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Automatic recognition of sonar targets using feature selection in micro-Doppler signature 被引量:1
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作者 Abbas Saffari Seyed-Hamid Zahiri Mohammad Khishe 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2023年第2期58-71,共14页
Currently,the use of intelligent systems for the automatic recognition of targets in the fields of defence and military has increased significantly.The primary advantage of these systems is that they do not need human... Currently,the use of intelligent systems for the automatic recognition of targets in the fields of defence and military has increased significantly.The primary advantage of these systems is that they do not need human participation in target recognition processes.This paper uses the particle swarm optimization(PSO)algorithm to select the optimal features in the micro-Doppler signature of sonar targets.The microDoppler effect is referred to amplitude/phase modulation on the received signal by rotating parts of a target such as propellers.Since different targets'geometric and physical properties are not the same,their micro-Doppler signature is different.This Inconsistency can be considered a practical issue(especially in the frequency domain)for sonar target recognition.Despite using 128-point fast Fourier transform(FFT)for the feature extraction step,not all extracted features contain helpful information.As a result,PSO selects the most optimum and valuable features.To evaluate the micro-Doppler signature of sonar targets and the effect of feature selection on sonar target recognition,the simplest and most popular machine learning algorithm,k-nearest neighbor(k-NN),is used,which is called k-PSO in this paper because of the use of PSO for feature selection.The parameters measured are the correct recognition rate,reliability rate,and processing time.The simulation results show that k-PSO achieved a 100%correct recognition rate and reliability rate at 19.35 s when using simulated data at a 15 dB signal-tonoise ratio(SNR)angle of 40°.Also,for the experimental dataset obtained from the cavitation tunnel,the correct recognition rate is 98.26%,and the reliability rate is 99.69%at 18.46s.Therefore,the k-PSO has an encouraging performance in automatically recognizing sonar targets when using experimental datasets and for real-world use. 展开更多
关键词 micro-doppler signature Automatic recognition Feature selection K-NN PSO
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Parameter estimation for rigid body after micro-Doppler removal based on L-statistics in the radar analysis 被引量:2
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作者 Yong Wang Jian Kang 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2015年第3期457-467,共11页
In traditional inverse synthetic aperture radar (ISAR) imaging of moving targets with rotational parts, the micro-Doppler (m-D) effects caused by the rotational parts influence the quality of the radar images. Rec... In traditional inverse synthetic aperture radar (ISAR) imaging of moving targets with rotational parts, the micro-Doppler (m-D) effects caused by the rotational parts influence the quality of the radar images. Recently, L. Stankovic proposed an m-D removal method based on L-statistics, which has been proved effective and simple. The algorithm can extract the m-D effects according to different behaviors of signals induced by rotational parts and rigid bodies in time-frequency (T-F) domain. However, by removing m-D effects, some useful short time Fourier transform (STFT) samples of rigid bodies are also extracted, which induces the side lobe problem of rigid bodies. A parameter estimation method for rigid bodies after m-D removal is proposed, which can accurately re- cover rigid bodies and avoid the side lobe problem by only using m-D removal. Simulations are given to validate the effectiveness of the proposed method. 展开更多
关键词 parameter estimation L-STATISTICS micro-doppler (m-d radar imaging.
