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International Conference on Audio, Language and Image Processing

作者： Pengjiang Hu Yang Liu Biao Tian Shiyou Xu Zengping Chen Science and Technology on Automatic Target Recognition Laboratory National University of Defense Technology

ISBN: (纸本)9781479939046

Fully polarimetric radar shows advantage in measuring scattering mechanisms and target scattering characteristics over single polarimetric radar. Aiming at dealing with the distortion of the target polarimetric properties caused by traditional time division between pulses (TDBP) polarimetric radar, time division in a pulse (TDIP) polarimetric radar is studied in this paper. The model of this novel polarimetric radar is established firstly. By analyzing the envelope and phase property of the intermediate frequency (IF) direct sampling echoes, pre-processing is carried out to different polarimetric channels based on the delay and the velocity measured by the narrow band. In an effort to achieving a fusion of different polarimetric channels, the translation motion is compensated jointly under the constraint of reciprocity. Pauli decomposition is employed to construct an RGB image which can describe the scattering mechanisms better. The results of simulated data prove the effectiveness of the proposed approach.

关键词： Polarimetric radar Reciprocity Joint motion compensation Fusion imaging

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A Modified Time-frequency Approach for Radar Signal Analysis Based on Spectrogram and Entropy Evaluation

A Modified Time-frequency Approach for Radar Signal Analysis...

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Progress in Electromagnetic Research Symposium

作者： Jiangwei Zou Pengjiang Hu Biao Tian Zengping Chen Science and Technology on Automatic Target Recognition Laboratory National University of Defense Technology

ISBN: (纸本)9781509060948

A modified spectrogram approach is presented for the analysis of frequency modulated radar signals, taking the entropy as the evaluation criterion. The characteristics of spectrogram are firstly introduced. After the analysis of performance evaluation for time-frequency distribution, entropy is studied as a quantitative parameter for concentration and cross-term suppression. An improved spectrogram method based on multi-window is proposed and verified by simulated data through entropy criterion.

关键词： Spectrogram RADAR SIGNALS entropy Frequency analysis evaluation criterion simulated data Performance Evaluation

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Analysis of Novel Approaches for SAR-GMTI Based on Modulated Stepped-frequency Signals

Analysis of Novel Approaches for SAR-GMTI Based on Modulated...

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Progress in Electromagnetic Research Symposium

作者： Jiangwei Zou Biao Tian Pengjiang Hu Zengping Chen Science and Technology on Automatic Target Recognition Laboratory National University of Defense Technology

ISBN: (纸本)9781509060948

SAR-GMTI is of great significance and attraction in target surveillance. Modulated stepped frequency (MSF) signal is studied in this paper as a competent choice to satisfy the cooperation of SAR and GMTI. The characteristics of SAR-GMTI and relevant signal forms are presented firstly. Several MSF based approaches are analyzed for SAR-GMTI application, including MIMO configuration, PRF transformation and compound velocity measurement.

关键词： Synthetic aperture radar Doppler effect Velocity measurement Imaging Interferometry Remote sensing Radar imaging

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Robust Adaptive Wideband Beamforming with Combined Frequency Response Invariance and Eigenvector Constraints

Robust Adaptive Wideband Beamforming with Combined Frequency...

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Progress in Electromagnetic Research Symposium

作者： Jiong Yang Yue Zhang Zengping Chen Science and Technology on Automatic Target Recognition Laboratory National University of Defense Technology

ISBN: (纸本)9781509060948

A robust beamforming scheme for the processing of wideband signals against direction of arrival (DOA) estimation errors with frequency response invariant property is proposed, where a response variation (RV) element is invoked to control the consistency of the beam-former's response over the frequency range of interest, simultaneously the eigenvector constraints are combined together to overcome the manifold errors caused by the DOA mismatch.

关键词： frequency ranges broadband Eigenvector combination frequencies Beamforming Direction of arrival estimation invariance

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target Detection Based on Phase Noise of Repeating Jamming 4

Target Detection Based on Phase Noise of Repeating Jamming

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4th International Conference on Neural Networks, Information and Communication Engineering, NNICE 2024

作者： Jiang, Hui Du, Xiaoyong Hu, Weidong Yuan, Ziqiao Xi'an Electronic Engineering Research Institute Xi'an China National University of Defense Technology National Key Laboratory of Automatic Target Recognition Changsha China

ISBN: (纸本)9798350394375

The repeating type of false target enters the radar receiver through the main lobe, realistically simulating the waveform of the real target in the time and frequency domains, posing a serious threat to radar search, recognition, and tracking. To improve the detection performance of radar in the above-mentioned interference scenarios, this paper models and analyzes the phase noise of the local oscillator of the jammer based on the phase noise difference between the jammer and the radar radio frequency (RF) system. On this basis, by establishing a statistical model for repeating jamming phase noise, utilizing the difference in phase noise between target echo and jamming signal, and based on Neyman Pearson (NP) theorem and generalized likelihood ratio tests (GLRT) method, a discriminative criterion is designed to achieve target detection in the background of interference. The effectiveness and feasibility of the algorithm are verified by Monte Carlo simulation results. © 2024 IEEE.

关键词： Phase noise

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Simulation of Space-based Observed Star Map in Space Radiation Environment

Simulation of Space-based Observed Star Map in Space Radiati...

