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检索条件"机构=Science and Technology on Underwater Test and Control Laborary"

共 163 条记录，以下是41-50 订阅

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Experimental study on waveguide invariant passive ranging based on buoy 6

Experimental study on waveguide invariant passive ranging ba...

引用

6th International Conference on Communication, Image and Signal Processings, CCISP 2021

作者： Wang, Zhizhuan Zhang, Mingwei Zhang, Yang Li, Guijuan Zhang, Xuegang Science and Technology on Underwater Test and Control Laboratory Dalian China

ISBN: (纸本)9781665432795

The important feature of ocean waveguides is that there is a stable and observable interference structure in the low-frequency sound *** interference structure can be described by only one scalar parameter beta, which is called waveguide invariant. It reflects the relationship between distance, frequency and interference fringe slope. Therefore, the motion parameter information of the target can be obtained by analyzing the LOFAR diagram of the radiated noise of a moving ship, as a kind of equipment which is easy to be placed in the marine environment, buoy has been widely used in the field of underwater acoustics. In this paper, using the buoy test data, the distance information of the passive target is obtained by the waveguide invariant method, which overcomes the defect that the traditional buoy ranging method needs multiple buoys. The distance estimation of the passive target is realized only by a single buoy, and the distance measurement error within the effective range is no more than 10%. © 2021 IEEE.

关键词： Buoys

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Research on the real-time positioning method of vector buoys in deep sea

Research on the real-time positioning method of vector buoys...

引用

2020 International Conference on Electronics, Communications and Information technology, CECIT 2020

作者： Wang, Zhizhuan Zhang, Mingwei Li, Ling Li, Guijuan Chen, Yunfei Zhang, Xuegang Science and Technology on Underwater Test and Control Laboratory Dalian China

Buoys are generally difficult to anchor in Deep-sea environment, at the same, due to the influence of long-term in the ocean environment, the location relationship between each other buoys will change, which may cause the traditional predicted method of buoy system trapped in losing efficacy. This paper researched on the problem of the buoy baseline length vary positioning method applicability, on the basis of this study, focused on the theoretical analysis and simulation of applicability to different positioning method. Following this, a realtime positioning method based on vector buoys system in deep sea is presented. Covered the applicability shortage of traditional underwater acoustic passive positioning, used multiple vector buoys to locate the target jointly, and provide a theory basis for real-time positioning function of vector buoys in engineering. The simulation results show that this method is feasible and effective. © Published under licence by IOP Publishing Ltd.

关键词： Buoys

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A Discrimination Method between Surface and Submerged Targets based on Frequency Diversity Wavenumber Domain Features

A Discrimination Method between Surface and Submerged Target...

引用

2021 OES China Ocean Acoustics, COA 2021

作者： Li, Peng Dalian Scientific Test and Control Technology Institute Science and Technology on Underwater Test and Control Laboratory Dalian China

ISBN: (纸本)9781728181905

The discrimination between surface and submerged targets is one of the research focuses of passive sonar target recognition. In this paper, a discrimination method based on frequency diversity in wavenumber domain is proposed. The energy distribution in frequency-wavenumber domain is extracted by horizontal array modal beamforming method, and the wavenumber domain information of each frequency point is coherently superimposed to obtain the frequency diversity wavenumber domain eigenvalue. According to the prior knowledge of environment and the normal mode acoustic field simulation method, the decision threshold of discrimination can be generated. Based on the comparison between the eigenvalues of frequency diversity wavenumber domain and the decision threshold, the surface and submerged targets resolution of passive horizontal array is obtained. Simulation results show that the proposed method can effectively extract the frequency diversity wavenumber characteristics of target radiated noise in 96m and 192m horizontal array aperture, which can be used for engineering discrimination of surface and submerged targets. © 2021 IEEE.

关键词： Eigenvalues and eigenfunctions

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Experimental and Simulation Research on Flow Noise of underwater High Speed Vehicles

Experimental and Simulation Research on Flow Noise of Underw...

引用

2021 OES China Ocean Acoustics, COA 2021

作者： Wang, Youzhi Jia, Lianhui Guo, Xinyu Dalian Scientific Test and Control Technology Institute Science and Technology on Underwater Test and Control Laboratory Dalian China

ISBN: (纸本)9781728181905

In this paper, the mechanism and characteristics of underwater high-speed vehicle flow noise are studied by experimental and simulation methods. The experiment was carried out in a gravity-type low-noise water tunnel of Harbin Engineering University. The radiation noise of the model under multiple incoming flow velocities was measured. At the same time, combined with the PIV particle tracing technology, the sound position and mechanism of underwater targets were further explored. Then establish the same model through CATIA and use ANSYS software to establish the flow field and sound field calculation models respectively, and simulate the flow noise of the model at different flow speeds. Finally, the experimental data and the simulation data are compared and analyzed. The results show the flow noise of the target increases with the increase of the flow velocity, and the turbulent velocity and pulsating pressure at the head of the model are higher, followed by the tail, and the convective noise in the middle section contributes less. © 2021 IEEE.

