发布求助
文献互助 智能选刊 最新文献

2015 International Symposium on Ocean Electronics (SYMPOL)最新文献

筛选
英文 中文
Development of directivity measurement system for underwater acoustic transducers 水声换能器指向性测量系统的研制
2015 International Symposium on Ocean Electronics (SYMPOL) Pub Date : 2015-11-01 DOI: 10.1109/SYMPOL.2015.7581170
P. S. Sridhar, A. Malarkodi, K. Nithyanandam, G. Latha
{"title":"Development of directivity measurement system for underwater acoustic transducers","authors":"P. S. Sridhar, A. Malarkodi, K. Nithyanandam, G. Latha","doi":"10.1109/SYMPOL.2015.7581170","DOIUrl":"https://doi.org/10.1109/SYMPOL.2015.7581170","url":null,"abstract":"Directivity is the response of an electro acoustic transducer as a function of direction of the transmitted or incident acoustic wave in specified plane and at specified frequency [1]. Directivity pattern is a graphical description usually in polar coordinates [1]. This paper describes the establishment of directivity measurement system for an underwater electro-acoustic transducer. Motion controller in combination with the servo system is used to control the positioning of the transducer mounting mechanism and PXIe 6124-8 channel data acquisition system of National Instruments is used for data acquisition and analysis. LabVIEW programming is used for interface, control and recording data.","PeriodicalId":127848,"journal":{"name":"2015 International Symposium on Ocean Electronics (SYMPOL)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129997687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Sonar image denoising using adaptive processing of local patches 声纳图像局部补丁自适应去噪
2015 International Symposium on Ocean Electronics (SYMPOL) Pub Date : 2015-11-01 DOI: 10.1109/SYMPOL.2015.7581165
Rithu James, M. Supriya
{"title":"Sonar image denoising using adaptive processing of local patches","authors":"Rithu James, M. Supriya","doi":"10.1109/SYMPOL.2015.7581165","DOIUrl":"https://doi.org/10.1109/SYMPOL.2015.7581165","url":null,"abstract":"Sonar images are highly affected by signal-dependent multiplicative speckle noise. Denoising is required in sonar images to distinguish a number of different regions by analyzing the image. In this paper, we propose sonar image denoising based on a signal independent additive Gaussian noise model. The sparse representation of the sonar images is exploited in the denoising method. The noisy image, image patches and blocks of patches are denoised using Principal Component Analysis and Singular Value Decomposition methods. Comparison of different methods is done using different non reference image performance evaluation criteria.","PeriodicalId":127848,"journal":{"name":"2015 International Symposium on Ocean Electronics (SYMPOL)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125812169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Performance analysis of linear recursive least squares adaptive filter to mitigate multipath effect 线性递推最小二乘自适应滤波器抑制多径效应的性能分析
2015 International Symposium on Ocean Electronics (SYMPOL) Pub Date : 2015-11-01 DOI: 10.1109/SYMPOL.2015.7581161
N. Sireesha, K. Chithra, T. Sudhakar
{"title":"Performance analysis of linear recursive least squares adaptive filter to mitigate multipath effect","authors":"N. Sireesha, K. Chithra, T. Sudhakar","doi":"10.1109/SYMPOL.2015.7581161","DOIUrl":"https://doi.org/10.1109/SYMPOL.2015.7581161","url":null,"abstract":"The paper discusses the design, simulation and performance analysis of an adaptive filter based on Recursive Least Squares (RLS) algorithm with the main focus on mitigating the effect of multipath. The underwater acoustic channels are characterized by time-varying multipath propagation with large delay spreads which introduces severe intersymbol interference which can be equalized with the use of an adaptive filter. The filter behaviour is studied by simulating the multipath channel characteristics. The paper also analyzes the performance of the designed RLS adaptive filter in comparison to its Least Mean Square (LMS) counterpart.","PeriodicalId":127848,"journal":{"name":"2015 International Symposium on Ocean Electronics (SYMPOL)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125814793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Experimental observation of direction-of-arrival (DOA) estimation algorithms in a tank environment for sonar application 声纳坦克环境下到达方向估计算法的实验观察
2015 International Symposium on Ocean Electronics (SYMPOL) Pub Date : 2015-11-01 DOI: 10.1109/SYMPOL.2015.7581173
Sayanti Bardhan, Shibu Jacob