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Progress in Electromagnetic Research Symposium

作者： Qian Zhu Zhaodong Niu Yu Duan Zengping Chen Wenzhen Wu Science and Technology on Automatic Target Recognition Laboratory National University of Defense Technology

ISBN: (纸本)9781509060948

Due to the speciality of space environment for the observation system, the observed images are interfered by space radiation noise to some extent. To improve the reality of image simulation, we propose a new method of star map simulation with space radiation effect in this paper. First of all, basic star map simulation is realized in this paper. Both star position and lightning magnitude are calculated and modeled. And point diffusion is considered. Then, with the CCD imaging theory, space radiation effects on star map are calculated and modeled. The result indicates that this method can effectually simulate the space-based observed star map in radiation environment.

关键词： extraterrestrial radiation stars simulating MAPPING(MATHEMATICAL) maps image simulation observation system Space environment Reality

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Acoustic Radar Weak target Detection Method Based on Mellin Transform

Acoustic Radar Weak Target Detection Method Based on Mellin ...

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International Conference on Computer and Information technology (CIT)

作者： Dinghe Wang Qinglong Bao Zengping Chen Science and Technology on Automatic Target Recognition Laboratory National University of Defense Technology Changsha Changsha China Science and Technology on Automatic Target Recognition Laboratory ational University of Defense Technology Changsha Changsha Hunan CN Science and Technology on Automatic Target Recognition Laboratory National University of Defense Technology Changsha Changsha Hunan CN

Acoustic radar has the advantages of low cost, high resolution, and the simplicity for sampling and storage. Recent years, it has been widely studied and applied in fields such as target detection, recognition and imaging. However, the sound signal is usually wideband. The wideband correlation function is often used in active and passive detections. To address the problems of the errors and computational burden introduced by approximation and the interpolation of signal dilation, a Mellin transform based multi-pulse weak target detection method is proposed. The method can reduce the Mellin sampling numbers and the detection result can be updated pulse by pulse.

关键词： Wideband Transforms Correlation Yttrium Conferences Computers Information technology

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Neural Network-Based Self-Interference Cancellation Method For In-Band Full-Duplex System

Neural Network-Based Self-Interference Cancellation Method F...

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IET International Radar Conference 2023, IRC 2023

作者： Zhu, HongYu Hu, WeiDong Wang, Chao Ye, Yuan Yuan, NaiChang College of Electronic Science and Technology National University of Defense Technology Changsha China National Key Laboratory of Automatic Target Recognition National University of Defense Technology Changsha China Hunan Institute of Advanced Technology Changsha China

ISBN: (纸本)9781839539954

In recent years, In-band Full-Duplex (IBFD) has garnered significant research attention in the fields of communications and sensing due to its unique ability to enhance spectral efficiency. However, the strong self-interference signals generated by the transmitter are billions of times stronger than the desired signals. The research and application of IBFD face unprecedented challenges considering radio impairments such as IQ imbalance, phase noise, Gaussian white noise, and power amplifier nonlinearity. To address this issue, this paper proposes a Multi-Domain Self-Interference Cancellation (MDSIC) method and analyzes its fundamental principles. Simulation results demonstrate that the proposed method achieves approximately 100 dB of self-interference cancellation performance. Although the simulations are based on single-input-single-output (SISO) systems, the proposed MDSIC method can be extended to phased-array or multiple-input-multiple-output (MIMO) systems. Furthermore, the self-interference cancellation performance of different neural network structures is verified using experimental data. The analysis of the experimental data confirms that the proposed MDSIC method exhibits stronger applicability in suppressing self-interference in broadband signals compared to traditional methods. © The Institution of Engineering & technology 2023.

关键词： White noise

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A New Space Radiation Suppression Algorithm for Space-Based Optical Image

A New Space Radiation Suppression Algorithm for Space-Based ...

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International Conference on Information science and Control Engineering (ICISCE)

作者： Danlu Shen Zhaodong Niu Zengping Chen Science and Technology on Automatic Target Recognition Laboratory National University of Defense Technology Changsha Hunan China Science and Technology on Automatic Target Recognition Laboratory ational University of Defense Technology Changsha Hunan China

Space-based optical images are mainly affected by space radiation, sky glow background and CCD noise interference, in which space radiation noise can seriously interfere with the subsequent target detection. In this paper, we propose a space radiation interference suppression algorithm based on multi-feature, and compare with three algorithms which are commonly used to eliminate radiation noise: a Laplacian edge detection algorithm, a fast algorithm based on histogram and a rank-ordered absolute difference (ROAD) algorithm. The experimental results show that the proposed algorithm can quickly and effectively eliminate space radiation noise.

关键词： Image segmentation Space radiation Histograms Roads Interference suppression Laplace equations

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Nonlinear optimization method of radar target polarization enhancement

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Progress in Natural science:Materials International 2000年第2期 58-62页

作者：王雪松肖顺平陶华敏庄钊文 Automatic Target Recognition Laboratory National University of Defense Technology Changsha 410073 China Institute of Command Technology Beijing 101407 China Automatic Target Recognition Laboratory National University of Defense Technology Changsha 410073 China Automatic Target Recognition Laboratory National University of Defense Technology Changsha 410073 China

On the basis of nonlinear programming model and solution of radar target polarization enhancement, a novel efficient iterative algorithm is presented. The optimization efficiency and precision are improved. The perfor... 详细信息

关键词： polarization polarization enhancement nonlinear optimization.

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