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Polygon search algorithm for ultra-compact multifunctional integrated photonics design

Photonics Research 2024年第7期12卷 1527-1541页

作者： TE DU ZHENG PENG PEIXIN HUANG zhaojian zhang HANSI MA XINPENG JIANG JIE HUANG MINGYU LUO HONGXIN ZOU JUNBO YANG Center of Material Science College of ScienceNational University of Defense TechnologyChangsha 410073China Institute for Quantum Science and Technology College of ScienceNational University of Defense TechnologyChangsha 410073China College of Computer National University of Defense TechnologyChangsha 410073China College of Systems Engineering National University of Defense TechnologyChangsha 410073China Defense Innovation Institute Academy of Military SciencesBeijing 100071China Photonics Research Institute Department of Electrical and Electronic EngineeringThe Hong Kong Polytechnic UniversityHong Kong 999077China Hunan Key Laboratory of Mechanism and Technology of Quantum Information Changsha 410073China

Ultra-compact multifunctional integrated photonic modules have great practical significance to photonic integrated circuits (PICs).However,the design effect and efficiency of the existing mainstream inverse design algorithms are incompetent when designing these *** analyze their shortcomings in this task,and propose a new,to our knowledge,inverse design algorithm named polygon search (PS) algorithm to address these *** utilize the PS algorithm to design an integrated dual-channel mode-conversion-crossing waveguide *** module integrates three functions:interconversion between TE_(0) and TE_(1),interconversion between TE_(0) and TE_(2),and channel crossing within only a 4μm×4μm footprint,and its performance is verified by experimental *** not only greatly reduces the total footprint of many PICs but also greatly improves their fabricating ***,we propose a PS-designed mode mixer and a PS-designed bending waveguide,and connect them with the integrated modules to form a four-channel crossing-mode-division-multiplexing *** system can provide multiple modes on the basis of channel crossing and transmit the output signal in the same direction in parallel within a single output waveguide,which significantly increases the communication bandwidth and decreases the footprint of *** last,we demonstrate the effect and efficiency advantages of the PS algorithm over several mainstream inverse design algorithms by a comprehensive contrast experiment and explain these advantages in theory from several perspectives.

关键词： waveguide mixer algorithm

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Antenna selection in MIMO radar with collocated antennas

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Journal of Systems Engineering and Electronics 2019年第6期30卷 1119-1131页

作者： zhang Haowei XIE Junwei SHI Junpeng zhang zhaojian Air and Missile Defense College Air Force Engineering UniversityXi’an 710051China Electromagnetic Countermeasure College National University of Defense TechnologyHefei 230031China Air Force Early Warning Academy of the PLA Wuhan 410039China

An antenna adjustment strategy is developed for the target tracking problem in the collocated multiple-input multipleoutput(MIMO)*** basic technique of this strategy is to optimally allocate antennas by the prior information in the tracking recursive period,with the objective of enhancing the worst-case estimate precision of multiple *** account of the posterior Cramer-Rao lower bound(PCRLB)offering a quantitative measure for target tracking accuracy,the PCRLB of joint direction-of-arrival(DOA)and Doppler is derived and utilized as the optimization *** is shown that the dynamic antenna selection problem is NP-hard,and an efficient technique which combines convex relaxation with local search is put forward as the *** results demonstrate the outperformance of the proposed strategy to the fixed antenna configuration and heuristic search ***,it is able to offer close-to performance of the exhaustive search method.

关键词： collocated multiple-input multiple-output(MIMO)radar multi-target tracking antenna selection posterior Cramer Rao lower bound(PCRLB) direction-of-arrival(DOA).

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Topological multipolar corner state in a supercell metasurface and its interplay with two-dimensional materials

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Photonics Research 2022年第4期10卷 855-869页

作者： zhaojian zhang Junbo Yang Te Du Xinpeng Jiang College of Liberal Arts and Sciences National University of Defense TechnologyChangsha 410073China Center of Material Science National University of Defense TechnologyChangsha 410073China

Second-order topological insulators(SOTIs) have recently attracted much attention due to their capability to support lower-dimensional topological states, namely, the corner states. Here, we demonstrate that properly designed supercell metasurfaces can support photonic corner states, meanwhile further serving as an ideal platform for the implementations of topological polaritons and dynamically reconfigurable corner states by assembling two-dimensional materials. Such metasurfaces consist of an array of finite-sized SOTIs mimicking the twodimensional Su–Schrieffer–Heeger model. We reveal that the topological transition happens in unit cells without the bandgap, and nondegenerate multipolar corner states emerge in the supercell metasurface due to the inter-and intrasupercell coupling effects. Especially since these corner states are above the light line of the metasurface, we realize the collective stimulation of the two dipolar corner states and their superposition state via far-field excitation. By stacking monolayer hexagonal boron nitride film onto the metasurface, we further achieve the topological phonon polaritons through the strong coupling between the corner state and the phonon, which is confirmed by the Rabi splitting as well as anticrossing behavior emerging in the transmission ***, we reveal the robustness of the corner state and strong coupling by introducing defects into the metasurface. Finally, tunable corner state and strong coupling with on-demand control are realized by assembling monolayer graphene onto the metasurface. Our theoretical study proposes a unique hybrid-material platform for topological polaritonics and reconfigurable topological photonics, which can promote large-area topological applications in practice.

