检索结果-南通市图书馆

Parameter Estimation of Multiple Mono-Pulse Radar Signals Intercepted by Nyquist Folding Receiver Using Periodic Chirp Local Oscillator Based on Periodic Fractional Autocorrelation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2022年第1期31卷 181-189页

作者： QIU Zhaoyang li tingpeng WANG Yiming State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System (CEMEE) School of Communication Engineering Hangzhou Dianzi University School of Rail Transportation Soochow University

The frequency space of modern radar system has been extended to a wide range. To intercept the modern radar signals with high interception probability, the wideband receiving is of significance to the radar reconnaissance receiver. The Nyquist folding receiver(NYFR) is a novel ultra-wideband receiving architecture,which requires a small amount of equipment. Because the mono-pulse radar signal is widely used in radar systems,the multiple mono-pulse radar signals will be intercepted by the NYFR. The parameter estimation of multiple simultaneous arrival mono-pulse radar signals intercepted by the NYFR using periodic chirp local oscillator is considered. The definition of periodic fractional autocorrelation(PFA) is proposed. Based on the PFA, a novel fast parameter estimation method is given. The proposed estimation approach can estimate the multiple NYFR outputs under frequency aliasing condition and has low computational complexity. Simulation results show the effectiveness of the proposed method.

关键词： modern radar signals computational complexity modern radar system probability Nyquist folding receiver multiple NYFR ultra wideband communication novel fast parameter estimation method radar systems multiple mono-pulse radar signals radio receivers periodic chirp local oscillator periodic fractional autocorrelation high interception probability novel ultra-wideband receiving architecture radar signal processing signal detection radar receivers radar reconnaissance receiver parameter estimation receivers mono-pulse radar signal multiple simultaneous arrival mono-pulse radar signals

Optimizing reliability, maintainability and testability parameters of equipment based on GSPN

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2015年第3期26卷 633-643页

作者： tingpeng li Yue li Yanling Qian Yongcheng Xu Science and Technology on Integrated Logistics Support Laboratory National University of Defense Technology

Reliability, maintainability and testability （RMT） are important properties of equipment, since they have important influ- ence on operational availability and life cycle costs （LCC）. There- fore, weighting and optimizing the three properties are of great significance. A new approach for optimization of RMT parameters is proposed. First of all, the model for the equipment operation pro- cess is established based on the generalized stochastic Petri nets （GSPN） theory. Then, by solving the GSPN model, the quantitative relationship between operational availability and RMT parameters is obtained. Afterwards, taking history data of similar equipment and operation process into consideration, a cost model of design, manufacture and maintenance is developed. Based on operational availability, the cost model and parameters ranges, an optimization model of RMT parameters is built. Finally, the effectiveness and practicability of this approach are validated through an example.

关键词： reliability maintainability testability optimization cost model operational availability.

Real-time ray-based channel generation and emulation for UAV communications

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2022年第9期35卷 106-116页

作者： Yang YANG tingpeng li Xiaomin CHEN Manxi WANG Qiuming ZHU Ruirui FENG Fuqiao DUAN Taotao ZHANG State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System(CEMEE) Luoyang 471003China College of Electronic and Information Engineering Nanjing University of Aeronautics and AstronauticsNanjing 211106China

A real-time ray-based hardware emulator for Unmanned Aerial Vehicle(UAV) communication channels which suits for the Three-Dimensional(3D) dynamic scenarios and considers the movements of both terminals is developed in this paper. The time-variant channel parameters, i.e.,ray delay, ray gain, and ray Doppler frequency are precalculated in the host by using the Ray Tracing(RT) method. Meanwhile, RT simulation dramatically increases the number of valid rays. To address the problem of resource limitation and huge computational burden in the implementation,an efficient ray coefficients generation method based on iteration is proposed and *** the advantages of low cost and high flexibility, a Software Defined Radio(SDR) hardware platform is used to emulate the ray-based UAV channels by utilizing the compact architecture including the Time-Division(TD) scheme and Tapped-Delay line(TDL) for channel ***, hardware measurement results demonstrate that the properties of emulated channel, i.e.,Power Delay Profile(PDP) and Doppler Power Spectrum Density(DPSD) consist with the simulated ones, which verifies the correctness of hardware implementation. The proposed channel emulator provides an efficient way for optimization, verification, and evaluation of UAV communication systems.

