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International Applied Computational Electromagnetics Society Symposium (ACES)

作者： Zhicheng Wu Xianglin Kong Jun Wang Ruofeng Xu Lei Zhao Yinfang Xu School of Information and Control Engineering China University of Mining and Technology Xuzhou China National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing China

In this paper, a full-space beam scanning antenna based on spoof surface plasmon polaritons (SSPPs) is proposed. The proposed antenna is composed of a SSPPs loaded by the varactor diodes and periodic metallic patches. The periodic patches can transform the slow waves from SSPPs into fast waves, and the cutoff frequency can be reconfigured by changing the capacitance of the varactor diode, which will make the radiation angle of the beam change within a fixed frequency. Simulation results show that the radiation angle ranges from −90° to 90° at 9 GHz.

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Design and Simulation of a Planar Printed Slot Array Antenna

Design and Simulation of a Planar Printed Slot Array Antenna

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2023 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition, iWEM 2023

作者： Xiaofei, Shi Jiaxin, Shi Jiaqi, Liu Zhongyi, Fang Lei, Wang Lizhong, Song Shandong Institute of Space Electronic Technology Yantai264003 China Harbin Institute of Technology School of Electronics and Information Engineering Harbin150001 China Harbin Institute of Technology at Weihai School of Information Science and Engineering Weihai264209 China Beijing Institute of Space Long March Vehicle National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing100076 China Shandong Huayu Aerospace Technology Co. Ltd Yantai264003 China

ISBN: (纸本)9798350336740

This paper designs an array antenna with a planar printed structure. The antenna element adopts a rectangular slot antenna, and the antenna element is excited by a T-shaped feeding structure. The microstrip power distribution network is used to feed the antenna radiator array with equal power. The microstrip power distribution network and slot radiator array are located on top and bottom of dielectric substrate, and the array antenna is implemented by use of the printed circuit technology. In order to improve the gain, a metal reflector ground is placed below the dielectric substrate. A planar printed slot array antenna working in X band is designed. The coaxial line is used to feed the array antenna at the bottom. The whole antenna structure is easy to feed and suitable for fabrication. The designed array antenna was numerically calculated using full wave electromagnetic simulation software. At a working frequency of 10.1GHz, the voltage standing wave ratio (VSWR) of the antenna is about 1.35, and the gain is about 21.46dB. The design of the antenna scheme can be used as a reference for the actual application of engineering. © 2023 IEEE.

关键词： Slot antennas

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Doffnet: A Distant Objects Rgb-T Semantic Segmentation Method Based on Cross-Level Interaction Fusion Network

SSRN

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SSRN 2024年

作者： Chen, Yu Li, Xiang Luan, Chao Hou, Weimin Liu, Haochen Xue, Lian Zhu, Zihui Zhang, Jianqi Liu, Delian Wu, Xin Wei, Linfang Jian, Chaochao Li, Jinze Academy of Military Sciences School of Physics and Optoelectronic Engineering Xidian University Xi’an710071 China Beijing Institute of Control & Electronics Technology Beijing100038 China National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing100076 China

RGB-T segmentation represents an innovative approach driven by advancements in multi-spectral detection, poised to replace traditional RGB segmentation methods. An effective cross-modality feature fusion module is essential for this technology;simultaneously, the precise segmentation of distant objects is likewise a significant challenge. Building on these two focuses, we propose an end-to-end distant object feature fusion network (DOFFNet) for RGB-T segmentation. Initially, we introduce a cross-level interaction fusion strategy (CLIF) and an inter-correlation fusion method (IFFM) in the encoder to enhance multi-scale feature expression and improve fusion accuracy. Subsequently, we propose a residual-dense pixel convolution (R-DPC) in the decoder with a trainable upsampling unit, which dynamically reconstructs information lost during encoding, particularly for distant objects whose features may vanish after pooling. Experimental results demonstrate that DOFFNet improves accuracy across five classes and effectively segments distant objects occupying 0.2-2% of total pixels, enhancing overall segmentation quality and detailed understanding of RGB-T scenes. © 2024, The Authors. All rights reserved.

关键词： Semantic Segmentation

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Design of a Printed Monopole Array Antenna with the Simple Feeding Structure

Design of a Printed Monopole Array Antenna with the Simple F...

