Amplitude modulation of underwater noise produced by seagoing vessels

Kudryavtsev, A. A.; Luginets, K. P.; Mashoshin, A. I.

doi:10.1134/1.1560380

Cited by 16 publications

(3 citation statements)

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“…Such technologies, including the hydrophone Buoy (Stolkin et al, 2006) or the simplest and low‐cost Portable Noise Recorder System (Salloum et al, 2018), are able to detect, track, and classify vessels based on their noise signature (Fillinger et al, 2011; Simard et al, 2016; Pollara et al, 2017; yellow square in Figure 4). Such harmonic footprint is modulated by mechanical characteristics of the vessels (e.g., engine size, propellers cavitation; Kudryavtsev et al, 2003; Pollara et al, 2017), and as a result, a noise‐based classification of vessels can be conducted (Santos‐Domínguez et al, 2016). Moreover, the passive nature of AT and autonomous noise recorders provide a low‐cost monitoring strategy not only economically but also logistically, since these systems can cover the surveillance of several kilometres (detection distance could reach ~24 km in the open sea, Salloum et al, 2018).…”

Section: Sdg14 Target 6—preventing Illegal Unreported and Unregulated...mentioning

confidence: 99%

Toward a decade of ocean science for sustainable development through acoustic animal tracking

Alós

Aarestrup

Abecasis

et al. 2022

Global Change Biology

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Section: Sdg14 Target 6—preventing Illegal Unreported and Unregulated...mentioning

confidence: 99%

Toward a decade of ocean science for sustainable development through acoustic animal tracking

Alós

Aarestrup

Abecasis

et al. 2022

Global Change Biology

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“…By analyzing this modulation spectrum, valuable information such as the ship's propeller speed, number of blades on the ship can be obtained. These parameters are crucial for determining the physical characteristics of a stable ship [3,4]. Nevertheless, the data on the ship's radiated noise observed through sonar in the ocean waveguide encompasses not only details about different noise sources and the ship's operational conditions and physical characteristics, but is also influenced by the ocean waveguide factors [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

The impact of shallow waveguides on the spectral characteristics of modulated spectral lines in underwater radiated noise produced by ships

Li,

Zhang,

Lin

et al. 2024

J. Phys.: Conf. Ser.

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The modulation spectrum line spectrum of undersea radiated noise from ships is a significant characteristic in the identification of ship targets. This research presents an analysis of the impact of waveguide dispersion effect and demodulation bandwidth on the intensity of modulation line spectrum, based on the theoretical framework of square demodulation method. The physical mechanism underlying this influence is derived and discussed. The examination of collected data and numerical simulations demonstrates that the extracted modulated line spectrum intensity in an unobstructed environment effectively utilizes the carrier’s energy and generally does not exhibit any abnormal loss during propagation. However, in a shallow sea dispersive waveguide, as the propagation distance increases, a transimission loss anomaly of over 3dB occurs in the modulated line spectrum. The theoretical derivation yields implications that can offer theoretical backing for the reduction of vibration and noise in underwater targets, extraction of faint signals from high-order line spectra in the distant field, and identification of targets.

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“…Evaluation of that modulation provides information on the ship, such as the shaft rotation frequency, that can be used for ship classification. The method for estimation of the envelope modulation is known as DEMON (Detection of Envelope Modulation on Noise) [11][12][13][14][15][16][17] and the earlier papers describing this method were published about 50 years ago [11]. The DEMON spectra were the basis for various algorithms of ship classification.…”

Section: Introductionmentioning

confidence: 99%

DEMON Acoustic Ship Signature Measurements in an Urban Harbor

Chung

Sutin

Sedunov

et al. 2011

Advances in Acoustics and Vibration

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Detection, classification, and tracking of small vessels are important tasks for improving port security and the security of coastal and offshore operations. Hydroacoustic sensors can be applied for the detection of noise generated by vessels, and this noise can be used for vessel detection, classification, and tracking. This paper presents recent improvements aimed at the measurement and separation of ship DEMON (Detection of Envelope Modulation on Noise) DEMON acoustic signatures in busy harbor conditions. Ship signature measurements were conducted in the Hudson River and NY Harbor. The DEMON spectra demonstrated much better temporal stability compared with the full ship spectra and were measured at distances up to 7 km. The combination of cross-correlation and methods allowed separation of the acoustic signatures of ships in busy urban environments.

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Amplitude modulation of underwater noise produced by seagoing vessels

Cited by 16 publications

References 1 publication

Toward a decade of ocean science for sustainable development through acoustic animal tracking

Toward a decade of ocean science for sustainable development through acoustic animal tracking

The impact of shallow waveguides on the spectral characteristics of modulated spectral lines in underwater radiated noise produced by ships

DEMON Acoustic Ship Signature Measurements in an Urban Harbor

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