播提供有益的参考。

关键词：汽车文化 APP 界面设计

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低碳高速钢渗碳

天津大学学报 1996年第3期29卷 418-421页

作者：郭亚飞李忆莲常家芸天津大学机械工程系天津天津大学材料科学与工程系天津

比较了低碳高速钢浅层渗碳经常规热处理后（１１７０℃和１０５０℃）的组织、硬度和耐磨性，讨论了不均匀奥氏体渗碳的扩散特点．生产应用表明，浅层渗碳明显提高了热磨损为主要失效模式的热度锻的使用寿命．

关键词：低碳高速钢渗碳使用寿命高速钢