检索结果-内蒙古大学图书馆

2023 International Conference on Algorithms, High Performance Computing, and Artificial Intelligence, AHPCAI 2023

作者： Mu, Lin Science and Technology on Underwater Test and Control Laboratory Dalian China

ISBN: (纸本)9781510671881

The modulation spectrum processing of ship target radiated noise is an important means of detecting, tracking, and recognizing targets in naval operations. Improving the processing performance of modulation spectrum is crucial for enhancing naval combat capabilities. This paper combines traditional modulation spectrum processing methods with deep learning methods and proposes a modulation spectrum feature enhancement method based on deep learning. The experimental results show that, the method can effectively improve the clarity and extraction quality of the line spectrum in the modulation spectrum time-frequency map. © 2023 SPIE. All rights reserved.

关键词： Deep learning

来源：评论

学校读者我要写书评

暂无评论

Joint Task Offloading and Resource Allocation Strategy for Space-Air-Ground Integrated Vehicular Networks

引用

清华大学学报自然科学版（英文版） 2025年第3期30卷 1027-1043页

作者： Yuanshuo Gang Yuexia Zhang Zhihai Zhuo School of Information and Communication Engineering Beijing Information Science and Technology UniversityBeijing 100101China Key Laboratory of Modern Measurement and Control Technology Ministry of EducationBeijing Information Science and Technology UniversityBeijing 100101China

Space-Air-Ground integrated Vehicular Network(SAGVN)aims to achieve ubiquitous connectivity and provide abundant computational resources to enhance the performance and efficiency of the vehicular ***,there are still challenges to overcome,including the scheduling of multilayered computational resources and the scarcity of spectrum *** address these problems,we propose a joint Task Offloading(TO)and Resource Allocation(RA)strategy in SAGVN(namely JTRSS).This strategy establishes an SAGVN model that incorporates air and space networks to expand the options for vehicular TO,and enhances the edge-computing resources of the system by deploying edge *** minimize the system average cost,we use the JTRSS algorithm to decompose the original problem into a number of subproblems.A maximum rate matching algorithm is used to address the channel allocation and the Lagrangian multiplier method is employed for computational *** acquire the optimal TO decision,a differential fusion cuckoo search algorithm is *** simulation results demonstrate the significant superiority of the JTRSS algorithm in optimizing the system average cost.

关键词： edge computing Resource Allocation(RA) Space-Air-Ground integrated Vehicular Network(SAGVN) Task Offloading(TO)

来源：评论

学校读者我要写书评

暂无评论

Spatial Distribution Feature Extraction Network for Open Set Recognition of Electromagnetic Signal

引用

Computer Modeling in Engineering & sciences 2024年第4期139卷 279-296页

作者： Hui Zhang Huaji Zhou Li Wang Feng Zhou The Ministry Key Laboratory of Electronic Information Countermeasure and Simulation Xidian UniversityXi’an710071China Science and Technology on Communication Information Security Control Laboratory Jiaxing314033China

This paper proposes a novel open set recognition method,the Spatial Distribution Feature Extraction Network(SDFEN),to address the problem of electromagnetic signal recognition in an open *** spatial distribution feature extraction layer in SDFEN replaces convolutional output neural networks with the spatial distribution features that focus more on inter-sample information by incorporating class center *** designed hybrid loss function considers both intra-class distance and inter-class distance,thereby enhancing the similarity among samples of the same class and increasing the dissimilarity between samples of different classes during ***,this method allows unknown classes to occupy a larger space in the feature *** reduces the possibility of overlap with known class samples and makes the boundaries between known and unknown samples more ***,the feature comparator threshold can be used to reject unknown *** signal open set recognition,seven methods,including the proposed method,are applied to two kinds of electromagnetic signal data:modulation signal and real-world *** experimental results demonstrate that the proposed method outperforms the other six methods overall in a simulated open ***,compared to the state-of-the-art Openmax method,the novel method achieves up to 8.87%and 5.25%higher micro-F-measures,respectively.

关键词： Electromagnetic signal recognition deep learning feature extraction open set recognition

来源：评论

学校读者我要写书评

暂无评论

Deep radio signal clustering with interpretability analysis based on saliency map

引用

Digital Communications and Networks 2024年第5期10卷 1448-1458页

作者： Huaji Zhou Jing Bai Yiran Wang Junjie Ren Xiaoniu Yang Licheng Jiao School of Artificial Intelligence Xidian UniversityXi’an710071China Science and Technology on Communication Information Security Control Laboratory Jiaxing314033China

With the development of information technology,radio communication technology has made rapid *** radio signals that have appeared in space are difficult to classify without manually *** radio signal clustering methods have recently become an urgent need for this ***,the high complexity of deep learning makes it difficult to understand the decision results of the clustering models,making it essential to conduct interpretable *** paper proposed a combined loss function for unsupervised clustering based on *** combined loss function includes reconstruction loss and deep clustering *** clustering loss is added based on reconstruction loss,which makes similar deep features converge more in feature *** addition,a features visualization method for signal clustering was proposed to analyze the interpretability of autoencoder utilizing Saliency *** experiments have been conducted on a modulated signal dataset,and the results indicate the superior performance of our proposed method over other clustering *** particular,for the simulated dataset containing six modulation modes,when the SNR is 20dB,the clustering accuracy of the proposed method is greater than 78%.The interpretability analysis of the clustering model was performed to visualize the significant features of different modulated signals and verified the high separability of the features extracted by clustering model.

