Analysis of impulsive biological noise due to snapping shrimp as a point process in time

Legg, Matthew; Zaknich, Anthony; Duncan, Alec J.; Greening, Michael V.

doi:10.1109/oceanse.2007.4302279

Cited by 24 publications

(18 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The random and sudden state transients in electromagnetic conditions, such as the unpredictable activities of marine creatures (such as shrimps) in acoustic communications [10,28], or the appliance electric switching or other uncoordinated transmissions in PLC systems [12,29], will probably lead to impulsive noise. The resulting impulsive noises, despite the sparsity in the time domain, usually have the extremely strong power, which will significantly degrade the transmission performance of OFDM systems that are sensitive to amplitude distortions.…”

Section: Impulsive Noisementioning

confidence: 99%

Cascading polar coding and LT coding for radar and sonar networks

Jin

Zhao

et al. 2016

J Wireless Com Network

View full text Add to dashboard Cite

In radar and sonar networks, heavy clutter and noise have generated strong impairments to information transmission and processing. Coding techniques have been widely used to cope with various channel noises and thereby to improve transmission performance. In the study, we investigate a novel cascaded coding scheme for systems operating in adverse electromagnetic environments, e.g., underwater acoustic communications (UAC), where the impulsive noise will be inevitable and the bit error ratio (BER) of receiver will be deteriorated greatly. Our cascaded encoding scheme employs the polar code as inner code while the Luby transform (LT) code as outer code. Inspired on a novel conception of channel polarization, the polar code uses a group of idea sub-channels to carry the useful information, while let other bad sub-channels bear no information. By cascading the outer LT code which accomplishes some parity check to the input of inner code, the performance of inner polar code is improved, as the decoding of polar code relies on a successive cancelation technique which is relatively sensitive to initial input. Error correcting performance of the new cascaded code is studied under impulsive noise characterized by a Middleton Class-A model. Simulations validate the proposed cascaded coding scheme. Compared with the popular low-density parity check (LDPC) code, the cascaded scheme can significantly improve the BER performance in the presence of impulsive interference, which also surpasses another cascaded code that is proved to be effective in impulsive noise channel, i.e., cascaded LDPC and LT coding scheme.

show abstract

Section: Impulsive Noisementioning

confidence: 99%

Cascading polar coding and LT coding for radar and sonar networks

Jin

Zhao

et al. 2016

J Wireless Com Network

View full text Add to dashboard Cite

show abstract

“…Although complex snap detection algorithms exist, simple threshold detection techniques [8], [9] work remarkably well for our application. The threshold for snap detection was set as multiple of the standard deviation σ of the sensor noise.…”

Section: A Snap Detectionmentioning

confidence: 99%

Ambient Noise Imaging through joint source localization

Kuselan

Pallayil

2011

Oceans'11 MTS/Ieee Kona

View full text Add to dashboard Cite

Abstract-Underwater Ambient Noise Imaging (ANI) systems rely on the acoustic illumination produced by natural noise sources to image an object of interest. Snapping shrimp are a dominant natural source of illumination in tropical waters and their snaps occur randomly. Hence incoherent energy detection methods, which require no knowledge of the source locations, are usually employed to form images of the objects. This approach, although simple, only produces images when the anisotropy in ambient noise is conducive. Even in anisotropic noise, some sources 'illuminate' the target while others obscure it. In this paper we describe a different approach. We use a snap detection algorithm to estimate the locations of the noise sources on the sea-bottom and then use the sound from these sources to passively range and form images of the objects. By using only the noise from sources that provide us good illumination and rejecting undesirable sources, we improve the image quality. The feasibility of this approach has been experimentally demonstrated with the data collected during a recent deployment of ROMANIS, an ANI camera developed in Singapore.

show abstract

“…Amongst the more prominently mentioned in the literature are: chela shape (Kim et al, 2010), the rate and style of snapping closure (Ritzmann, 1974;Mellon and Stephens, 1979;Mellon, 1981), and the gender of the shrimp -males of similar size to females generate bubbles with higher velocity (Herberholz and Schmitz, 1999) whilst also possessing stouter chelae than similar-sized females. While there are several researchers who have considered the acoustics of snapping (Everest et al, 1948;Au and Banks, 1997;Legg et al, 2007) and the physics associated with cavitation bubble collapse (Versluis et al, 2001;Chitre et al, 2003), neither the compressive pressures nor the heat energy within the socket during plunger compaction have been reported in the literature. To date, very little has been reported on the snapping shrimp dactyl plunger.…”

Section: Introductionmentioning

confidence: 99%

The snapping shrimp dactyl plunger: a thermomechanical damage-tolerant sandwich composite

Alam

Sanka

Alam³

et al. 2018

Zoology

View full text Add to dashboard Cite

The dactyl plunger of Alpheus sp. was found to be a layered composite, with mineral-rich outer and inner layers and a chitin-rich middle layer of high porosity. The chitin-rich middle layer is itself composed of several porous chitin laminae. Modelling heat conduction through the plunger cross-section revealed that the chitin-rich layer is able to insulate heat and retard its progress through the material. Heat accumulates in the plunger after a series of successive snaps and as such, its thermally resistant design can be considered most useful under the conditions of successive snapping. The plunger has a concurrent mechanical damage-tolerant design with biogenic mineral layers, viscous (chitin-mineral) interfaces, energy-dissipating porous chitin, and sidewalls composed of ordered, layered aragonite. The snapping shrimp plunger has a design that may protect it and internal soft tissues from thermomechanical damage during plunger-socket compression prior to cavitation bubble release.

show abstract

Analysis of impulsive biological noise due to snapping shrimp as a point process in time

Cited by 24 publications

References 14 publications

Cascading polar coding and LT coding for radar and sonar networks

Cascading polar coding and LT coding for radar and sonar networks

Ambient Noise Imaging through joint source localization

The snapping shrimp dactyl plunger: a thermomechanical damage-tolerant sandwich composite

Contact Info

Product

Resources

About