检索结果-内蒙古大学图书馆

8th International Conference on Signal and Image Processing, ICSIP 2023

作者： Wu, Hanjie Yao, Huiwei Cheng, Yongqiang Zou, Runming National University of Defense Technology College of Electronic Science and Technology Changsha China State Key Lab. of Complex Electromagnetic Environment Effects on Electronics and Information System Luoyang China

ISBN: (纸本)9798350397932

Inverse synthetic aperture radar (ISAR) images that characterize the complete scattering characteristics of enemy aircraft are difficult to be obtained due to the attitude sensitivity of aircraft targets. An interpolation method based on the principal component analysis (PCA) is proposed to achieve the interpolation of ISAR images in this paper. First, an ISAR image pre-processing method is proposed to reduce the effect of ISAR image rotation characteristics. Then, the principle of PCA is analyzed and a 'pairwise' principle is proposed based on the analysis of the image features corresponding to the eigenvalues of ISAR images to inverse ISAR images. Finally, a spherical manifold that characterizes ISAR images with different attitudes is established, while interpolation of ISAR images is achieved by interpolation of geodesic lines on the spherical manifold. Furthermore, compared with the image pixel point interpolation, the deep learning method, and the proposed method in this paper, simulation results indicate that the proposed method is promising. © 2023 IEEE.

关键词： Principal component analysis

来源：评论

学校读者我要写书评

暂无评论

A Self-Biased 210-260 GHz Frequency Tripler Based on Planar Schottky Diodes 9

A Self-Biased 210-260 GHz Frequency Tripler Based on Planar ...

引用

9th IEEE MTT-S International Wireless Symposium, IWS 2022

作者： Wang, Li Zhang, Yong Wei, Haomiao University of Electronic Science and Technology of China Defense Key Laboratory of Ehf Complex System Chengdu611731 China

ISBN: (数字)9781665481977

ISBN: (纸本)9781665481977

This paper describes the design and demonstration of a hybrid integrated 210260 GHz self-biased frequency tripler based on planar Schottky diodes. Two Schottky diodes are placed in reversed parallel on the circuit. Then, a self-bias resistor is connected to the circuit to provide a DC bias. The bias voltage is changed by adjusting the resistances, so that the tripler can fit in the best working state. In addition, the current saturation effect is considered in the nonlinear simulation of the circuit to obtain more accurate simulated results. The proposed tripler was fabricated on a 50-um thickness quartz substrate circuit and housed in split waveguide blocks. Measured results show that the tripler exhibits a peak output power of 6.4 dBm at 220 GHz with 20 dBm pumped power and a wide 3 dB bandwidth of 21 % from 210 GHz to 260 GHz with a conversion efficiency above 2.2%. © 2022 IEEE.

关键词： Schottky barrier diodes

来源：评论

学校读者我要写书评

暂无评论

Length Estimation of Ships through Dual-radar Collaborative Observation

Length Estimation of Ships through Dual-radar Collaborative ...

引用

IET International Radar Conference 2023, IRC 2023

作者： Hu, Yihang Ai, Xiaofeng Wang, Manxi Zheng, Yuqing College of Electronic Science and Technology National University of Defense Technology Changsha410073 China State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System Luoyang471003 China

ISBN: (数字)9781837240982

ISBN: (纸本)9781839539954

The length of ships plays an important role in target classification and recognition, but to estimate ships' length in real time is difficult by traditional single radar observation. To solve this problem, the dual-radar collaborative observation method is proposed in this study to jointly calculate the ship length, by using the obtained HRRP (High Range Resolution Profile). The effect of SNR (signal-to-noise ratio) on estimation error of system parameters and the ship length estimated is simulated. The results show that the method can estimate the ship length effectively, the estimation error of the ship length is not more than one meter under high SNR (more than 10dB), which provides a reference for feature extraction and target recognition of ships. © The Institution of Engineering & technology 2023.

关键词： Radar target recognition

来源：评论

学校读者我要写书评

暂无评论

The Synthetic Aperture Radar-based Image Augmentation Using Generative Adversarial Network 23

The Synthetic Aperture Radar-based Image Augmentation Using ...