关键词： Unsupervised radio signal clustering Autoencoder Clustering features visualization Deep learning interpretability

来源：评论

学校读者我要写书评

暂无评论

Sea Clutter Measurement Test and Amplitude Characteristics Analysis in the South China Sea Nearshore Area

Sea Clutter Measurement Test and Amplitude Characteristics A...

引用

2022 International Conference on information Processing in Ocean science and technology, ICIPOST 2022

作者： Zhao, X. Han, J. Zhang, X. Zhang, J. Li, P. Science and Technology on Underwater Test and Control Laboratory Dalian116013 China

To address the problem of sea clutter amplitude distribution characteristics varying with bandwidth, this paper obtains the raw data of clutter under different polarization methods of HH and VV in X and Ka bands based on the sea clutter measurement experiment carried out in June 2022 in the near-shore waters of South China Sea. For the data in X-band HH polarization mode, the goodness-of-fit test was conducted based on the classical models of Rayleigh, Weibull, log-normal and K distribution for the amplitude distribution characteristics of the sea clutter, and the variation of the estimated parameters of the distribution model with the bandwidth was analyzed. The test data show that: 1, with the increase of bandwidth sea clutter amplitude decreases;2, with the increase of bandwidth Weibull distribution model parameters are decreasing trend, k distribution parameters are increasing trend;3, the test conditions, the offshore sea clutter amplitude distribution is the optimal K distribution. The conclusions of this paper can provide a comparison and reference for the subsequent study on the characteristics of sea clutter distribution. © Published under licence by IOP Publishing Ltd.

关键词： Bandwidth

来源：评论

学校读者我要写书评

暂无评论

A High-gain 3D-printed Phased Array Antenna for Satellite Applications

A High-gain 3D-printed Phased Array Antenna for Satellite Ap...

引用

2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Xie, Jiahao Zhang, Kuo Zuo, Le Science and Technology on Electronic Information Control Laboratory China

ISBN: (纸本)9798350375909

In this paper, a high-gain 3d-printed phased array antenna is proposed for satellite applications. A multi-mode horn antenna is designed as the radiating element of the proposed phased array antenna. By optimizing the spline function curve of the inner wall of the horn section, multi-mode electric field is excited in the horn aperture, therefore the radiating element can obtain higher aperture efficiency and more compact size. The phased array antenna is composed of 25 4 × 4 subarrays and the horn section of each subarray is fabricated by the 3d-printed technology. The simulated results indicate that the proposed phased array antenna has the bandwidth of 17.8-21.2 GHz with the voltage standing wave ratio (VSWR) below 1.35, and achieves ±8.7° beam scanning range in both E and H plane. The peak gain of the phased array antenna is 42.2 dBi at center frequency 19.2 GHz and the coverage gain of the phased array antenna are 40.9 dBi and 41.3 dBi in E and H plane at center frequency 19.2 GHz, respectively. © 2024 IEEE.

关键词： Horn antennas

来源：评论

学校读者我要写书评

暂无评论

Design of Low Cross Polarization Phased Antenna Arrays for X-band Spaceborne SAR Applications

Design of Low Cross Polarization Phased Antenna Arrays for X...

引用

2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Zhang, Kuo Xie, Jiahao Liu, Zhenyang Yu, Songtao Science and Technology on Electronic Information Control Laboratory China

ISBN: (纸本)9798350375909

In this paper, a type of low cross polarization phased antenna arrays for X-band spaceborne synthetic aperture radar (SAR) applications is presented. The horizontal polarization radiation performance is realized with ridged-waveguide longitudinal slotted antenna arrays. The arrays are divided into several subarrays according to the scanning requirements of the phased array antennas, and V type slot is employed in ridged-waveguide wide wall as radiation unit. Excellent capacities such as matching characteristics, high efficiency and low cross polarization are achieved by adjusting the penetration angle and depth of the V slot. In the azimuth direction, the slotted waveguide antenna is designed as a linear array, and the low profile characteristics of antenna is realized by adopting stereoscopic coupling feeding technology. In the range direction, the narrow-wall dimensions of the ridged-waveguide is compressed by the ridged-waveguide to optical-waveguide mode conversion technology, and the preferable grating lobe performance is assured. A panel of 10 × 32 ridged-waveguide slotted antenna arrays with the active transceiver module are designed and fabricated, which are composed with 10 subarrays in azimuth direction and 32 subarrays in range direction, and each subarray contains 20 V slotted radiators, the total size of the phased antenna arrays is 121.6λ0 × 23.4λ0. The measured result shows a good agreement with the designed and calculated values, the normal efficiency exceeds 80% and the cross polarization level is lower than -30 dB in working band-with, and the modular design and compact structure, it is suitable for sapceborne SAR system, and the arrays in orbit is in good use. © 2024 IEEE.

