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| 1 | Effect of cold rolling process on microstructure and mechanical properties of high strength β titanium alloy thin sheets显示文摘The microstructure and mechanical properties of Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe high strength titanium alloy sheets prepared by unidirectional cold rolling and two-step cross cold rolling were investigated. Results showed that the β phase grains were refined significantly by cold rolling followed by solution treatment for a short time.Compared to unidirectional cold rolling, the short time solution treatment after two-step cross rolling could significantly reduce the non-uniformity of the microstructure of the alloy sheets. After aging treatment at 550 ℃,the anisotropy of the mechanical properties still existed in the unidirectional rolled sheets, and the tensile strength was highest along the rolling direction. After solution and aging treatment, the anisotropy of the mechanical properties of the two-step cross rolling process sheet was not obvious than unidirectional cold rolling,and alloy had good strength and plasticity matching. | Yan Ma Zhaoxin Du Xiaoming Cui Jun Cheng Guolong Liu Tianhao Gong Huimin Liu Xiaopeng Wang Yuyong Chen | 2018 | Progress in Natural Science:Materials International2018，28，6： | 6 |
| 2 | Adaptive detector design of MIMO radar with unknown covariance matrix显示文摘The problem of detecting signal with multiple input mul-tiple output (MIMO) radar in correlated Gaussian clutter dominated scenario with unknown covariance matrix is dealt with. The gen-eral MIMO model, with widely separated sub-arrays and co-located antennas at each sub-array, is adopted. Firstly, the generalized likelihood ratio test (GLRT) with known covariance matrix is ob-tained, and then the Rao and Wald detectors are devised, which have proved that the Rao and Wald test coincide with GLRT detec-tor. To make the detectors fully adaptive, the secondary data with signal-free will be collected to estimate the covariance. The per-formance of the proposed detector is analyzed, however, it is just ancillary. A thorough performance assessment by several numer-ical examples is also given, which has considered the sense with co-located antennas configure of transmitters and receivers array. The results show that the performance the proposed adaptive de-tector is better than LJ-GLRT, and the loss can be acceptable in comparison to their non-adaptive counterparts. | Lingjiang Kong Guolong Cui Xiaobo Yang Jianyu Yang | 2010 | Journal of Systems Engineering and Electronics2010，21，6： | 1 |
| 3 | Super-resolution processing of passive millimeter-wave images based on conjugate-gradient algorithm显示文摘This paper designs a 3 mm radiometer and validate with experiments based on the principle of passive millimeter wave(PMMW) imaging.The poor spatial resolution,which is limited by antenna size,should be improved by post data processing.A conjugate-gradient(CG) algorithm is adopted to circumvent this drawback.Simulation and real data collected in laboratory environment are given,and the results show that the CG algorithm improves the spatial resolution and convergent rate.Further,it can reduce the ringing effects which are caused by regularizing the image restoration.Thus,the CG algorithm is easily implemented for PMMW imaging. | Li Liangchao Yang Jianyu Cui Guolong Wu Junjie Jiang Zhengmao Zheng Xin | 2009 | Journal of Systems Engineering and Electronics2009，20，4： | 1 |
| 4 | Track-beforedetectstrategies for range distributed target detection incompound-Gaussianclutter显示文摘 | JIANG Haichao YI Wei CUI Guolong | 2016 | SignalProcessing2016，120，： | 1 |
| 5 | Grating lobes analysis based on blazed grating theory for liquid crystal optical phased array 显示文摘 | Chen Jian Cui Guolong Kong Lingjiang | 2013 | Optical Engineering2013，52，09： | 1 |
| 6 | Dual-Use Signal Design for Radar and Communication via Joint Orthogonal Signal and Phase Modulation显示文摘This paper proposes a new information modulation resorting to orthogonal signal and its phase for dual-function radar communication(DFRC)systems.Focusing on the standardized linear frequency modulation(LFM)signal by additional phase,a bank of signals enjoying satisfactory autocorrelation and cross-correlation characteristics,are generated.Then,these signals map the different information as well as their phases are also modulated to increase the communication bit rate,thus yielding a series of dual-use signals.Finally,the radar detection and communication performance of dual-use signals are also provided through numerical simulation and half-physical platform verification,confirming the effectiveness of the designed signals compared with the existing design strategy. | Yu Lin Yi Bu Hui Qiu Xue Yao Xianxiang Yu Guolong Cui | 2021 | Journal of Beijing Institute of Technology2021，30，1： | 1 |
| 7 | Constant modulus sequence set design with low weighted integrated sidelobe level in spectrally crowded environments显示文摘Dear editor,Radar waveform design with desired correlation properties has received considerable attention because of its performance improvement in the detection of a weak target[1,2].Moreover,owing to the increasing demand for access a wide radio frequency spectrum,coexistence among radar and telecommunication systems are currently instrumental in solving the spectrum-congestion problem[2].Based on spectrum sensing in cognitive radar[3],several approaches have been developed[4,5]to form radar signals with an appropriate frequency allocation,while minimizing its autocorrelation sidelobes.However,these studies have only focused on the single waveform design and did not consider the limitation of the available number of bits in the digital signal generators,likely resulting in performance deterioration. | Yi BU Hui QIU Tao FAN Xianxiang YU Guolong CUI Lingjiang KONG | 2022 | Science China(Information Sciences)2022，65，5： | 0 |
