OCEANS 2010 MTS/IEEE SEATTLE最新文献_第3页

Computational studies of time-varying three-dimensional acoustic propagation in canyon and slope regions 峡谷和斜坡区时变三维声传播的计算研究

OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5664419

T. Duda, Ying-Tsong Lin, A. Newhall, W. G. Zhang, J. Lynch

引用次数: 4

Underwater ordnance classification using Time-Frequency signatures of backscattering signals 基于后向散射信号时频特征的水下军械分类

OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5664264

H. Ou, W. Au, V. Syrmos

引用次数: 8

NLOS identification using a hybrid ToA-signal strength algorithm for underwater acoustic localization 基于混合toa信号强度算法的水声定位NLOS识别

OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5664483

R. Diamant, H. Tan, L. Lampe

引用次数: 14

Passive acoustic monitoring during the SIRENA 10 cetacean survey SIRENA - 10鲸类调查中的被动声学监测

OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5664597

D. Hughes, J. Sildam, A. B-Nagy, K. Ryan, J. Haun

引用次数: 8

Development of a deep-sea chemical analyzer for in-situ anion measurement 深海阴离子原位测量化学分析仪的研制

OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5664423

W. Bangchun, Peng Xiaotong, Zhou Huaiyang, X. Yunshi, Lv Feng, Wu Zhengwei

引用次数: 1

Initial results in underwater single image dehazing 初步结果在水下单幅图像去雾

OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5664428

Nicholas Carlevaris-Bianco, A. Mohan, R. Eustice

引用次数: 353

Implications of signal intensity fluctuations on vector sensor array processing 信号强度波动对矢量传感器阵列处理的影响

OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5663783

D. Dall'Osto, P. Dahl

引用次数: 3

Performance study of variable-rate modulation for underwater communications based on experimental data 基于实验数据的水下通信变速率调制性能研究

OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5664467

B. Tomasi, L. Toni, P. Casari, L. Rossi, M. Zorzi

{"title":"Performance study of variable-rate modulation for underwater communications based on experimental data","authors":"B. Tomasi, L. Toni, P. Casari, L. Rossi, M. Zorzi","doi":"10.1109/OCEANS.2010.5664467","DOIUrl":"https://doi.org/10.1109/OCEANS.2010.5664467","url":null,"abstract":"In this paper, we present an analysis of the performance of a variable-rate adaptive modulation system based on instantaneous SNR information. The SNR traces we consider are part of the SubNet'09 experimental dataset, and have been derived by processing an hyperbolic frequency-modulated signal in the 9-14 kHz band. We start by deriving the high level behavior of the channel in terms of the statistics of channel fading effects, which are found to be well modeled by a Nakagami-m distribution, where the parameter m is estimated over a whole experiment or over smaller time windows throughout the experiment, depending on the variability of the SNR. The statistics of the channel behavior are then used to derive the performance of a variable-rate modulation scheme switching between five different constellations; the cases of both instantaneous and outdated channel knowledge are considered. Analytical results are compared to simulations to show that the Nakagami-m distribution can satisfactorily capture the statistics of the channel, provided that the estimation of the m parameter, as well as of the correlation of the SNR process, is repeated in case of macroscopic channel variations.","PeriodicalId":363534,"journal":{"name":"OCEANS 2010 MTS/IEEE SEATTLE","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115348268","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: 22

Covert underwater acoustic communications: Transceiver structures, waveform designs and associated performances 隐蔽水声通信:收发器结构、波形设计和相关性能

OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5663840

Jun Ling, Hao He, Jian Li, W. Roberts, P. Stoica

{"title":"Covert underwater acoustic communications: Transceiver structures, waveform designs and associated performances","authors":"Jun Ling, Hao He, Jian Li, W. Roberts, P. Stoica","doi":"10.1109/OCEANS.2010.5663840","DOIUrl":"https://doi.org/10.1109/OCEANS.2010.5663840","url":null,"abstract":"Covert communications are conducted at a low received signal-to-noise ratio (SNR) to prevent interception or detection by an eavesdropper, and successful detection in this particular area heavily relies on the processing gain achieved by employing the direct-sequence spread-spectrum (DSSS) technique. If covert communications take place in underwater acoustic (UWA) environments, then additional challenges are present. UWA channels are time-varying in nature, which could preclude an accurate channel estimation at low SNR. Furthermore, UWA environments are frequency-selective with long-memory channels, which imposes challenges to the design of the spreading waveform. In this paper, we investigate covert UWA communications from a noncoherent perspective. Two modulation schemes are addressed, namely, binary orthogonal modulation and binary differential phase-shift keying (DPSK). Both schemes are coupled with the DSSS technique and a RAKE receiver. The employed spreading waveforms not only account for the transceiver structure and frequency-selective nature of the UWA channel, but also serve to protect the privacy of the transmitted information. The effectiveness of the proposed methods is verified by numerical examples.","PeriodicalId":363534,"journal":{"name":"OCEANS 2010 MTS/IEEE SEATTLE","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115674711","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: 18

Effects of fiber rope complex stiffness behavior on mooring line tensions with large vessels moored in waves 波浪中大型船舶系泊时纤维绳复合刚度特性对系泊索张力的影响

OCEANS 2010 MTS/IEEE SEATTLE Pub Date : 2010-12-10 DOI: 10.1109/OCEANS.2010.5663801

S. Banfield, J. Flory

{"title":"Effects of fiber rope complex stiffness behavior on mooring line tensions with large vessels moored in waves","authors":"S. Banfield, J. Flory","doi":"10.1109/OCEANS.2010.5663801","DOIUrl":"https://doi.org/10.1109/OCEANS.2010.5663801","url":null,"abstract":"At terminals exposed to waves, the first-order wave-induced vessel motions can cause very high mooring line load ranges and peak tensions which can result in excessive mooring line fatigue and breakouts. These effects can be alleviated by proper selection of fiber rope materials and lengths for mooring lines and tails. Fiber rope stiffness characteristics are complex. The broken-in rope stiffness is suitable for calculating mooring line tensions with constant wind and current forces. But wave-induced vessel motions can cause cyclic tensioning and increase the peak mooring line tension. While the rope is cycling, it becomes stiffer. The cycling stiffness of the rope is greater than its brokenin stiffness. This cycling stiffness should be used when calculating the peak mooring line tensions caused by wave-induced vessel motions. This paper describes the complex axial stiffness behavior of synthetic fiber ropes. It explains how rope stiffness increases during cycling. It demonstrates how the rope cycling stiffness can significantly increase peak mooring line tensions in wave environments. Recorded mooring line load data was available from an exposed terminal where both nylon and polyester tails are compared with loads calculated by the Optimoor Seakeeping mooring analysis computer program. When the rope cycling stiffness was used instead of its broken-in stiffness, good agreement was achieved between the measured and the calculated peak wavemotion-induced mooring loads. This paper will be of interest to fiber rope engineers, mooring operators and mooring system designers.","PeriodicalId":363534,"journal":{"name":"OCEANS 2010 MTS/IEEE SEATTLE","volume":"184 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114604444","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