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基于WGAN-GP-CNN的海面小目标检测

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信号处理 2024年第6期40卷 1082-1097页

作者：时艳玲陶平许述文南京邮电大学通信与信息工程学院江苏南京210003 西安电子科技大学雷达信号处理全国重点实验室陕西西安710071

针对传统基于统计理论的海面小目标检测方法在复杂海面环境中性能不高的问题,该文提出了一种改进的检测方法。首先通过分析海杂波和目标回波的特征,将检测问题转化为特征空间的分类任务。鉴于海面小目标样本数量有限,存在样本不平衡的问... 详细信息

针对传统基于统计理论的海面小目标检测方法在复杂海面环境中性能不高的问题,该文提出了一种改进的检测方法。首先通过分析海杂波和目标回波的特征,将检测问题转化为特征空间的分类任务。鉴于海面小目标样本数量有限,存在样本不平衡的问题,该文引入了一种基于梯度惩罚的沃瑟斯坦生成对抗网络(Wasserstein Generative Adversarial Network with Gradient Penalty,WGAN-GP)来增强目标数据,从而在数量上平衡目标样本与海杂波样本。同时,对原始WGAN-GP网络的损失函数进行了改进,引入相位损失以确保生成数据能够反映真实数据的相位信息。基于这些数据,进一步提取了生成目标和海杂波的高维特征,并将其送入卷积神经网络(Convolutional Neural Network,CNN)进行训练。为了应对高维特征空间中虚警概率难以控制的问题,对CNN算法进行了改进,通过设置Softmax分类器的阈值,实现了虚警概率可控。最后,借助公开的IPIX雷达数据集进行实验验证,所提的WGAN-GP-CNN检测器在积累时间为1.024 s,虚警概率为0.001时,平均检测概率达到0.8683,具有良好的检测效果。

关键词：海杂波小目标检测虚警可控生成对抗网络卷积神经网络

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基于无监督图互信息最大化的海面小目标异常检测

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电子与信息学报 2024年第7期46卷 2712-2720页

作者：许述文何绮茹宏涛西安电子科技大学雷达信号处理国家重点实验室西安710071

受到复杂海洋环境的影响,雷达对海面慢速小目标难以实现高性能检测。对于这类目标,传统的基于能量的统计检测方法存在着严重的性能损失。针对这一问题,该文提出了基于互信息最大化框架下的海面小目标检测方法,实现海杂波背景下的无监督... 详细信息

受到复杂海洋环境的影响,雷达对海面慢速小目标难以实现高性能检测。对于这类目标,传统的基于能量的统计检测方法存在着严重的性能损失。针对这一问题,该文提出了基于互信息最大化框架下的海面小目标检测方法,实现海杂波背景下的无监督目标异常检测任务。首先,考虑到高分辨雷达回波不满足传统神经网络对样本独立同分布的假设,该文从图的角度重新建模数据,利用回波的空时相关特性来构建图拓扑结构。该文提出相对最大节点度并联合7个已有特征作为节点的初始表示向量。接下来,采用图注意力网络作为互信息最大化框架中的编码器学习节点表示向量。最后,使用异常检测算法进行目标检测,并实现虚警可控。经实测数据验证,使用快速凸包学习算法时,相比三特征检测器,所提检测器性能提升了9.2%;相比时频三特征检测器,性能提升了7.9%。当网络输出更高维的表示向量时,使用孤立森林算法的检测器的性能提升了27.4%。

关键词：海杂波目标检测图神经网络无监督学习

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基于观测和再分析资料的气温、海表温度在江苏海域的比较分析

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海洋开发与管理 2024年第2期41卷 131-140页

作者：高清清李用留吉会峰曹兵丁言者徐淑雯徐常三自然资源部南通海洋中心南通226002

文章利用海洋台站观测资料,对3类再分析资料的气温、海表温度数据在江苏海域进行比较分析。结果表明:总体而言,气温、海表温度的再分析数据与观测数据均具有很高的一致性,且海表温度再分析数据与观测数据的一致性高于气温再分析数据;在... 详细信息