关键词： Flow velocity

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underwater Transient Noise Duration Estimation Method Based on the Page test

Underwater Transient Noise Duration Estimation Method Based ...

引用

IEEE/OES China Ocean Acoustics (COA)

作者： Qin-Chuan Zhang Yan-Sen Liu Wang Yang Dalian Scientific Test and Control Technology Institute Dalian P. R. China Science and Technology on Underwater Test and Control Laboratory Dalian Scientific Test and Control Technology Institute Dalian P. R. China

ISBN: (数字)9798350340297

ISBN: (纸本)9798350340303

The underwater transient noise radiated by ships provides rich target information and is the focus of target acoustic characteristics analysis. The duration is a crucial representation parameter of the time-domain envelope. The Page test is an effective method for detecting transients, as it can be used to estimate the starting time of the transient. Hence, in this study, the ending time of the transient is estimated by performing time-domain reversal on the signal. In addition, in a low-signal-to-noise ratio environment, wavelet noise reduction pre-processing is introduced to improve the estimation effect and then to estimate the duration of transient noise. The simulation verification results reveal that this method can accurately estimate the duration of underwater transient noise and can also ensure high accuracy in low-signal-to-noise ratio environments.

关键词： Accuracy Oceans Noise reduction Estimation Acoustics Transient analysis Time-domain analysis Marine vehicles Signal to noise ratio

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Construction of Acoustic Dipole and Its Performance Verification test in Shallow Water

Construction of Acoustic Dipole and Its Performance Verifica...

引用

2021 OES China Ocean Acoustics, COA 2021

作者： Chunxia, Meng Xiaoyuan, Li Zhongcheng, Ma Feng, Cao Hang, Su Science and Technology on Underwater Test and Control Laboratory DaLian China Dalian Scientific Test and Control Technology Insititute DaLian China

ISBN: (纸本)9781728181905

The complex underwater noise field is formed in the process of the ship's constant volume sound source sailing. Due to the large number of machinery and equipment on the ship, and the navigation state of the ship on the sea is easy to change, these factors make it difficult to obtain the low-frequency radiated noise characteristics of the ship in a stable state. Therefore, it is an effective way to understand and master the characteristics of low-frequency underwater radiated noise field by using directional sound source in controllable state. Dipole transducer is a typical directional sound source with horizontal or vertical octagonal directivity, which is widely used in seismic and logging research. However, few dipole transducers are used in underwater acoustic research. The reason is: the directional emission of underwater acoustic low-frequency transducer is a big problem in the current transducer design. The directional emission technology of low-frequency dipole transducer is related to the distance / wavelength of the radiation surface. Because the position relationship of the radiation surface is fixed, it can only form the ideal directivity at a specific frequency. This brings great inconvenience to the application of underwater acoustic low- frequency dipole transducer. Firstly, the mathematical model of sound field radiated by acoustic dipole is established;then, the common non-directional low-frequency sound source is used to construct an acoustic dipole source. By adjusting the distance between two low-frequency sound sources, low-frequency dipole signals with different frequencies can be emitted. The lake test results show that the maximum difference of horizontal directivity of dipole source is less than 0.5dB and the depth of concave point is more than 21dB;finally, the test scheme in shallow water is designed, and the low-frequency narrow-band signals of 63Hz and 80Hz are emitted by the acoustic dipole source in uniform towing state, and the receiv

关键词： underwater acoustics

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Feature Mining Method Based on Deep Learning for underwater Electric Field Prediction in Marine Environment

Feature Mining Method Based on Deep Learning for Underwater ...

引用

Communication Systems (ECCS), European Conference on

作者： Pei Cui Kaina Jiang Jin Yue Yuanzhe Wu Yibo Fu Science and Technology on Underwater Test and Control Laboratory Dalian China Dalian Institute of Measurement and Control Technology Dalian China

The low-frequency electric field generated by various electromagnetic effects in the ocean overwrites the useful signal in amplitude and frequency, as a background distraction field for electric field detection. Effective electric field characteristic analysis and prediction methods are helpful to improve the environmental adaptability of the equipment and the ability of target detection. The deep learning method is used to mine the characteristics of underwater electric field in the marine environment to improve the prediction accuracy. In order to explore the relationship between seawater environmental parameters and electric field characteristics, parameters including measure time, seawater conductivity, water depth and wave height are used as independent variables, and the amplitude of the underwater electric field in the marine environment is used as the dependent variable. The relationship model between independent variables and dependent variables are established by deep neural network training to realize the prediction of underwater electric field characteristics in the marine environment. The results of 103 training samples and 2 test samples show that the method can effectively identify the test samples, and can be used for the mining and prediction of underwater electric field characteristics, as well as the detection and identification of weak electric field signals submerged in the marine environment.

