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检索条件"机构=Science and Technology on Underwater Information and Control Laborator"

共 63 条记录，以下是41-50 订阅

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A Dynamic Time Warping Based Wake-Up Signal Detection Method for underwater Acoustic Communication Networks

A Dynamic Time Warping Based Wake-Up Signal Detection Method...

引用

IEEE Advanced information Management,Communicates,Electronic and Automation control Conference (IMCEC)

作者： Lu Ma Cheng Fan Wei Sun Gang Qiao Science and Technology on Communication Information Security Control Laboratory Jiaxing Zhejiang China College of Underwater Acoustic Engineering Harbin Engineering University Harbin China

The conventional underwater acoustic (UWA) wakeup signals detection methods for both underwater cooperative nodes and non-cooperative nodes are FFT based signal detection and matched-filtered based signal detection. While there is a big performance degradation of these conventional frequency-offset sensitive methods due to the relative motion between nodes, complex underwater noise environment, channel time-varying and other interference sources. This paper proposes a dynamic time warping (DTW) algorithm to detect the wake-up signal in UWA communication networks, which is frequency-offset insensitive and performs better than the conventional methods in severe frequency-offset environment by simulations based on the true UWA channel measured from sea trial.

关键词： Signal detection Time-frequency analysis Heuristic algorithms Signal to noise ratio underwater acoustics Power demand

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Comparison of Jamming Methods for underwater Acoustic DSSS Communication Systems

Comparison of Jamming Methods for Underwater Acoustic DSSS C...

引用

IEEE Advanced information Management, Communicates, Electronic and Automation control Conference

With the development of underwater acoustic communications (UWAC), jamming methods for UWAC becomes much more attentive in communication countermeasure system. Direct sequence spread spectrum (DSSS) signal as a way of reliable covert communications is widely used for UWA channels. In this paper, single-tone jamming, narrowband jamming and correlated jamming based on PN code PSK modulation for UWA DSSS communication system are compared under different signal-to-noise ratio first, which assumes that the jammer knows perfect parameters in DSSS signal. Besides, performance of the above three jamming methods are compared by simulations under the blind estimates of carrier frequency, chip length, period of PN code and PN code itself, which demonstrates the influence of the estimation error on these jamming methods.

关键词： underwater acoustic communications (UWAC) Direct sequence spread spectrum (DSSS) Jamming

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Design and Test about High Sensitivity Thin Shell Piezoelectric Hollow Sphere Hydrophone

Design and Test about High Sensitivity Thin Shell Piezoelect...

引用

Oceans (Conference)

作者： Duo TENG Hu YANG Guolei ZHU School of Marine Science and Technology National Key Laboratory for Underwater Information Processing and Control Northwestern Polytechnical University Xi'an China

ISBN: (纸本)9781509064298;9780692946909

A spherical hydrophone is developed. The equivalent circuit model and finite element model about the thin piezoelectric spherical shells have been built to predict its major performances. Some hydrophone prototypes have been fabricated and the corresponding tests in the anechoic tank have been finished. The results show that the above two way to design and simulate the thin piezoelectric spherical shells are both effective, and the prototypes have the high sensitivity of -182dB at 150 kHz.

关键词： Spherical hydrophone Thin piezoelectric spherical shells Equivalent circuit model Finite element model Sensitivity

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The networked underwater vehiclȩs yaw control system based on sliding mode controller

The networked underwater vehiclȩs yaw control system based ...

引用

2016 International Conference on Advanced Robotics and Mechatronics, ICARM 2016

作者： Liu, Weidong Li, Zeyu Gao, Li-E School of Marine Science and Technology Northwest Polytechnical University China Science and Technology on Underwater Information Control Laboratory Xi'an China

ISBN: (纸本)9781509033645

The underwater vehiclȩ yaw control system is a distributed networked control system containing sensors, controller and actuators. Networked control system (NCS) can be disturbed by time delay of data packages and transmission interference. The stability of controller in the system can weaken these disadvantages. This paper investigates sliding mode control (SMC) for the networked underwater vehicle yaw control system. A linear vehicle laterally mathematical equation is first obtained by linearizing the six-degree-freedom motion dynamics of a submarine. And based on the linear equation and sliding mode control theory, the heading controller is designed. The closed-loop system is analytically proved to be stable by Lyapunov stability theory. Using the TrueTime platform, a networked control system under the Ethernet is established, to demonstrate the effectiveness of the proposed controller. The numeric simulations indicate that the presented controller can strengthen stability of NCS. © 2016 IEEE.

