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检索条件"机构=Key Lab. for Advanced Signal Processing"

共 800 条记录，以下是41-50 订阅

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Robust Adaptive Beamforming Based on MR-FDA-MIMO radar Jamming Suppression

Robust Adaptive Beamforming Based on MR-FDA-MIMO radar Jammi...

引用

IEEE International Conference on Radar

作者： Zhixia Wu Shengqi Zhu Jingwei Xu Lan Lan Yanhong Xu Ximin Li Jie Gao National Key Lab. of Radar Signal Processing Xidian University Xi’an China School of Communication and Information Engineering Xi’an University of Science and Technology Xi’an China

In this work, an adaptive beamforming algorithm based on a minimum redundancy frequency diverse array multiple-input multiple-output (MR-FDA-MIMO) radar is proposed. The algorithm utilizes the transmit virtual domain signal of a MR-FDA-MIMO radar to perform transmit adaptive beamforming, overcoming the limitations of transmit array elements and suppressing multiple mainlobe deceptive jamming. To mitigate the beamforming performance degradation resulting from including the true target in the samples, the jamming plus noise covariance matrix is restructured to obtain the optimal performance of jamming suppression. To fully utilize the virtual degree of freedom (DOF) in the transmit dimension of MR-FDA-MIMO radar, sidelobe barrage jamming and mainlobe deceptive jamming are suppressed separately. Sidelobe barrage jamming is suppressed in the receive dimension. Multiple false targets are suppressed in the equivalent transmit dimension. The simulation results demonstrate the effectiveness of the algorithm.

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A Novel Miniaturized Wideband High-Gain Palm-Leaf Vivaldi Array Antenna

A Novel Miniaturized Wideband High-Gain Palm-Leaf Vivaldi Ar...

引用

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

作者： Wang, Min Li, Xuan Xiang, Ceng Chen, Zhengchuan Chongqing University of Posts and Telecommunications Postdoctoral Res. Ctr. of Chongqing Key Lab. of Optoelectron. Info. Sensing and Transmiss. Technol. Chongqing400065 China Guilin University of Electronic Technology Guangxi Wireless Broadband Communication and Signal Processing Key Laboratory Guilin541004 China Chongqing University School of Microelectronics and Communication Engineering Chongqing400044 China

ISBN: (纸本)9798350336740

A novel miniaturized wideband high-gain palm-leaf Vivaldi array antenna is presented in this work. Firstly, a novel Vivaldi antenna element is designed. To miniaturize the element, three groups of arc-shaped slots of varying lengths are etched on the radiator and a transition structure from fan-shaped microstrip line to slotted line is introduced in the feeding structure. Besides, two rectangular slots are introduced to the both sides of the slotted line to suppress the sidelobe level. Then, in order to facilitate the cascading of elements, a 1×16 microstrip power division feed network with equal amplitude and same phase is designed. Finally, a wideband high-gain 4 × 4 Vivaldi array antenna is designed and simulated. Simulated results indicate that the relative bandwidth of the presented Vivaldi array antenna reaches 42.2% (3.6 GHz-5.6 GHz), and the gain reaches 15.8 dBi at 4.5 GHz. © 2023 IEEE.

关键词： Microwave antennas

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Multi-Feature Fusion Recognition of Space Micromotion Target

Multi-Feature Fusion Recognition of Space Micromotion Target

引用

2021 CIE International Conference on Radar, Radar 2021

作者： Tian, Xudong Bai, Xueru Zhou, Feng Xidian University xi'An Key Lab. of Electronic Information Countermeasure and Simulation Technology of Ministry of Education China Xidian University xi'An National Lab of Radar Signal Processing China

ISBN: (纸本)9781665498142

This paper proposes a recognition method of space micro-motion targets based on decision fusion. The proposed method extracts a 7-dimension(7D) feature vector including the information of time, Doppler, joint time-frequency(JTF) domains from the radar cross section (RCS);while extracts the inverse Radon transform pseudo-Zernike (IRT-pZ) feature from the JTF image. Finally, particle swarm optimization (PSO) is adopted to decision-level fusion, so as to realize high-precision recognition. The recognition results of electromagnetic simulated data under various conditions have demonstrated the effectiveness and robustness of the proposed method. © 2021 IEEE.

关键词： decision fusion Inverse synthetic aperture radar (ISAR) particle swarm optimization (PSO) space micro-motion target

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Sparse Aperture ISAR Imaging Based on UNet++

Sparse Aperture ISAR Imaging Based on UNet++

引用

2021 CIE International Conference on Radar, Radar 2021

作者： Li, Xiaoyong Bai, Xueru Zhou, Feng Xidian University Key Lab. of Electronic Information Countermeasure and Simulation Technology of Ministry of Education Xi'an China Xidian University National Lab of Radar Signal Processing Xi'an China

ISBN: (纸本)9781665498142

This article proposes a modified UNet++ for effective sparse aperture inverse synthetic aperture radar (ISAR) imaging. Firstly, Mapping from the true distribution of scattering centers to the original ISAR images is established. Then, modified UNet++ is used for sparse aperture ISAR imaging. The optimal network parameters can be obtained by end-to-end training using simulated data with different SNR. Experimental results have shown that the UNet++ can achieve noise-stable sparse aperture ISAR imaging with superior performance on both simulated and measured data. © 2021 IEEE.

