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| 1 | Improved de-interleaving algorithm of radar pulses based on dual fuzzy vigilance ART显示文摘As a core part of the electronic warfare(EW) system,de-interleaving is used to separate interleaved radar signals. The de-interleaving algorithm based on the fuzzy adaptive resonance theory(fuzzy ART) is plagued by the problems of premature saturation and performance improving dilemma. This study proposes a dual fuzzy vigilance ART(DFV-ART) algorithm to address these problems and make the following improvements. Firstly, a correction method is introduced to prevent the network from prematurely saturating;then, the fuzzy vigilance models(FVM) are constructed to replace the conventional vigilance parameter, reducing the error probability in the overlapping region;finally, a dual vigilance mechanism is introduced to solve the performance improving dilemma. Simulation results show that the proposed algorithm could improve the clustering accuracy(quantization error dropped60%) and the de-interleaving performance(clustering quality increased by 10%) while suppressing the excessive proliferation of categories. | JIANG Wen FU Xiongjun CHANG Jiayun | 2020 | Journal of Systems Engineering and Electronics2020，31，2： | 4 |
| 2 | Progress of Jinping Underground laboratory for Nuclear Astrophysics(JUNA)显示文摘Jinping Underground laboratory for Nuclear Astrophysics(JUNA) will take the advantage of the ultra-low background of CJPL lab and high current accelerator based on an ECR source and a highly sensitive detector to directly study for the first time a number of crucial reactions occurring at their relevant stellar energies during the evolution of hydrostatic stars. In its first phase, JUNA aims at the direct measurements of^(25)Mg(p,γ)^(26)Al,^(19)F(p,α)^(16)O,^(13)C(α,n)^(16)O and ^(12)C(α,γ)^(16)O reactions. The experimental setup,which includes an accelerator system with high stability and high intensity, a detector system, and a shielding material with low background, will be established during the above research. The current progress of JUNA will be given. | WeiPing Liu ZhiHong Li JiangJun He XiaoDong Tang Gang Lian Zhu An JianJun Chang Han Chen QingHao Chen XiongJun Chen ZhiJun Chen BaoQun Cui XianChao Du ChangBo Fu Lin Gan Bing Guo GuoZhu He Alexander Heger SuQing Hou HanXiong Huang Ning Huang BaoLu Jia LiYang Jiang Shigeru Kubono JianMin Li KuoAng Li Tao Li YunJu Li Maria Lugaro XiaoBing Luo HongYi Ma ShaoBo Ma DongMing Mei YongZhong Qian JiuChang Qin Jie Ren YangPing Shen Jun Su LiangTing Sun WanPeng Tan Isao Tanihata Shuo Wang Peng Wang YouBao Wang Qi Wu ShiWei Xu ShengQuan Yan LiTao Yang Yao Yang XiangQing Yu Qian Yue Sheng Zeng HuanYu Zhang Hui Zhang LiYong Zhang NingTao Zhang QiWei Zhang Tao Zhang XiaoPeng Zhang XueZhen Zhang ZiMing Zhang Wei Zhao Zuo Zhao Chao Zhou | 2016 | Science China(Physics,Mechanics & Astronomy)2016，59，4： | 3 |
| 3 | Design of high-performance energy integrator detector for wideband radar显示文摘Target detection for wideband radar has recently received extensive attention. The classical energy integrating(EI)detector will always accumulate excess clutter or noise energy,which leads to unacceptable performance deterioration if the detection window is not selected properly. In this paper, an EI detector for the distributed targets in the Gaussian environment is proposed.First, at the stage of preparatory work, the target models are proposed, then, the problem formulation is introduced. Subsequently,in the aspect of optimizing the method of detection window search and the method of threshold setting, the detailed design stages of the proposed detector are provided. Furthermore, theoretical analyses show that the proposed detector is easy to hardware implementation, and it does not need the prior knowledge about the spatial distribution of the target scattering centers in practical radar detection application. Finally, the performance assessment conducted by Monte Carlo simulations verifies that the proposed detector outperforms the conventional detectors. | CHANG Jiayun FU Xiongjun JIANG Wen XIE Min | 2019 | Journal of Systems Engineering and Electronics2019，30，6： | 2 |