关键词： Sliding mode control

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Path Planning for UUV in Dynamic Environment 9

Path Planning for UUV in Dynamic Environment

引用

9th International Symposium on Computational Intelligence and Design, ISCID 2016

作者： Wen, Zhi-Wen Li, Ming-Kun Wang, Li-Jing Science and Technology on Underwater Information and Control Laboratory Xi'an China Xi'an Precision Machinery Research Institute Xi'an China

ISBN: (纸本)9781509035588

From naval operations to ocean science missions, the importance of autonomous vehicles is increasing with the advances in underwater robotics technology. Due to the dynamic and intermittent underwater environment and physical limitations of underwater unmanned vehicle (UUV), feasible and optimal path planning is crucial for autonomous underwater operations. According to different mission, the path planning method of UUV is divided into two categories: the point to point path planning and the complete coverage path planning. The objective of this thesis is to develop and demonstrate an efficient underwater path planning method that is adapted to complicated ocean environment. In this thesis, existing path planning method for the fields of ocean science and robotics are first reviewed, and then local dynamic obstacle avoidance method is proposed to avoid dynamic obstacles. Based on this again, the path planning of UUV in local dynamic environment can be efficiently implemented by adopting rolling window path planning method and local dynamic obstacle avoidance method. This method with the guide point strategy combines global path planning with local dynamic path planning, so that not only the requirements of real-time on-line path planning for UUV are met, the global optimality is also considered. A navigation route for UUV is planned in advance by using priori environmental information based on ant colony algorithm, so it provides the reference information for the selection of guide point. In order to solved the problem of area coverage search, a complete coverage path planning method is proposed by combining ant colony algorithm with biologically inspires neural network. In order to demonstrate underwater path planning method, all of the above ideas and methods developed were tested in simulation experiments. © 2016 IEEE.

关键词： Motion planning

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Enhanced Adaptive Equalization for MIMO underwater Acoustic Communications

Enhanced Adaptive Equalization for MIMO Underwater Acoustic ...

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Oceans (Conference)

作者： Jun Tao Liang An Yahong Rosa Zheng Key Laboratory of Underwater Acoustic Signal Processing of Ministry of Education Southeast University Nanjing China Ministry of Education of China Key Laboratory of System Control and Information Processing Shanghai China Missouri University of Science and Technology Rolla MO US

ISBN: (纸本)9781509064298;9780692946909

An enhanced normalized least mean squares (NLMS) adaptive equalization scheme is proposed for single-carrier underwater acoustic (UWA) communications. The enhancement is achieved via two techniques: the sparse adaptation (SA) technique and the data reuse (DR) technique. The SA technique speeds up the convergence and improves the performance of the adaptive equalization, by taking advantage of the inherent sparsity of the equalizer. It is implemented as the selective zero-attracting NLMS (SZA-NLMS) algorithm, developed by introducing a range of attraction for the existing zero-attracting NLMS (ZA-NLMS) algorithm. Compared with the ZA-NLMS, the SZA-NLMS incurs a lower complexity and achieves a better performance. The DR technique effectively prolongs the training length and significantly reduces the training overhead. Attributed to the DR technique, a high transmission efficiency is achieved even for a block transmission. The proposed adaptive equalization is verified by the real data collected in an atsea multiple-input multiple-output (MIMO) underwater acoustic communication trial. The experimental results show it considerably outperforms the standard NLMS adaptive equalization, especially with a low DR number.

关键词： Adaptive equalizers MIMO communication Training underwater acoustics Standards Phase locked loops

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The product service lifecycle management based on sustainable development

The product service lifecycle management based on sustainabl...

引用

2016年IEEE/INFORMS服务运筹、物流与信息化国际会议

作者： Mingkun Li Xiaojuan Cao Lan Wang Litao Deng Science and Technology on Underwater Information and Control Laboratory Xi'an Precision Machinery Research Institute

It has become an irresistible worldwide trend for manufacturing enterprise to be responsible for the whole life cycle of its products. Under the circumstance, the sustainability will be more comprehensive understood and more deeply considered in product design stage. This paper reviews the research on sustainable development, product lifecycle management(PLM) and product service system(PSS) briefly. A concept of product service lifecycle management is proposed. Then this paper analyzes the benefits of the combination of PSS and PLM within the circumstance of sustainable development. As for the realization of product service lifecycle management, the key technologies are shown. In the end, an application case in automobile is introduced, and the strategies on design stage are presented in detail.

