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检索条件"机构=Key Laboratory of Aperture Array and Space Application"

共 121 条记录，以下是1-10 订阅

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Design of signal acquisition and waveform generation based on CX8242K 2

Design of signal acquisition and waveform generation based o...

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2nd International Conference on Frontiers of Applied Optics and Computer Engineering, AOCE 2025

作者： Huang, Zhen Wu, Bing Yu, Qingfa Dong, Huijuan No.38 Research Institute of China Electronic Technology Group Corporation Hefei China Key Laboratory of Aperture Array and Space Exploration Hefei China

ISBN: (纸本)9781510689404

Aiming at the design requirements of multi-channel high-speed signal acquisition in phased array antenna systems, a mid-frequency signal acquisition board based on RF direct sampling transceiver chip is designed and implemented, which realizes signal acquisition and digital waveform generation of 2 ADCs and 2 DACs. This paper introduces the hardware and software design of the high-speed signal acquisition board, and builds a testing system to verify its performance indicators. The ADC has a signal-to-noise ratio better than 55dB and a spurious free dynamic range better than 65dBc at a sampling rate of 1.6GHz in dual channel working mode. The DAC has an output power greater than - 5dBm and a spurious free dynamic range better than 60dBc at a conversion rate of 3.2GHz in dual channel working mode. This design adopts a modular design approach, expands the dynamic range of transmission and reception, improves product configuration flexibility, enhances system integration, and reduces overall power consumption and cost. © The Authors.

关键词： Integration testing

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Charging Out Rectangle: Quadrangle IoU for Scene Text Detection under Balanced Supervision 25

Charging Out Rectangle: Quadrangle IoU for Scene Text Detect...

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Proceedings of the 4th International Conference on Computer, Artificial Intelligence and Control Engineering

作者： Min Ma Xiangnan Zhang Wang Bin Qiuli Wang Kexing Che School of Computer Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing Jiangsu China Key Laboratory of Intelligent Information Processing Corporation Key Laboratory of Aperture Array and Space Application The 38th Research Institute of China Electronics Technology Group Hefei Anhui China Government and Enterprise Division China Unicom Shandong Branch Jinan Shandong China School of Electronic Engineering Xidian University Xi' an Shaanxi China

ISBN: (纸本)9798400712647

In the past few years, text detection approaches have been able to cope with more and more challenging complex scenes. In this field, the arbitrary shape and various scale of text instances are the two most frequently mentioned topics. Among the existing methods, the bounding box prediction methods based on Intersection over Union (IoU) are efficient, but can only handle multi-oriented rectangles. Although arbitrary shape text detection methods have been proposed, these methods are often aimed at curved text. Besides, the post-processing is usually cumbersome. Considering that the affine transformation phenomenon caused by out-plane rotation is more frequent than curved text in real scenario, we design a quadrangle IoU (QIoU) loss to efficiently predict arbitrary convex quadrangle text. Furthermore, we analyze the challenge of variable scale in text detection from the perspective of unbalanced supervision information, and propose a cross-scale knowledge distillation (CSKD) method to improve the detection accuracy of large-scale text. An extensive ablation study demonstrates the effectiveness and superiority of the proposed strategies. During inferring, our method does not consume extra time. Using the basic feature pyramid network for feature extraction, our method achieves state-of-the-art results on several popular datasets for scene text detection.

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application of Feature Selective Auto-encoder in Aero Target Recognition

Application of Feature Selective Auto-encoder in Aero Target...

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2021 CIE International Conference on Radar, Radar 2021

作者： Deng, Sheng Guo, Xiaonan NO.38 Research Institute of Cetc Key Laboratory of Aperture Array and Space Application Hefei China

ISBN: (纸本)9781665498142

Rader aero target recognition has important application value on modern war field. In this paper, a feature selection auto-encoder based radar aero target classification method is proposed. The proposed method can automatically select manual features and further extract high-level features for classification of helicopter, propeller and jet. In experiments, real application data is used for the classification. Experimental results indicate the efficiency of the proposed method. © 2021 IEEE.

关键词： Aero target classification Auto-encoder Deep learning Feature selection Radar

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Periodicity Estimation Method for RCS Sequence based on Convolution Self-Attention Network

Periodicity Estimation Method for RCS Sequence based on Conv...

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2021 CIE International Conference on Radar, Radar 2021

作者： Jiang, Xuesong Deng, Sheng Tian, Xilan Cai, Hongjun Research Institute of Cetc Hefei China Key Laboratory of Aperture Array and Space Application Hefei China

ISBN: (纸本)9781665498142

The RCS (Radar cross section) sequence usually contains the periodicity of the motion of the space target because of their stable or rolling attitude. However, the measured data are inevitably disturbed by various reasons. Most traditional period estimation methods require high data quality. In this paper, we propose a periodicity estimation method for RCS sequence using convolution self-attention networks. First, calculate the normalized RCS sequence. Then, highlight periodicity smooth local texture cased by noise, interference, or other movement using gamma correction. Finally, intercept fixed duration RCS sequence as the input of convolution self-attention networks to estimate the period. A certain amount of training data can ensure the performance of the proposed method. Experimental results show that the proposed method could obtain the comparatively accurate results and perform stably and reliably. © 2021 IEEE.

关键词： convolution self-attention networks gamma correction periodicity estimation

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Computing Offloading-based Task Scheduling for space-based Cloud-fog Networks 2

Computing Offloading-based Task Scheduling for Space-based C...

