Do dolphins benefit from nonlinear mathematics when processing their sonar returns?

  title={Do dolphins benefit from nonlinear mathematics when processing their sonar returns?},
  author={Timothy G. Leighton and Gim Hwa Chua and Paul R. White},
  journal={Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences},
  pages={3517 - 3532}
  • T. Leighton, G. Chua, P. White
  • Published 8 November 2012
  • Physics, Biology
  • Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
Dolphins have been observed to blow bubble nets when hunting prey. Such bubble nets would confound the best man-made sonar because the strong scattering by the bubbles generates ‘clutter’ in the sonar image, which cannot be distinguished from the true target. The engineering specification of dolphin sonar is not superior to the best man-made sonar. A logical deduction from this is that, in blowing bubble nets, either dolphins are ‘blinding’ their echolocation sense when hunting or they have a… 
Dolphin-inspired target detection for sonar and radar
Gas bubbles in the ocean are produced by breaking waves, rainfall, methane seeps, exsolution, and a range of biological processes including decomposition, photosynthesis, respiration and digestion.
Unscrambling Nonlinear Dynamics in Synthetic Aperture Radar Imagery
A novel procedure for characterizing the nonlinear dynamics in SAR imagery is proposed and three complementary 1-D abstractions for a 2-D SAR chip are introduced, which are found to be resolution dependent.
Timing and context of dolphin clicks during and after mine simulator detection and marking in the open ocean
Dolphins wore cameras so they could hear them and watch them mark mine simulators, and rhythmic click trains, victory squeals, and click packets were observed with their behavioral context.
Detection Performance Simulation Analysis of Echolocation Dolphin Click Signal under Seabed Reverberation Background
  • Yue Lei
  • Physics
    2019 IEEE International Conference on Power, Intelligent Computing and Systems (ICPICS)
  • 2019
The analysis of bottlenose dolphin click signal and its detection performance according to theoretical derivation and simulation analysis from the aspect of time and frequency domain, wideband ambiguity function and reverberation suppression, respectively show that the spectrum of click signal contain two Gaussian functions and cross-term's function.
Holism for target recognition in synthetic aperture radar imagery
Reductionism and holism are two worldviews that underlie the fields of linear and nonlinear signal processing, respectively. In the reductionist worldview, deviation from linearity is seen as a
Use of dolphin-like pulses to enhance target discrimination and reduce clutter
Their performance in reducing clutter and enhancing target discrimination is demonstrated in the laboratory, and the opportunities for using the same scheme to improve the detection of hidden electronic devices or semiconductor devices by radar are discussed.
Bubble acoustics: from whales to other worlds
Gas bubbles in liquids have an extraordinary ability to interact with sound fields. They are potent generators, absorbers, and scatterers of sound, and can have a profound effect upon the sound speed
The acoustic bubble: Oceanic bubble acoustics and ultrasonic cleaning
Bubbles interact strongly with sound fields. Gas bubbles in the oceangenerate sound as they are produced by breaking waves, rainfall, methane seeps, etc., and such emissions can be used to size and
Effects of a grain ahead on dolphin's transmitting performance
  • W. Feng, Yu Zhang
  • Physics
    2017 IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC)
  • 2017
A finite element approach was applied to numerically simulate the acoustic field around a dolphin with a small grain ahead of it to better understanding how the dolphin's transmitting performance is affected by inhomogeneous medium such as an unwanted small grain.
Radar clutter suppression and target discrimination using twin inverted pulses
The proposition that the use of twin inverted pulses could enhance radar is tested. This twin inverted pulse radar (TWIPR) is applied to five targets. A representative target of interest (a dipole


The Dolphin Sonar: Excellent Capabilities In Spite of Some Mediocre Properties
Dolphin sonar research has been conducted for several decades and much has been learned about the capabilities of echolocating dolphins to detect, discriminate and recognize underwater targets. The
Use of clicks resembling those of the Atlantic bottlenose dolphin (Tursiops truncatus) to improve target discrimination in bubbly water with biased pulse summation sonar
Dolphins are known to outperform man-made sonar in detecting and classifying targets in a shallow water environment where the returned signal is dominated by clutter in the vicinity of targets.
Bio-inspired wideband sonar signals based on observations of the bottlenose dolphin (Tursiops truncatus).
Advanced time-frequency signal analysis techniques are used to generate new models for bio-inspired sonar signals and it is suggested that target discrimination could be improved through the transmission of a signal packet in which the chirp structure is varied between pulses.
Echolocation characteristics of free-swimming bottlenose dolphins during object detection and identification.
The distribution of echolocation click-peak frequencies suggested a bias in the dominant frequency components of clicks, possibly due to mechanical constraints of the click generator.
Special section on biologically-inspired radar and sonar systems - Why dolphin biosonar performs so well in spite of mediocre 'equipment'
Dolphins have been found to have an excellent sonar system that is able to detect and recognise targets in noisy and highly reverberant environments. However, their `equipment` has only mediocre
Acoustics of echolocating dolphins and small whales
The acoustic reception system of dolphins is discussed and topics such as auditory sensitivity, spectral analysis capabilities and directional hearing are considered, as well as properties of echolocation signals and propagation of the echlocation signals from the animals’ head.
Modeling the detection range of fish by echolocating bottlenose dolphins and harbor porpoises.
The target strength as a function of aspect angle were measured for four species of fish using dolphin-like and porpoise-like echolocation signals and showed considerably less fluctuation with azimuth than would a pure tone pulse.
Clutter suppression and classification using twin inverted pulse sonar (TWIPS)
This paper describes the detection and classification of targets against clutter by distinguishing between linear and nonlinear scatterers and, further, by distinguishing those nonlinear targets that
Propagation through nonlinear time-dependent bubble clouds and the estimation of bubble populations from measured acoustic characteristics
For several decades the propagation characteristics of acoustic pulses (attenuation and sound speed) have been inverted in attempts to measure the size distributions of gas bubbles in liquids. While
Clutter suppression and classification using twin inverted pulse sonar in ship wakes.
Twin inverted pulse sonar (TWIPS) is deployed in the wake of a moored rigid inflatable boat with propeller turning, and then in thewake of a moving tanker of 4580 dry weight tonnage to test its ability to distinguish between scatter from the wake and scatter fromThe seabed.