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Particle swarm optimization for rigid body reconstruction after micro-Doppler removal in radar analysis 被引量:2
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作者 LI Hongzhi WANG Yong 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2020年第3期488-499,共12页
The rotating micro-motion parts produce micro-Doppler(m-D)effects which severely influence the quality of inverse synthetic aperture radar(ISAR)imaging for complex moving targets.Recently,a method based on short-time ... The rotating micro-motion parts produce micro-Doppler(m-D)effects which severely influence the quality of inverse synthetic aperture radar(ISAR)imaging for complex moving targets.Recently,a method based on short-time Fourier transform(STFT)and L-statistics to remove m-D effects is proposed,which can separate the rigid body parts from interferences introduced by rotating parts.However,during the procedure of removing m-D parts,the useful data of the rigid body parts are also removed together with the m-D interferences.After summing the rest STFT samples,the result will be affected.A novel method is proposed to recover the missing values of the rigid body parts by the particle swarm optimization(PSO)algorithm.For PSO,each particle corresponds to a possible phase estimation of the missing values.The best particle is selected which has the minimal energy of the side lobes according to the best fitness value of particles.The simulation and measured data results demonstrate the effectiveness of the proposed method. 展开更多
关键词 micro-doppler(m-d) inverse synthetic aperture radar(ISAR) L-STATISTICS particle swarm optimization(PSO)
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Modeling simulation and experiment of micro-Doppler signature of precession 被引量:2
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作者 Hongwei Gao Lianggui Xie Shuliang Wen 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2010年第4期544-549,共6页
Spatial precession is a special micro-motion of the spinning-directional target, and the micro-Doppler signature of the cone-shaped target with precession is studied. The micro-motion model of precession is built firs... Spatial precession is a special micro-motion of the spinning-directional target, and the micro-Doppler signature of the cone-shaped target with precession is studied. The micro-motion model of precession is built first, and then the micro-Doppler model is developed based on the proposed concept of micro-motion ma- trix, by which the theoretical formula of micro-Doppler signature of precession is derived. In order to further approach to the actual case, the occlusion effect is firstly considered in micro-Doppler, and the simulated result with occlusion effect is well in accordance with the measured result in microwave anechoic chamber, which suggests that the micro-motion model and micro-Doppler model of precession are both valid. 展开更多
关键词 PRECESSION micro-doppler micro-motion matrix occlusion effect.
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DETECTION ON MICRO-DOPPLER EFFECT BASED ON LASER COHERENT RADAR 被引量:3
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作者 SunYang ZhangJun 《Journal of Electronics(China)》 2012年第1期56-61,共6页
A laser coherent detection system of 1550 nm wavelength was presented, and experimen- tal research on detecting micro-Doppler effect in a dynamic target was developed. In the study, the return signal in the time domai... A laser coherent detection system of 1550 nm wavelength was presented, and experimen- tal research on detecting micro-Doppler effect in a dynamic target was developed. In the study, the return signal in the time domain is decomposed into a set of components in different wavelet scales by multi-resolution wavelet analysis, and the components are associated with the vibrational motions in a target. Then micro-Doppler signatures are extracted by applying the reconstruction. During the course of the final data processing frequency analysis and time-frequency analysis are applied to analyze the vibrationM signals and estimate the motion parameters successfully. The experimental results indicate that the system can effectively detect micro-Doppler information in a moving target, and the tiny vibrational signatures also can be acquired effectively by wavelet multi-resolution analy- sis and time-frequency analysis. 展开更多
关键词 micro-doppler effect Laser coherent radar Multi-resolution analysis Time-frequencyanalysis
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Parity recognition of blade number and manoeuvre intention classification algorithm of rotor target based on micro-Doppler features using CNN 被引量:5
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作者 WANG Wantian TANG Ziyue +1 位作者 CHEN Yichang SUN Yongjian 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2020年第5期884-889,共6页
This paper proposes a parity recognition of blade number and manoeuvre intention classification algorithm of rotor target based on the convolutional neural network(CNN) using micro Doppler features. Firstly, the time-... This paper proposes a parity recognition of blade number and manoeuvre intention classification algorithm of rotor target based on the convolutional neural network(CNN) using micro Doppler features. Firstly, the time-frequency spectrograms are acquired from the radar echo by the short-time Fourier transform.Secondly, based on the obtained spectrograms, a seven-layer CNN architecture is built to recognize the blade-number parity and classify the manoeuvre intention of the rotor target. The constructed architecture contains a leaky rectified linear unit and a dropout layer to accelerate the convergence of the architecture and avoid over-fitting. Finally, the spectrograms of the datasets are divided into three different ratios, i.e., 20%, 33% and 50%,and the cross validation is used to verify the effectiveness of the constructed CNN architecture. Simulation results show that, on the one hand, as the ratio of training data increases, the recognition accuracy of parity and manoeuvre intention is improved at the same signal-to-noise ratio(SNR);on the other hand, the proposed algorithm also has a strong robustness: the accuracy can still reach 90.72% with an SNR of – 6 dB. 展开更多