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2nd International Seminar on Artificial Intelligence, Networking and Information Technology, AINIT 2021

作者： Wang, Yapin Qi, Xiaoxia Lin, Xiaobin Wang, Xiyao Key Laboratory of Aperture Array and Space Application No. 38 Research Institute of Cetc Hefei China

ISBN: (纸本)9781665412964

With the continuous development of space technology, the traditional single-star single-chain satellite system cannot meet the increasing requirements of computing resources. The space-based cloud network is the main development direction in the future. In this paper, the space-based cloud-fog computing architecture is introduced, in addition, a hierarchical collaboration-based computing offloading (HCCO) scheme and a multi-point collaboration-based computing offloading (MPCO) scheme for space-based cloud-fog network task scheduling are proposed. The simulation results show that the proposed schemes can reduce the job complete time (JCT) and meet the low latency requirement of latency-sensitive services. © 2021 IEEE.

关键词： Fog

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Analysis of Thermal and Electromagnetic Fields Coupling on Active array Antennas 4

Analysis of Thermal and Electromagnetic Fields Coupling on A...

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4th International Applied Computational Electromagnetics Society Symposium in China, ACES-China 2021

作者： Zhang, Chen Zhang, Liming The 38th Research Institute of CETC Key Laboratory of Aperture Array and Space Application Hefei China

ISBN: (纸本)9781733509619

The thermal and electromagnetic field coupling problem has been an important bottleneck for active array antennas. This paper analyzes the coupled muti-field effects on both the active devices and passive antenna. The influence of temperature on a 12^{ast}12 array has been simulated. © 2021 Applied Computational Electromagnetics Society (ACES).

关键词： Antenna arrays

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A Ku-band Broadband Single-Ridge Waveguide Slot Antenna array for UAV SAR application 6

A Ku-band Broadband Single-Ridge Waveguide Slot Antenna Arra...

引用

6th Asia-Pacific Conference on Synthetic aperture Radar, APSAR 2019

作者： Zhenxian, Zhan Tanghong, Xu Shuaishuai, Hu Key Laboratory of Aperture Array and Space Application No. 38 Research Institute of CETC Hefei230088 China

ISBN: (数字)9781728129129

ISBN: (纸本)9781728129129

A Ku-band broadband waveguide wide side longitudinal slot antenna array for unmanned aerial vehicle (UAV) SAR application is designed. A single-ridge is employed to reduce the sectional size of the waveguide, and to achieve wide scanning ability. The bandwidth of the antenna is expanded by the single-ridge and subarea feeding of the slots. The active admittance of the waveguide slot is extracted based on the simulation using the HFSS software, in order to determine the size parameters of the waveguide slots. The simulation mode is built and the size parameters of the waveguide slots are modified and optimized by the aperture distribution re-deducing method. This design method has high efficiency and high veracity. An antenna array of 72 waveguide slot antenna lines is designed and manufactured. The measured results show that the relative bandwidth of VSWR smaller than 2 is 15%. The measured patterns show that the side lobe is smaller than -21.5dB, the cross polarization is better than -40dB, and the scanning angle is ±60° in azimuth direction. This waveguide slot antenna array has many advantages such as wide band, wide scanning, low side lobe and compact structure, and is suitable for UAV SAR application. © 2019 IEEE.

关键词： Ridge waveguides

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Investigation on classification of compact PolSAR data 11

Investigation on classification of compact PolSAR data

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11th European Conference on Synthetic aperture Radar, EUSAR 2016

作者： Tan, Lulu Wang, Ligang Lei, Sheng East China Research Institute of Electronic Engineering China Key Laboratory of Aperture Array and Space Application China

Compact polarimetry (CP) system effectively reduce the complexity and power consumption of full polarimetry system. In this paper, classification of different compact polSAR mode data is investigated and compared. Classification experiment of real data obtained by AirSAR is performed, and the experiment results provide some userful reference for compact polarimetric SAR system design. © VDE VERLAG GMBH · Berlin · Offenbach.

关键词： Classification (of information)

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A study and test on SAR-communication integrative system 11

A study and test on SAR-communication integrative system

引用

11th European Conference on Synthetic aperture Radar, EUSAR 2016

作者： Shen, Mingxing Wu, Bocai Sun, Long Jiang, Kai Yu, Hailong Hu, Shanxiang East-China Research Institute of Electronic Engineering China Key Laboratory of Aperture Array and Space Application-KLAASA China

This paper describes the development of the integrative system that contains the functions of both SAR and communication. This integrative system is designed based on the digit array radar technology and the arbitrary coded-wave generating technology. This integrative technology of SAR and communication will be useful for the air-borne and space-borne loads. Additionally, some estimation and tests have been done in order to evaluate the performance of this integrative system. © VDE VERLAG GMBH · Berlin · Offenbach.

关键词： Synthetic aperture radar

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Design and Verification of a Hybrid Multi-Beamforming system for SKA MFAA 23

Design and Verification of a Hybrid Multi-Beamforming system...

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23rd International Conference on Electromagnetics in Advanced applications, ICEAA 2022

作者： Cao, Rui Jiang, Lihui Li, Zhuang Tao, Xiaohui Peng, Guoliang Li, Kun Xu, Yulong Rong, Dawei Xu, Xiaorong Key Laboratory of Aperture Array and Space Application Hefei China Anhui University School of Electronic Information Engineering Hefei China

ISBN: (数字)9781665481113

ISBN: (纸本)9781665481113

A broadband hybrid muti-beamforming system applicable to SKA Mid-Frequency aperture array is presented in this paper. The hybrid beamforming system adopts a two-stage architecture that combines analog and digital beamforming. The analogue beamforming subsystem is able to provide a 16-element tile with 2~16 simultaneous beams covering ±45° spatial area and a flexible beam-selection capability by using a true-time delay and chessboard switching structure. The second-stage beamforming then produces beams in a full digital way within each input analog beam by CTPM that implements analog to digital converting, channelizer and digital beamforming. © 2022 IEEE.

关键词： Beamforming

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