引用

Proceedings of the 2023 8th International Conference on systems, Control and Communications

作者： Kai Zhao Wei Xiong Xiaolan Yu Space Engineering University Science and Technology on Complex Electronic System Simulation Laboratory China

ISBN: (纸本)9798400707810

Synthetic aperture radars (SARs), characterized by their excellent performance, have found wide use in military applications. SAR-based image recognition is an important research area. Neural networks (NNs) have been widely used for image recognition and have demonstrated high recognition accuracy. However, NNs require a significant amount of data for training. In situations with limited training data, it is difficult to obtain satisfactory recognition accuracy using NNs. One approach toward alleviating the problems associated with small training sets is data augmentation. Here, we propose a novel SAR-based image augmentation method: using CycleGAN, aerial images are transformed into SARformat images, thereby allowing expansion of the SAR dataset. To improve the quality of these transformed images, we designed two filters: 1) a pre-filter for selecting images that are suitable for the transformation and 2) a post-filter for selecting suitable images after the transformation; this allows approximating the transformed images as real SAR images. We validated our method on the SSDD dataset. Our experimental results show that compared with the traditional data augmentation method, our method exhibits better recognition performance. With only 300 transformed images, the mean average precision improved from 66% to 76%, using only a small fraction of the SSDD dataset, thus overcoming the problem of small-sized training sets.

关键词： Cycle GAN Image augmentation Synthetic aperture radars

来源：评论

学校读者我要写书评

暂无评论

Research on Segmented Reconstruction Multiple False Targets Suppression Jamming technology based on Improved Quantum-Real Genetic Algorithm

Research on Segmented Reconstruction Multiple False Targets ...

引用

IET International Radar Conference 2023, IRC 2023

作者： Wang, Qingping Wang, Yanqi Wang, Chao Gong, Zhenghui Yuan, Naichang College of Electronic Science and Technology National University of Defense Technology Changsha China State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System National University of Defense Technology Changsha China

ISBN: (纸本)9781839539954

An improved quantum-real hybrid genetic algorithm (IQGA-RGA) with a segmental-reconstruction jamming-signal optimization model is proposed for the segmental reconstruction of a multi-false target jamming-signal optimization problem. The jamming evaluation function is set based on the mean-level constant false-alarm detection threshold, and the objective function is optimized using IQGA-RGA. The introduction of local quantum catastrophes at the early stage of evolution improves the optimization speed of the algorithm at an early stage. With improved optimization effect under the initial quantum coding condition, the optimization result of the real-coded genetic algorithm at the later stage is closer to the global optimal solution. Simulation results show that compared with the real number-coded genetic algorithm and quantum genetic algorithm, the IQGA-RGA has the characteristics of fast convergence speed and strong optimization searching ability, and it can effectively solve the optimization problem of segmented reconstructed jamming signals. © The Institution of Engineering & technology 2023.

关键词： Constant false alarm rate detection Jamming signal optimization Quantum genetic algorithm Radar jamming

来源：评论

学校读者我要写书评

暂无评论

A Service Mining Scheme Based on Semantic for Internet of Things

引用

Chinese Journal of electronics 2025年第2期23卷 236-242页

作者： Xinming Li Yan Sun The Science and Technology on Complex Electronic System Simulation Laboratory Academy of Equipment Beijing China The School of Computer Science Beijing University of Posts and Telecommunication Beijing China

As the development of Internet of things (IOT), massive sensors have been deployed as the public infrastructure. With the development of in-depth applications in IOT, service discovery and composition are challenges to the end users. To handle this challenge, we develop a service mining scheme based on semantic for IOT to provide users with interesting composite services. In this scheme, services can be combined and recommended to users actively according to the calculation of service similarity and an updatable semantic database. By the results of service similarity, useless compositions can be filtered out so that energy consumption on service flooding will be reduced. The update strategy of semantic database is also given out, by which the composite services can keep up with time and be more applicative. The benefits of the proposed method are that all operations such as calculating, filtering, and updating are simple enough to be performed in sensor networks.

关键词： Smart buildings Databases Filtering Semantics Public infrastructure Ontologies Sensor systems Internet of Things Floods Intelligent sensors

来源：评论

学校读者我要写书评

暂无评论

A Light Gradient Boosting Machine Based Effectiveness Prediction Method of Space Reconnaissance system

A Light Gradient Boosting Machine Based Effectiveness Predic...