| 8 | Scale effect removal and range migration correction for hypersonic target coherent detection显示文摘The detection of hypersonic targets usually confronts range migration(RM)issue before coherent integration(CI).The traditional methods aiming at correcting RM to obtain CI mainly considers the narrow-band radar condition.However,with the increasing requirement of far-range detection,the time bandwidth product,which is corresponding to radar’s mean power,should be promoted in actual application.Thus,the echo signal generates the scale effect(SE)at large time bandwidth product situation,influencing the intra and inter pulse integration performance.To eliminate SE and correct RM,this paper proposes an effective algorithm,i.e.,scaled location rotation transform(ScLRT).The ScLRT can remove SE to obtain the matching pulse compression(PC)as well as correct RM to complete CI via the location rotation transform,being implemented by seeking the actual rotation angle.Compared to the traditional coherent detection algorithms,Sc LRT can address the SE problem to achieve better detection/estimation capabilities.At last,this paper gives several simulations to assess the viability of ScLRT. | WU Shang SUN Zhi JIANG Xingtao ZHANG Haonan DENG Jiangyun LI Xiaolong CUI Guolong | 2024 | Journal of Systems Engineering and Electronics2024，35，1： | 0 |
| 9 | A New Transmit Beamforming Method for Multi-User Communication in Dual-Function Radar-Communication显示文摘This paper develops a new transmit beamforming for an integrated mechanical and electrical scanning dual-function radar-communication(DFRC)system.Differing from the related some works using beampattern sidelobe level to communication,we exploit the fact that transmit beamforming weight vector u k in directionθand weight vector u*k in direction-θcan achieve the same spatial power distribution,and formulate a new transmit beamforming vector design problem accounting for some extra sidelobe level constraints.By doing so,the number of the transmit beamforming weight vectors and the computing demand in the multi-user communication(MUC)scenario can be reduced.Finally,the numerical examples are designed to verify the effectiveness of the proposed design strategy in comparison with the existing method. | Xue Yao Yu Liu Zaichen Zhang Xianxiang Yu Guolong Cui | 2021 | Journal of Beijing Institute of Technology2021，30，1： | 0 |
| 10 | Signal design for MIMO dual-function systems with permutation learning显示文摘This paper addresses the signal matrix synthesis in the multi-input-multi-output(MIMO)dualfunction system aimed at obtaining the desired radar beampattern while embedding communication symbols into the permutation matrix of each pulse.To this end,transmit beampattern peak mainlobe to sidelobe level ratio(PMSR)is considered the figure of merit.Besides,the phases of the codebook induced by the designed weight vectors impinged on the directions of the communication receivers and eavesdroppers are restricted to be uniformly distributed and totally the same,respectively.To handle the resulting design problem,an iterative algorithm is devised to account for the coupled quadratic fractional programming objective function with multi-equality constraints,capitalizing on the alternating direction method of multipliers(ADMM)framework.As to the demodulation process for permutation learning,a novel algorithm based on the alternating direction penalty method(ADPM)framework is proposed to handle the mix-boolean optimization problem with the correlation between the communication dictionary and permutation of the received filtered data maximized.Finally,numerical results highlight the effectiveness of the conceived algorithms in comparison with the existing counterparts. | Jing YANG Xianxiang YU Minghui SHA Wen FAN Guolong CUI | 2023 | Science China(Information Sciences)2023，66，10： | 0 |
| 11 | MICRO-MOTION TARGET SENSING BY STEPPED-FREQUENCY CONTINUOUS-WAVE RADAR显示文摘Mechanical micro-vibration of a target may induce phase modulations on the radar echo,and the vibration can be detected to identify micro-motion target. In this paper,a new method to detect a micro-motion target and obtain its range and micro-motion frequency is proposed in which multiple periods stepped-frequency continuous-wave signal and Moving Target Indication (MTI) filter are adopted. The simulation results illustrate the validity of this method and present the detection of the target range and the vibration frequency. The experiment gives promising results. | Kong Lingjiang Zhou Yongshun Cui Guolong Yang Jianyu | 2009 | Journal of Electronics(China)2009，26，6： | 0 |
| 12 | Non-LOS target localization via millimeter-wave automotive radar显示文摘This paper considers the non-line-of-sight(NLOS)vehicle localization problem by using millimeter-wave(MMW)automotive radar.Several preliminary attempts for NLOS vehicle detection are carried out and achieve good results.Firstly,an electromagnetic(EM)wave NLOS multipath propagation model for vehicle scene is established.Subsequently,with the help of available multipath echoes,a complete NLOS vehicle localiza-tion algorithm is proposed.Finally,simulation and experimental results validate the effectiveness of the established EM wave propagation model and the proposed NLOS vehicle localization algorithm. | LIU Zhaoyu ZHANG Wenli ZHENG Jingyue GUO Shisheng CUI Guolong KONG Lingjiang LIANG Kun | 2023 | Journal of Systems Engineering and Electronics2023，34，5： | 0 |
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