关键词 micro-doppler convolutional neural network(CNN) parity recognition of blade number manoeuvre intention classification
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Micro-Doppler feature extraction of micro-rotor UAV under the background of low SNR 被引量:4
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作者 HE Weikun SUN Jingbo +1 位作者 ZHANG Xinyun LIU Zhenming 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2022年第6期1127-1139,共13页
Micro-Doppler feature extraction of unmanned aerial vehicles(UAVs)is important for their identification and classification.Noise and the motion state of the UAV are the main factors that may affect feature extraction ... Micro-Doppler feature extraction of unmanned aerial vehicles(UAVs)is important for their identification and classification.Noise and the motion state of the UAV are the main factors that may affect feature extraction and estimation precision of the micro-motion parameters.The spectrum of UAV echoes is reconstructed to strengthen the micro-motion feature and reduce the influence of the noise on the condition of low signal to noise ratio(SNR).Then considering the rotor rate variance of UAV in the complex motion state,the cepstrum method is improved to extract the rotation rate of the UAV,and the blade length can be intensively estimated.The experiment results for the simulation data and measured data show that the reconstruction of the spectrum for the UAV echoes is helpful and the relative mean square root error of the rotating speed and blade length estimated by the proposed method can be improved.However,the computation complexity is higher and the heavier computation burden is required. 展开更多
关键词 micro-rotor unmanned aerial vehicle(UAV) low signal to noise ratio(SNR) micro-doppler feature extraction parameter estimation
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Micro-Doppler Parameter Estimation Method Based on Compressed Sensing
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作者 Jiayun Chang Xiongjun Fu +1 位作者 Wen Jiang Min Xie 《Journal of Beijing Institute of Technology》 EI CAS 2019年第2期286-295,共10页
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 ... 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. 展开更多
关键词 FEATURE EXTRACTION compressed SENSING micro-doppler PARAMETER ESTIMATION
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Micro-Doppler effect testing technique for attitude of projectile in space flight
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作者 张万君 吴晓颖 +2 位作者 张晓炜 牛敏杰 冷雪冰 《Journal of Beijing Institute of Technology》 EI CAS 2013年第3期350-353,共4页
To measure projectile attitude in space flight, based on continuous wave (CW) radar, a new micro-Doppler effect testing technique is developed in this paper. It also establishes radar testing model for attitude of f... To measure projectile attitude in space flight, based on continuous wave (CW) radar, a new micro-Doppler effect testing technique is developed in this paper. It also establishes radar testing model for attitude of flying projectile and resolve micro-Doppler effect of projectile motion attitude. By distinguishing and geting attitude parameters such as micro-motion period, this technique can in- tuitively estimate the flight stability of projectile, and the validity of this technique is proved accord- ing to flight tests. 展开更多
关键词 attitude of projectile micro-doppler radar testing target micro-motion
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Convex Optimization-Based Rotation Parameter Estimation Using Micro-Doppler
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作者 Kyungwoo Yoo Joohwan Chun +1 位作者 Seungoh Yoo Chungho Ryu 《Journal of Electrical Engineering》 2016年第4期157-164,共8页
We present a novel algorithm that can determine rotation-related parameters of a target using FMCW (frequency modulated continuous wave) radars, not utilizing inertia information of the target. More specifically, th... We present a novel algorithm that can determine rotation-related parameters of a target using FMCW (frequency modulated continuous wave) radars, not utilizing inertia information of the target. More specifically, the proposed algorithm estimates the angular velocity vector of a target as a function of time, as well as the distances of scattering points in the wing tip from the rotation axis, just by analyzing Doppler spectrograms obtained from three or more radars. The obtained parameter values will be useful to classify targets such as hostile warheads or missiles for real-time operation, or to analyze the trajectory of targets under test for the instrumentation radar operation. The proposed algorithm is based on the convex optimization to obtain the rotation-related parameters. The performance of the proposed algorithm is assessed through Monte Carlo simulations. Estimation performance of the proposed algorithm depends on the target and radar geometry and improves as the number of iterations of the convex optimization steps increases. 展开更多
关键词 micro-doppler FMCW radar STFT (short-time Fourier transform) convex optimization rotation parameter.
