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| 1 | ECCM scheme against interrupted sampling repeater jammer based on time-frequency analysis显示文摘The interrupted sampling repeater jamming(ISRJ) is an effective deception jamming method for coherent radar, especially for the wideband linear frequency modulation(LFM) radar. An electronic counter-countermeasure(ECCM) scheme is proposed to remove the ISRJ-based false targets from the pulse compression result of the de-chirping radar. Through the time-frequency(TF) analysis of the radar echo signal, it can be found that the TF characteristics of the ISRJ signal are discontinuous in the pulse duration because the ISRJ jammer needs short durations to receive the radar signal. Based on the discontinuous characteristics a particular band-pass filter can be generated by two alternative approaches to retain the true target signal and suppress the ISRJ signal. The simulation results prove the validity of the proposed ECCM scheme for the ISRJ. | Shixian Gong Xizhang Wei Xiang Li | 2014 | Journal of Systems Engineering and Electronics2014，25，6： | 24 |
| 2 | Wideband electromagnetic characteristics modeling and analysis of missile targets in ballistic midcourse显示文摘The wideband electromagnetic characteristics of missile targets in midcourse are the foundation of midcourse attack-defense confrontation.This paper proposes a novel electromagnetic scattering modeling method for midcourse targets based on a precise scattering center model,in which the nonideal scattering phenomenon,shielding effect and micro-motion are taken into consideration for the first time.Firstly,a precise scattering center model incorporating both the sliding scattering and anisotropic scattering is established.Then the change rule of the target attitude is generalized,and a checking method of the scattering center shielding effect is proposed for rotationally symmetric targets.Afterwards,a novel dynamic electromagnetic scattering model is presented,where the scattering center model updates along with the variation of the target attitude and can characterize the change of the electromagnetic characteristics of midcourse targets exactly.Finally,in light of the established model,the dynamic electromagnetic characteristics within different attitude angle bounds are analyzed by stages,and some useful conclusions are obtained.Experiment results from the measured data in anechoic chamber verify the validity of the proposed modeling method and relevant analysis. | XU ShaoKun LIU JiHong WEI XiZhang LI Xiang GUO GuiRong | 2012 | Science China(Technological Sciences)2012，55，6： | 11 |
| 3 | Mathematic principle of active jamming against wideband LFM radar显示文摘The inherent mathematic principle of active jamming against the wideband linear frequency modulated(LFM) radar is investigated. According to different generation strategies, the active jamming methods are reclassified into three groups, i.e.,non-coherent jamming(NCJ), convolution jamming(CJ) and multiplying jamming(MJ). Based on the classification, the mathematic principles of different active jamming groups are put forward, which describe the relationships between the modulated signals and the jamming results. The advantages and disadvantages of different groups are further analyzed, which provides a new perspective for the study of jamming/anti-jamming methods and a potential for engineers to integrate similar jamming methods into one jammer platform. The analyses and simulation results of some typical active jamming methods prove the validity of the proposed mathematics principle. | Shixian Gong Xizhang Wei Xiang Li Yongshun Ling | 2015 | Journal of Systems Engineering and Electronics2015，26，1： | 10 |
| 4 | Parameter Estimation and Performance Analysis of Coherent Polarization Attributed Scattering Center Model显示文摘 | XU Shaokun WEI Xizhang LI Xiang GUO Guirong | 2013 | Chinese Journal of Electronics2013，22，1： | 9 |
| 5 | Tolerance analysis of multiple-element linear retrodirective cross-eye jamming显示文摘Tolerance sensitivity limits the practical application of the cross-eye jammer.Previous literature has demonstrated that retrodirective cross-eye jamming with multiple antenna elements possesses the advantage of loose tolerance requirements compared to traditional cross-eye jamming.However,the previous analysis was limited,because there are still some factors affecting the parameter tolerance of the multiple-element retrodirective cross-eye jamming(MRCJ)system and they have not been investigated completely,such as the loop difference,the baseline ratio and the jammer-to-signal ratio.This paper performs a comprehensive tolerance analysis of the MRCJ system with a nonuniformspacing linear array.Simulation results demonstrate the tolerance effects of the above influence factors and give reasonable advice for easing tolerance sensitivity. | LIU Tianpeng WEI Xizhang PENG Bo LIU Zhen SUN Bin GUAN Zhiqiang | 2020 | Journal of Systems Engineering and Electronics2020，31，3： | 7 |
| 6 | Analysis about the speckle of radar high resolution range profile显示文摘The aspect sensitivity is the main problem in radar automatic target recognition using high resolution range profile (HRRP). In the traditional viewpoint,HRRPs are assumed to be highly similar if the aspect variation is not enough to cause range migration. However,some experiments in anechoic chambers don’t agree with the assumption. Particularly,some abnormal HRRPs often occur in the measured data. Based on the scattering center model,this paper focuses on the reason of abnormal HRRP,which is named as the speckle. The theoretical model of speckle is established and the 'spurious dual peaks' feature of the speckled HRRP is analyzed. Then the occurrence condition of speckle is concluded,and so is the relationship between the speckle probability in HRRP and radar carrier frequency. At last,the experiment in an anechoic chamber is used to verify all the analyses about the speckle. | ZHANG Rui WEI XiZhang LI Xiang LIU Zhen | 2011 | Science China(Technological Sciences)2011，54，1： | 5 |