关键词： deep networks Inverse synthetic aperture radar (ISAR) imaging sparse signal reconstruction UNet++

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Design of a Linearly Polarized Dual-Band Metal-Only Transmitarray Antenna Element 11

Design of a Linearly Polarized Dual-Band Metal-Only Transmit...

引用

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

作者： Wang, Min Hu, Yang Li, Xuan Hao, Honggang Chen, Zhengchuan Chongqing University of Posts and Telecommunications Postdoctoral Res. Ctr. of Chongqing Key Lab. of Optoelectron. Info. Sensing and Transmiss. Technol. Chongqing400065 China Guilin University of Electronic Technology Guangxi Wireless Broadband Communication and Signal Processing Key Laboratory Guilin541004 China Southeast University State Key Laboratory of Millimeter Waves Nanjing210096 China Chongqing University Chongqing400044 China

ISBN: (纸本)9798350326277

A linearly polarized dual-band metal-only transmitarray antenna (TA) element is proposed. The TA element consists of four identical metallic layers without dielectric substrates. An air gap is present between each pair of layers. The four identical metallic layers are positioned equidistantly and symmetrically along the z-axis. Each metallic layer consists of an interleaved orthogonal H-typed slot and a Jerusalem cross slot, which works at two different frequency band. By adjusting the length between two rectangular slots along the y-axis of the H-typed slot and the width of the Jerusalem cross slot, the lower frequency band and the upper frequency band can be controlled, respectively. The proposed TA element has a 3-dB transmission bandwidth is 18.0% and 14.0% in the lower frequency band and upper frequency band, respectively. Furthermore, the phase coverage of 330° and 360° with low loss is achieved at 10.0 GHz and 15.0 GHz, respectively. © 2023 IEEE.

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A Wideband All-Metal Folded Reflectarray Antenna Using a Novel Grid Polarizer 11

A Wideband All-Metal Folded Reflectarray Antenna Using a Nov...

引用

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

作者： Wang, Min Li, Xuan Hu, Nan Xie, Wenqing Luo, Wei Chongqing University of Posts and Telecommunications Postdoctoral Res. Ctr. of Chongqing Key Lab. of Optoelectron. Info. Sensing and Transmiss. Technol. Chongqing400065 China Guilin University of Electronic Technology Guangxi Wireless Broadband Communication and Signal Processing Key Laboratory Guilin541004 China Southeast University State Key Laboratory of Millimeter Waves Nanjing210096 China A-INFO Inc Beijing100084 China

ISBN: (纸本)9798350326277

This work presents a wideband all-metal folded reflectarray antenna using a novel grid polarizer. The proposed folded reflectarray antenna consists of a horn antenna for feeding, a reflective aperture composed of 35 × 35 reflective elements, and a novel grid polarizer capable transmit a linearly polarized wave while reflect its orthogonal polarized wave. The reflective element with a subwavelength is made up of two orthogonal rectangular metal plates etched with two trapezoidal slots, which allows to independently control orthogonal polarized waves. Then, a large smooth phase variation of 670° is achieved by varying the lengths of the slots. The element of the novel grid polarizer is designed as triple-layer rectangular metal patch etched with three parallel slots and one vertical slot. The simulated results show that the polarization selection bandwidth of the proposed grid polarizer reaches 53.5%. Then, a wideband all-metal folded reflectarray antenna in X-band is designed and simulated to verify the performance. The simulated results demonstrate that a peak aperture efficiency of 54.1% and a 3-dB gain bandwidth of over 34.2% are obtained. © 2023 IEEE.

关键词： All-metal folded refletarray antenna low cost low loss wideband

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Design of a Wideband 1-Bit Metal-Only Reconfigurable Reflectarray Antenna 11

Design of a Wideband 1-Bit Metal-Only Reconfigurable Reflect...