关键词： Antenna phased arrays

来源：评论

学校读者我要写书评

暂无评论

Application of X-band High Isolation Phased Array Payload in Satellite Data Transmission Communication

Application of X-band High Isolation Phased Array Payload in...

引用

2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Liu, Zhenyang Zhang, Kuo Bao, Hongfei Song, Yang Science and Technology on Electronic Information Control Laboratory China

ISBN: (纸本)9798350375909

In this paper, a data transmission communication payload for low-orbit satellite constellation is designed and implemented, which is used for bidirectional data transmission between satellites and ground. The payload comprises a transmitting phased array and a receiving antenna module, the receiving antenna module comprises a wide-beam receiving antenna and a receiving front-end assembly, and the transmitting phased array integrates a transmitting antenna array, transmitting channel, frequency source, an up-and-down frequency conversion and a baseband processing module and a secondary power supply module. Each part of the transmission phased array adopts a modular design, and the signal is interconnected without cables through the motherboard and RF plug-in connectors, and the physical structure is compacts. Through the arrangement of transmitting and receiving antennas, filtering assistance, the effective filtering of the RF channel and the effective isolation of the frequency conversion channel realize the simultaneous operation of transmitting high EIRP and receiving high sensitivity in a wide angle range. At the same time, the payload also has a variety of capabilities such as simultaneous multi-user communication, on-orbit configurable key parameters, and on-orbit reconfigurable programs. © 2024 IEEE.

关键词： Antenna phased arrays

来源：评论

学校读者我要写书评

暂无评论

Design of the Real-time control System for a Large-scaled Phased Array Based on High-speed Serial Bus

Design of the Real-time Control System for a Large-scaled Ph...

引用

2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Wang, Wei Science and Technology on Electronic Information Control Laboratory China

ISBN: (数字)9798350375909

ISBN: (纸本)9798350375909

The realization of phase shift or delay of antenna array beam control based on FPGA. The accurate phase delay control of an active electronic scanning array (AESA) benefits from the implementation of the field programmable gate array (FPGA). Unfortunately, the complexity of phase delay control system increases as the scale of an AESA, and hence increasing the number of FPGAs that control the transmitting and receiving modules following each radiating element. This paper presents a system framework that combines the parallel processing capability of FPGA and high data transmission rate of low-voltage differential signaling (LVDS) bus protocol. The FPGA outputs the compressed data of the LVDS bus standard to the ASIC circuit, and the data is decoded into multi-bit low voltage transistor-transistor logic (LVTTL) data according to the corresponding decompression ratio by the destringer and phase-locked loop in the ASIC circuit. The data transmission rate can reach up to 360 Mbps. This proposed framework reduces the number of control lines to 22.2% compared to the traditional control method. © 2024 IEEE.

关键词： Phase locked loops

来源：评论

学校读者我要写书评

暂无评论

OCDM with Index Modulation for Autonomous underwater Vehicles Communication

IEEE Transactions on Intelligent Vehicles

引用

IEEE Transactions on Intelligent Vehicles 2024年 1-16页

作者： Jia, Zhenyu Zhang, Rongxin Chen, Zhong Yuan, Fei Key Laboratory of Underwater Acoustic Communication and Marine Information Technology Xiamen University Xiamen China School of Electronic Science and Engineering Xiamen University Xiamen China

Autonomous underwater vehicles (AUVs) equipped with acoustic modems are currently one of the important means of obtaining underwater environment data such as sounds and images. They rely on high-speed underwater acoustic (UWA) communication technology for data transmission tasks. Orthogonal chirp division multiplexing (OCDM) is a multicarrier method based on chirp spread spectrum (CSS) which has better reliability in frequency selective fading channels than orthogonal frequency division multiplexing (OFDM). In this work, we combine index modulation (IM) and propose an OCDM-IM system that provides faster data rates when it activates the same number of subchirps as OCDM. On the other hand, it activates fewer subchirps when the data rate is the same, so it has better anti-interference capability. The simulation results under a measured UWA channel and random channels and the experimental results show that OCDM-IM has a better bit-error rate (BER) performance than that of OCDM and OFDM-IM systems when the subchirps are not fully loaded. In particular, when a small number of subchirps are activated, OCDM-IM is able to provide up to 2x bit rate with more than 5 dB improvement in BER performance. Our simulation and experimental results also show that IM has much better reliability than constellation mapping when Doppler effect is considered. Therefore, OCDM-IM is more suitable for the communication of AUVs. IEEE

关键词： Peak to average power ratio

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：