期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到327篇文章
< 1 2 … 17 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Depth-domain well–seismic calibration method and application based on constrained dynamic warping 认领 引用 被引量：1
1
作者 Niu Cong Wang Jian-hua +4 位作者 Ye Yun-fei Ling Yun Wang Cong Wang Di Zhou Peng 《Applied Geophysics》 SCIE CSCD 2026年第1期352-367,434,共16页
Depth migration can image complex structures with high accuracy,thereby stimulating the increasingly urgent demands for developing depth-domain inversions and interpretations in industry.The well-seismic calibration i... Depth migration can image complex structures with high accuracy,thereby stimulating the increasingly urgent demands for developing depth-domain inversions and interpretations in industry.The well-seismic calibration in the depth domain serves as a crucial cornerstone for these interpretations and inversions.Well data provide a partial cognition of underground media.Seismic data must be accurately calibrated with well data to expand this cognition outward.Depth-domain seismic data are non-stationary,transforming traditional,mature time-domain well calibration methods unsuitable for direct application to depth-domain seismic data.Therefore,researchers usually adopt a domain transformation strategy to complete well-seismic calibration in the time domain and then convert the calibration results into the depth domain.However,this method inevitably introduces additional error accumulation caused by domain transformation.On the basis of a comprehensive review of previous research,we propose a direct depth-domain well-seismic calibration method.This method is based on the synthesis of the depth-domain seismic records and the extraction of the depth-domain generalized seismic wavelets.We introduce constrained dynamic warping with maximum stretch depth constraint and directly match seismic data with well data in the depth domain.The actual processing results show that the method improves the efficiency of the depth-domain well-seismic calibration and produces a reliable relationship between seismic and well depths after two to four iterations. 展开更多
关键词 depth-domain well-seismic calibration depth-domain synthetic seismic records depth-domain generalized seismic wavelet extraction constrained dynamic warping
暂未订购 下载PDF
Optimizing differential travel-time measurements with dynamic time warping 认领 引用
2
作者 LIU Jian-xin NIE Zi-ting +1 位作者 HOU Xin-rong GAO Da-wei 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第2期834-846,共13页
Precise differential travel-time measurement is essential for earthquake relative locating.The waveform cross correlation(WCC)technique is widely regarded as the most effective method for calculating the differential ... Precise differential travel-time measurement is essential for earthquake relative locating.The waveform cross correlation(WCC)technique is widely regarded as the most effective method for calculating the differential travel-time of seismic phases.However,for earthquake pairs with large magnitude differences,substantial biases can arise due to disparities in the duration of the initial pulse,potentially leading to significant mislocations,particularly for mainshocks.To overcome this limitation,we propose to use the dynamic time warping(DTW)algorithm to optimize differential travel-time calculation.Using high-quality earthquake waveform data from the San Andreas Fault(2012−2019),we systematically compared the performance of DTW and WCC,respectively.Our results demonstrate that DTW substantially improves differential travel-time measurements,especially in cases involving large magnitude differences.In addition,we tested the robustness of DTW using noisy seismic data,demonstrating its superior resilience to noise. 展开更多
