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Detection method of forward-scatter signal based on Rényi entropy

Journal of systems Engineering and electronics 2024年第4期35卷 865-873页

作者： ZHENG Yuqing AI Xiaofeng YANG Yong ZHAO Feng XIAO Shunping State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System National University of Defense TechnologyChangsha 410073China

The application scope of the forward scatter radar(FSR)based on the Global Navigation Satellite system(GNSS)can be expanded by improving the detection ***,the forward-scatter signal model when the target crosses the baseline is ***,the detection method of the for-ward-scatter signal based on the Rényi entropy of time-fre-quency distribution is proposed and the detection performance with different time-frequency distributions is ***-tion results show that the method based on the smooth pseudo Wigner-Ville distribution(SPWVD)can achieve the best ***,combined with the geometry of FSR,the influence on detection performance of the relative distance between the target and the baseline is ***,the proposed method is validated by the anechoic chamber measurements and the results show that the detection ability has a 10 dB improvement compared with the common constant false alarm rate(CFAR)detection.

关键词： forward scatter radar(FSR) Global Navigation Satellite system(GNSS) time-frequency distribution Rényi entropy signal detection

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An angular blinking jamming method based on electronically controlled corner reflectors

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Journal of systems Engineering and electronics 2024年第2期35卷 330-338页

作者： GAN Lin WU Zehao WANG Xuesong LI Jianbing State Key Laboratory of Complex Electromagnetic Environmental Effects on Electronics and Information System National University of Defense TechnologyChangsha 410073China

Passive jamming is believed to have very good potential in countermeasure *** this paper,a passive angular blinking jamming method based on electronically controlled corner reflectors is *** amplitude of the incident wave can be modulated by switching the corner reflector between the penetration state and the reflection state,and the ensemble of multiple corner reflectors with towing rope can result in complex angle decoying *** of the decoying effect on corner reflectors’radar cross section and positions are analyzed and *** show that the angle measured by a monopulse radar can be significantly interfered by this method while the automatic tracking is employed.

关键词： monopulse radar angular blinking jamming corner reflector amplitude-comparison angle measurement metasurface

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Fast measurement and prediction method for electromagnetic susceptibility of receiver

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Journal of systems Engineering and electronics 2024年第2期35卷 275-285页

作者： CHEN Yan LU Zhonghao LIU Yunxia State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System College of Electronic Science and TechnologyNational University of Defense TechnologyChangsha 410073China State Key Laboratory of Astronautic Dynamics Xi’an 710043China

Aiming at evaluating and predicting rapidly and accurately a high sensitivity receiver’s adaptability in complex electromagnetic environments,a novel testing and prediction method based on dual-channel multi-frequency is proposed to improve the traditional two-tone ***,two signal generators are used to generate signals at the radio frequency(RF)by frequency scanning,and then a rapid measurement at the intermediate frequency(IF)output port is carried out to obtain a huge amount of sample data for the subsequent ***,the IF output response data are modeled and analyzed to construct the linear and nonlinear response constraint equations in the frequency domain and prediction models in the power domain,which provide the theoretical criteria for interpreting and predicting electromagnetic susceptibility(EMS)of the *** experiment performed on a radar receiver confirms the reliability of the method proposed in this *** shows that the interference of each harmonic frequency and each order to the receiver can be identified and predicted with the sensitivity *** on this,fast and comprehensive evaluation and prediction of the receiver’s EMS in complex environment can be efficiently realized.

关键词： electromagnetic susceptibility(EMS) receiver dualchannel multi-frequency nonlinear response frequency domain power domain

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Performance analysis of multi-group three-tuple cross-eye jamming

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Journal of systems Engineering and electronics 2022年第1期33卷 80-90页

作者： CHEN Jiabei SHI Qingzhan HUANG Zhaoyu WANG Qingping YUAN Naichang State Key Laboratory of Complex Electromagnetic Environmental Effects of Electronics and Information System National University of Defense TechnologyChangsha 410000China

Monopulse radar is widely used in *** monopulse radar has always been a research hotspot in electronic warfare(EW).Cross-eye jamming has always been considered as the most effective measures to jam with monopulse *** this paper, we propose a multi-group three-tuple crosseye jamming structure where each group contains three antenna elements with a definite phase and an amplitude ***, based on the principle of monopulse angle measurement, the error angle is deduced *** show that such a multi-group three-tuple cross-eye jamming structure performs better than the multi-element cross-eye jamming structure previously proposed, and the analysis of the centroid shows that the centroid of the structure proposed in this paper is more widely distributed in space.