关键词： polar while corner

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Variable scheduling interval task scheduling for phased array radar

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Journal of Systems Engineering and Electronics 2018年第5期29卷 937-946页

作者： zhang Haowei XIE Junwei zhang zhaojian SHAO Lei CHEN Tangjun Air and Missile Defense College Air Force Engineering UniversityXi’an 710051China Air Force Early Warning Academy Wuhan 410039China Unit 94921 of the PLA Jinjiang 362200China

A scheduling algorithm is presented aiming at the task scheduling problem in the phased array radar. Rather than assuming the scheduling interval(SI) time, which is the update interval of the radar invoking the scheduling algorithm, to be a fixed value,it is modeled as a fuzzy set to improve the scheduling *** scheduling algorithm exploits the fuzzy set model in order to intelligently adjust the SI time. The idle time in other SIs is provided for SIs which will be overload. Thereby more request tasks can be accommodated. The simulation results show that the proposed algorithm improves the successful scheduling ratio by 16%,the threat ratio of execution by 16% and the time utilization ratio by 15% compared with the highest task mode priority first(HPF)algorithm.

关键词： phased array radar task scheduling variable scheduling interval(SI) fuzzy set

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一种慢时间维的密集假目标干扰主瓣匿影算法

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兵工学报 2024年第2期45卷 606-617页

作者：张亮杜庆磊张昭建王永良空军预警学院预警技术系湖北武汉430019 94326部队山东济南250000

受干扰机对雷达脉冲重复频率、波束扫描周期测量精度影响,密集假目标干扰在回波中的慢时间分布与目标不同。针对该差异,提出一种慢时间维的密集假目标干扰主瓣匿影(Main-Lobe Blanking,MLB)算法。该算法与副瓣匿影(Side-Lobe Blanking,S... 详细信息

受干扰机对雷达脉冲重复频率、波束扫描周期测量精度影响,密集假目标干扰在回波中的慢时间分布与目标不同。针对该差异,提出一种慢时间维的密集假目标干扰主瓣匿影(Main-Lobe Blanking,MLB)算法。该算法与副瓣匿影(Side-Lobe Blanking,SLB)具有一定相似性,区别在于SLB是利用辅助通道回波,对主通道回波沿快时间进行选通,而所提MLB算法是利用主通道内的多个脉冲重复周期回波,对各距离单元回波沿慢时间进行选通。仿真与实测数据表明,所提方法可有效抑制主瓣或副瓣进入的密集假目标干扰。

关键词：雷达密集假目标干扰慢时间主瓣匿影实测数据

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Finite sensor selection algorithm in distributed MIMO radar for joint target tracking and detection

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Journal of Systems Engineering and Electronics 2020年第2期31卷 290-302页

作者： zhang Haowei XIE Junwei GE Jiaang zhang zhaojian LU Wenlong Air and Missile Defense College Air Force Engineering UniversityXi’an 710051China Air Force Early Warning Academy of the PLA Wuhan 410039China Unit 95899 of the PLA Beijing 100085China

Due to the requirement of anti-interception and the limitation of processing capability of the fusion center, the subarray selection is very important for the distributed multiple-input multiple-output(MIMO) radar system, especially in the hostile environment. In such conditions, an efficient subarray selection strategy is proposed for MIMO radar performing tasks of target tracking and detection. The goal of the proposed strategy is to minimize the worst-case predicted posterior Cramer-Rao lower bound(PCRLB) while maximizing the detection probability for a certain region. It is shown that the subarray selection problem is NP-hard, and a modified particle swarm optimization(MPSO) algorithm is developed as the solution strategy. A large number of simulations verify that the MPSO can provide close performance to the exhaustive search(ES) algorithm. Furthermore, the MPSO has the advantages of simpler structure and lower computational complexity than the multi-start local search algorithm.