| 4 | Wideband radar detector based on characteristic parameters of echoes显示文摘The statistical characterization of radar range cells with the target signals is much more distinct than that of the range cells with noise-only signals.Hence,the quasi-optimal detection principle based on the characteristic parameters of echo signals is adopted to develop a detector of range-spread targets in Gaussian noise.Firstly,the characteristic parameters of the return signals in the entire range profiles of radar are investigated.Secondly,the clustering analysis of the characteristic parameter matrix is discussed to extract the test statistic of echoes.Finally,the probabilities of detection and false alarm of the proposed detector are provided.Theoretical analysis shows that the proposed detector does not need the prior knowledge about the spatial distribution of the target scattering centers in practical scenarios,and it is simple and robust even in low signal-to-noise ratio(low-SNR)scenarios.Monte Carlo(MC)simulations reveal that the detection performance of the proposed detector outperforms the conventional detectors. | CHANG Jiayun FU Xiongjun JIANG Wen XIE Min | 2019 | Journal of Systems Engineering and Electronics2019，30，5： | 1 |
| 5 | An improved de-interleaving algorithm of radar pulses based on SOFM with self-adaptive network topology显示文摘As a core part of the electronic warfare(EW) system,de-interleaving is used to separate interleaved radar signals. As interleaved radar pulses become more complex and denser, intelligent classification of radar signals has become very important. The self-organizing feature map(SOFM) is an excellent artificial neural network, which has huge advantages in intelligent classification of complex data. However, the de-interleaving process based on SOFM is faced with the problems that the initialization of the map size relies on prior information and the network topology cannot be adaptively adjusted. In this paper, an SOFM with self-adaptive network topology(SANT-SOFM) algorithm is proposed to solve the above problems. The SANT-SOFM algorithm first proposes an adaptive proliferation algorithm to adjust the map size, so that the initialization of the map size is no longer dependent on prior information but is gradually adjusted with the input data. Then,structural optimization algorithms are proposed to gradually optimize the topology of the SOFM network in the iterative process,constructing an optimal SANT. Finally, the optimized SOFM network is used for de-interleaving radar signals. Simulation results show that SANT-SOFM could get excellent performance in complex EW environments and the probability of getting the optimal map size is over 95% in the absence of priori information. | JIANG Wen FU Xiongjun CHANG Jiayun QIN Rui | 2020 | Journal of Systems Engineering and Electronics2020，31，4： | 1 |
| 6 | Corrosion and irradiation behavior of Fe-based amorphous coating in lead-bismuth eutectic liquids显示文摘Lead-bismuth eutectics (LBE) have considerable potential as a candidate material for accelerator-driven sub-critical systems(ADS).However,LBE corrosion and irradiation damage are two urgent challenges remaining to be solved for impellers of primary pumps.In this study,we have explored the possibility of using Fe-based amorphous coatings to overcome LBE corrosion and concurrently to sustain irradiation damage.Specifically,the Fe_(54)Cr_(18)Mo_(2)Zr_(8)B_(18)amorphous coating was prepared by high-velocity oxygen-fuel (HVOF) spraying on 316L steel and exposed to saturated oxygen static LBE for 500 h at 400℃.The coating with high thermal stability (T_(g)=615℃ and T_(x)=660℃) effectively prevented the substrate steel from being corroded by LBE owing to its unique long-range disordered atomic packing.The coating also exhibited strong irradiation resistance when being subjected to 45 dpa (displacement per atom) Au ion irradiation at room temperature,with no sign of crystallization even at the maximum implantation depth of 300 nm.Consequently,the hardness of the coatings before and after irradiation increased slightly.The current findings shed new insights into understanding corrosion mechanism and irradiation behavior of amorphous solids in LBE and expand the application range of amorphous materials. | LU ZhiChao PENG Xiang Yang TANG YuHai HAN ShuYin WU Yuan FU EnGang DING XiangBin HOU Shuo LU GuangYao CAO PeiPei ZHANG YiBo LIU XiongJun MA Dong WANG Hui JIANG SuiHe LU ZhaoPing | 2022 | Science China(Technological Sciences)2022，65，2： | 1 |