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2023 International Applied Computational Electromagnetics Society Symposium, ACES-China 2023

作者： Xiaofei, Shi Yizhuo, Liu Jiaqi, Liu Yizhong, Fang Zhiwei, Gao Lei, Wang Lizhong, Song Shandong Institute of Space Electronic Technology Yantai China School of Electronics and Information Engineering Harbin Institute of Technology Harbin150001 China School of Information Science and Engineering Harbin Institute of Technology at Weihai Weihai264209 China Beijing Institute of Space Long March Vehicle National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing100076 China School of Information Science and Technology Shijiazhuang Tiedao University Shijiazhuang050043 China Shandong Huayu Aerospace Technology Co.Ltd Yantai264003 China

ISBN: (纸本)9781733509657

This paper introduces an array antenna by use of printed monopole antennas as element. The designed array antenna consists of two layers of dielectric substrate and a metal reflective ground. The array antenna element adopts trapezoidal printed monopole antenna, and the element is fed by coplanar waveguide (CPW). The array antenna radiator is located on the top of the upper dielectric substrate, and the feeding microstrip power divider network is located on the bottom of the lower dielectric substrate. The antenna element radiator is vertically connected to the microstrip feeding power divider network in a coaxial-like manner. The whole structure of the antenna is simple, and the feeding structure is convenient, which makes it suitable for fabrication and assembly. A printed 4x4 monopole array antenna was designed and the relevant simulated results are provided. The simulation results show that at the 10GHz, the designed array antenna has a gain of approximately 12.73 dB and a return loss of approximately -11.75 dB. The antenna scheme discussed in this paper can provide technical reference for the design of planar printed array antennas. © 2023 Applied Computational Electromagnetics Society (ACES).

关键词： Microstrip antennas

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Simulation of a dual-polarized printed dipole antenna with a rectagular cavity 11

Simulation of a dual-polarized printed dipole antenna with a...

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11th IEEE Asia-Pacific Conference on Antennas and Propagation, APCAP 2023 - Proceedings

作者： Wang, Qian Zhang, Jianchuan Liu, Jiaqi Fang, Zhongyi Fang, Liang Zhang, Junrui The Research Institute for Special Structures of Aeronautical Composite Avic The Aeronautical Science Key Lab for High Performance Electromagnetic Windows Shandong Ji'nan China School of Information Science and Engineering Harbin Institute of Technology at Weihai Weihai264209 China Beijing Institute of Space Long March Vehicle National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing100076 China Shandong University at Weihai Weihai264209 China

ISBN: (纸本)9798350326277

This paper presents the design of a dual-polarized printed dipole antenna operating at 2GHz. In order to enhance the radiation characteristics of the antenna, a rectangular metallic cavity is positioned beneath the printed dipole *** antenna utilizes an exponentially tapered geometric shape for the printed dipole radiator, and it is fed using CPW technology. To mitigate mutual interference between the feeding structures, a bridge structure is implemented for one of the polarization ports. Electromagnetic simulation is conducted to evaluate the performance of the dual-polarized antenna. © 2023 IEEE.

关键词： dipole antenna dual-polarized antenna printed antenna rectangular cavity

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Spiral Antenna Loaded with Directors for GPR Application 13

Spiral Antenna Loaded with Directors for GPR Application

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13th International Conference on Microwave and Millimeter Wave technology, ICMMT 2021

作者： Jiang, Zhiye Liu, Yaokun Liu, Shufang Shi, Xiaowei National Key Laboratory Of Science And Technology On Test Physics And Numerical Mathematics Beijing100076 China School Of Electronic Engineering Xidian University Xi'an710071 China

ISBN: (纸本)9781665434379

The antenna is one of the most critical components in the ground penetrating radar system. The spiral Antenna has the characteristics of ultra-wideband, circular polarization and small size, making it suitable for underground target detection. In this paper, a high-gain helical antenna is designed. Its |S11| is less than -10dB from 380MHz to 4GHz and the bandwidth is greater than 10:1, while a unidirectional radiation is achieved by embedding the antenna into a cylindrical cavity. At the same time, directors are loaded in the maximum radiation direction of the antenna to increase the gain of the antenna. The peak gain is 11.5dBi. The size of the antenna is 240mm×240mm×97mm. © 2021 IEEE.

关键词： Helical antennas

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Application of Graphic Electromagnetic Computing in Electrically Large Scale Composite Target Scattering

Application of Graphic Electromagnetic Computing in Electric...

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International Applied Computational Electromagnetics Society Symposium (ACES)

作者： Lu Gao Ning Fang Mingliang Wang Jiaqi Liu Yanan Li Runhui Wu Yinfang Xu National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing China Academy of electronic information engineering Beihang University Beijing China National Key Laboratory of Science and Technology on Test Physics Beijing China

The radar cross section(RCS) calculation model of electrically large-scale composite target is established by combining graphic electromagnetic computing(GRECO) with high-frequency optical approximation and physical diffraction. Using different illumination modes, the normal vector at each point on the target surface is obtained, and the total scattering field of the target is acquired by the coherent superposition of the scattering field and the diffraction field at each point on the target surface.