| 7 | False-target image synthesizer for countering ISAR via inverse dechirping显示文摘For real-time jamming signal generation in deceiving inverse synthetic aperture radar(ISAR),the target characteristics modulation is always processed in the expensive field programmable gate array(FPGA).Due to the large computational complexity of the traditional modulating operation,the size and structure of simulated false-target are limited.With regard to the principle of dechirping in range compression of linear frequency modulated(LFM) radar,a novel algorithm named 'inverse dechirping' is proposed for target characteristics modulation.This algorithm only needs one complex multiplier in the FPGA to generate the jamming signal when the radar signal is intercepted,which can be obtained by multiplication of radar signal samplings and the equivalent dechirped target echo in the time domain.As the complex synthesis of dechirped target echo can be realized by cheap digital signal processor(DSP) within the interpulse time,the overall cost of the jamming equipment will be reduced and the false-target size will not be limited by the scale of FPGA.Numerical simulations are performed to verify the correctness and effectiveness of the proposed algorithm. | Xizhang Wei Shaokun Xu Bo Peng Zhen Liu | 2016 | Journal of Systems Engineering and Electronics2016，27，1： | 3 |
| 8 | An Effective Integration Target Detection in Method for Moving MCPC Radar显示文摘 | DENG Bin HUO Kai WEI Xizhang LI Xiang | 2011 | Chinese Journal of Electronics2011，20，3： | 2 |
| 9 | Aliasing-free micro- Doppler analysis based on short-time compressed sensing 显示文摘 | Liu Zhen Wei Xizhang Li Xiang | 2014 | IET Signal Processing2014，8，2： | 1 |
| 10 | Dimensions estimation for cone-cylinder target based on sliding-type scatterers analysis显示文摘Scatterers often exhibit aspect or frequency dependence which affects the micro-Doppler shift in scattering response.For cone-cylinder targets, sliding-type scatterers which slide on the edge discontinuity with the change of the incident angle are the most dominant nonideal scattering models. A method is proposed to discriminate among the scatterers on the cone-cylinder target based on the deviation degree of micro-Doppler from sinusoid.By extracting the amplitude and initial phase, the micro-Doppler is estimated as sinusoid. Then the deviation degree is evaluated by the error between the extracted sinusoidal micro-Doppler and the actual micro-Doppler curve. Threshold for the classification is determined with the simulation data. After classification, the micro-Doppler features of sliding-type scatterers are exploited to estimate the target dimensions. The influence of parameters errors and noise on estimation of target dimensions is also illustrated with the simulation data. | Yuling Liu Xizhang Wei Bo Peng Yongshun Ling | 2017 | Journal of Systems Engineering and Electronics2017，28，1： | 1 |
| 11 | Narrow-band tomographic radar imaging of precession cone targets显示文摘The principle and method of the narrow-band tomo-graphic radar imaging (NBTRI) of the precession cone target are studied. Firstly, the motion model and electromagnetic scattering characteristics of the precession cone target are introduced. Secondly, based on the traditional NBTRI algorithm, a novel narrow-band tomography clean radar imaging (NBTCRI) algorithm is proposed to enhance the image quality of NBTRI results. In addition, the resolution performance of the NBTRI algorithm is analyzed. Finally, based on the ideal scattering point model, this paper discusses the relationship between the precession angle and the estimated target size from NBTRI results. By using the target's chamber data, NBTRI and NBTCRI results of the precession cone target are further analyzed, which indicates the effectiveness of the proposed method. | Xizhang Wei Shixian Gong Xiaofeng Ding | 2012 | Journal of Systems Engineering and Electronics2012，23，6： | 1 |
| 12 | Motion compensation algorithm in narrowband imaging for mid-course targets显示文摘Imaging precession targets based on the narrowband radar to distinguish the real warhead from mid-course targets is a new technique in missile defense systems. Aiming at the typical mid-course flying scene, this paper describes the principle of the narrowband imaging method, and analyzes the influence on the narrowband imaging by the target translational motion. Then the precision qualification is deduced for both the distance compensation and the velocity compensation, and the conclusion that the velocity compensation is more appropriate for the motion compensation in the narrowband imaging is given. Furthermore, this paper proposes a motion compensation algorithm for the narrowband radar which reduces the interference of the signal phase chaos caused by the rebuilt real signal phase, thus realizing the precise translational motion compensation of the narrowband signal. Finally, the effectiveness of this method is proved by both theoretic analysis and experiment results. | Xizhang Wei Zhen Liu Xiaofeng Ding Bo Peng | 2017 | Journal of Systems Engineering and Electronics2017，28，1： | 0 |
| 13 | THE INFLUENCE OF SPECKLE ON HIGH RESOLUTION RANGE PROFILE RECOGNITION BASED ON THE MATCHING SCORE显示文摘Template database is the key to radar automation target recognition based on High Resolution Range Profile (HRRP). From the traditional perspective, average HRRP is a valid template for it can represent each HRRP without scatterer Moving Through Range Cell (MTRC). However, template database based on this assumption is always challenged by measured data. One reason is that speckle happens in the frame without scatterer MTRC. Speckle makes HRRP fluctuate sharply and not match well with the average HRRP. We precisely introduce the formation mechanism of speckle. Then, we make an insight into the principle of matching score. Based on the conclusion, we study the properties of matching score between speckled HRRP and the average HRRP. The theoretical analysis and Monte Carlo experimental results demonstrate that speckle makes HRRP not to match well with the average HRRP according to the energy ratio of speckled scatterers. On the assumption of ideal scattering centre model, speckled HRRP has a matching score less than 85% with the average HRRP if speckled scatterers occupy more than 50% energy of the target. | Zhang Rui Wei Xizhang Li Xiang | 2012 | Journal of Electronics(China)2012，29，3： | 0 |
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