关键词： product lifecycle management(PLM) product service systemg(PSS) product service lifecycle management sustainable development

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The product service lifecycle management based on sustainable development

The product service lifecycle management based on sustainabl...

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IEEE International Conference on Service Operations and Logistics, and Informatics, SOLI

作者： Mingkun Li Xiaojuan Cao Lan Wang Litao Deng Science and Technology on Underwater Information and Control Laboratory Xi'an Precision Machinery Research Institute Xi'an China

ISBN: (纸本)9781509029280

It has become an irresistible worldwide trend for manufacturing enterprise to be responsible for the whole life cycle of its products. Under the circumstance, the sustainability will be more comprehensive understood and more deeply considered in product design stage. This paper reviews the research on sustainable development, product lifecycle management (PLM) and product service system (PSS) briefly. A concept of product service lifecycle management is proposed. Then this paper analyzes the benefits of the combination of PSS and PLM within the circumstance of sustainable development. As for the realization of product service lifecycle management, the key technologies are shown. In the end, an application case in automobile is introduced, and the strategies on design stage are presented in detail.

关键词： Sustainable development Maintenance engineering Manufacturing Business Product design Recycling Production

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AUV dead-reckoning navigation based on neural network using a single accelerometer 11

AUV dead-reckoning navigation based on neural network using ...

引用

11th ACM International Conference on underwater Networks and Systems, WUWNet 2016

作者： Xie, Yan-Xin Liu, Jun Hu, Cheng-Quan Cui, Jun-Hong Xu, Hongli State Key Laboratory of Robotics CAS No. 114 Nanta Street Shenhe District Shenyang China College of Computer Science and Technology Jilin University Changchun China Underwater Sensor Network Lab. University of Connecticut StorrsCT06269 United States Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai200240 China

ISBN: (纸本)9781450346375

The accuracy of the Autonomous underwater Vehicles (AUVs) navigation system determines whether they can safely operate and return. Traditional Dead-reckoning (DR) relies on the inertial sensors such as gyroscope and accelerometer. A major challenge for DR navigation is from measurement error of the inertial sensors (gyroscope, accelerometer, etc.), especially when the AUV is near or at the ocean surface. The AUV's motion is affected by ocean waves, and its pitch angle changes rapidly with the waves. This rapid change and the measurement errors will cause great noise to the direction measured by gyroscopes, and then lead to a large error to the DR navigation. To address this problem, a novel DR method based on neural network (DR-N) is proposed to explore the time-varying relationship between acceleration measurement and orientation measurement, which leverages acoustic localization and neural network estimate timely pitch angle through the explored time-varying relationship. This method enables AUV's DR navigation with a single acceleration, without relying on both acceleration and gyroscope. Most importantly, we can improve the accuracy of AUV navigation through avoiding DR errors caused by gyroscope noise at the sea surface. Simulations show DR-N significantly improves navigation accuracy.

关键词： Accelerometers

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A simulator for swarm AUVs acoustic communication networking 11

A simulator for swarm AUVs acoustic communication networking

引用

11th ACM International Conference on underwater Networks and Systems, WUWNet 2016

作者： Li, Guannan Liu, Jun Wang, Xue Xu, Hongli Cui, Jun-Hong Shenyang Institute of Automation CAS University of Chinese Academy of Sciences No. 114 Nanta Street Shenhe District Shenyang China College of Computer Science and Technology Jilin University State Key Laboratory of Robotics Key Laboratory of System Control and Information Processing Ministry of Education of China Changchun China Shenyang Institute of Automation CAS Northeast University No. 114 Nanta Street Shenhe District Shenyang China Shenyang Institute of Automation CAS No. 114 Nanta Street Shenhe District Shenyang China College of Computer Science and Technology Jilin University Changchun China Underwater Sensor Network Lab. University of Connecticut StorrsCT06269 United States

ISBN: (纸本)9781450346375

This paper presents a simulator for swarm operations designed to verify algorithms for a swarm of autonomous underwater robots (AUVs), specifically for constructing an underwater communication network with AUVs carrying acoustic communication devices. This simulator consists of three nodes: a virtual vehicle node (VV), a virtual environment node (VE), and a visual showing node (VS). The modular design treats AUV models as a combination of virtual equipment. An expert acoustic communication simulator is embedded in this simulator, to simulate scenarios with dynamic acoustic communication nodes. The several simulations we have performed demonstrate that this simulator is easy to use and can be further improved.

关键词： Simulators

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