The Experts below are selected from a list of 9825 Experts worldwide ranked by ideXlab platform
Shuang Zhao - One of the best experts on this subject based on the ideXlab platform.
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accurate multiple ocean bottom seismometer positioning in shallow water using gnss acoustic technique
Sensors, 2019Co-Authors: Huimin Liu, Zhenjie Wang, Shuang ZhaoAbstract:The Global Navigation Satellite System combined with acoustic technique has achieved great economic benefits in positioning of ocean bottom seismometers, with hundreds of underwater Transponders attached to seismometers typically being deployed during oil exploration. The previous single Transponder positioning method ignored the similar underwater environments between the Transponders. Due to the refraction effect of sound, the technique usually showed poor positioning accuracy in shallow water when the incidence angles are large. In this paper, the effect of sound ray bending is analyzed based on the sound ray tracing method in shallow water, and a new piecewise incidence angle model is proposed to improve the positioning accuracy of multiple objects in order to estimate the sound ray bending correction. The parameters of the new model are divided into groups and estimated by sequential least squares method, together with all of the Transponders. The observability analysis is discussed in simulation and testing experiments in the South China Sea. The results show that the newly proposed method is able to make full use of the acoustic observation data of hundreds of Transponders to accurately estimate the SRB correction, which could also significantly improve the positioning accuracy of multiple Transponders.
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Accurate Multiple Ocean Bottom Seismometer Positioning in Shallow Water Using GNSS/Acoustic Technique
MDPI AG, 2019Co-Authors: Huimin Liu, Zhenjie Wang, Shuang ZhaoAbstract:The Global Navigation Satellite System combined with acoustic technique has achieved great economic benefits in positioning of ocean bottom seismometers, with hundreds of underwater Transponders attached to seismometers typically being deployed during oil exploration. The previous single Transponder positioning method ignored the similar underwater environments between the Transponders. Due to the refraction effect of sound, the technique usually showed poor positioning accuracy in shallow water when the incidence angles are large. In this paper, the effect of sound ray bending is analyzed based on the sound ray tracing method in shallow water, and a new piecewise incidence angle model is proposed to improve the positioning accuracy of multiple objects in order to estimate the sound ray bending correction. The parameters of the new model are divided into groups and estimated by sequential least squares method, together with all of the Transponders. The observability analysis is discussed in simulation and testing experiments in the South China Sea. The results show that the newly proposed method is able to make full use of the acoustic observation data of hundreds of Transponders to accurately estimate the SRB correction, which could also significantly improve the positioning accuracy of multiple Transponders
Masahiko Jinno - One of the best experts on this subject based on the ideXlab platform.
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advantages of ip over elastic optical networks using multi flow Transponders from cost and equipment count aspects
Optics Express, 2014Co-Authors: Takafumi Tanaka, Akira Hirano, Masahiko JinnoAbstract:To evaluate the cost efficiency of IP over elastic optical network architectures, we use a multi-layer network design scheme that covers network to node equipment level. An evaluation in a static traffic environment shows that the multi-flow optical Transponder-based elastic optical network reduces total cost as well as equipment counts compared to other elastic network models based on fixed-rate, mixed-line-rate and bandwidth-variable Transponders.
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impact of multi flow Transponder on equipment requirements in ip over elastic optical networks
European Conference on Optical Communication, 2013Co-Authors: Takafumi Tanaka, Akira Hirano, Masahiko JinnoAbstract:We evaluate the elastic optical network performance from the network to node equipment level using a multi-layer network design scheme. Results show that the multi-flow Transponder-based network model reduces equipment requirements such as router IFs and Transponders compared to mixed-line-rate and bandwidth-variable models.
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performance evaluation of elastic optical networks with multi flow optical Transponders
European Conference and Exhibition on Optical Communications, 2012Co-Authors: Takafumi Tanaka, Akira Hirano, Masahiko JinnoAbstract:We compare elastic optical networks with multi-flow optical Transponders (MF-OTPs) to networks with fixed-rate and adaptive-rate Transponders in terms of spectrum efficiency (SE) and necessary number of Transponders. Our evaluation shows that the elastic optical network with MF-OTPs achieves high SE and low Transponder numbers.
Huimin Liu - One of the best experts on this subject based on the ideXlab platform.
