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Copon法与MUSIC法求解七单元线形天线波阵达方向比较研究 被引量:1
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作者 李院平 《激光杂志》 CAS CSCD 北大核心 2014年第2期24-25,共2页
基于Copon法与MUSIC法求解七单元线形天线波阵达方向,数值计算得到在π6、2π3、5π6和π3处都有尖锐的方向图线,并且MUSIC法作出的波达方向估计(极坐标和直角坐标)响应的幅度更大一些。改变四个方向入射频率值的大小,发现波阵达方向响... 基于Copon法与MUSIC法求解七单元线形天线波阵达方向,数值计算得到在π6、2π3、5π6和π3处都有尖锐的方向图线,并且MUSIC法作出的波达方向估计(极坐标和直角坐标)响应的幅度更大一些。改变四个方向入射频率值的大小,发现波阵达方向响应幅度变化不大。研究研究结论天线器件设计提供理论依据。 展开更多
关键词 Copon法 MUSIC法 七单元线形天线波 阵达方向
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未知噪声背景的参考阵元DOA矩阵法
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作者 吴湘霖 俞卞章 《弹箭与制导学报》 CSCD 北大核心 2008年第6期226-230,共5页
文中提出了一种有效的参考阵元(Referential-Sensor)波达方向矩阵法,解决了未知相关噪声环境二维波达方向、信号频率等三维参数联合估计的问题。与现有算法相比较,RSDOA方法对于系统的硬件需求大为下降,计算负担小;由于无阵列孔径损失... 文中提出了一种有效的参考阵元(Referential-Sensor)波达方向矩阵法,解决了未知相关噪声环境二维波达方向、信号频率等三维参数联合估计的问题。与现有算法相比较,RSDOA方法对于系统的硬件需求大为下降,计算负担小;由于无阵列孔径损失问题且空时协方差矢量具有时域平滑效果,因此参数估计性能优越,具有广泛的适用性与实际的应用价值。理论分析与仿真实验都证实了这一结论。 展开更多
关键词 未知噪声 二维波方向 频率 联合估计 参考元波方向
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Computationally Efficient 2DDOA Estimation for Uniform Planar Arrays:RDROOTMUSIC Algorithm 被引量:3
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作者 YE Changbo ZHU Beizuo +1 位作者 LI Baobao ZHANG Xiaofei 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2021年第4期685-694,共10页
The problem of two-dimensional direction of arrival(2D-DOA)estimation for uniform planar arrays(UPAs)is investigated by employing the reduced-dimensional(RD)polynomial root finding technique and 2D multiple signal cla... The problem of two-dimensional direction of arrival(2D-DOA)estimation for uniform planar arrays(UPAs)is investigated by employing the reduced-dimensional(RD)polynomial root finding technique and 2D multiple signal classification(2D-MUSIC)algorithm.Specifically,based on the relationship between the noise subspace and steering vectors,we first construct 2D root polynomial for 2D-DOA estimates and then prove that the 2D polynomial function has infinitely many solutions.In particular,we propose a computationally efficient algorithm,termed RD-ROOT-MUSIC algorithm,to obtain the true solutions corresponding to targets by RD technique,where the 2D root-finding problem is substituted by two one-dimensional(1D)root-finding operations.Finally,accurate 2DDOA estimates can be obtained by a sample pairing approach.In addition,numerical simulation results are given to corroborate the advantages of the proposed algorithm. 展开更多
关键词 uniform planar array(UPA) direction of arrival(DOA)estimation RD-ROOT-MUSIC algorithm
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Blind Joint DOA and Polarization Estimation for Polarization Sensitive Coprime Planar Arrays via a Fast-Convergence Quadrilinear Decomposition Approach
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作者 XU Xiong SHEN Jinqing +1 位作者 ZHU Beizuo ZHANG Xiaofei 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2020年第5期778-786,共9页
The problem of joint direction of arrival(DOA)and polarization estimation for polarization sensitive coprime planar arrays(PS-CPAs)is investigated,and a fast-convergence quadrilinear decomposition approach is proposed... The problem of joint direction of arrival(DOA)and polarization estimation for polarization sensitive coprime planar arrays(PS-CPAs)is investigated,and a fast-convergence quadrilinear decomposition approach is proposed.Specifically,we first decompose the PS-CPA into two sparse polarization sensitive uniform planar subarrays and employ propagator method(PM)to construct the initial steering matrices separately.Then we arrange the received signals into two quadrilinear models so that the potential DOA and polarization estimates can be attained via quadrilinear alternating least square(QALS).Subsequently,we distinguish the true DOA estimates from the approximate intersecting estimations of the two subarrays in view of the coprime feature.Finally,the polarization estimates paired with DOA can be obtained.In contrast to the conventional QALS algorithm,the proposed approach can remarkably reduce the computational complexity without degrading the estimation performance.Simulations demonstrate the superiority of the proposed fast-convergence approach for PS-CPAs. 展开更多
关键词 polarization sensitive arrays coprime planar arrays direction of arrival(DOA)estimation polarization estimation quadrilinear decomposition fast convergence
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Min-norm spatial spectrum based on acoustic vector-sensor linear array 被引量:2
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作者 ZHANG Lan-yue YANG De-sen 《Journal of Marine Science and Application》 2006年第3期41-45,共5页
