Monopole-driven underwater sound source

2005 ◽  
Vol 117 (4) ◽  
pp. 1688
Author(s):  
Hans Thomas Rossby ◽  
James H. Miller
Keyword(s):  
Sound Source ◽  
Underwater Sound

scholarly journals ENGINEERING OF ACOUSTIC TECHNOLOGY FOR UNDERWATER POSITIONING OBJECT

2018 ◽  
Vol 10 (3) ◽  
pp. 629-637
Author(s):  
Billi Rifa Kusumah ◽  
Indra Jaya ◽  
Henry M. Manik ◽  
. Susilohadi
Keyword(s):  
Control System ◽  
Sound Source ◽  
Arrival Time ◽  
Equation Model ◽  
Control Device ◽  
Electromagnetic Signal ◽  
Positioning System ◽  
Underwater Sound ◽  
Underwater Positioning ◽  
The Difference

Underwater Positioning System (UPS) is a system to track the existence of the position of an object by utilizing the arrival time of the signal measurement. On land, the system uses an electromagnetic signal called GPS. However, because it cannot penetrate water effectively, an acoustic signal is used as an alternative. The purpose of this research is to engineer the control system of data acquisition and underwater acoustic device to measure arrival time (TOA) and apply equation model for underwater sound source positioning system. the effective frequency resonance of the transducer and the hydrophone is at a frequency of 6 kHz. The acquisition control device is able to measure the TOA signal with an error on a digital channel smaller than an analog channel. The difference between the TOA values measured by oscilloscope and acquisition control system is caused by inaccuracy of threshold estimates at the receiver's peak detector circuit. The position of the sound source coordinates obtained from the equation model shows the highest difference in depth point (z) compared to points (x) and (y), caused by the equation model used is limited to four hydrophone units forming a horizontal baseline.

A Passive Acoustic Positioning Algorithm Based on Virtual Long Baseline Matrix Window

2018 ◽  
Vol 72 (1) ◽  
pp. 193-206 ◽  
Author(s):  
Tao Zhang ◽  
Ziqiang Wang ◽  
Yao Li ◽  
Jinwu Tong
Keyword(s):  
Sound Source ◽  
Cross Correlation ◽  
Autonomous Underwater Vehicles ◽  
Underwater Sound ◽  
Positioning Systems ◽  
Long Baseline ◽  
Positioning Method ◽  
Passive Acoustic ◽  
Positioning Algorithm ◽  
Acoustic Positioning

A new acoustic positioning method for Autonomous Underwater Vehicles (AUV) that uses a single underwater hydrophone is proposed in this paper to solve problems of Long Baseline (LBL) array laying and communication synchronisation problems among all hydrophones in the traditional method. The proposed system comprises a Strapdown Inertial Navigation System (SINS), a single hydrophone installed at the bottom of the AUV and a single underwater sound source that emits signals periodically. A matrix of several virtual hydrophones is formed with the movement of the AUV. In every virtual LBL window, the time difference from the transmitted sound source to each virtual hydrophone is obtained by means of a Smooth Coherent Transformation (SCOT) weighting cross-correlation in the frequency domain. Then, the recent location of the AUV can be calculated. Simulation results indicate that the proposed method can effectively compensate for the position error of SINS. Thus, the positioning accuracy can be confined to 2 m, and the method achieves good applicability. Compared with traditional underwater acoustic positioning systems, the proposed method can provide great convenience in engineering implementation and can reduce costs.

A hydrodynamic siren as an underwater sound source

1988 ◽  
Vol 84 (S1) ◽  
pp. S152-S152
Author(s):  
Shigeru Yoshikawa ◽  
Kiyoshi Koyano
Keyword(s):  
Sound Source ◽  
Underwater Sound

scholarly journals Estimation Technique of the Direction for Sound Source by the Phase Difference from Sensing Underwater Sound

2008 ◽  
Vol 119 (0) ◽  
pp. 257-262
Author(s):  
Motonobu IMASATO ◽  
Nobuo KIRIYA ◽  
Hiroshi ASOU ◽  
Kuniyuki MATSUSHITA
Keyword(s):  
Phase Difference ◽  
Sound Source ◽  
Estimation Technique ◽  
Underwater Sound

scholarly journals Underwater Acoustic Localization Based on IR-GCC-PHAT in Reverberant Environments

2021 ◽  
Vol 15 ◽  
pp. 164-171
Author(s):  
Shingo Yoshizawa
Keyword(s):  
Sound Source ◽  
Time Difference ◽  
Underwater Sound ◽  
Multipath Interference ◽  
Underwater Acoustic ◽  
Acoustic Localization ◽  
Reverberant Environments ◽  
Simulation And Experiment ◽  
Time Position ◽  
Measurement Algorithm

This paper presents a method of underwater acoustic localization in reverberant environments. Time difference of arrival (TDOA) measurement algorithm is a key technology for estimating direction of arrival (DOA) of an underwater sound source. In strong multipath interference, the pseudo-peaks in a correlation function disturb the detection of a correct time position and lead to a large TDOA measurement error. The proposed algorithm computes a time difference by taking cross-correlation of two impulse responses and improves robustness to multipath interference. The comparison of TDOA algorithms is done by evaluating the position accuracy of underwater sound source in both simulation and experiment.

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