Introduction of Typical Modern Digital Sonar

Li, Qihu

doi:10.1007/978-3-642-18290-7_8

Cited by 2 publications

(2 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While passive sonar does not emit any signal and is mainly used in military applications, active sonar sends an acoustic signal into the water and captures the echoes to compute the desired characteristics. The characteristics include depth, materials, texture types, biology, and geology features [ 15 , 16 ]. There are several types of active sonar systems: multibeam, side scan, split-beam, sub-bottom profiling, and synthetic aperture sonar.…”

Section: Side-scan Sonar System Overviewmentioning

confidence: 99%

Estimation of the Acoustic Transducer Beam Aperture by Using the Geometric Backscattering Model for Side-Scan Sonar Systems

Nguyen

Luu

Nguyen

et al. 2023

Sensors

View full text Add to dashboard Cite

In this paper, we propose an algorithm for estimating the beam aperture of the acoustic transducers by using the geometric backscattering model for side-scan sonar systems. The geometric backscattering model is developed to describe the propagation paths of the signal transmitted from the transducers towards the seabed and backscatters to the hydrophones. To evaluate our proposed algorithm, we have developed a side-scan sonar system. The side-scan sonar system uses two transducers, operating on two different frequencies and focusing on two different wave beams, to scan the images of the seabed. The proposed algorithm provides the estimated beam apertures of each transducer. Our obtained results agree quite well with the parameters provided by the manufacturers. Moreover, these results are used to calibrate the scanned images. We provide the scanned sonar 3D images of the Dong Do lakebed, Vietnam, to justify our proposal.

show abstract

Section: Side-scan Sonar System Overviewmentioning

confidence: 99%

Estimation of the Acoustic Transducer Beam Aperture by Using the Geometric Backscattering Model for Side-Scan Sonar Systems

Nguyen

Luu

Nguyen

et al. 2023

Sensors

View full text Add to dashboard Cite

show abstract

“…Towed line array sonar is an acoustic detection system at a certain distance behind a ship, mainly consisting of an array, a towed cable, a winch, and a signal processor. It can detect the presence of a target and estimate the relevant parameters of the target by receiving the radiation noise of the sailing target itself or the active signal reflected by the target [5,6]. When processing array signals, the array is usually assumed to be straight.…”

Section: Introductionmentioning

confidence: 99%

Influence Analysis of Internal Solitary Wave on Towed Line Array Shape and Compensation Strategy

et al. 2021

View full text Add to dashboard Cite

Due to the flexibility of the towed line array, shear currents caused by an internal solitary wave (ISW) distort the array shape. This will lead to a mismatch between the conventional target detection algorithm and the array shape, resulting in a significant decline in the performance of the towed line array gain, azimuth resolution, etc. Based on the improved motion model of towed cable constructed by Ablow and Schechter (Ocean Eng, 10: 443-457, 1983), we propose a motion model of the towed line array under an ISW according to the Korteweg-De Vries (KdV) equation and solve the model by finite difference method combined with the Newton iteration method. In addition, the DFT beamforming theory is used to detect the target signal after the array shape distortion compensation to verify the validity of the model. The data analysis shows that the array shape distortion caused by the ISW is mainly affected by the relative position between the array and the ISW, the amplitude of the ISW, the fluid layer density, the fluid layer depth, the towing velocity, the tangential/normal drag coefficient, the elastic modulus, and the towed cable density. The influence of elastic modulus and the towed cable density on array shape distortion can be ignored. The detection results show that the output signal power is about 6 dB higher than the output noise power, and the array gain and azimuth resolution are improved after array shape distortion compensation.

show abstract

Introduction of Typical Modern Digital Sonar

Cited by 2 publications

References 53 publications

Estimation of the Acoustic Transducer Beam Aperture by Using the Geometric Backscattering Model for Side-Scan Sonar Systems

Estimation of the Acoustic Transducer Beam Aperture by Using the Geometric Backscattering Model for Side-Scan Sonar Systems

Influence Analysis of Internal Solitary Wave on Towed Line Array Shape and Compensation Strategy

Contact Info

Product

Resources

About