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7th International Conference on Communication, Image and Signal Processing, CCISP 2022

作者： Lv, Wei Sun, Naiwei Ni, Wenxi Shen, Shen Science and Technology on Underwater Information and Control Laborator Xi'An Precision Machiney Research Institude Xi'an China

ISBN: (数字)9781665459594

ISBN: (纸本)9781665459594

In order to research the underwater bubble screen echo, a modeling and simulation method is proposed in this paper. First, the mathematical model of underwater bubble shell is modeled. Second, the simulation experiments are carried out in different working conditions. Finally, the presented model is validated by comparing the spatial-temporal characteristics of the simulation data and the trial data using the space-time adaptive process. © 2022 IEEE.

关键词： underwater acoustics

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Influence of Physical Parameters on Echo Spectrum of underwater Target

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

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2024 OES China Ocean Acoustics, COA 2024

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

ISBN: (纸本)9798350340297

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 (FrFT) domain filtering method, and the influence of physical parameters on the echo spectrum is quantitatively analyzed. © 2024 IEEE.

关键词： Elastic scattering

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A Multi-Target Value Sequencing Method for underwater Mobile Observation Platforms Based on Motion Features

A Multi-Target Value Sequencing Method for Underwater Mobile...

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7th International Conference on Electronics technology, ICET 2024

作者： Zheng, Yi Yang, Xiangfeng Shi, Lei Yang, Yunchuan Science and Technology on Underwater Information and Control Laboratory Xi'an Precision Machinery Research Institute Xi'an China

ISBN: (纸本)9798350363951

How to prioritize observation targets when carrying out multi-target observation is an essential question for underwater mobile observation platforms. This problem can be solved by ranking the observation targets using the importance metric. With the knowledge of the target detection capabilities of underwater active acoustic homing detection devices, we first established a group of target value sequencing indexes based on the motion features of the targets and the correlation between the motions. Then, we designed a membership function to quantify each index, thus forming an underwater target value sequencing system. In addition, we designed a series of weight functions to form a variable weight vector for dynamic adjustment of the indexes in response to the change of situation and the change of indexes. The effectiveness of the proposed method is verified through a simulation experiment. The proposed method also yield good results under the data-missing condition, demonstrating that it is superior to the analytic hierarchy process in terms of robustness. © 2024 IEEE.

关键词： Membership functions

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Study on Fluctuation Characteristics of Acoustic Signals under Density Layered Fluid Disturbance

Study on Fluctuation Characteristics of Acoustic Signals und...

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2024 OES China Ocean Acoustics, COA 2024

作者： Yong, Jintao Chen, Yunfei Wang, Zhenshan Jia, Bing Wang, Rui Mo, Shiqi Science and Technology on Underwater Test and Control Laboratory Dalian China College of Underwater Acoustic Engineering Harbin Engineering University Harbin China College of Information and Communication Engineering Dalian University of Technology Dalian China

ISBN: (纸本)9798350340297

This study investigates the fluctuation characteristics of acoustic signals in the presence of flow field perturbations within density-stratified fluids through laboratory simulation experiments. A density stratification tank was used to replicate the ocean's stratified environment. The SUBOFF scaled model was employed to mimic the underwater vehicle's navigation process in towing mode. controlled density stratification simulation experiments were conducted to explore the acoustic signal fluctuation characteristics within the wake flow field of the submerged model. Data on the undulation properties of acoustic signals that propagated through the wake flow field of the underwater vehicle were collected. The undulation characteristics of the acoustic signal at two towing speeds and various spatial positions were analyzed. In alignment with the typical marine environment characteristics, this study designed the stratification conditions, the scale of the scaled model, and the towing speed based on the Froude number (Fri) similarity criterion and the geometric similarity law. The analysis of the experimental results indicates that the fluctuating frequency of the acoustic signal amplitude diminishes over time as the wake dissipates post-target passage. Concurrently, the intensity of the high-frequency fluctuation component of the signal also decreases with the dissipation of the wake. © 2024 IEEE.

关键词： Wakes

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Multivariate Multiscale Sample Entropy for Multi-Channel underwater Acoustic Signal Analysis 7

Multivariate Multiscale Sample Entropy for Multi-Channel Und...

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7th IEEE information technology, Networking, Electronic and Automation control Conference, ITNEC 2024

作者： Zhou, Jing Li, Yaan Wang, Mingzhou Shi, Lei School of Marine Science and Technology Northwestern Polytechnical University Xi'an China Xi'an Precision Machinery Research Institute National Key Laboratory of Underwater Information and Control Xi'an China

ISBN: (纸本)9798350370782

Multi-channel time series collected by arrays are prevalent in underwater acoustic signal processing and are crucial for uncovering the intrinsic characteristics of the observed system. This paper introduces the multivariate multiscale sample entropy (MMSE) to assess the complexity information in multi-channel underwater acoustic signals. Simulation analysis is employed to validate the effectiveness of the MMSE algorithm in extracting both within-channel and cross-channel information from multi-channel signals. Various types of simulated ship-radiated noise are generated to illustrate the MMSE algorithm's capability to differentiate between signals. Additionally, we employ MMSE to analyze various real-world signals, including ship-radiated noise, ambient noise, and interface reverberation. The MMSE results demonstrate its proficiency in differentiating various underwater acoustic signals compared to traditional frequency domain methods. © 2024 IEEE.