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基于同步提取变换和脊线检测的空间锥体目标微多普勒特征提取方法
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作者 王磊 苏倩 +1 位作者 韦高 李建周 《系统工程与电子技术》 EI CSCD 北大核心 2024年第11期3684-3689,共6页
针对空间锥体目标微多普勒(micro-Doppler,m-D)提取时在m-D曲线交叉处易出现跟踪错误的问题,提出一种基于同步提取变换(synchro-extracting transform,SET)和脊线检测的m-D特征提取方法。首先,该方法利用SET技术得到能量分布更加集中的... 针对空间锥体目标微多普勒(micro-Doppler,m-D)提取时在m-D曲线交叉处易出现跟踪错误的问题,提出一种基于同步提取变换(synchro-extracting transform,SET)和脊线检测的m-D特征提取方法。首先,该方法利用SET技术得到能量分布更加集中的时频像,并使用Hough变换提取锥体顶部产生的正弦m-D曲线;之后基于CLEAN思想,将提取到的顶部m-D曲线从时频像中消除;最后利用基于改进疯爬算法和卡尔曼滤波的脊线检测算法提取锥体底部产生的非正弦m-D曲线。仿真结果表明,该方法可以避免m-D曲线交叉处的跟踪错误问题,正确提取m-D特征。 展开更多
关键词 同步提取变换 空间锥体目标 微多普勒 HOUGH变换
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改进M-D结构的二次多变量Hash算法 被引量:2
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作者 王尚平 任姣霞 +1 位作者 张亚玲 韩照国 《哈尔滨工程大学学报》 EI CAS CSCD 北大核心 2011年第4期464-470,共7页
针对传统Hash算法有安全缺陷的问题,利用有限域上多变量二次方程组求解(MQ)问题的困难性,设计了一种新的基于有限域上多变量二次多项式的Hash算法.新算法给出了一个改进的M-D结构,采用了NMAC(nested MAC)的思想,并加入了计数器,旨在抵... 针对传统Hash算法有安全缺陷的问题,利用有限域上多变量二次方程组求解(MQ)问题的困难性,设计了一种新的基于有限域上多变量二次多项式的Hash算法.新算法给出了一个改进的M-D结构,采用了NMAC(nested MAC)的思想,并加入了计数器,旨在抵抗一些针对传统M-D结构的攻击.新算法具有可调的输出参数,可以适应不同程度的安全性需求.新算法可以抵抗常见的攻击,且具有良好的雪崩效应.新算法相对于以往的多变量Hash算法,在内存需求上和运行速度上都有一定的优势. 展开更多
关键词 HASH算法 m-d结构 MQ问题 信息摘要
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Banach空间中m-d增生映射零点的强弱收敛定理 被引量:2
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作者 魏利 刘元星 《数学杂志》 CSCD 北大核心 2016年第3期573-583,共11页
本文研究了m-d增生映射的零点以及有限个m-d增生映射公共零点的迭代设计问题.利用Lyapunov泛函与广义f投影映射等技巧,在Banach空间中,证明了迭代序列强收敛或弱收敛到m-d增生映射的零点或有限个m-d增生映射的公共零点.与以往的相关研... 本文研究了m-d增生映射的零点以及有限个m-d增生映射公共零点的迭代设计问题.利用Lyapunov泛函与广义f投影映射等技巧,在Banach空间中,证明了迭代序列强收敛或弱收敛到m-d增生映射的零点或有限个m-d增生映射的公共零点.与以往的相关研究工作相比,迭代设计中考虑了误差项、迭代格式被简化、限定条件被削弱. 展开更多
关键词 LYAPUNOV泛函 广义f投影映射 m-d增生映射 零点
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A^2/O前置M-D地埋式一体化生物反应器处理某小城镇综合污水
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作者 李亚峰 杨曦 《水处理技术》 CAS CSCD 北大核心 2014年第10期128-130,共3页
以浑河上游某支流河污水处理工程为实例,介绍A2/O前置M-D地埋式一体化生物反应器处理综合生活污水工艺的设计参数、处理效果及工程投资和运行成本。该项工程处理水量为500t/d,进水BOD5、COD和SS、NH3-N、TN、TP的质量浓度分别为138mg/L... 以浑河上游某支流河污水处理工程为实例,介绍A2/O前置M-D地埋式一体化生物反应器处理综合生活污水工艺的设计参数、处理效果及工程投资和运行成本。该项工程处理水量为500t/d,进水BOD5、COD和SS、NH3-N、TN、TP的质量浓度分别为138mg/L、305mg/L和150、35、33、4mg/L。运行结果表明,对BOD5、COD、SS、NH3-N、TN和TP的去除率分别为88.4%、86.9%、93.3%、82.9%、63.6%和75%,比传统A2/O工艺具有更好的脱氮除磷效果。出水水质达到GB 18918-2002的一级B要求,处理费用1.18元/t。该工艺具有运行成本低、高效快速、操作管理方便等突出优点。 展开更多
