Pub Date : 2010-05-24DOI: 10.1109/OCEANSSYD.2010.5603542
Xinke Zhu, Jiancheng Yu, Shenzhen Ren, Xiaohui Wang
When monitoring spatial phenomena, we are not just interested in measurements at sensed locations but also at locations where no sensors were placed. To estimate the scalar field where no sensors are deployed, we need to interpolate the data. We are interested in how the best sampling design is to be found and best used to draw conclusions about the field as whole. First of all, a performance metric is defined to quantify how well the sampling network collecting data in a given region. Secondly, near-optimal collecting data strategy proposed minimizes the integral of the Kriging variance over the area of interest. Thirdly, several approaches proposed make the optimization more computationally efficient. Finally, the proposed methods are verified respectively by simulation.
{"title":"Near-optimal collecting data strategy based on ordinary Kiriging variance","authors":"Xinke Zhu, Jiancheng Yu, Shenzhen Ren, Xiaohui Wang","doi":"10.1109/OCEANSSYD.2010.5603542","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603542","url":null,"abstract":"When monitoring spatial phenomena, we are not just interested in measurements at sensed locations but also at locations where no sensors were placed. To estimate the scalar field where no sensors are deployed, we need to interpolate the data. We are interested in how the best sampling design is to be found and best used to draw conclusions about the field as whole. First of all, a performance metric is defined to quantify how well the sampling network collecting data in a given region. Secondly, near-optimal collecting data strategy proposed minimizes the integral of the Kriging variance over the area of interest. Thirdly, several approaches proposed make the optimization more computationally efficient. Finally, the proposed methods are verified respectively by simulation.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124407169","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}
Pub Date : 2010-05-24DOI: 10.1109/OCEANSSYD.2010.5603524
R. Ilin, R. Deming
We discuss a versatile framework for multiple target detection and tracking based on maximum likelihood estimation with expectation maximization and a cognitive theory called dynamic logic. In this contribution extend the framework to detection of moving objects in video sequences. The paper presents the theory and an example of detection and tracking using a real world video sequence.
{"title":"Simultaneous detection and tracking of multiple objects in noisy and cluttered environment using maximum likelihood estimation framework","authors":"R. Ilin, R. Deming","doi":"10.1109/OCEANSSYD.2010.5603524","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603524","url":null,"abstract":"We discuss a versatile framework for multiple target detection and tracking based on maximum likelihood estimation with expectation maximization and a cognitive theory called dynamic logic. In this contribution extend the framework to detection of moving objects in video sequences. The paper presents the theory and an example of detection and tracking using a real world video sequence.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127317711","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}
Pub Date : 2010-05-24DOI: 10.1109/OCEANSSYD.2010.5603879
A. Kerans, A. Kulessa, G. Woods, A. Clark
This paper presents the culmination of ten years of research into propagation inside the tropical maritime evaporation duct. The results of this research are used to develop a theoretical path design for an over ocean microwave radio system and this design is compared with results from an actual deployed system.
{"title":"A theoretical path design for long range over ocean microwave","authors":"A. Kerans, A. Kulessa, G. Woods, A. Clark","doi":"10.1109/OCEANSSYD.2010.5603879","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603879","url":null,"abstract":"This paper presents the culmination of ten years of research into propagation inside the tropical maritime evaporation duct. The results of this research are used to develop a theoretical path design for an over ocean microwave radio system and this design is compared with results from an actual deployed system.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117239315","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}
Pub Date : 2010-05-24DOI: 10.1109/oceanssyd.2010.5603807
M. Isakson, N. Chotiros
Much of the littoral region of Southern and Western Australia is composed of a soft limestone bed covered by a layer of unconsolidated sand [2]. The limestone bed, composed of calcarenite, has a high shear wave speed and there is often efficient coupling between the water born wave and the shear mode. Although studies of the effect of the elastic mode in the calcarenite on transmission loss have been undertaken, the effects of the thin sand layer and interface roughness must be quantified in order to determine a robust inversion scheme. It is found that a 1.0 m sand layer decreases the transmission loss by more than 5 dB while a 2.5 m layer can decrease the loss by as much as 20 dB. Interface roughness affects higher frequencies by increasing transmission loss and a rough interface waveguide with a sand layer can have a similar level of transmission loss as a waveguide with a bare calcarenite bottom. However, the frequency dependence and model interference patterns of the two waveguides are different. An inversion scheme based on a bare calcarenite model which would lead incorrect results.
