检索结果-内蒙古大学图书馆

Reconstruction of time series with missing value using 2D representation-based denoising autoencoder

Journal of Systems Engineering and Electronics 2020年第6期31卷 1087-1096页

作者： TAO Huamin DENG Qiuqun XIAO Shanzhu National Key Laboratory of Science and Technology on Automatic Target Recognition College of Electronic ScienceNational University of Defense TechnologyChangsha 410073China

Time series analysis is a key technology for medical diagnosis,weather forecasting and financial prediction ***,missing data frequently occur during data recording,posing a great challenge to data mining *** this study,we propose a novel time series data representation-based denoising autoencoder(DAE)for the reconstruction of missing *** data representation methods,namely,recurrence plot(RP)and Gramian angular field(GAF),are used to transform the raw time series to a 2D matrix for establishing the temporal correlations between different time intervals and extracting the structural patterns from the time *** an improved DAE is proposed to reconstruct the missing values from the 2D representation of time series.A comprehensive comparison is conducted amongst the different representations on standard *** show that the 2D representations have a lower reconstruction error than the raw time series,and the RP representation provides the best *** work provides useful insights into the better reconstruction of missing values in time series analysis to considerably improve the reliability of timevarying system.

关键词： time series missing value 2D representation denoising autoencoder(DAE) reconstruction

来源：评论

学校读者我要写书评

暂无评论

Reflection separation technology based on polarization characteristics

引用

Journal of Systems Engineering and Electronics 2022年第5期33卷 1032-1042页

作者： ZHANG Yan ZHANG Jinghua SHI Zhiguang ZHANG Yu LING Feng National Key Laboratory of Science and Technology on Automatic Target Recognition College of Electronic Science and EngineeringNational University of Defense TechnologyChangsha 410073China

Specific to the reflected light problem on the surface of transparent body,the polarization characteristics of the reflection region are analyzed,and a polarization characterization model combining the reflection and transmission effects is *** the basis of the polarization characteristic analysis,the minimum value of normalized cross-correlation(NCC)coefficient between transmission and reflection images is solved through the gradient descent method,and their polarization degrees under the minimum correlation are *** to the distribution relations of the transmitted and reflected lights in perpendicular and parallel directions,reflection separation is realized via the polarized orthogonality difference algorithm based on the degree of reflection polarization and the degree of transmission polarization.

关键词： reflection separation transparent object correlation polarization characteristics

来源：评论

学校读者我要写书评

暂无评论

Range anomaly suppression based on neighborhood pixels detection in ladar range images

引用

Journal of Systems Engineering and Electronics 2013年第1期24卷 68-75页

作者： Mingbo Zhao Jun He Zaiqi Lu Qiang Fu Automatic Target Recognition Key Laboratory School of Electronic Science and EngineeringNational University of Defense Technology No.93246 Troop of the PLA

Research on the range anomaly suppression algorithm in laser radar （ladar） range images is significant in the application and development of ladar. But most of existing algorithms cannot protect the edge and linear target well while suppressing the range anomaly. Aiming at this problem, the differences among the edge, linear target, and range anomaly are analyzed and a novel algo- rithm based on neighborhood pixels detection is proposed. Firstly, the range differences between current pixel and its neighborhood pixels are calculated. Then, the number of neighborhood pixels is detected by the range difference threshold. Finally, whether the current pixel is a range anomaly is distinguished by the neighbor- hood pixel number threshold. Experimental results show that the new algorithm not only has a better range anomaly suppression performance and higher efficiency, but also protects the edge and linear target preferably compared with other algorithms.

关键词： image processing range anomaly suppression neigh-borhood p xe s detection linear target laser radar (ladar).

来源：评论

学校读者我要写书评

暂无评论

A Wideband Reconnaissance Receiver Design based on Real-time Spectrum Analysis technology 2

A Wideband Reconnaissance Receiver Design based on Real-time...

引用

2017 IEEE 第2届先进信息技术,电子与自动化控制国际会议(IAEAC 2017)

作者： Tao Li Zengping Chen Science and Technology on Automatic Target Recognition Laboratory National University of Defense Technology

The technology of wideband real-time spectrum analysis(RTSA) technology focus on the effective discovery, capture and detection of signal with large bandwidth and complex modulation. In this paper, so

ISBN: (纸本)9781467389808

关键词： Receivers Real-time systems Wideband Reconnaissance Field programmable gate arrays Time-frequency analysis

来源：评论

学校读者我要写书评

暂无评论

A hybrid integration method of frequency agile radar for uniform moving target 2

A hybrid integration method of frequency agile radar for uni...

引用

2017 IEEE 第2届先进信息技术,电子与自动化控制国际会议(IAEAC 2017)

作者： Ruiqi Tian Caiyong Lin Qinglong Bao Zengping Chen Science and Technology on Automatic Target Recognition Laboratory National University of Defense Technology

Frequency agility(FA) is one of the important techniques in radar systems for the superiority in radar range, glint reduction, electronic counter-countermeasures and so on. However, frequency agility

ISBN: (纸本)9781467389808

Frequency agility(FA) is one of the important techniques in radar systems for the superiority in radar range, glint reduction, electronic counter-countermeasures and so on. However, frequency agility

关键词： Transforms Trajectory Radar cross-sections Doppler effect Signal to noise ratio Fitting

来源：评论

学校读者我要写书评

暂无评论

A New Modulation Format of Hybrid Control of Bandwidth and Duration to Compensate Range Migrations 2

A New Modulation Format of Hybrid Control of Bandwidth and D...