关键词： Unmanned aerial vehicle Channel model Ray-based channel emulation Ray tracing Software defined radio Ray coefficient

Anti-Jamming Null Space Projection Beamforming Based on Symbiotic Radio

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2024年第1期138卷 679-689页

作者： Baofeng Ji Yifan liu tingpeng li ling Xing Weixing Wang Shahid Mumtaz Xiaolong Shang Wanying liu Congzheng Han State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System(CEMEE) Luoyang471000China Research and Innovation Center of Intelligent System Longmen LaboratoryLuoyang471000China College of Information Engineering Henan University of Science and TechnologyLuoyang471000China Institute of Atmospheric Physics Chinese Academy of Sciences(LAGEO)Beijing100000China Instituto de Telecomunicaes Aveiro3800-005Portugal Chinese Academy of Agricultural Mechanization Sciences Beijing100000China

With the development of information technology,more and more devices are connected to the Internet through wireless communication to complete data *** to the broadcast characteristics ofwireless channels,wireless networks have suffered more and more malicious *** layer security has received extensive attention from industry and *** is considered to be one of the most important technologies related to physical layer *** beamforming technology,messages can be transmitted to legitimate users in an offset direction that is as orthogonal as possible to the interference channel to ensure the reception SINR by legitimate *** the symbiotic radio(SR)technology,this paper considers a symbiotic radio antijamming MIMO system equipped with a multi-antenna system at the main base *** order to avoid the interference signal and improve the SINR of the signal received by the *** base station is equipped with a uniform rectangular antenna array,and using Null Space Projection(NSP)Beamforming,Intelligent Reflecting Surface(IRS)can assist in changing the beam’s *** simulation results show that NSP Beamforming could make a better use of the null space of interference,which can effectively improve the received SINR of users under directional interference,and improve the utilization efficiency of signal energy.

关键词： Symbiotic radio anti-jamming MIMO NSP Beamforming physical layer security

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于改进匈牙利算法的多技能人员调度方法

国防科技大学学报 2016年第2期38卷 144-149页

作者：李廷鹏钱彦岭李岳国防科技大学装备综合保障技术重点实验室湖南长沙410073

人员的优化配置对于提高装备制造效率具有重要意义。针对经典匈牙利算法不能解决具有并联环节的人员指派问题的不足,提出利用虚拟工作代替并联环节,将问题转化为典型的指派问题;通过判断虚拟工作的可实现性,迭代搜索得到最优解。以某多... 详细信息

人员的优化配置对于提高装备制造效率具有重要意义。针对经典匈牙利算法不能解决具有并联环节的人员指派问题的不足,提出利用虚拟工作代替并联环节,将问题转化为典型的指派问题;通过判断虚拟工作的可实现性,迭代搜索得到最优解。以某多技能人员任务指派系统为例,详细介绍了该优化方法的步骤。优化结果很好地验证了改进算法的有效性。

关键词：匈牙利算法装备制造资源调度虚拟工作多技能

在线全文

学校读者我要写书评

暂无评论

胚胎型在线自修复FIR滤波器研究

仪器仪表学报 2012年第6期33卷 1385-1391页

作者：王南天钱彦岭李岳卓清琪李廷鹏国防科学技术大学装备综合保障技术重点实验室长沙410073

胚胎电子阵列是受多细胞生物体自修复机制启发,具有在线自修复能力的新型电路。在介绍胚胎电子阵列基本原理的基础上,根据FIR(finite impulse response)滤波器的结构特征,提出一种适用于FIR滤波器的胚胎电子阵列细胞结构,并基于该细胞... 详细信息