关键词 A^2/O前置m-d地埋式一体化生物反应器 城镇生活污水 脱氮除磷
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FORMULA OF GLOBAL SMOOTH SOLUTION FOR NON-HOMOGENEOUS M-D CONSERVATION LAW WITH UNBOUNDED INITIAL VALUE 被引量:1
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作者 曹高伟 胡凯 杨小舟 《Acta Mathematica Scientia》 SCIE CSCD 2015年第2期508-526,共19页
In this article, we prove the existence and obtain the expression of its solution formula of global smooth solution for non-homogeneous multi-dimensional(m-D) conservation law with unbounded initial value; our metho... In this article, we prove the existence and obtain the expression of its solution formula of global smooth solution for non-homogeneous multi-dimensional(m-D) conservation law with unbounded initial value; our methods are new and essentially different with the situation of bounded initial value. 展开更多
关键词 Solution formula non-homogeneous m-d conservation laws global smooth solution global implicit function
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关于M-D及相关不等式
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作者 姚秀凤 《数学学习与研究》 2019年第15期3-4,7,共3页
本文利用控制不等式理论给出了Mitrinovic-Djokovic不等式的一个控制证明和相关不等式,建立了若干新的不等式.
关键词 m-d不等式 SCHUR凸性 受控
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新性价比之选 技嘉B150M-D3H主板
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《计算机与网络》 2016年第14期28-28,共1页
随着新一代100系列主板的更新,作为上代性价比之选的B85平台也迎来了它的继任者——B150。相较于上一代主板平台,B150的变化主要体现在四方面:CPU插槽由LGA1150变为LGA1151;DMI 2.0总线全面升级至DMI 3.0;支持DDR3/4两种规格的内存;原... 随着新一代100系列主板的更新,作为上代性价比之选的B85平台也迎来了它的继任者——B150。相较于上一代主板平台,B150的变化主要体现在四方面:CPU插槽由LGA1150变为LGA1151;DMI 2.0总线全面升级至DMI 3.0;支持DDR3/4两种规格的内存;原生支持1个SATA-Express接口。今天笔者向大家推荐的便是技嘉B150M-D3H主板,这款主板在国美在线的售价仅为569元,比其他电商低100元左右,十分超值,近期有装机需求的小伙伴可以考虑入手。 展开更多
关键词 B150m-d3H 技嘉 小伙伴 之选 继任者 国美 数据带宽 供电设计 板型 DIMM
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Two-Dimensional Riemann Problems:Transonic Shock Waves and Free Boundary Problems
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作者 Gui-Qiang G.Chen 《Communications on Applied Mathematics and Computation》 2023年第3期1015-1052,共38页