关键词 dynamic time warping waveform cross-correlation differential travel-time measurement magnitude difference
暂未订购 下载PDF
基于warping变换的单水听器距离估计方法 认领 引用
3
作者 肖雅宁 王好忠 《应用声学》 CSCD 北大核心 2026年第4期1123-1133,共11页
随着小型水下移动探测平台的广泛应用,基于单水听器的目标定位方法愈加重要。该文针对中远场浅海声波导中宽带脉冲信号声源被动距离估计问题,将群延迟理论与warping变换相结合,提出了一种适用于声速不变或缓变的浅海波导中的宽带脉冲声... 随着小型水下移动探测平台的广泛应用,基于单水听器的目标定位方法愈加重要。该文针对中远场浅海声波导中宽带脉冲信号声源被动距离估计问题,将群延迟理论与warping变换相结合,提出了一种适用于声速不变或缓变的浅海波导中的宽带脉冲声源距离估计方法。通过对接收信号进行时频分析可以获取不同模态在不同频率下到达接收器的时间,利用warping变换可以消除简正波传播过程中的频散效应,进而获取简正波的截止频率,利用简正波的到达时延差和截止频率信息即可实现宽带脉冲声源距离估计。数值仿真和海试实验数据均表明,该方法的距离估计结果与实际距离符合良好,平均测距误差在15%以内。 展开更多
关键词 单水听器 被动测距 群延时 warping变换
暂未订购 下载PDF
双深度Warping变换的浅海近水面声源被动测距 认领 引用
4
作者 陈孟奇 郭良浩 +1 位作者 刘建军 张灵珊 《声学学报》 EI CAS CSCD 北大核心 2025年第5期1079-1094,共16页
在浅海水声环境中, Warping变换可在频域分离相干分量,但被动测距需辨识特征频率峰的模态阶数。由于负跃层条件下低阶简正波衰减严重,增加了模态判别难度。为此,提出了一种双深度Warping变换方法,在垂直双水听器的接收条件下,将两个深... 在浅海水声环境中, Warping变换可在频域分离相干分量,但被动测距需辨识特征频率峰的模态阶数。由于负跃层条件下低阶简正波衰减严重,增加了模态判别难度。为此,提出了一种双深度Warping变换方法,在垂直双水听器的接收条件下,将两个深度处自相关函数Warping变换差异结合互相关函数Warping变换对模态阶数信息进行筛选,可降低被动测距的模糊问题。同时,通过分割信号处理频带,组合宽频带和窄频带的特征频率信息,可有效提升被动测距的性能。当双接收深度的声场相干分量垂直相关系数较低时,两个深度的自相关函数Warping变换主特征频率峰位置差异较大,此时被动测距方法的性能较好;双接收深度的垂直相关系数较高时,可引起测距性能下降。仿真结果和试验数据处理结果均验证了所提方法的有效性。 展开更多
关键词 Warping变换 互相关函数 垂直双水听器 测距模糊 模态判别
暂未订购 下载PDF
Calculation method for bending-warping shear stress of single-box multicell box girders 认领 引用
5
作者 ZHANG Yuyuan MA Xiao +1 位作者 ZHANG Yuanhai FAN Jiang 《Journal of Southeast University(English Edition)》 EI CAS 2025年第4期493-500,共8页
To investigate the influence of the shear lag effect on the bending shear stress of single-box multicell box gird-ers(MCBG),the shear lag warping additional deflection is selected as the generalized displacement.The g... To investigate the influence of the shear lag effect on the bending shear stress of single-box multicell box gird-ers(MCBG),the shear lag warping additional deflection is selected as the generalized displacement.The governing dif-ferential equations and boundary conditions for the shear lag of the MCBG are derived using the energy variational method.Based on the shear lag warping deformation state of the MCBG and by employing the microelement equilib-rium differential equation and the coordination conditions for shear lag warping deformation,the calculation method for the bending-warping shear stress of the MCBG is de-rived,and the influence of the width-to-span and height-to span ratios on bending-warping shear stress is analyzed.Ex-ample analysis shows that the bending-warping shear stress of the MCBG calculated by the proposed calculation method coincides with the finite element solution,and the warping shear stress satisfies the self-balancing condition of shear warping,thus verifying the accuracy of the proposed method.The warping shear stress exhibits an antisymmetric distribution about the vertical axis of symmetry and has a weakening effect on the shear stress of the elementary beam(EB).The larger the width-to-span ratio is,the larger the proportion of the warping shear stress of the EB.The larger the height-to-span ratio is,the smaller the proportion of the warping shear stress and the more significant the influence of the width-to-span ratio.The more the number of cells is,the smaller the influence of the warping shear stress on the total bending shear stress.The influence of the shear lag ef-fect can be ignored in the calculation of the bending shear stress of three or more cells in the MCBG. 展开更多