关键词： Graphics Optical diffraction Laser radar Diffraction Computational modeling Lighting Optical computing

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INTRA-PULSE MODULATION FEATURE ANALYSIS AND PARAMETER ESTIMATION OF PHASE AND FREQUENCY MULTI-MODULATION SIGNAL

INTRA-PULSE MODULATION FEATURE ANALYSIS AND PARAMETER ESTIMA...

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IET International Radar Conference 2023, IRC 2023

作者： Xue, Chenle Jiang, Zhiye Ren, Lixiang Fan, Huayu Liu, Quanhua Radar Research Lab School of Information and Electronics Beijing Institute of Technology Beijing100081 China Key Laboratory of Electronic and Information Technology in Satellite Navigation Beijing Institute of Technology Ministry of Education Beijing100081 China National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing Institute of Space Long March Vehicle Beijing100076 China Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing314019 China Chongqing Innovation Center Beijing Institute of Technology Chongqing401120 China

ISBN: (纸本)9781839539954

The parameter inversion of multi-modulation waveforms has always been a key and difficult problem in the field of electronic reconnaissance. To solve this problem, a method for intra-pulse modulation feature analysis and parameter estimation of phase and frequency multi-modulation signal is proposed in this paper. Firstly, we apply square preprocessing to eliminate the binary phase coded modulation information. Then, subpulse separation and subpulse parameter estimation are achieved by using the smooth pseudo-Wigner Ville distribution (SPWVD) and wavelet transform. Moreover, histogram statistics are introduced to improve the robustness of the method. Finally, the N-order phase difference is proposed for recovering binary phase coded sequences. Frequency domain filtering and sliding window averaging are also added to further improve the applicability of the proposed method under low signal-to-noise ratio (SNR) conditions. Simulation results suggest that the method proposed in this paper can achieve accurate signal inversion and has good robustness. © The Institution of Engineering & technology 2023.

关键词： Wigner-Ville distribution

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Intelligent Assignment Strategy for Multi-Target Adversarial Interception

Intelligent Assignment Strategy for Multi-Target Adversarial...

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2022 Chinese Automation Congress, CAC 2022

作者： Yu, Yang Fang, Yizhong Wu, Han Han, Tuo Hu, Qinglei Beihang University School of Automation Science and Electrical Engineering Beijing100191 China Beijing Institute of Space Long March Vehicle National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing100076 China Beihang University School of Aeronautic Science and Engineering Beijing100191 China Hangzhou310023 China

ISBN: (纸本)9781665465335

The multi-missile confront multi-target is a classic target allocation issue in the combat scenario of multiple missiles intercepting multiple maneuvering targets. Traditional algorithms lack environmental assessment model, train quality, and indicator function in the adversarial environment. To this end, this paper aims to propose an intelligent assignment strategy which contains indicator function and evaluation model. Then, an indicator function and an evaluation model considering the miss distance, threat situation, and the number of specified interception targets are introduced into the reinforcement learning algorithm. The local and global reward functions are introduced to improve the training convergence and efficiency in the multi-missile multi-target confrontation scenario. Finally, simulation results are designed to check on advantage of intelligent allocation strategy. © 2022 IEEE.

关键词： Reinforcement learning

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Perturbation Estimated Incremental Guidance for Exo-Atmospheric Interception

Perturbation Estimated Incremental Guidance for Exo-Atmosphe...

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2022 Chinese Automation Congress, CAC 2022

作者： Lu, Yuting Liu, Peng Han, Tuo Hu, Qinglei Beihang University School of Automation Science and Electrical Engineering Beijing100191 China Beijing Institute of Space Long March Vehicle National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing100076 China Beihang University School of Aeronautic Science and Engineering Beijing100191 China Hangzhou310023 China

ISBN: (纸本)9781665465335

In order to meet the requirement of accurate intercept against the increased target maneuverability and external disturbance, a second-order inertial delay based incremental guidance law (IDIASMG) is proposed for an exo-atmospheric interceptor. Specifically, a three-dimensional guidance model is transformed into an incremental version. As a guidance design benchmark, a conventional sliding mode guidance law (SMG) is presented, and a sliding mode incremental guidance law (ISMG) is designed with gain adaptation. Moreover, a second-order inertial delay filter is utilized to estimate and compensate guidance perturbation including the target maneuver, system uncertainty, and external disturbance. Theoretical analysis shows that the incremental guidance requires smaller gains to ensure smaller system residual than the conventional SMG. Extensive numerical simulations validate the effectiveness and robustness of IDIASMG. © 2022 IEEE.

关键词： Uncertainty analysis

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