We are concerned with global solutions of multidimensional(M-D)Riemann problems for nonlinear hyperbolic systems of conservation laws,focusing on their global configurations and structures.We present some recent devel... We are concerned with global solutions of multidimensional(M-D)Riemann problems for nonlinear hyperbolic systems of conservation laws,focusing on their global configurations and structures.We present some recent developments in the rigorous analysis of two-dimensional(2-D)Riemann problems involving transonic shock waves through several prototypes of hyperbolic systems of conservation laws and discuss some further M-D Riemann problems and related problems for nonlinear partial differential equations.In particular,we present four different 2-D Riemann problems through these prototypes of hyperbolic systems and show how these Riemann problems can be reformulated/solved as free boundary problems with transonic shock waves as free boundaries for the corresponding nonlinear conservation laws of mixed elliptic-hyperbolic type and related nonlinear partial differential equations. 展开更多
关键词 Riemann problems Two-dimensional(2-D) Transonic shocks Solution structure Free boundary problems Mixed elliptic-hyperbolic type Global configurations Large-time asymptotics Global attractors Multidimensional(m-d) Shock capturing methods
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弹道目标平动补偿与微多普勒特征提取方法 被引量:34
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作者 罗迎 柏又青 +2 位作者 张群 段艳丽 朱丰 《电子与信息学报》 EI CSCD 北大核心 2012年第3期602-608,共7页
针对传统逆合成孔径雷达(ISAR)成像中的平动补偿方法并不适用于弹道目标平动补偿的问题,该文提出了一种弹道目标平动补偿与微多普勒(m-D)特征提取方法。在分析有翼弹道目标未完成平动补偿时的m-D效应的基础上,首先采用形态学中的骨架提... 针对传统逆合成孔径雷达(ISAR)成像中的平动补偿方法并不适用于弹道目标平动补偿的问题,该文提出了一种弹道目标平动补偿与微多普勒(m-D)特征提取方法。在分析有翼弹道目标未完成平动补偿时的m-D效应的基础上,首先采用形态学中的骨架提取方法抑制1维距离像旁瓣,再在快时间频率(距离)-慢时间平面上搜索分离各散射点的m-D特征曲线,然后对其进行经验模式分解(EMD)分解,利用分解结果中的趋势项分量完成目标回波的平动补偿,并通过分析EMD分解结果获得了目标的自旋频率、锥旋频率等特征信息。仿真实验验证了所提方法的有效性与鲁棒性。 展开更多
关键词 目标识别 弹道目标 微多普勒(m-d) 经验模式分解(EMD)
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OFD-LFM MIMO雷达中旋转目标微多普勒效应分析及三维微动特征提取 被引量:14
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作者 罗迎 张群 +2 位作者 封同安 李松 梁贤姣 《电子与信息学报》 EI CSCD 北大核心 2011年第1期8-13,共6页
该文将微多普勒效应引入到多输入多输出(MIMO)雷达技术研究,以旋转运动目标为例,分析了雷达辐射正交频分线性调频信号(OFD-LFM)时目标的微多普勒效应,给出了其参数化表达。在此基础上,进一步将微多普勒理论从目前的雷达视线方向上的微... 该文将微多普勒效应引入到多输入多输出(MIMO)雷达技术研究,以旋转运动目标为例,分析了雷达辐射正交频分线性调频信号(OFD-LFM)时目标的微多普勒效应,给出了其参数化表达。在此基础上,进一步将微多普勒理论从目前的雷达视线方向上的微动分量提取扩展到微动部件3维运动和结构特征提取,利用MIMO雷达的多视角特性,提出了构建多元非线性方程组求解旋转部件的3维运动参数的算法,实现了目标3维微动特征的提取。仿真实验验证了算法的有效性和鲁棒性。 展开更多
关键词 多输入多输出雷达 微多普勒 旋转目标 目标识别
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