关键词 single-box multicell box girders(MCBG) shear lag shear warping coordination conditions shear stress parametric analysis
暂未订购 下载PDF
An intelligent log-seismic integrated stratigraphic correlation method based on wavelet frequency-division transform and dynamic time warping:A case study from the Lasaxing oilfield 认领 引用
6
作者 Mian Lu Dongmei Cai +4 位作者 Xiandi Fu Shunguo Cheng Yu Sun Pengkun Liu Yanli Jiao 《Energy Geoscience》 EI CAS CSCD 2025年第3期26-36,共11页
Stratigraphic correlations are essential for the fine-scale characterization of reservoirs.However,conventional data-driven methods that rely solely on log data struggle to construct isochronous stratigraphic framewor... Stratigraphic correlations are essential for the fine-scale characterization of reservoirs.However,conventional data-driven methods that rely solely on log data struggle to construct isochronous stratigraphic frameworks for complex sedimentary environments and multi-source geological settings.In response,this study proposed an intelligent,automatic,log-seismic integrated stratigraphic correlation method that incorporates wavelet frequency-division transform(WFT)and dynamic time warping(DTW)(also referred to as the WFT-DTW method).This approach integrates seismic data as constraints into stratigraphic correlations,enabling accurate tracking of the seismic marker horizons through WFT.Under the constraints of framework construction,a DTW algorithm was introduced to correlate sublayer boundaries automatically.The effectiveness of the proposed method was verified through a stratigraphic correlation experiment on the SA0 Formation of the Xingshugang block in the Lasaxing oilfield,the Songliao Basin,China.In this block,the target layer exhibits sublayer thicknesses ranging from 5 m to 8 m,an average sandstone thickness of 2.1 m,and pronounced heterogeneity.The verification using 1760 layers in 160 post-test wells indicates that the WFT-DTW method intelligently compared sublayers in zones with underdeveloped faults and distinct marker horizons.As a result,the posterior correlation of 1682 layers was performed,with a coincidence rate of up to 95.6%.The proposed method can complement manual correlation efforts while also providing valuable technical support for the lithologic and sand body characterization of reservoirs. 展开更多
关键词 Log-seismic integration Stratigraphic correlation Wavelet frequency transform Dynamic time warping Lasaxing oilfield
暂未订购 下载PDF
基于warping变换波数谱的运动声源速度估计方法研究 认领 引用
7
作者 谢世伟 徐铭 +1 位作者 袁笑 苟欣迪 《海洋湖沼通报（中英文）》 CSCD 北大核心 2025年第3期90-97,共8页
当接收器静止,声源保持同一深度沿直线匀速运动时,频域上接收到的声压信号相位随时间呈非线性变化,运用warping变换可以实现相位线性化,以此提出一种利用该变换估计声源运动参数的算法。首先构造不同运动参数下的warping算子,再利用算... 当接收器静止,声源保持同一深度沿直线匀速运动时,频域上接收到的声压信号相位随时间呈非线性变化,运用warping变换可以实现相位线性化,以此提出一种利用该变换估计声源运动参数的算法。首先构造不同运动参数下的warping算子,再利用算子对接收到的频域声压进行重采样,最后对重采样后的声压进行傅里叶变换得到相应的波数谱;据此,可以利用特定区间波数谱能量最大来实现声源速度估计,另外,在低信噪比条件下,讨论了一种基于速度-波数谱能量图的声源速度估计方案。实验和仿真数据验证了以上方法的有效性。 展开更多
关键词 相位线性化 warping变换 声源运动速度估计
暂未订购 下载PDF
Study on Problems and Countermeasures in the Construction of Warping Dam Projects in the Loess Plateau Area 认领 引用
8
作者 Xia Ji 《Journal of Architectural Research and Development》 2025年第6期11-17,共7页