{"title":"A finite element model of propagation on the Southern and Western Australian continental shelf","authors":"M. Isakson, N. Chotiros","doi":"10.1109/oceanssyd.2010.5603807","DOIUrl":"https://doi.org/10.1109/oceanssyd.2010.5603807","url":null,"abstract":"Much of the littoral region of Southern and Western Australia is composed of a soft limestone bed covered by a layer of unconsolidated sand [2]. The limestone bed, composed of calcarenite, has a high shear wave speed and there is often efficient coupling between the water born wave and the shear mode. Although studies of the effect of the elastic mode in the calcarenite on transmission loss have been undertaken, the effects of the thin sand layer and interface roughness must be quantified in order to determine a robust inversion scheme. It is found that a 1.0 m sand layer decreases the transmission loss by more than 5 dB while a 2.5 m layer can decrease the loss by as much as 20 dB. Interface roughness affects higher frequencies by increasing transmission loss and a rough interface waveguide with a sand layer can have a similar level of transmission loss as a waveguide with a bare calcarenite bottom. However, the frequency dependence and model interference patterns of the two waveguides are different. An inversion scheme based on a bare calcarenite model which would lead incorrect results.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117283034","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}
Pub Date : 2010-05-24DOI: 10.1109/OCEANSSYD.2010.5603674
Jian Cui, N. Kouguchi, A. Ikawa, S. Okuda, Y. Arai
It is well known that an observation of the long period gravity wave is very difficult to observe for its long period and small amplitude. In our recent research, an integrated wave remote sensing system utilizing multi-path GPS signals reflected from sea surface is proposed to measure accurate wavelength for long period gravity wave. The system is equipped with an arrayed GPS antenna that has a narrow fan beam directional pattern. It has a better performance to measure accurate wavelength than wide beam antenna in numerical simulation and it can acquire multi-path GPS signal reflected from specified sea surface in seaside experiments. In digital GPS signal processing, software GPS receiver is applied to estimate the relative time delays between multi-path GPS signals. In this paper, simulation results and seaside experiment results obtained by the wave remote sensing system are also presented.
{"title":"Wave remote sensing system by GPS","authors":"Jian Cui, N. Kouguchi, A. Ikawa, S. Okuda, Y. Arai","doi":"10.1109/OCEANSSYD.2010.5603674","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603674","url":null,"abstract":"It is well known that an observation of the long period gravity wave is very difficult to observe for its long period and small amplitude. In our recent research, an integrated wave remote sensing system utilizing multi-path GPS signals reflected from sea surface is proposed to measure accurate wavelength for long period gravity wave. The system is equipped with an arrayed GPS antenna that has a narrow fan beam directional pattern. It has a better performance to measure accurate wavelength than wide beam antenna in numerical simulation and it can acquire multi-path GPS signal reflected from specified sea surface in seaside experiments. In digital GPS signal processing, software GPS receiver is applied to estimate the relative time delays between multi-path GPS signals. In this paper, simulation results and seaside experiment results obtained by the wave remote sensing system are also presented.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130990059","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}
Pub Date : 2010-05-24DOI: 10.1109/OCEANSSYD.2010.5603541
Tomoya Inoue, K. Takagi, T. Shiosawa
Flipper type crawler system gives advantages when running on the irregular seafloor and when working on the seafloor. We developed a small size ROV (remotely operated vehicle) equipped with the flipper type crawler systems and conducted the experiments using it in a water tank and on the seafloor to observe its advantages. In the experiments in the water tank, the ROV was tested to run on the tilting table changing an angle and also to run over bumps nailed onto the top board of the tilting table. In the experiments on the seafloor, the ROV could evacuate from the condition that the crawler system was slightly submerged in the sand. Also the ROV could run and climb up the bumps. This paper describes the developed flipper type crawler systems and its advantages by describing the results of the experiments in the water tank and on the seafloor.
{"title":"Flipper type crawler system for running on the irregular seafloor","authors":"Tomoya Inoue, K. Takagi, T. Shiosawa","doi":"10.1109/OCEANSSYD.2010.5603541","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603541","url":null,"abstract":"Flipper type crawler system gives advantages when running on the irregular seafloor and when working on the seafloor. We developed a small size ROV (remotely operated vehicle) equipped with the flipper type crawler systems and conducted the experiments using it in a water tank and on the seafloor to observe its advantages. In the experiments in the water tank, the ROV was tested to run on the tilting table changing an angle and also to run over bumps nailed onto the top board of the tilting table. In the experiments on the seafloor, the ROV could evacuate from the condition that the crawler system was slightly submerged in the sand. Also the ROV could run and climb up the bumps. This paper describes the developed flipper type crawler systems and its advantages by describing the results of the experiments in the water tank and on the seafloor.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132637262","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}
Pub Date : 2010-05-24DOI: 10.1109/OCEANSSYD.2010.5603942
S. Anderson, J.T. Morris
Collisions between ships and whales are not rare occurrences. Apart from constituting a major cause of death for whale species which frequent busy oceanic areas such as the North Atlantic, such collisions often result in damage to ships. Thus there is keen interest in finding reliable means of detection of whales at sufficient range to ensure successful collision avoidance. In this paper we present the results of experiments aimed at establishing the potential of polarimetric microwave radar to provide such a means. The key element in our approach is the construction of a polarimetric filter which enhances the contrast between the disturbed sea surface around the whale and the ambient sea. The results suggest that detection can be achieved under conditions where conventional uni-polar radars such as those normally found on merchant ships would fail.
