Sonar signal analysis: Biological consequences of out-of-band acoustic signals from active sonar systems

2018 ◽  
Vol 144 (3) ◽  
pp. 1920-1920
Author(s):  
Paul A. Lepper ◽  
Denise Risch
Keyword(s):  
Signal Analysis ◽  
Acoustic Signals ◽  
Active Sonar ◽  
Sonar Systems

Impact of strong direct blast on active sonar systems

2015 ◽  
Vol 51 (2) ◽  
pp. 894-909 ◽  
Author(s):  
Luzhou Xu ◽  
Jian Li ◽  
Akshay Jain
Keyword(s):  
Active Sonar ◽  
Sonar Systems

Performance comparison of target localization for active sonar systems

2008 ◽  
Vol 44 (4) ◽  
pp. 1371-1380 ◽  
Author(s):  
Suhwan Kim ◽  
Bonhwa Ku ◽  
Wooyoung Hong ◽  
Hanseok Ko
Keyword(s):  
Performance Comparison ◽  
Target Localization ◽  
Active Sonar ◽  
Sonar Systems

scholarly journals An Improved Velocity Estimation Method for Wideband Multi-Highlight Target Echoes in Active Sonar Systems

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 2794 ◽  
Author(s):  
Shuxia Huang ◽  
Shiliang Fang ◽  
Ning Han
Keyword(s):  
Matched Filter ◽  
Estimation Method ◽  
Velocity Estimation ◽  
Filter Method ◽  
Improved Method ◽  
Matching Algorithm ◽  
Active Sonar ◽  
Estimation Performance ◽  
Effective Performance ◽  
Sonar Systems

In active sonar systems, the target echoes are usually equivalent to a superposition of the Doppler-scaled reflections from multiple highlights. The reflections overlap with each other both in the time and frequency domain, which results in a decreased velocity estimation performance. Recently, the hyperbolic-frequency modulated signal has been widely employed in sonar systems for moving targets due to its Doppler tolerance, while the precise velocity estimation becomes a great challenge under such conditions. In this paper, the echo c is modeled onsidering a target with a constant velocity and multi-highlights. The velocity estimation performance is analyzed though the signal’s matched filter and the wideband ambiguity function. An improved method based on the sliding window matching algorithm is proposed to improve the performance. The method controls the energy of environmental noise and interference by focusing on the dominant target highlight, and applying a designed window which utilizes the Doppler characteristics of hyperbolic-frequency modulated signals. Simulations and lake experiment allow us to compare between the improved method and the conventional matched filter method. The results verify the influence of the multi-highlights in velocity estimation and indicate that the improved method has more effective performance.

Analysis on Signal Transmission Methods for Rapid Searching in Active SONAR Systems

2018 ◽  
Vol 55 (8) ◽  
pp. 83-93
Author(s):  
Woo-Sung Son ◽  
Young Kwang Seo ◽  
Wan-Jin Kim ◽  
Hyoung-Nam Kim
Keyword(s):  
Signal Transmission ◽  
Active Sonar ◽  
Sonar Systems

Pipeline Acoustic Pre-Warning System and Method of Signal Analysis

2008 ◽  
Author(s):  
Pengchao Chen ◽  
Yongjun Cai ◽  
Dongjie Tan ◽  
Yi Sun ◽  
Muyang Ai ◽  
...  
Keyword(s):  
Background Noise ◽  
Signal Analysis ◽  
Warning System ◽  
Acoustic Signals ◽  
Third Party ◽  
Feature Subset ◽  
Long Distance ◽  
Long Distance Transmission ◽  
Optimal Feature Subset ◽  
Optimal Feature

This paper describes a new acoustic pre-warning system for pipelines, aimed at preventing third party damage by monitoring the pipeline acoustic signals. Many environmental factors, such as the by-passing of vehicles and pedestrians, could introduce background noise into long distance transmission of pipeline acoustic signals. As a result, normal pipeline acoustic pre-warning system is disturbed to identify abnormal events. In this work, statistical methods were applied to signal analysis in order to extract feature parameters of different events. Then the optimal feature subset was obtained by gene arithmetic to differentiate hazardous events between normal events effectively. PetroChina has applied the new pre-warning system to their long distance transmission pipelines and the system operates well.

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