In recent years,to better address soil erosion,the Loess Plateau area has seen a surge in the construction of warping dam projects.Warping dams have strong functions in soil and water conservation as well as warping f... In recent years,to better address soil erosion,the Loess Plateau area has seen a surge in the construction of warping dam projects.Warping dams have strong functions in soil and water conservation as well as warping for farmland creation,serving as a key support for ecological restoration and economic development in the Loess Plateau area in the new era.However,in light of practical conditions,there are many problems in their construction process,which have affected their actual operation quality.In this regard,while expounding on the value and significance of warping dam project construction in the Loess Plateau area,this paper discusses the existing problems and effective countermeasures,aiming to provide some references for relevant personnel. 展开更多
关键词 Keywords:Loess plateau Warping dam project Value and significance Existing problems Effective countermeasures
暂未订购 下载PDF
SOLUTION OF GENERALIZED COORDINATE FOR WARPING FOR NATURALLY CURVED AND TWISTED BEAMS 认领 引用 被引量：1
9
作者 虞爱民 易明 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2004年第10期1166-1175,共10页
A theoretical method for static analysis of naturally curved and twisted beams under complicated loads was presented, with special attention devoted to the solving process of governing equations which take into accoun... A theoretical method for static analysis of naturally curved and twisted beams under complicated loads was presented, with special attention devoted to the solving process of governing equations which take into account the effects of torsion-related warping as well as transverse shear deformations. These governing equations, in special cases, can be readily solved and yield the solutions to the problem. The solutions can be used for the analysis of the beams, including the calculation of various internal forces, stresses, strains and displacements. The present theory will be used to investigate the stresses and displacements of a plane curved beam subjected to the action of horizontal and vertical distributed loads. The numerical results obtained by the present theory are found to be in very good agreement with the results of the FEM results. Besides, the present theory is not limited to the beams with a double symmetric cross-section, it can also be extended to those with arbitrary cross-sectional shape. 展开更多
关键词 naturally curved and twisted beam St. Venant torsional warping function generalized coordinate for warping the minimum potential energy principal variational equation
暂未订购 下载PDF
一种基于warping变换的浅海脉冲声源被动测距方法 认领 引用 被引量：17
10
作者 王冬 郭良浩 +1 位作者 刘建军 戚聿波 《物理学报》 SCIE EI CAS CSCD 北大核心 2016年第10期138-146,共9页
针对浅海波导中脉冲声源被动测距问题,提出了一种利用接收信号的能量密度函数进行warping变换的声源被动测距方法.对于浅海波导,接收信号的能量密度函数中不同号简正波相干部分,经warping变换后输出结果的频谱中包含与声源和接收器位置... 针对浅海波导中脉冲声源被动测距问题,提出了一种利用接收信号的能量密度函数进行warping变换的声源被动测距方法.对于浅海波导,接收信号的能量密度函数中不同号简正波相干部分,经warping变换后输出结果的频谱中包含与声源和接收器位置无关的不变性频率特征.这些特征频率在数值上等于理想波导中相干的两号简正波的截止频率差,与海底参数无关,因此仅需已知海水中的平均声速和海水深度便可计算出特征频率值.当声源距离未知时,利用特征频率的提取值与真实特征频率之间的关系可以实现快速测距,极大地提高了计算速度.为了验证方法的有效性,对2011年11月黄海海域水声实验的接收脉冲数据进行了处理,测距结果与实测距离符合良好,平均测距误差在8%以内. 展开更多
关键词 浅海 被动测距 warping变换 能量密度函数
暂未订购 下载PDF
warping变换提取单模态反演海底衰减系数 认领 引用 被引量：8
11
作者 李佳蔚 鹿力成 +1 位作者 郭圣明 马力 《物理学报》 SCIE EI CAS CSCD 北大核心 2017年第20期122-129,共8页