关键词： distributed multiple-input multiple-output(MIMO)radar subarray selection target tracking target detection particle swarm optimization(PSO)

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Pulse interleaving scheduling algorithm for digital array radar

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Journal of Systems Engineering and Electronics 2018年第1期29卷 67-73页

作者： zhang Haowei XIE Junwei zhang zhaojian ZONG Binfeng SHENG Chuan Air and Missile Defense College Air Force Engineering UniversityXi’an 710051China Unit 94710 of the PLA Wuxi 214000China

An online pulse interleaving scheduling algorithm is proposed for a solution to the task scheduling problem in the digital array radar(DAR). The full DAR task structure is explicitly considered in a way that the waiting duration is able to be utilized to transmit or receive subtasks, namely the pulse interleaving,as well as the receiving durations of different tasks are able to be overlapped. The algorithm decomposes the pulse interleaving scheduling analysis into the time constraint check and the energy constraint check, and schedules online all kinds of tasks that are able to be interleaved. Thereby the waiting duration and the receiving duration in the DAR task are both fully utilized. The simulation results verify the performance improvement and the high efficiency of the proposed algorithm compared with the existing ones.

关键词： digital array radar(DAR) task scheduling pulse interleaving

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Hybrid Particle Swarm Optimization Algorithm Based on Entropy Theory for Solving DAR Scheduling Problem

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Tsinghua Science and Technology 2019年第3期24卷 281-290页

作者： Haowei zhang Junwei Xie Jiaang Ge Junpeng Shi zhaojian zhang Air and Missile Defense College Air Force Engineering University National University of Defense Technology (NUDT) Air Force Early Warning Academy of PLA

An efficient task-scheduling algorithm in the Digital Array Radar(DAR) is essential to ensure that it can handle a large number of requested tasks simultaneously. As a solution to this problem, in this paper, we propose an optimization model for scheduling DAR tasks using a hybrid approach. The optimization model considers the internal task structure and the DAR task-scheduling characteristic. The hybrid approach integrates a particle swarm optimization algorithm with a genetic algorithm and a heuristic task-interleaving algorithm. We introduce the chaos theory to optimize initialized particles and use entropy theory to indicate the diversity of particles and adaptively adjust the inertia weight, the crossover probability, and the mutation probability. Then, we improve both the efficiency and global exploration ability of the hybrid algorithm. In the framework of the swarm exploration algorithm, we include a heuristic task-interleaving scheduling algorithm, which not only utilizes the wait interval to transmit or receive subtasks, but also overlaps the receive intervals of different tasks. In a large-scale simulation,we demonstrate that the proposed algorithm is more robust and effective than existing algorithms.

关键词： digital array radar task scheduling particle swarm optimization

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Ultra-compact broadband polarization beam splitter with strong expansibility

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Photonics Research 2018年第6期6卷 574-578页

作者： JIE HUANG JUNBO YANG DINGBO CHEN XIN HE YUNXIN HAN JINGJING zhang zhaojian zhang Center of Material Science National University of Defense Technology China State Key Laboratory on Advanced Optical Communication Systems and Networks Peking University

Based on the traditional directional coupler, we proposed a scheme to design on-chip polarization beam splitters using an inverse design method. In our scheme, the coupling area of the designed devices are only 0.48 μm× 6.4 μm. By manipulating the refractive index of the coupling region, the devices can work in C-band,L-band, O-band, or any other communication band. Different from conventional design methods, which need to adjust the design parameters artificially, if the initial conditions are determined, the proposed scheme can automatically adjust the design parameters of devices according to specific requirements. The simulation results show that the insertion losses of the designed polarization beam splitters can be less than 0.4 dB(0.35 dB) for TE(TM)mode at the wavelengths of 1310, 1550, and 1600 nm, and the extinction ratios are larger than 19.9 dB for the TE and TM modes at all three wavelengths. Besides, the extinction ratios of both polarization states are more than 14.5 dB within the wavelength range of 1286–1364 nm, 1497–1568 nm, and 1553–1634 nm. At the same time,the insertion losses are smaller than 0.46 dB.

关键词： Mathematical methods in physics Polarization-selective devices Subwavelengthstructures Integrated optics devices

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Suppression of dense false target jamming for stepped frequency radar in slow time domain

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Science China(Information Sciences) 2022年第3期65卷 283-285页

作者： Li ZENG zhaojian zhang Yong-Liang WANG Weijian LIU Hui CHEN Bilei ZHOU Electronic Information School Wuhan University Wuhan Electronic Information Institute

Dear editor,The presence of jamming can drastically degrade the detection performance of a radar system [1]. Dense false target jamming is a paramount type of deceptive jamming, which is employed to counter pulse compression radar [2]. The jamming signal is obtained by storing and transmitting the radiated signal, and it produces a large number of false targets that are similar to target signals at the radar receiver [3].

关键词： stepped frequency dense false target jamming coherent accumulation slow time domain matched filtering

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