胚胎电子阵列是受多细胞生物体自修复机制启发,具有在线自修复能力的新型电路。在介绍胚胎电子阵列基本原理的基础上,根据FIR(finite impulse response)滤波器的结构特征,提出一种适用于FIR滤波器的胚胎电子阵列细胞结构,并基于该细胞结构设计了具有快速在线自修复能力的胚胎型FIR滤波器。最后通过实例验证了其滤波功能与在线自修复能力。

关键词：胚胎型仿生 FIR滤波器在线自修复

基于LS-DYNA的圆弧诱导槽梯度薄壁管吸能分析

在线全文

学校读者我要写书评

暂无评论

北京汽车 2022年第4期 8-12页

作者：李廷朋桂林航天工业学院汽车工程学院广西桂林541004

梯度薄壁管作为一种新型吸能元件,相比普通薄壁管具有更优越的碰撞吸能特性。为了进一步提升梯度薄壁管吸能特性,提出具有圆弧诱导槽的梯度薄壁管。分析圆弧槽半径大小,梯度薄壁管厚度,梯度薄壁管不同材料以及碰撞角度对圆弧诱导槽梯度... 详细信息

梯度薄壁管作为一种新型吸能元件,相比普通薄壁管具有更优越的碰撞吸能特性。为了进一步提升梯度薄壁管吸能特性,提出具有圆弧诱导槽的梯度薄壁管。分析圆弧槽半径大小,梯度薄壁管厚度,梯度薄壁管不同材料以及碰撞角度对圆弧诱导槽梯度薄壁管的吸能特性的影响。对圆弧诱导槽梯度薄壁管进行轴向和斜向碰撞仿真研究,以初始峰值力和比吸能作为研究指标,仿真结果表明具有圆弧诱导槽的梯度薄壁管能够进一步降低碰撞初始峰值力,同时比吸能有所提升。

关键词：梯度薄壁管圆弧诱导槽初始峰值力比吸能

基于人机结合的雷达电磁环境效应机理分析方法

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

现代雷达 2022年第10期44卷 89-93页

作者：李廷鹏汪连栋王满喜彭丹华电子信息系统复杂电磁环境效应国家重点实验室河南洛阳471003

随着用频装备数量的增加,战场电磁环境变得越来越复杂,雷达系统电磁环境适应能力已经成为影响其作战效能的重要因素,为理清电磁环境对雷达系统产生影响的内在机理,亟需开展效应机理分析研究。以试验数据为基础,结合领域专家知识研究效... 详细信息

随着用频装备数量的增加,战场电磁环境变得越来越复杂,雷达系统电磁环境适应能力已经成为影响其作战效能的重要因素,为理清电磁环境对雷达系统产生影响的内在机理,亟需开展效应机理分析研究。以试验数据为基础,结合领域专家知识研究效应表征特征集,借助贝叶斯网络等机器学习算法,提出基于人机结合的雷达电磁环境效应机理分析方法并进行了验证。

关键词：电磁环境效应效应机理机器学习贝叶斯网络雷达系统

新工科背景下新能源汽车方向建设与人才培养研究

在线全文

学校读者我要写书评

暂无评论

科教文汇 2022年第17期 84-86页

作者：李廷朋王曙道桂林航天工业学院汽车工程学院广西桂林541004

在新工科背景下,新能源汽车作为新兴产业,如何做好新能源汽车方向建设与人才培养也引起许多院校的关注。该文首先介绍了新能源汽车的分类以及相关政策的引导。其次,从新能源汽车与传统汽车的区别方面阐述了新能源汽车方向建设的必要性... 详细信息

在新工科背景下,新能源汽车作为新兴产业,如何做好新能源汽车方向建设与人才培养也引起许多院校的关注。该文首先介绍了新能源汽车的分类以及相关政策的引导。其次,从新能源汽车与传统汽车的区别方面阐述了新能源汽车方向建设的必要性。最后,从人才培养目标、师资队伍建设、校企合作三个方面论述了人才培养的相关对策。

关键词：新工科新能源汽车方向建设人才培养