为了获得浅海海底地声模型参数,利用warping变换方法分离出单模态简正波.对于接收深度固定、定深爆炸声源情况,以简正波理论为基础定义了距离归一化的简正波传播损失,并且其随传播的距离呈线性关系,故可通过此变化规律得到声压值实部的... 为了获得浅海海底地声模型参数,利用warping变换方法分离出单模态简正波.对于接收深度固定、定深爆炸声源情况,以简正波理论为基础定义了距离归一化的简正波传播损失,并且其随传播的距离呈线性关系,故可通过此变化规律得到声压值实部的衰减因子,进而可求得海底地声模型参数:海底衰减系数.为验证此方法的有效性,仿真了warping变换提取单模态简正波的过程,同时将warping变换提取的单模态简正波与数值计算的结果进行比较验证;并针对某次黄海试验数据进行了处理,得到在150—550 Hz频带范围内海底衰减随频率的变化规律为α=0.581f_k1.86(dB/m).通过与其他学者在相同海域试验结果的对比验证,变化规律基本相同.此外不同模态间反演相同频点的衰减系数接近也较好地支撑了结果. 展开更多
关键词 warping变换 模态提取 曲线拟合 海底衰减
暂未订购 下载PDF
一种基于双引导声源和warping变换的拷贝声场计算方法 认领 引用 被引量：6
12
作者 姚美娟 鹿力成 +1 位作者 马力 郭圣明 《声学学报》 EI CAS CSCD 北大核心 2016年第1期73-80,共8页
提出了在均匀浅海环境中只知道少量环境参数的情况下，利用不同距离上的两枚引导声源和warping变换的拷贝声场计算方法。这种方法主要基于简正波估计技术，从声场衰减信息和相位信息两个方向来重构拷贝声场，从而与目标声场匹配进行定... 提出了在均匀浅海环境中只知道少量环境参数的情况下，利用不同距离上的两枚引导声源和warping变换的拷贝声场计算方法。这种方法主要基于简正波估计技术，从声场衰减信息和相位信息两个方向来重构拷贝声场，从而与目标声场匹配进行定位。其优点在于能避免传统的匹配场定位技术中拷贝场计算时对环境模型和环境参数的依赖。在简正波估计技术中采用warping变换的处理方式，数值仿真主要采用线性Bartlett匹配处理器分析了目标定位效果，在信噪比高于10-15dB的情况下，定位效果良好。 展开更多
关键词 warping 声场计算 双引导 拷贝 声源 定位技术 环境参数 相位信息
暂未订购 下载PDF
利用自相关函数warping变换的浅海声源深度判别 认领 引用 被引量：11
13
作者 刘志韬 郭良浩 闫超 《声学学报》 EI CAS CSCD 北大核心 2019年第1期28-38,共11页
针对浅海波导声源深度判别问题,提出了一种利用warping变换提取接收信号简正波相关项的深度判别方法。对接收信号自相关函数做warping变换,分离其简正波相关项,利用能量占主导的简正波相关项特征频率之间的比例关系,确定其号数,从而分... 针对浅海波导声源深度判别问题,提出了一种利用warping变换提取接收信号简正波相关项的深度判别方法。对接收信号自相关函数做warping变换,分离其简正波相关项,利用能量占主导的简正波相关项特征频率之间的比例关系,确定其号数,从而分辨水面声源和水下声源。公式推导和数值仿真结果说明:不同深度声源激发的能量占主导的简正波相关项特征频率不同,可以用于判别声源深度。海试实验结果证明:在海水声速随深度不变或缓变的水文环境,低频条件下,该方法可以分离简正波相关项并确定其号数,在未知声源距离的情况下有效进行声源深度判别,且无须声源相对接收器运动。 展开更多
关键词 warping 水下声源 判别方法 自相关函数 浅海 接收信号 特征频率 比例关系
暂未订购 下载PDF
浅海负跃层条件下的warping变换宽带无源测距方法 认领 引用 被引量：8
14
作者 王冬 郭良浩 刘建军 《声学学报》 EI CAS CSCD 北大核心 2019年第2期145-154,共10页
夏季浅海波导中常常存在强烈的负跃层,研究warping变换无源测距在这种水文条件下的使用方法具有重要的应用价值。对于上发上收、上发下收和跃层强度较小时下发下收的情况,海面海底反射类简正波对声场起主要作用,可以对接收信号的自相关... 夏季浅海波导中常常存在强烈的负跃层,研究warping变换无源测距在这种水文条件下的使用方法具有重要的应用价值。对于上发上收、上发下收和跃层强度较小时下发下收的情况,海面海底反射类简正波对声场起主要作用,可以对接收信号的自相关函数进行时域warping变换,利用特征频率匹配的方法进行无源测距。而对于跃层强度较大时下发下收的情况,水体折射-海底反射类简正波对声场起主要贡献,可以对接收信号的自相关函数进行频域β-warping变换进行无源测距。并且能在事先获得粗略的水体声速剖面参数的情况下,通过设置一个已知距离的引导声源,那么即使估计得到的波导不变量存在一定误差,实际测距结果也可以与真实距离符合得较好。利用warping变换对一次夏季浅海实验接收到的目标发出的宽带信号进行无源测距,估计距离与真实距离符合较好,相对误差在20%以内。 展开更多
关键词 简正波 自相关函数 负跃层 warping 海底反射 无源测距 波导不变量 接收信号 声速剖面 浅海波导
暂未订购 下载PDF
Doppler-warping变换及其应用在声学目标运动速度估计 认领 引用 被引量：5
15
作者 高德洋 高大治 +2 位作者 迟静 王良 宋文华 《物理学报》 SCIE EI CAS CSCD 北大核心 2021年第12期104-111,共8页
当声源和接收器之间存在相对运动时,接收到的信号会发生多普勒频移,多普勒频移和目标运动参数有关.针对声学多普勒频移问题提出Doppler-warping变换,运用该变换可以实现多普勒信号相位的线性化,推导出warping算子,提出一种利用该变换估... 当声源和接收器之间存在相对运动时,接收到的信号会发生多普勒频移,多普勒频移和目标运动参数有关.针对声学多普勒频移问题提出Doppler-warping变换,运用该变换可以实现多普勒信号相位的线性化,推导出warping算子,提出一种利用该变换估计目标运动参数的算法.首先构造不同运动参数下的Doppler-warping算子,再利用算子对接收的时域信号进行时间重采样,然后求出变换之后信号的频谱函数,最后利用频谱函数熵最小来实现目标参数估计.仿真结果证明了该方法的有效性,对于低信噪比的海试数据,渔船真实速度为4.5 m/s,采用传统的最小均方误差(MMSE)速度估计方法得到的结果为5.2 m/s,误差达到15.56%,本文提出的Doppler-warping变换方法较为准确地估计了目标运动速度,估计结果为4.7 m/s,误差为4.44%. 展开更多
关键词 多普勒效应 warping变换 目标运动速度估计
暂未订购 下载PDF
Time-Lapse Full-Waveform Inversion Using Cross-Correlation-Based Dynamic Time Warping 认领 引用 被引量：3
16
作者 Jianhua Wang Qingping Li +1 位作者 Shouwei Zhou Yufa He 《哈尔滨工程大学学报（英文版）》 CSCD 2024年第3期634-644,共11页
Offshore carbon capture, utilization, and storage(OCCUS) is regarded as a crucial technology for mitigating greenhouse gas emissions.Quantitative monitoring maps of sealed carbon dioxide are necessary in a comprehensi... Offshore carbon capture, utilization, and storage(OCCUS) is regarded as a crucial technology for mitigating greenhouse gas emissions.Quantitative monitoring maps of sealed carbon dioxide are necessary in a comprehensive OCCUS project. A potential high-resolution method for the aforementioned purpose lies in the full-waveform inversion(FWI) of