The high resolution of DOA(direction of arrival) estimation could be obtained by using the min-norm algorithm. In this paper, the expression of the min-norm spatial spectrum based on acoustic vector-sensor(AVS) li... The high resolution of DOA(direction of arrival) estimation could be obtained by using the min-norm algorithm. In this paper, the expression of the min-norm spatial spectrum based on acoustic vector-sensor(AVS) linear arrays was presented and simulation study was carried out. Results of simulations indicated that left/right ambiguity could be removed and better performance for DOA estimation was obtainable when dealing with sources close to endfire than using pressure hydrophone linear arrays, and the interelement spacing was allowed to exceed the half-wavelength upper limit. A three-element vector hydrophone linear array with two meters interspace was designed. The AVS experiment was carried out at Songhua Lake in Jinlin Province. Experimental results show a high resolution tracking of targets can be obtained using the rain-norm algorithm. 展开更多
关键词 acoustic vector-sensor linear array min-norm algorithm direction of arrival estimation
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Two-dimensional DOA estimation based on thin array towed by a small autonomous platform
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作者 JIANG Jiajia YANG Guoliang +5 位作者 LI Chunyue LI Yao WANG Xianquan SUN Zhongbo DUAN Fajie FU Xiao 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2021年第3期258-266,共9页
The small autonomous platform with a thin line array is an important tool for underwater acoustic mobile surveillance.Generally,only one-dimensional(1-D)direction-of-arrival(DOA)of the source signal can be estimated u... The small autonomous platform with a thin line array is an important tool for underwater acoustic mobile surveillance.Generally,only one-dimensional(1-D)direction-of-arrival(DOA)of the source signal can be estimated using a thin towed line array.In this work,the two-dimensional(2-D)DOA estimation is achieved by the thin line array towed by a small autonomous platform due to its flexible maneuver.Two perpendicular tow paths are formed through the fast turning of this array.An L-shaped array is formed by the same towed array on these two tow paths at different times.Using the array on these two straight paths,two 1-D DOAs of the source signal are obtained respectively,and then the 2-D DOA based on the formed L-shaped array can be estimated.The effectiveness of proposed approach is verified by numerical simulations and its theoretical error is analyzed. 展开更多
关键词 towed line array autonomous platform direction-of-arrival(DOA) underwater signal passive sonar
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Robust generalized sidelobe canceller based on eigenanalysis and a MaxSINR beamformer 被引量:2
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作者 Quan-dong WANG Liang-hao GUO +2 位作者 Wei-yu ZHANG Sui-ling REN Chao YAN 《Frontiers of Information Technology & Electronic Engineering》 SCIE EI CSCD 2019年第7期975-988,共14页
A robust generalized sidelobe canceller is proposed to combat direction of arrival(DOA)mismatches.To estimate the interference-plus-noise(IPN)statistics characteristics,conventional signal of interest(SOI)extraction m... A robust generalized sidelobe canceller is proposed to combat direction of arrival(DOA)mismatches.To estimate the interference-plus-noise(IPN)statistics characteristics,conventional signal of interest(SOI)extraction methods usually collect a large number of segments where only the IPN signal is active.To avoid that collection procedure,we redesign the blocking matrix structure using an eigenanalysis method to reconstruct the IPN covariance matrix from the samples.Additionally,a modified eigenanalysis reconstruction method based on the rank-one matrix assumption is proposed to achieve a higher reconstruction accuracy.The blocking matrix is obtained by incorporating the effective reconstruction into the maximum signal-to-interferenceplus-noise ratio(MaxSINR)beamformer.It can minimize the influence of signal leakage and maximize the IPN power for further noise and interference suppression.Numerical results show that the two proposed methods achieve considerable improvements in terms of the output waveform SINR and correlation coefficients with the desired signal in the presence of a DOA mismatch and a limited number of snapshots.Compared to the first proposed method,the modified one can reduce the signal distortion even further. 展开更多
关键词 EIGENANALYSIS Interference-plus-noise covariance matrix reconstruction Maximum signal-to-interference-plus-noise ratio criterion Blocking matrix Generalized sidelobe canceller Direction of arrival mismatch
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