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accurate multiple ocean bottom seismometer positioning in shallow water using gnss acoustic technique
Sensors, 2019Co-Authors: Huimin Liu, Zhenjie Wang, Shuang ZhaoAbstract:The Global Navigation Satellite System combined with acoustic technique has achieved great economic benefits in positioning of ocean bottom seismometers, with hundreds of underwater Transponders attached to seismometers typically being deployed during oil exploration. The previous single Transponder positioning method ignored the similar underwater environments between the Transponders. Due to the refraction effect of sound, the technique usually showed poor positioning accuracy in shallow water when the incidence angles are large. In this paper, the effect of sound ray bending is analyzed based on the sound ray tracing method in shallow water, and a new piecewise incidence angle model is proposed to improve the positioning accuracy of multiple objects in order to estimate the sound ray bending correction. The parameters of the new model are divided into groups and estimated by sequential least squares method, together with all of the Transponders. The observability analysis is discussed in simulation and testing experiments in the South China Sea. The results show that the newly proposed method is able to make full use of the acoustic observation data of hundreds of Transponders to accurately estimate the SRB correction, which could also significantly improve the positioning accuracy of multiple Transponders.
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Accurate Multiple Ocean Bottom Seismometer Positioning in Shallow Water Using GNSS/Acoustic Technique
MDPI AG, 2019Co-Authors: Huimin Liu, Zhenjie Wang, Shuang ZhaoAbstract:The Global Navigation Satellite System combined with acoustic technique has achieved great economic benefits in positioning of ocean bottom seismometers, with hundreds of underwater Transponders attached to seismometers typically being deployed during oil exploration. The previous single Transponder positioning method ignored the similar underwater environments between the Transponders. Due to the refraction effect of sound, the technique usually showed poor positioning accuracy in shallow water when the incidence angles are large. In this paper, the effect of sound ray bending is analyzed based on the sound ray tracing method in shallow water, and a new piecewise incidence angle model is proposed to improve the positioning accuracy of multiple objects in order to estimate the sound ray bending correction. The parameters of the new model are divided into groups and estimated by sequential least squares method, together with all of the Transponders. The observability analysis is discussed in simulation and testing experiments in the South China Sea. The results show that the newly proposed method is able to make full use of the acoustic observation data of hundreds of Transponders to accurately estimate the SRB correction, which could also significantly improve the positioning accuracy of multiple Transponders
W Steinhagen - One of the best experts on this subject based on the ideXlab platform.
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a low power Transponder ic for high performance identification systems
IEEE Journal of Solid-state Circuits, 1995Co-Authors: U Kaiser, W SteinhagenAbstract:A novel CMOS integrated circuit for a batteryless Transponder system is presented. Batteryless Transponders require contactless transmission of both the information and power between a mobile data carrier and a stationary or handheld reader unit. The operating principle of this system gives a superior performance in reading distance due to separation of the powering and data transmission phases-compared to systems with continuous powering and damping modulation. This paper describes the function of the Transponder IC and the circuit design techniques used for the various building blocks. >
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a low power Transponder ic for high performance identification systems
Custom Integrated Circuits Conference, 1994Co-Authors: U Kaiser, W SteinhagenAbstract:A novel integrated circuit for a battery-less Transponder system is presented. Battery-less Transponders require contactless transmission of both the information and power between a mobile data carrier and a stationary or handheld reader unit. The operating principle of this system gives a superior performance in reading distance due to separation of the powering and data transmission phases. This paper describes the function of the Transponder IC and the circuit design techniques used for the various building blocks. >
Takafumi Tanaka - One of the best experts on this subject based on the ideXlab platform.
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advantages of ip over elastic optical networks using multi flow Transponders from cost and equipment count aspects
Optics Express, 2014Co-Authors: Takafumi Tanaka, Akira Hirano, Masahiko JinnoAbstract:To evaluate the cost efficiency of IP over elastic optical network architectures, we use a multi-layer network design scheme that covers network to node equipment level. An evaluation in a static traffic environment shows that the multi-flow optical Transponder-based elastic optical network reduces total cost as well as equipment counts compared to other elastic network models based on fixed-rate, mixed-line-rate and bandwidth-variable Transponders.
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impact of multi flow Transponder on equipment requirements in ip over elastic optical networks
European Conference on Optical Communication, 2013Co-Authors: Takafumi Tanaka, Akira Hirano, Masahiko JinnoAbstract:We evaluate the elastic optical network performance from the network to node equipment level using a multi-layer network design scheme. Results show that the multi-flow Transponder-based network model reduces equipment requirements such as router IFs and Transponders compared to mixed-line-rate and bandwidth-variable models.
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performance evaluation of elastic optical networks with multi flow optical Transponders
European Conference and Exhibition on Optical Communications, 2012Co-Authors: Takafumi Tanaka, Akira Hirano, Masahiko JinnoAbstract:We compare elastic optical networks with multi-flow optical Transponders (MF-OTPs) to networks with fixed-rate and adaptive-rate Transponders in terms of spectrum efficiency (SE) and necessary number of Transponders. Our evaluation shows that the elastic optical network with MF-OTPs achieves high SE and low Transponder numbers.