time-lapse seismic data. However, practical applications of FWI are severely restricted by the well-known cycle-skipping problem. A new time-lapse FWI method using cross-correlation-based dynamic time warping(CDTW) is proposed to detect changes in the subsurface property due to carbon dioxide(CO2) injection and address the aforementioned issue. The proposed method, namely CDTW, which combines the advantages of cross-correlation and dynamic time warping, is employed in the automatic estimation of the discrepancy between the seismic signals simulated using the baseline/initial model and those acquired. The proposed FWI method can then back-project the estimated discrepancy to the subsurface space domain, thereby facilitating retrieval of the induced subsurface property change by taking the difference between the inverted baseline and monitor models. Numerical results on pairs of signals prove that CDTW can obtain reliable shifts under amplitude modulation and noise contamination conditions. The performance of CDTW substantially outperforms that of the conventional dynamic time warping method. The proposed time-lapse fullwaveform inversion(FWI) method is applied to the Frio-2 CO2 storage model. The baseline and monitor models are inverted from the corresponding time-lapse seismic data. The changes in velocity due to CO2 injection are reconstructed by the difference between the baseline and the monitor models. 展开更多
关键词 Full-waveform inversion Dynamic time warping Ocean carbon dioxide storage monitoring Discrepancy estimation Model test
暂未订购 下载PDF
浅海波导中折射类简正波的warping变换 认领 引用 被引量：4
17
作者 戚聿波 周士弘 张仁和 《物理学报》 SCIE EI CAS CSCD 北大核心 2016年第13期163-171,共9页
Warping变换可以实现单水听器浅海低频声波导的简正波分离.本文讨论了海水声速随深度线性减小浅海波导中折射类简正波的warping变换.理论推导了海水折射类简正波水平波数、频域相位及瞬时相位的表达式,由此提出了相应的时域和频域warpin... Warping变换可以实现单水听器浅海低频声波导的简正波分离.本文讨论了海水声速随深度线性减小浅海波导中折射类简正波的warping变换.理论推导了海水折射类简正波水平波数、频域相位及瞬时相位的表达式,由此提出了相应的时域和频域warping变换算子,并由仿真数据进行了验证.本文的理论推导过程同样适用于海水声速线性增大或海水折射系数的平方随深度线性变化的浅海波导. 展开更多
关键词 warping变换 简正波分离 折射类简正波
暂未订购 下载PDF
Method of Time Series Similarity Measurement Based on Dynamic Time Warping 认领 引用 被引量：4
18
作者 Lianggui Liu Wei Li Huiling Jia 《Computers, Materials & Continua》 SCIE EI 2018年第10期97-106,共10页
With the rapid development of mobile communication all over the world,the similarity of mobile phone communication data has received widely attention due to its advantage for the construction of smart cities.Mobile ph... With the rapid development of mobile communication all over the world,the similarity of mobile phone communication data has received widely attention due to its advantage for the construction of smart cities.Mobile phone communication data can be regarded as a type of time series and dynamic time warping(DTW)and derivative dynamic time warping(DDTW)are usually used to analyze the similarity of these data.However,many traditional methods only calculate the distance between time series while neglecting the shape characteristics of time series.In this paper,a novel hybrid method based on the combination of dynamic time warping and derivative dynamic time warping is proposed.The new method considers not only the distance between time series,but also the shape characteristics of time series.We demonstrated that our method can outperform DTW and DDTW through extensive experiments with respect to cophenetic correlation. 展开更多
关键词 Time series PCA dimensionality reduction dynamic time warping hierarchical clustering cophenetic correlation
暂未订购 下载PDF