引用

IEEE Advanced Information technology, electronic and Automation Control Conference (IAEAC)

作者： Jiahuan Liu Ping Jian Science and Technology on Complex Electronic System Simulation Laboratory Space Engineering University Beijing China

To address the problem of effectiveness evaluation of space reconnaissance systems with limited data sets, vast array of indexes and inadequate model interpretability, an interpretable effectiveness prediction method based on Light Gradient Boosting Machine(LightGBM) and the Shapley Additive exPlanations(SHAP) is proposed. The thorough evaluation process is given and the index system of space reconnaissance systems is built. Then LightGBM is used to establish a nonlinear mapping the model between the indexes and the effectiveness. Additionally, the model’s hyperparameters are adjusted using Bayesian optimization to improve accuracy and lessen computational load. Furthermore, the feasibility of the proposed method is validated by modeling and evaluating the performance of the space reconnaissance system under a particular operational scenario. The experimental results show that compared with other mainstream machine learning methods, the proposed method has higher prediction accuracy and can efficiently extract the potential characteristics of the space reconnaissance system.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A study on finite false target jamming for radar track generation

A study on finite false target jamming for radar track gener...

引用

2023 International Conference on electronic Information Engineering and Data Processing, EIEDP 2023

作者： Wang, Yanqi Wang, Chao Shi, Qingzhan Huang, Jingjian Yuan, Naichang College of Electronic Science and Technology National University of Defense Technology Changsha410073 China State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System National University of Defense Technology Changsha410073 China

ISBN: (纸本)9781510666160

To solve the problem that radar can still generate effective tracks to the covered target under the existing false target jamming technology, a method of jamming radar target track generation using finite false target signals is proposed through the plot and track correlation process of the radar in the initial stage of target searching and tracking. Through electronic reconnaissance, interception, and retransmission of radar signals by a jammer, a finite number of false target signals with random movement characteristics are generated around the covered target, interfering with track correlation during target data processing by radar. Simulation examples demonstrate the effectiveness of the proposed method. © 2023 SPIE.

关键词： Data handling

来源：评论

学校读者我要写书评

暂无评论

Multiple interferences suppression with space-polarization null-decoupling for polarimetric array

引用

Journal of systems Engineering and electronics 2021年第1期32卷 44-52页

作者： LU Yawei MA Jiazhi SHI Longfei QUAN Yuan State Key Laboratory of Complex Electromagnetic Environmental Effects on Electronics and Information System College of Electronic ScienceNational University of Defense TechnologyChangsha 410073China

The adaptive digital beamforming technique in the space-polarization domain suppresses the interference with forming the coupling nulls of space and polarization *** there is the interference in mainlobe,it will cause serious mainlobe distortion,that the target detection suffers *** overcome this problem and make radar cope with the complex multiple interferences scenarios,we propose a multiple mainlobe and/or sidelobe interferences suppression method for dual polarization array ***,the proposed method consists of a signal preprocessing based on the proposed angle estimation with degree of polarization(DoP),and a filtering criterion based on the proposed linear *** signal preprocessing provides the accurate estimated parameters of the interference,which contributes to the criterion for null-decoupling in the space-polarization domain of *** proposed method can reduce the mainlobe distortion in the space-polarization domain while suppressing the multiple mainlobe and/or sidelobe *** effectiveness of the proposed method is verified by simulations.

关键词： multiple interferences suppression dual polarization array radar null-decoupling

来源：评论

学校读者我要写书评

暂无评论

Analysis of node importance of satellite network based on triangular motif

Analysis of node importance of satellite network based on tr...

引用

2023 International Conference on Communication Network and Machine Learning, CNML 2023

作者： Pei, Zhongmin Hu, Boren Luo, Zhangkai Ding, Jie Science and Technology on Complex Electronic System Simulation Laboratory Space Engineering University Beijing101416 China Department of Electronics and Optical Engineering Space Engineering University Beijing101416 China

ISBN: (纸本)9798400716683

Motif provides a local high-order substructure angle for the analysis of network structure evolution, which is of great significance for the study of the interaction between satellite network structure and function. Taking the time scrambling null motif in steady state as a reference, the stability analysis of satellite network structure is carried out from the perspective of the local structure of the motif characteristics;define the temporal degree of satellite network, and propose a satellite network node importance analysis method based on the number of node-constructed triangle motifs, and compare the changes of motifs characteristics under the deliberate attack of temporal degree and based on triangle motifs. Simulation experiments are conducted on 46-node GPS constellations containing satellites and ground stations, and it is found that the network with higher initial triangle concentration showed higher stability. In GPS satellite network where the number of node triangle motif is positively correlated with their temporal degree, the attack strategy based on the triangle motif accelerates the attenuation of the triangle subgraph, and the node importance analysis method of the satellite network has higher accuracy. © 2023 ACM.

关键词： Satellites

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：