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| 1 | Hypersonic Vehicle Trajectory Prediction Algorithm Based on Hough Transform显示文摘Trajectory prediction is a prerequisite for missile and high-speed vehicle guidance interception.To address the trajectory problem for the near space hypersonic unpowered gliding vehicle.Firstly,the trajectory prediction mechanism is analyzed.Based on the existing NSHV trajectory prediction method,the key techniques of trajectory prediction are discussed from the perspectives of prediction parameter selection and prediction parameter description.Then,a trajectory prediction method based on Hough transform is proposed.The core of the method is to select the longitude latitude,and high direction positions as prediction parameters,and use the Hough transform to fit the prior basis functions.In the latitude and longitude direction,the rationality of predicting parameters is discussed from two aspects:position extreme point and lateral maneuverability.In the height direction,for the NSHV oscillation drop characteristic,two Hough transforms are used to separate the periodic term from the linear term.In addition,we give the approximate interval of the parameter values of the method,and design a parameter adaptive scheme.Finally,trajectory prediction is performed on two different control patterns.The error of the prediction time of 100 s is within 25 km,and the results show the effectiveness of the proposed method. | LI Fan XIONG Jiajun LAN Xuhui BI Hongkui TAN Xiansi | 2021 | Chinese Journal of Electronics2021，30，5： | 2 |
| 2 | Contour detection improved by frequency domain filtering of gradient image显示文摘We propose an intermediate computational step,frequency domain filtering of gradient image,to improve contour detection performance of gradient-based edge detectors.This step is inspired by analyzing the spectrum distribution of object contours and texture edges in the frequency domain of gradient image.We illustrate the principle and efect of this step by adding it to the Canny edge detector.The resulting operator can selectively retain object contours and region boundaries,and meanwhile can dramatically reduce non-meaningful elements caused by textured background.We use several types of images to compare the proposed method and other related methods qualitatively and quantitatively.Experimental results show that the proposed method can efectively enhance the contour detection of Canny edge detector and achieves similar detection performance to two other related methods but runs faster. | QU ZhiGuo GAO YingHui WANG Ping WANG Peng TAN XianSi SHEN ZhenKang | 2014 | Science China(Information Sciences)2014，57，1： | 2 |
| 3 | Interaction-induced topological transition in spin-orbit coupled ultracold bosons显示文摘Recent experiments in ultracold atoms have reported the realization of quantum anomalous Hall phases in spin-orbit coupled systems.Motivated by such advances,we investigate spin-orbit coupled Bose-Bose mixtures in a two-dimensional square optical Raman lattice.Complete phase diagrams are obtained via a nonperturbative real-space bosonic dynamical mean-field theory.Various quantum phases are predicted,including Mott phases with z-ferromagnetic,xy-antiferromagnetic and vortex textures,and superfluid phases with the exotic spin orders,induced by the competition between the lattice hopping and spin-orbit coupling.To explain the underlying physics in the Mott regime,an efective Hamiltonian is derived based on second-order perturbation theory,where pseudospin order stems from the interplay of efective Dzyaloshinskii-Moriya superexchange and Heisenberg interactions.In the presence of the Zeeman field,the competition of strong interaction and Zeeman energy facilitates a topological phase,which is confirmed both by the nontrivial topological Bott index and spectral function with topological edge states.Our work indicates that spin-orbit coupling can induce rich non-Abelian topological physics in strongly correlated ultracold atomic systems. | Jinsen Han Xiansi Wang Hui Tan Rui Cao Jiayu Dai Yongqiang Li Jianmin Yuan | 2023 | Science China(Physics,Mechanics & Astronomy)2023，66，9： | 0 |
| 4 | AN EFFECTIVE MODEL TO EVALUATE BLOCKING PROBABILITY OF TIME-SLOTTED OPTICAL BURST SWITCHED NETWORKS显示文摘Time-slotted optical burst switched network is a potential technique to support IP over Wavelength Division Multiplexing (WDM) by introduce Time Division Multiplexing (TDM) channel to Optical Burst Switching (OBS) technology. This paper presents a framework to evaluate blocking performance of time-slot-ted OBS networks with multi-fiber wavelength channels. The proposed model is efficient for not only single class traffic such as individual circuit switch traffics or best-effort traffics but also mixed multi-class traffics. The effectiveness of the proposed model is validated by simulation results. The study shows that blocking per-formance of multi-fiber TS-OBS network is acceptable for future Internet services. | Yang Zongkai Ou Liang Tan Xiansi | 2006 | Journal of Electronics(China)2006，23，4： | 0 |
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