关键词： electronic warfare(EW) angular deception jamming cross-eye jamming three-tuple antenna array near field

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Design of Angle-stable and High-transmittance Frequency Selective Rasorber Based on Bilateral Connected Interdigital Resonator

Design of Angle-stable and High-transmittance Frequency Sele...

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2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Xu, Yixuan Shi, Tongtong Hu, Xueyi Yan, Yuchen Wu, Weiwei National University of Defense Technology State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System Changsha China

ISBN: (纸本)9798350375909

This paper presents a novel frequency selective rasorber (FSR) design with a highly transparent window. FSR is a two-dimensional periodic structure consisting of a lossless FSS layer, an air layer, and a lossy resistive thin layer. The lossless bandpass layer consists of a bimetallic square ring. It provides a bandpass response with double transmission zeros by parallel resonance. The impedance layer consists of bilaterally connected interdigital resonator (BCIR) and crossed metal wires loaded with resistors. Among them, the BCIR can produce parallel resonance. When the lossless layer coincides with the parallel resonance frequency of the lossy layer, the FSR can produce a high transmittance window. The whole structure can produce a frequency response with low-frequency absorption and high-frequency transmission. The simulation results show that the structure has almost the same response under both TM and TE polarization conditions. the reflection coefficient of the FSR in the band of 5.03-11.61 GHz under TE polarization is below -10 dB. The transmission coefficient of the FSR in the 8.57-9.73 GHz band is higher than -3 dB, where the minimum insertion loss of the transmission window can reach -0.00652 dB near 9.12 GHz. Meanwhile, the FSR has good angular stability up to 40° angle of incidence. Finally, the equivalent circuit model (ECM) of FSR is also presented. © 2024 IEEE.

关键词： Equivalent circuits

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Study on imaging quality of intrapulse intermittent modulation jamming technology based on metasurface 4

Study on imaging quality of intrapulse intermittent modulati...

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4th International Conference on Sensors and information technology, ICSI 2024

作者： Zhu, Liwen Wang, Junjie Feng, Dejun State Key Laboratory of Complex Electromagnetic Environmental Effects on Electronics and Information System National University of Defense Technology Changsha China

ISBN: (数字)9781510678699

ISBN: (纸本)9781510678682

Passive jamming technology based on metasurface is a hot topic in the field of electronic countermeasures. Currently, the existing research mainly focuses on the feasibility of false target deception from the level of jamming technologies. However, the effect of false target deception has not been given attention. For SAR jamming methods, the imaging quality of false targets will directly affect the deception effect of the image, which also determines the effectiveness of the jamming method. In this paper, a passive jamming method for intrapulse intermittent modulation by metasurface is studied. This method uses metasurface to perform intrapulse intermittent modulation of SAR-emitted radar signals. By calculating the imaging indicators such as resolution and sidelobe ratio of the pseudo-target imaging effect, the deception effect of the jamming method on the SAR system using the RD imaging processing algorithm is analyzed. As the order and intermittent modulation frequency of the false target increase, the quality indicators such as the resolution and sidelobe ratio of the false target will gradually decrease. Simulation experiments verify the correctness of the research conclusions. © 2024 SPIE.

关键词： Synthetic aperture radar

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Jamming Detection Based on Phase Feature for SAR Images

Jamming Detection Based on Phase Feature for SAR Images

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2023 International Conference on Algorithm, Imaging Processing, and Machine Vision, AIPMV 2023

作者： Zhang, Haoyu Quan, Sinong Xing, Shiqi Liu, Yitao State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System National University of Defense Technology Hunan Changsha China

ISBN: (纸本)9781510672444

Synthetic Aperture Radar (SAR) is capable of producing high-resolution complex-valued pictures, which have extensive applications in both civil and military domains. Among these applications, SAR electronic countermeasures currently represent a prominent area of research interest. Presently, within the radar electronic countermeasures, there exists a diminishing disparity among the features of real and false targets, rendering the detection of jamming increasingly challenging. This paper examines the phase of SAR images and presents a method for identifying SAR jamming regions based on phase features. The initial step involves organizing the cluttered phase information into neighborhood phase differences. Subsequently, this information is coupled with the amplitude to obtain the weighted phase difference. This metric effectively captures the extent of phase distortion resulting from jamming. The findings from the simulation experiment demonstrate that the proposed feature and method are capable of accurately identifying and filtering out the jamming region in SAR pictures. Furthermore, it demonstrates the prospection of phase within the SAR image interpretation and electronic countermeasures. © 2024 SPIE.