Partition of GB-InSAR deformation map based on dynamic time warping and k-means 认领 引用 被引量：3
19
作者 TIAN Weiming DU Lin +1 位作者 DENG Yunkai DONG Xichao 《Journal of Systems Engineering and Electronics》 SCIE CSCD 2022年第4期907-915,共9页
Ground-based interferometric synthetic aperture radar(GB-InSAR)can take deformation measurement with a high accuracy.Partition of the GB-InSAR deformation map benefits analyzing the deformation state of the monitoring... Ground-based interferometric synthetic aperture radar(GB-InSAR)can take deformation measurement with a high accuracy.Partition of the GB-InSAR deformation map benefits analyzing the deformation state of the monitoring scene better.Existing partition methods rely on labelled datasets or single deformation feature,and they cannot be effectively utilized in GBInSAR applications.This paper proposes an improved partition method of the GB-InSAR deformation map based on dynamic time warping(DTW)and k-means.The DTW similarities between a reference point and all the measurement points are calculated based on their time-series deformations.Then the DTW similarity and cumulative deformation are taken as two partition features.With the k-means algorithm and the score based on multi evaluation indexes,a deformation map can be partitioned into an appropriate number of classes.Experimental datasets of West Copper Mine are processed to validate the effectiveness of the proposed method,whose measurement points are divided into seven classes with a score of 0.3151. 展开更多
关键词 ground-based interferometric synthetic aperture radar(GB-InSAR) deformation map partition dynamic time warping(DTW) k-means
暂未订购 下载PDF
A passive source ranging method based on the frequency warping transform of the vertical intensity flux in shallow water 认领 引用 被引量：1
20
作者 Yu-Bo Qi Shi-Hong Zhou +3 位作者 Meng-Xiao Yu Shu-Yuan Du Mei Sun Ren-He Zhang 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第5期145-149,共5页
The phase of cross-correlation function of two different normal modes contains source range information, which can be extracted by warping transform due to the dispersive characteristics of the shallow water waveguide... The phase of cross-correlation function of two different normal modes contains source range information, which can be extracted by warping transform due to the dispersive characteristics of the shallow water waveguide. The autocorrelation function of the received pressure or particle velocity contains both modal autocorrelation component(MAC) and modal cross-correlation component(MCC), with the former part usually treated as interference for source ranging. Because the real part of the vertical intensity flux(RPVIF) only contains MCC, a passive impulsive source ranging method based on the frequency warping transform of RPVIF with a single vector receiver in shallow water is presented. Using a waveguide-invariant-based frequency warping operator, the cross-correlation components of two different modes in the vertical intensity flux are warped into separable impulsive sequences, the time delays of which are subsequently used for source ranging. The advantages of source ranging based on warping the vertical intensity flux compared with warping the pressure autocorrelation function are pointed out, and the experiment results are also presented. 展开更多
关键词 passive source ranging vertical intensity flux frequency warping transform normal mode
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 17 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