| 7 | Scheduling Optimization of Space Object Observations for Radar显示文摘An optimizing method of observation scheduling based on time-division multiplexing is proposed in this paper,and its efficiency is verified by outdoor experiments. The initial observation scheduling is first obtained by using a semi-random search algorithm,and secondly the connection time pair( CTP) between adjacent objects is optimized by using a genetic algorithm. After obtaining these two parameters,the final observation scheduling can be obtained. According to pre-designed tracks between each adjacent objects in observation order,the seamless observation of neighboring targets is derived by automatically steering the antenna beam,so the observation efficiency is improved. | Xiongjun Fu Liping Wu Chengyan Zhang Min Xie | 2018 | Journal of Beijing Institute of Technology2018，27，1： | 0 |
| 8 | Chaff Jamming Recognition of Radar显示文摘A modified chaff jamming recognition method of radar is investigated using grey relational analysis( GRA) based on the difference in echo correlation characteristics between a complex rigid target and chaff cloud in time domain. Slice method( SM),a novel modeling approach,is proposed to construct an electromagnetic scattering model of chaff cloud in a scenario with slowly moving platform that is targeted. The diffusion characteristics and echo characteristics of the chaff cloud are analyzed. The GRA of a real target and chaff cloud shows that the adjacent return waves have a good correlation for the target but a weak correlation for chaff cloud. Since the correlation degree of chaff cloud's echo is far lower than that of a complex rigid target's,the chaff jamming can be identified by setting a reasonable threshold. Simulation results are presented to verify the effectiveness of this method. | Min Xie Shuang Zhao Xiongjun Fu Tianyu Zhang Kaiqiang Liu | 2018 | Journal of Beijing Institute of Technology2018，27，1： | 0 |
| 9 | Micro-Doppler Parameter Estimation Method Based on Compressed Sensing显示文摘A micro-Doppler parameter estimation method based on compressed sensing theory is proposed in this paper.The micro-Doppler parameter estimation algorithm was improved for micro-motion targets with translation in this paper.Relatively ideal micro-Doppler parameter estimation results were obtained.The proposed micro-Doppler parameter estimation was compared with the traditional micro-Doppler parameter estimation algorithm.Requirements for return signal length were analyzed with this new algorithm and its performance was also analyzed in various environments with different SNR. | Jiayun Chang Xiongjun Fu Wen Jiang Min Xie | 2019 | Journal of Beijing Institute of Technology2019，28，2： | 0 |
| 10 | Theoretical Perspectives on Natural and Artificial Micro-swimmers显示文摘The observations of microorganisms revealed how they swim.As inspired by them,studies on artificial micro-robots with various actuation mechanisms have been thriving.To elucidate the essential concepts in understanding the dynamic behaviors of natural and artificial micro-swimmers—so as to control the latter in future applications,in this paper,we summarize the historical achievements and describe our theoretical perspectives.We first introduce the studies on microorganisms and their propulsion mechanisms.After reviewing the basic principles and the development of the understanding of them,we take the flagellated micro-swimmers as an example to elaborate on the theories of their locomotion.We review the progress in actuation strategies of artificial flagellated micro-swimmers and then propose two possible strategies to realize the turning of a flagellated micro-swimmer—the key step toward steerability through remote fields.Finally,we describe the inadequacies of the investigations on this topic and our perspectives on future developments. | Jinan Liu Yiqiang Fu Xiongjun Liu Haihui Ruan | 2021 | Acta Mechanica Solida Sinica2021，34，6： | 0 |
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