{"title":"On the detection of marine mammals with ship-borne polarimetric microwave radar","authors":"S. Anderson, J.T. Morris","doi":"10.1109/OCEANSSYD.2010.5603942","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603942","url":null,"abstract":"Collisions between ships and whales are not rare occurrences. Apart from constituting a major cause of death for whale species which frequent busy oceanic areas such as the North Atlantic, such collisions often result in damage to ships. Thus there is keen interest in finding reliable means of detection of whales at sufficient range to ensure successful collision avoidance. In this paper we present the results of experiments aimed at establishing the potential of polarimetric microwave radar to provide such a means. The key element in our approach is the construction of a polarimetric filter which enhances the contrast between the disturbed sea surface around the whale and the ambient sea. The results suggest that detection can be achieved under conditions where conventional uni-polar radars such as those normally found on merchant ships would fail.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133358912","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}
Pub Date : 2010-05-24DOI: 10.1109/OCEANSSYD.2010.5603540
Shi-bo Fan, Zhengping Feng, L. Lian
An architecture for collision free formation control of multiple autonomous underwater vehicles is proposed in this paper. Based upon blackboard communication, the architecture includes communication, motion control and environment interacting modules. Orderly-Quaternion sets and control matrix are defined for the design of accurate formation geometry. Formation changing rules are proposed based on sensor information at first, and control matrix and artificial potential method are then utilized in formation reconfiguration. Finally the proposed approach is verified by a simulation of a swarm of 8 AUV's moving through a constrained environment.
{"title":"Collision free formation control for multiple autonomous underwater vehicles","authors":"Shi-bo Fan, Zhengping Feng, L. Lian","doi":"10.1109/OCEANSSYD.2010.5603540","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603540","url":null,"abstract":"An architecture for collision free formation control of multiple autonomous underwater vehicles is proposed in this paper. Based upon blackboard communication, the architecture includes communication, motion control and environment interacting modules. Orderly-Quaternion sets and control matrix are defined for the design of accurate formation geometry. Formation changing rules are proposed based on sensor information at first, and control matrix and artificial potential method are then utilized in formation reconfiguration. Finally the proposed approach is verified by a simulation of a swarm of 8 AUV's moving through a constrained environment.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"473 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133415098","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}
Pub Date : 2010-05-24DOI: 10.1109/OCEANSSYD.2010.5603573
Ji Daxiong, Liu Jian, Liu Kaizhou
A calibration problem for log sensor of UUV is established and the problem can be divided into two separate parts: misalignment angle and scale factor of log sensor. Instead of using the conventional least square algorithm, a fine calibration approach based on M-estimate is used to suppress the effect of non-white noise. The adaptive factor relation to calibration precision is brought forward which is different from usual forgetting factor. The feasibility of the approach is demonstrated in the test of sea trail.
{"title":"Log sensor calibration using M-estimate","authors":"Ji Daxiong, Liu Jian, Liu Kaizhou","doi":"10.1109/OCEANSSYD.2010.5603573","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603573","url":null,"abstract":"A calibration problem for log sensor of UUV is established and the problem can be divided into two separate parts: misalignment angle and scale factor of log sensor. Instead of using the conventional least square algorithm, a fine calibration approach based on M-estimate is used to suppress the effect of non-white noise. The adaptive factor relation to calibration precision is brought forward which is different from usual forgetting factor. The feasibility of the approach is demonstrated in the test of sea trail.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131949842","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}
Pub Date : 2010-05-24DOI: 10.1109/OCEANSSYD.2010.5603610
M. Ueno, Y. Tsukada, H. Sawada
The submersible surface ship (SSS) is a ship that can avoid rough seas by going underwater. In order to submerge the SSS uses wings producing downward lift. The SSS, in submerged condition, keeps residual buoyancy for its safety. A prototype of SSS of which configuration is a hull, a pair of main wings and a pair of horizontal tail wings is designed and its model ship for tank tests is made. The circular motion test was carried out and hydrodynamic forces and moment in vertical motion were measured. The effect of submerged depth on the resistance and wings performances, and the effect of attack angle and pitch rate on the longitudinal and vertical forces and pitch moment acting on the SSS model are clarified. A method to estimate linear hydrodynamic derivatives is applied to the SSS model and compared with the results of tank test data analysis. The validity of the method and test data together with its effective utilization is discussed.
{"title":"Hydrodynamic forces and moment acting on a submersible surface ship in vertical motion","authors":"M. Ueno, Y. Tsukada, H. Sawada","doi":"10.1109/OCEANSSYD.2010.5603610","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603610","url":null,"abstract":"The submersible surface ship (SSS) is a ship that can avoid rough seas by going underwater. In order to submerge the SSS uses wings producing downward lift. The SSS, in submerged condition, keeps residual buoyancy for its safety. A prototype of SSS of which configuration is a hull, a pair of main wings and a pair of horizontal tail wings is designed and its model ship for tank tests is made. The circular motion test was carried out and hydrodynamic forces and moment in vertical motion were measured. The effect of submerged depth on the resistance and wings performances, and the effect of attack angle and pitch rate on the longitudinal and vertical forces and pitch moment acting on the SSS model are clarified. A method to estimate linear hydrodynamic derivatives is applied to the SSS model and compared with the results of tank test data analysis. The validity of the method and test data together with its effective utilization is discussed.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132173187","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}
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