文章利用海洋台站观测资料,对3类再分析资料的气温、海表温度数据在江苏海域进行比较分析。结果表明:总体而言,气温、海表温度的再分析数据与观测数据均具有很高的一致性,且海表温度再分析数据与观测数据的一致性高于气温再分析数据;在3种再分析资料中,ERA5的可靠性优于JRA-55和NCEP;在离岸较远的外磕脚测点,再分析数据与观测数据的一致性高于另2个测点;在台风影响期间,吕四测点、外磕脚测点的再分析数据与观测数据更为接近,在更近岸的连云港测点,再分析数据与观测数据的差异更大;在冷空气造成的气温下降期间,再分析数据与观测数据的差异较小,但在气温缓步回升期间,吕四测点、外磕脚测点的再分析数据明显高于观测数据;在冷空气影响过程中,再分析数据反映的海表温度下降幅度明显低于观测数据。本研究可为再分析资料在江苏海域的适用性和可信度提供评估依据。

关键词：气温海表温度再分析资料江苏海域

Robust asymmetric Cherenkov radiation in tilted anisotropic medium

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Science China(Physics,Mechanics & Astronomy) 2024年第1期67卷 46-51页

作者： shuwen xue Yadong xu Linkang Han Zhi Ning Chen Qiaoliang Bao Shan Zhu Huanyang Chen Institute of Electromagnetics and Acoustics and Department of Physics College of Physical Science and TechnologyJiujiang Research InstituteXiamen UniversityXiamen 361005China School of Physical Science and Technology Institute of Theoretical and Applied PhysicsSoochow UniversitySuzhou 215006China Department of Electrical and Computer Engineering National University of SingaporeSingapore 8117583Singapore Institute of Energy Materials Science(IEMS) University of Shanghai for Science and TechnologyShanghai 200093China

Cherenkov radiation(CR)is available for a wide variety of terahertz(THz)radiation sources,but its efficiency is deeply affected by intrinsic *** find that if the tilted angle(α)of anisotropic material and radiation angle(θ)meet the condition ofθ+α=π/2,the intensity of radiation fields for the charged particle bunch(CPB)moving from left to right cannot be influenced by intrinsic losses,which means long-distance radiation can be ***,we observe an asymmetric CR when the CPB moves from the opposite *** addition,we select natural van der Waals(vd W)materialα-MoO3as an example,further confirming that the radiation field can reach the far field and the asymmetric CR radiation can also be *** wonderful properties with long-distance radiation will extend the application of CR to a certain extent for future design and fabrication.

关键词： asymmetric Cherenkov radiation intrinsic losses long-distance radiation

Performance analysis of multi-channel order statistics detector for range-spread target

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Journal of Systems Engineering and Electronics 2012年第5期23卷 689-699页

作者： shuwen xu Penglang Shui National Laboratory of Radar Signal Processing Xidian UniversityXi'an 710071R R.China

The problem of two order statistics detection schemes for the detection of a spatially distributed target in white Gaussian noise are *** the number of strong scattering cells is known,we first show an optimal detector,which requires many processing *** structure of such optimal detector is ***,a simpler quasi-optimal detector is then *** quasi-optimal detector,called the strong scattering cells’ number dependent order statistics（SND-OS） detector,takes the form of an average of maximum strong scattering cells with a known *** the number of strong scattering cells is unknown in real situation,the multi-channel order statistics（MC-OS） detector is *** each channel,a various number of maximums scattered from target are ***,the false alarm probability analysis and thresholds sets for each channel are given,following the detection results presented by means of Monte Carlo simulation strategy based on simulated target model and three measured *** particular,the theoretical analysis and simulation results highlight that the MC-OS detector can efficiently detect range-spread targets in white Gaussian noise.

关键词： order statistics strong scattering cell multi-channel range-spread target

Improved track-before-detect method for detecting range-spread targets in generalized Pareto clutter

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Science China(Information Sciences) 2019年第4期62卷 44-46页

作者： Jian xuE shuwen xu Penglang SHUI National Lab of Radar Signal Processing Collaborative Innovation Center of Information Sensing and UnderstandingXidian University Department of Electrical and Computer Engineering Mcmaster University

Dear editor,High-resolution radars demonstrate a good targetdetection performance, especially for weak targets such as periscopes and small boats [1]. Methods for adaptive detection employed by high-resolution

关键词： TBD Improved track-before-detect method for detecting range-spread targets in generalized Pareto clutter SCR

Assessment of Dependent Performance Shaping Factors in SPAR-H Based on Pearson Correlation Coefficient

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Computer Modeling in Engineering & Sciences 2024年第2期138卷 1813-1826页