引用

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

作者： Li, Xuan Wang, Min Hu, Nan Xie, Wenqing Chen, Shulin Chongqing University of Posts and Telecommunications Postdoctoral Res. Ctr. of Chongqing Key Lab. of Optoelectron. Info. Sensing and Transmiss. Technol. Chongqing400065 China Guilin University of Electronic Technology Guangxi Wireless Broadband Communication and Signal Processing Key Laboratory Guilin541004 China Southeast University State Key Laboratory of Millimeter Waves Nanjing210096 China A-INFO Inc Beijing100084 China Australia

ISBN: (纸本)9798350326277

A 1-bit metal-only reconfigurable reflectarray antenna is proposed in this work. The element of the reflectarray antenna is a 3-D structure composed of a rectangular base, two orthogonal metal plates. By setting two cylindrical slots of different sizes on these two plates, 180° reflected phase difference of two orthogonal linearly polarized waves is obtained. By rotating the proposed element by 90°, the 1 -bit reflected phase can be achieved. Then, a 40 × 40 element reflective aperture spatially fed by a horn antenna is designed and simulated. The beam-scanning of the presented reconfigurable reflectarray antenna can be realized by rotating the elements on the reflective aperture. In simulation, a peak gain of 27.3dBi at 10GHz corresponding to an aperture efficiency of 29.0% are obtained. Furthermore, the maximum gain drop within 60° beam scanning range is 4.0 dB at 10.0GHz while the maximum beam pointing errors is only 1°. These results indicate that this reflectarray antenna has the advantages of high efficiency, wideband and high stability. © 2023 IEEE.

关键词： Beam-scanning high efficiency low cost metal- only reflectarray antenna

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Block Classification of PolSAR Images based on Density Peak Clustering

Block Classification of PolSAR Images based on Density Peak ...

引用

2021 SAR in Big Data Era, BIGSARDATA 2021

作者： Han, Binbin Han, Ping Cheng, Zheng Tianjin Key Lab of Advanced Signal Processing Civil Aviation University of China Tianjin China Engineering Techniques Training Center Civil Aviation University of China Tianjin China

ISBN: (纸本)9781665401234

Polarimetric synthetic aperture radar (PolSAR) image interpretation tends to design complex models to describe data distribution, but there is little research on simplifying the complexity of image scenes and reducing the difficulty of interpretation. This paper proposes an effective unsupervised classification algorithm by combining density peak clustering with image blocking strategy. The algorithm firstly divides the preprocessed complex large scene image into several simple local images, then carries out initial classification in local images based on h/q decomposition features and gray features of PauliRGB image, and completes optimization in local images with Wishart classifier. Finally, unsupervised classification is realized by combining clusters of small scenes to the specified cluster number by density peak clustering. The experimental results of San Francisco data collected by American AIRSAR system show that the algorithm can significantly improve the classification effect. © 2021 IEEE.

关键词： Image classification

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High-Resolution ISAR Imaging Based on 2-D Fast Sparse Bayesian Learning

High-Resolution ISAR Imaging Based on 2-D Fast Sparse Bayesi...

引用

2021 CIE International Conference on Radar, Radar 2021

作者： Zhang, Yujie Bai, Xueru Li, Xiaoyong Xidian University National Laboratory of Radar Signal Processing Xi'an China Xidian University Key Lab. of Electronic Information Countermeasure and Simulation Technology of Ministry of Education Xi'an China

ISBN: (纸本)9781665498142

We address the problem of high-resolution ISAR imaging in a Bayesian inference framework. Firstly, the probabilistic graphical model is constructed by imposing the sparsity-promoting Gamma-Gaussian prior to the distribution of scattering centers. In order to eliminate the issue of matrix inversion in conventional Sparse Bayesian Learning (SBL), a 2-D fast SBL is then proposed to improve the computational efficiency. Experimental results have demonstrated the effectiveness of the proposed method in sparse-aperture and low signal-to-noise ratio scenarios. © 2021 IEEE.

关键词： Inverse synthetic aperture radar (ISAR) sparse Bayesian learning (SBL) variational inference (VI)

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Design of an Enhanced Turbulence Detection Process Considering Aircraft Response 8th

Design of an Enhanced Turbulence Detection Process Consideri...

引用

8th International Conference on Communications, signal processing, and Systems, CSPS 2019

作者： Fan, Yuandan Lu, Xiaoguang Li, Hai Wu, Renbiao Tianjin Key Lab for Advanced Signal Processing Civil Aviation University of China Tianjin China

ISBN: (纸本)9789811394089

Turbulence is very hazardous to the flight safety, which generally can be detected by airborne weather radar. In newly specification DO-220A revised by Radio Technical Commission for Aeronautics (RTCA), standards of enhanced turbulence detection with airborne weather radar have been complemented. In the specification, it is stated that the characteristics of aircrafts should be taken into account in the turbulence detecting process. The aircraft response following a turbulence encounter is analysed in this paper, and then the characteristics of aircrafts are quantified by employing the load factor. Based on the quantified analysis, the vertical load factor is predicted based on both radar observation and the characteristics of aircraft. It can provide more accurate turbulence metrics for crews involved with different aircraft types. The simulation results demonstrate that the vertical load factor based turbulence detection process meets requirements of DO-220A. Furthermore, the research is important for the study of enhanced turbulence detection specifications documented in DO-220A. © 2020, Springer Nature Singapore Pte Ltd.

关键词： Turbulence

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