关键词： Synthetic aperture radar

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Analysis of spectrum spread interference pulse compression output based on stationary phase method 6

Analysis of spectrum spread interference pulse compression o...

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6th International Conference on information Science, Electrical, and Automation Engineering, ISEAE 2024

作者： Zhang, Kaiyu Wu, Qihua Zhao, Feng Zhao, Tiehua Wang, Yanfeng Liu, Xiaobin State Key Laboratory of Complex Electromagnetic Environmental Effects on Electronics and Information System National University of Defense Technology Changsha410073 China

ISBN: (纸本)9781510682924

To study the time-domain characteristics of spectrum-spread interference after matched filtering, this paper uses the stationary phase method to estimate its time-domain output. Then, the interference signal is simulated by matched filtering operation to obtain the corresponding pulse compression results, which are similar to the estimated results of the stationary phase method. The results show that the stationary phase method is a simple and effective way to analyze the pulse compression properties of spectrum-spread interference signals. © 2024 SPIE.

关键词： Matched filters

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Modelling and Analyses of the Range Gate Pull-off (RGPO) Effect on Radar Tracking

Modelling and Analyses of the Range Gate Pull-off (RGPO) Eff...

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2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Wang, Yanfeng Wu, Qihua Zhao, Tiehua Liu, Xiaobin Zhao, Feng Xiao, Shunping National University of Defense Technology State Key Laboratory of Complex Electromagnetic Environmental Effects on Electronics and Information System College of Electronic Science and Technology China

ISBN: (纸本)9798350375909

Range gate pull-off (RGPO) Jamming disrupts tracking capability of radar system by strategically increasing the latency of radar signal. Hence this kind of active deception jamming is widely adopted. The quantitative assessment and evaluation of RGPO Jamming effects on radar systems is of great significance for enhancing radar anti-jamming capabilities. However, difficulties exist in establishing a mathematical model for analyzing the jamming effects through theoretical analyses. Both the complexity of different radar systems and randomness of radar tracking processes add to this challenge. These factors result in substantial workload to analyze jamming effects. Considering these challenges, a modelling method for RGPO effects on radar based on digital simulation results is introduced in this study. Firstly, the radar range tracking model was established. Through the qualitative analyses of the process of RGPO jamming effect and the principle of affecting the tracking loop, it was found that the rate of a successful pulling off would show a precipitous drop after the pulling speed exceeds a certain threshold. This conclusion was verified in the simulation results of the RGPO effect simulation system. On this basis, to build the relationship between the maximum pull-off speed and the Jamming-to-Signal Ratio (JSR), a modelling method based on spline interpolation and least squares fitting was proposed in this study. The work contributes to a deeper understanding of the impact of RGPO Jamming on radar tracking, and provides valuable insights for bolstering radar countermeasures. © 2024 IEEE.

关键词： Radar countermeasures

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An ISAR Image Reconstruction Method via Signal Support Reweighted l1 Minimization 2

An ISAR Image Reconstruction Method via Signal Support Rewei...

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2nd IEEE International Conference on Signal, information and Data Processing, ICSIDP 2024

作者： Zhao, Tiehua Wu, Qihua Xu, Zhiming Ai, Xiaofeng Zhao, Feng Xiao, Shunping National University of Defense Technology The State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System College of Electronic Science and Technology Changsha China

ISBN: (纸本)9798331515669

The sparse aperture caused by data loss or unintentional interference is the actual problem in radar imaging process. Therefore, a compressed sensing (CS) based ISAR image reconstruction method with signal support aided is proposed in this paper. Firstly, the signal support is constructed from FFT-based imaging results. Then the signal support is introduced as a prior information into the reweighted function during the CS reconstruction. The simulation results show that, when the azimuth effective aperture ratio is as low as 30 % and signal-to-noise ratio (SNR) equals to -10 dB, the proposed method can obtain clear imaging results like that of complete aperture data. Besides, compared with the traditional CS reconstruction method, the number of false points in the reconstruction results by proposed method is greatly reduced. © 2024 IEEE.

关键词： Radar imaging

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