作者： Xiaoyan Su shuwen Shang Zhihui xu Hong Qian Xiaolei Pan School of Automation Engineering Shanghai University of Electric PowerShanghai 200090China State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment Shenzhen518172China

With the improvement of equipment reliability,human factors have become the most uncertain part in the *** standardized Plant Analysis of Risk-Human Reliability Analysis(SPAR-H)method is a reliable method in the field of human reliability analysis(HRA)to evaluate human reliability and assess risk in large complex ***,the classical SPAR-H method does not consider the dependencies among performance shaping factors(PSFs),whichmay cause overestimation or underestimation of the risk of the actual *** address this issue,this paper proposes a new method to deal with the dependencies among PSFs in SPAR-H based on the Pearson correlation ***,the dependence between every two PSFs is measured by the Pearson correlation ***,the weights of the PSFs are obtained by considering the total dependence ***,PSFs’multipliers are modified based on the weights of corresponding PSFs,and then used in the calculating of human error probability(HEP).A case study is used to illustrate the procedure and effectiveness of the proposed method.

关键词： Reliability evaluation human reliability analysis SPAR-H performance shaping factors dependence pearson correlation analysis

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基于标签传播算法的海面漂浮小目标检测方法

电子与信息学报 2022年第6期44卷 2119-2126页

作者：许述文茹宏涛西安电子科技大学雷达信号处理国家重点实验室西安710071

在高分辨体制下海杂波与海面小目标具有复杂的特性,特别是对于雷达散射截面积较小的海面漂浮目标,传统的检测方法性能不佳。为了突破临界信杂比情况下的检测性能,可以提取雷达回波的一种或者多种特征,从而进行特征检测,该方法是实现临... 详细信息

在高分辨体制下海杂波与海面小目标具有复杂的特性,特别是对于雷达散射截面积较小的海面漂浮目标,传统的检测方法性能不佳。为了突破临界信杂比情况下的检测性能,可以提取雷达回波的一种或者多种特征,从而进行特征检测,该方法是实现临界信杂比情况下有效检测的重要途经。目前,在3维及以下的特征空间中可以使用凸包学习算法计算判决区域并有效地控制虚警概率,但是在3维以上的特征空间中凸包学习算法计算复杂度提高,难以进行检测。针对这个问题,该文提出一种基于标签传播算法的海面小目标检测方法,它突破了凸包学习算法的维数限制和决策域必须为凸集的形状限制,能够在高维特征空间进行检测并有效地控制虚警。经过实测数据集验证,基于标签传播算法的海面小目标检测方法在0.512 s和1.024 s的观测时间内分别获得了88.4%和92.0%的检测概率,相比于基于K近邻(KNN)的检测器有了3.3%和2.8%的检测概率提升。

关键词：高分辨海杂波特征检测标签传播算法可控虚警

An Improved CREAM Model Based on DS Evidence Theory and DEMATEL

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Computer Modeling in Engineering & Sciences 2024年第3期138卷 2597-2617页

作者： Zhihui xu shuwen Shang Yuntong Pu Xiaoyan Su Hong Qian Xiaolei Pan State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment Shenzhen518172China School of Automation Engineering Shanghai University of Electric PowerShanghai200090China School of Safety and Management Engineering Hunan Institute of TechnologyHengyang421002China

Cognitive Reliability and Error Analysis Method(CREAM)is widely used in human reliability analysis(HRA).It defines nine common performance conditions(CPCs),which represent the factors thatmay affect human reliability and are used to modify the cognitive failure probability(CFP).However,the levels of CPCs are usually determined by domain experts,whichmay be subjective and ***’smore,the classicCREAMassumes that the CPCs are independent,which is *** the dependence among CPCs will result in repeated calculations of the influence of the CPCs on CFP and lead to unreasonable reliability *** address the issue of uncertain information modeling and processing,this paper introduces evidence theory to evaluate the CPC levels in specific *** address the issue of dependence modeling,the Decision-Making Trial and Evaluation Laboratory(DEMATEL)method is used to process the dependence among CPCs and calculate the relative weights of each CPC,thus modifying the multiplier of the *** detailed process of the proposed method is illustrated in this paper and the CFP estimated by the proposed method is more reasonable.

关键词： Human reliability analysis CREAM uncertainty modeling dependence Dempster-Shafer evidence theory DEMATEL