{"title":"Experimental observation of direction-of-arrival (DOA) estimation algorithms in a tank environment for sonar application","authors":"Sayanti Bardhan, Shibu Jacob","doi":"10.1109/SYMPOL.2015.7581173","DOIUrl":"https://doi.org/10.1109/SYMPOL.2015.7581173","url":null,"abstract":"This paper focuses on the performance of Multiple Signal Classification (MUSIC) and Estimation of Signal Parameters by Rotational Invariance techniques (ESPRIT) algorithm in real-time, for detection of underwater object by active sonar system of frequency 12 kHz. Experiment is conducted in Acoustic tank facility (ATF) at National Institute of Ocean Technology (NIOT). A table with dimension of 0.5mx0.5m is submerged in the tank at a depth of 3.6m from the water surface. A tow body with acoustic transmitter and hydrophone array is used to transmit and receive the acoustic signal in tank. The DOA estimation gives the exact location of the table in the tank. It is observed that the location of the submerged table computed by MUSIC & ESPRIT is comparable with a bias of about 1 degree.","PeriodicalId":127848,"journal":{"name":"2015 International Symposium on Ocean Electronics (SYMPOL)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114798674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Experimental result for direction of arrival (DOA) estimation using under water acoustic vector sensor. 基于水声矢量传感器的到达方向估计实验结果。
2015 International Symposium on Ocean Electronics (SYMPOL) Pub Date : 2015-11-01 DOI: 10.1109/SYMPOL.2015.7581174
K. Kiran, S. Najeem, G. Latha
{"title":"Experimental result for direction of arrival (DOA) estimation using under water acoustic vector sensor.","authors":"K. Kiran, S. Najeem, G. Latha","doi":"10.1109/SYMPOL.2015.7581174","DOIUrl":"https://doi.org/10.1109/SYMPOL.2015.7581174","url":null,"abstract":"Acoustic vector sensor measures scalar acoustic pressure along with acoustic particle motion in three orthogonal directions. A single acoustic vector sensor provides information about the source direction than a scalar hydrophone. Thus acoustic vector sensors are widely used for many underwater acoustic applications. In this study an indigenously developed acoustic vector sensor array has been used to determine the direction of arrival in a controlled environment. Experiment has been conducted for different frequencies (1-6 kHz) and based on conventional beamforming technique DOA of the source was calculated. The experiment was repeated by changing the orientation of the vector sensor along different azimuthal directions at specific frequencies. The results obtained from the beamformer output compares well with the known source direction along the azimuth. The study clearly shows the application of underwater vector sensor in source localization and target tracking.","PeriodicalId":127848,"journal":{"name":"2015 International Symposium on Ocean Electronics (SYMPOL)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133867400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
GA based selection and parameter optimization for an SVM based underwater target classifier 基于遗传算法的支持向量机水下目标分类器选择与参数优化
2015 International Symposium on Ocean Electronics (SYMPOL) Pub Date : 2015-11-01 DOI: 10.1109/SYMPOL.2015.7581164
B. Sherin, M. Supriya
{"title":"GA based selection and parameter optimization for an SVM based underwater target classifier","authors":"B. Sherin, M. Supriya","doi":"10.1109/SYMPOL.2015.7581164","DOIUrl":"https://doi.org/10.1109/SYMPOL.2015.7581164","url":null,"abstract":"Underwater target classification is a very demanding task owing to ever changing complicated nature of the underwater communication channels. Underwater target classification system identifies targets from a mixture of underwater events by its characteristic signature. The characteristic signatures pertaining to each target are patterned by feature recognition algorithms operating on hydrophone captured data. In this paper, an SVM target classifier is used to distinguish between targets of 4 acoustic classes. The performance of the classifier is improved by automating the selection of optimal algorithmic parameters. This paper attempts towards optimal selection of SVM parameters, kernel and kernel parameters using genetic algorithm.","PeriodicalId":127848,"journal":{"name":"2015 International Symposium on Ocean Electronics (SYMPOL)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133151993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
首页 上一页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信