关键词： Frequency domain analysis

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Experimental study on the effect of underwater multiple degradation links on optical signal transmission: Experimental study on the effect of underwater multiple degradation links on optical signal transmission 6

Experimental study on the effect of underwater multiple degr...

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6th International Conference on Artificial Intelligence and Pattern Recognition, AIPR 2023

作者： Zhang, Jianlei Zhang, Pengwei Zhu, Yunzhou Tian, Yuxin School of Electronic Engineering Xi'an University of Posts and Telecommunications Xi'an710121 China Science and Technology on Underwater Information and Control Laboratory Xi'an710077 China

ISBN: (纸本)9798400707674

This paper presents an experimental investigation of the impact of various environmental factors, including temperature, salinity, and air bubbles, on the transmission of optical signals. A reception model was established to capture the degradation of the optical signal as it passes through multiple links. The fading of optical signals passing through different channels was quantified and analyzed. The findings highlight the distinct impacts of temperature, salinity, and air bubbles on the propagation of optical signals. Additionally, the study reveals that turbulence intensity plays a pivotal role in influencing the variability of the normalized amplitude of the received signal. © 2023 ACM.

关键词： Turbulence

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A Data Association Method Based on Azimuth Inverse Cotangent Value 7

A Data Association Method Based on Azimuth Inverse Cotangent...

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7th International Youth Conference on Radio Electronics, Electrical and Power Engineering, REEPE 2025

作者： Zou, Nan Yin, Muze Zhang, Guangpu Yang, Zhenqi Ma, Pengbo Li, Dongyu Harbin Engineering University National Key Laboratory of Underwater Acoustic Technology Harbin China Harbin Engineering University Ministry of Industry and Information Technology Key Laboratory of Marine Information Acquisition and Security Harbin China Harbin Engineering University College of Underwater Acoustic Engineering Harbin China Science and Technology on Electronic Information Control Laboratory Chengdu China

ISBN: (纸本)9798331531836

In this paper, we address the challenge of data association in scenarios involving multiple observers for underwater non-cooperative localization, where it is unclear how measurement data from different stations corresponds to the same target. We propose a novel data association method that leverages the inverse cotangent of azimuthal sequence features. The method first calculates the sequence of cotangent values measured by each station's bearing in a limited time. Linearly analyzes the sequence to obtain the slope, and finally realizes the data association according to the characteristic that the inverse cotangent value of the slope corresponds to the target's motion heading. The simulation results show that the proposed method has better association localization ability compared with the traditional method, overcomes the problem of the conventional method that the computational volume is too large when the number of observation stations and targets is large, and ensures the association correctness under a certain error. © 2025 IEEE.

关键词： azimuth inverse cotangent data association multi-station observation non-cooperative target underwater localization

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Impact of Evaporation Duct on Electromagnetic Wave Propagation During a Typhoon

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Journal of Ocean University of China 2022年第5期21卷 1069-1083页

作者： WANG Shuwen YANG Kunde SHI Yang YANG Fan ZHANG Hao School of Marine Science and Technology Northwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Ocean Acoustics and Sensing Northwestern Polytechnical UniversityMinistry of Industry and Information TechnologyXi’an 710072China National Key Laboratory of Underwater Information Processing and Control Xi’an 710072China

The evaporation duct,a result of evaporation from the ocean,is a region above the sea surface in which radio waves are refracted *** duct has strong effects on microwave *** cause huge anomalies in marine meteorological parameters that influence the evaporation duct distribution and structure,which in turn affects the propagation of electromagnetic(EM)***,EM wave propagation under the typhoon process has seldom been ***,taking Typhoon Phanfone(201929)as an example,this study uses a dataset from the European Centre for Medium-Range Weather Forecasts,combined with the Naval Atmospheric Vertical Surface Layer Model and the parabolic equation model,to study the evaporation duct’s impact on EM wave propagation during a *** spatial and temporal path loss distributions reveal that large amounts of EM wave energy are emitted from the evaporation duct when the EM wave passes through a typhoon *** average,a typhoon eye causes an approximately 20 dB increase in path loss for EM wave propagation at low antenna ***,the effects of a typhoon eye on EM wave propagation at different signal frequencies and antenna heights are *** results show that a typhoon has a larger impact on EM wave propagation with low signal frequency and high antenna height.

关键词： evaporation duct typhoon ECMWF wave glider electromagnetic wave propagation

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A Multi-Target Value Sequencing Method for underwater Mobile Observation Platforms Based on Motion Features

A Multi-Target Value Sequencing Method for Underwater Mobile...

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International Conference on Electronics technology (ICET)

作者： Yi Zheng Xiangfeng Yang Lei Shi Yunchuan Yang Science and Technology on Underwater Information and Control Laboratory Xi’an Precision Machinery Research Institute Xi’an China

ISBN: (数字)9798350363951

ISBN: (纸本)9798350363968

关键词： Measurement Sequential analysis Accuracy Correlation Dynamics Object detection Feature extraction

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Experimental study on the effect of underwater multiple degradation links on optical signal transmission 23

Experimental study on the effect of underwater multiple degr...

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Proceedings of the 2023 6th International Conference on Artificial Intelligence and Pattern Recognition

作者： Jianlei Zhang Pengwei Zhang Yunzhou Zhu Yuxin Tian School of Electronic Engineering Xi'an University of Posts & Telecommunications China Science and Technology on Underwater Information and Control Laboratory China

ISBN: (纸本)9798400707674

关键词： Air Bubbles Ocean Turbulence underwater Wireless Optical Communication

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