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Influence of Physical Parameters on Echo Spectrum of underwater Target

Influence of Physical Parameters on Echo Spectrum of Underwa...

引用

IEEE/OES China Ocean Acoustics (COA)

作者： Yunfei Chen Dapeng Yu Bing Jia Zhenshan Wang Jintao Yong Yanjie Wang School of Information and Communication Engineering Dalian University of Technology Dalian China Science and Technology on Underwater Test and Control Laboratory Dalian China

ISBN: (数字)9798350340297

ISBN: (纸本)9798350340303

The elastic scattering features of the underwater target scattering wave depend on the physical parameters of the target, such as the material and structure. Intuitively evaluating the influence of the elastic scattering wave on the characteristics of the whole scattering wave signal is difficult due to the coupling and superposition of the elastic scattering wave and the geometric scattering wave of the target. Based on the different modulation characteristics of broadband echo spectrum produced by target geometry scattering and elastic scattering wave, this paper characterizes and studies the modulation features of echo spectrum and tests the influence of physical parameters on the echo spectrum of underwater target using several simple cylindrical targets with different physical parameters. Moreover, the geometric scattering wave and the elastic scattering wave of the simple target echo are extracted using the fractional Fourier transform (FrF $T$ ) domain filtering method, and the influence of physical parameters on the echo spectrum is quantitatively analyzed.

关键词： Geometry Couplings Fourier transforms Filtering Oceans Scattering Modulation Feature extraction Acoustics Broadband communication

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A Hydroacoustic Positioning Method Based on Analysis of the Error Region of Three-circle Intersection

A Hydroacoustic Positioning Method Based on Analysis of the ...

引用

2021 OES China Ocean Acoustics, COA 2021

作者： Cui, Pei Jiang, Kaina Lv, Junjun Zhao, Zhe Yue, Jin Jiao, Dawen Dalian Institute of Measurement and Control Technology Dalian China Science and Technology on Underwater Test and Control Laboratory Dalian China

ISBN: (纸本)9781728181905

A hydroacoustic positioning method based on three-circle intersection presented in this paper is used to locate the underwater measuring units equipped with sensors to measure magnetic and electric field. Due to the existence of controllable and non-controllable error sources such as measurement distance of underwater acoustic and entry depth of the surface positioning device in the positioning process, there is a triangle error area that makes the positioning results not satisfactory. In order to improve the positioning accuracy, the convergence and diffusion law of the triangle error area are studied with data analysis software by setting error ranges of the positioning circle radius and the step size in response to the measured results in sea test. The analysis results show that the optimized positioning method based on the three-circle intersection can well reduce the size of the triangle error area and effectively improve the positioning accuracy. © 2021 IEEE.

关键词： underwater acoustics

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Navigation radar image fusion of different scales based on improved wavelet transform rules

Navigation radar image fusion of different scales based on i...

引用

Chinese control and Decision Conference, CCDC

作者： Haoyan Zhang Lu Zhang Fangyuan Jin Yuanyuan Guo Yunying Wang Yunsheng Fan Science and Technology on Underwater Test and Control Laboratory Dalian China College of Marine Electrical Engineering Dalian Maritime University Dalian China

ISBN: (数字)9798350387780

ISBN: (纸本)9798350387797

Due to the disadvantages of the image fusion system such as unclear target contour of long-range radar image, insufficient perceptual range of near-range radar image and insufficient detail of traditional wavelet transform fusion rules for processing high frequency coefficients, the fused images cannot meet the requirements of large information volume, high definition and small discrepancy. To solve this problem, the maximum Brenner region energy wavelet transform image fusion (MBREWTIF) algorithm is proposed, Firstly, the alignment of the two radar images is realized to prepare for the next step of algorithmic fusion. Secondly, an improved fusion rule for high frequency coefficients is devised based on the wavelet transform image fusion algorithm. Finally, the Brenner region energy method is developed by combining the energy gradient of the Brenner function method and the improved fusion weight in the region energy method. The simulation results verify that the proposed MBREWTIF algorithm improves the content and clarity of image information and reduces the discrepancy in the dual radar fusion process compared with other existing algorithms.

关键词： Wavelet transforms Navigation Simulation Radar imaging Market research High frequency Image fusion

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