引用

2017 IEEE 第2届先进信息技术,电子与自动化控制国际会议(IAEAC 2017)

作者： Sen Wang Caiyong Lin Qinglong Bao Zengping Chen Science and Technology on Automatic Target Recognition Laboratory National University of Defense Technology

Long-time coherent pulse integration method has been extensively used in detecting weak targets, but the detection performance is affected by range migration due to high radial velocity. This paper pr

ISBN: (纸本)9781467389808

关键词： Long-time coherent integration Range migration Bandwidth Duration Hybrid control hybrid control Bandwidth Migrations Distance resolution

来源：评论

学校读者我要写书评

暂无评论

An Efficient TO-MHT Algorithm for Multi-target Tracking in Cluttered Environment 2

An Efficient TO-MHT Algorithm for Multi-Target Tracking in C...

引用

2017 IEEE 第2届先进信息技术,电子与自动化控制国际会议(IAEAC 2017)

作者： ShengSen Pan Qinglong Bao Zengping Chen Science and Technology on Automatic Target Recognition Laboratory National University of Defense Technology

In radar system, data association and state estimation are two main principles for tracking multiple targets in cluttered environment. TO-MHT(Track-Oriented Multiple Hypothesis Tracking) is a well kno

ISBN: (纸本)9781467389808

关键词： Radar tracking target tracking Algorithm design and analysis Current measurement Probability Clustering algorithms

来源：评论

学校读者我要写书评

暂无评论

Three-dimensional positions of scattering centers reconstruction from multiple SAR images based on radargrammetry

引用

Journal of Central South University 2015年第5期22卷 1776-1789页

作者：钟金荣文贡坚回丙伟李德仁 Science and Technology on Automatic Target Recognition Laboratory National University of Defense Technology Key Laboratory of Remote Sensing and Information Engineering Remote Sensing Information Engineering College of Wuhan University

A method and procedure is presented to reconstruct three-dimensional(3D) positions of scattering centers from multiple synthetic aperture radar(SAR) images. Firstly, two-dimensional(2D) attribute scattering centers of targets are extracted from 2D SAR images. Secondly, similarity measure is developed based on 2D attributed scatter centers' location, type, and radargrammetry principle between multiple SAR images. By this similarity, we can associate 2D scatter centers and then obtain candidate 3D scattering centers. Thirdly, these candidate scattering centers are clustered in 3D space to reconstruct final 3D positions. Compared with presented methods, the proposed method has a capability of describing distributed scattering center, reduces false and missing 3D scattering centers, and has fewer restrictionson modeling data. Finally, results of experiments have demonstrated the effectiveness of the proposed method.

关键词： multiple synthetic aperture radar(SAR) images three-dimensional scattering center position reconstruction radargrammetry

来源：评论

学校读者我要写书评

暂无评论

Design and implementation of the optical fiber control and transmission module in multi-channel broadband digital receiver

引用

Optoelectronics Letters 2014年第5期10卷 369-373页

作者：赵英潇张月范立杰李卫星陈曾平 State Key Laboratory of Automatic Target Recognition National University of Defense Technology

An optical fiber control and transmission module is designed and realized based on Virtex-7 field programmable gata array(FPGA), which can be applied in multi-channel broadband digital receivers. The module consists of sampling data transfer submodule and multi-channel synchronous sampling control submodule. The sampling data transmission in 4× fiber link channel is realized with the self-defined transfer protocol. The measured maximum data rate is 4.97 Gbyte/s. By connecting coherent clocks to the transmitter and receiver endpoints and using the self-defined transfer protocol, multi-channel sampling control signals transferred in optical fibers can be received synchronously by each analog-to-digital converter(ADC) with high accuracy and strong anti-interference ability. The module designed in this paper has certain reference value in increasing the transmission bandwidth and the synchronous sampling accuracy of multi-channel broadband digital receivers.

关键词： Analog to digital conversion Data transfer Field programmable gate arrays (FPGA) Light transmission

来源：评论

学校读者我要写书评

暂无评论

RECURRENT NEURAL NETWORK FOR HIGH-RESOLUTION RADAR SHIP target recognition

RECURRENT NEURAL NETWORK FOR HIGH-RESOLUTION RADAR SHIP TARG...

引用

1996 CIE International Conference of Radar(ICR’96)

作者： Wang Feixue Yu Wenxian Guo Guirong Automatic Target Recognition Laboratory National University of Defense Technology

ISBN: (纸本)0780329147

The high-resolution radar waveform describes the amplitude of targets' multiple scattering centers and their distribution in the radial *** view from time domain,target waveform can also be regarded as a time sequence such that it can be classified using recurrent neural networks(RNN)which are suitable for time sequence processing.A modified partially RNN and its algorithm are *** method reaches above 90%average recognition rate for 8 class high-resolution radar targets,and it is tolerant of time shift to a certain degree.

关键词： target recognition recurrent neural network sequence recognition ship target high resolution

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：