The Sonar Simulation Toolset

Goddard, Robert P.

doi:10.1109/oceans.1989.587510

Cited by 20 publications

(6 citation statements)

References 9 publications

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“…A key part of this effort is the use of SST (Goddard, 2008) to simulate the propagation of communication sequences through the underwater acoustic environment. SST allows a user to specify an ocean environment with a wide variety of parameters relevant to acoustic signal propagation and reception: sound speed profile, bathymetry, surface and bottom characteristics, ambient noise levels, etc.…”

Section: Approachmentioning

confidence: 99%

Differential Frequency Hopping (DFH) Modulation For Mobile Underwater Sensor Networks

Cazzanti¹,

Das²

2011

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Section: Approachmentioning

confidence: 99%

Differential Frequency Hopping (DFH) Modulation For Mobile Underwater Sensor Networks

Cazzanti¹,

Das²

2011

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“…If enough scatterers are used in each sonar resolution cell, the resulting signal will approach a Gaussian distribution by virtue of the Central Limit Theorem. Early versions of SST [Goddard 1989] and REVGEN [Princehouse 1975, Princehouse 1978, Goddard 1986] used variants of that approach. Unfortunately, as the system time-bandwidth product increases, the point scatterer approach becomes impractical, both because the required density of scatterers increases and because frequency dependence in the echo model becomes important.…”

Section: Externaltargetmentioning

confidence: 99%

The Sonar Simulation Toolset, Release 4.6: Science, Mathematics, and Algorithms

Goddard¹

2008

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“…COMPUTER SIMULATIONS A multibeam sonar system was simulated with SST (Sonar Simulation Toolset) [9], a high-fidelity sonar simulation program. SST creates synthetic reverberation by randomly distributing ideal point scatterers in the volume and the boundaries of the "ocean" and coherently combining the individual echoes at the receiver(s).…”

Section: The Eigenanalysis Modelzng Approachmentioning

confidence: 99%

Application of high-resolution beamforming to multibeam swath bathymetry

Pantzartzis

Moustier²,

Αλεξάνδρου³

Proceedings of OCEANS '93

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In t h e context of swath bathymetry with multibeam echo-sounders, seafloor echoes received a t regularly spaced elements of a hydrophone array a r e summed coherently to form a number of directional beams from which athwartships depth measurements are derived. This process can b e implemented as a conventional beamformer leading to estimates of the direction of arrival of the echoes for each time sample. T h e process is inadequate in resolving closely spaced synchronous returns and the accuracy of these estimates is proportional to the number of acoustic d a t a samples used in the process. To improve the angular resolution we have considered a number of high-resolution algorithms well known in power spectral estimation applications: autoregressive techniques (i.e.Yule-Walker , and unconstrained least squares), minimum variance methods (i.e. Capon's method), and eigenanalysis algorithms (i.e. MUSIC). Comparisous of results obtained with realistic multibeam sonar siinulations show that these algorithms have higher accuracy and better potential for high-resolution bathymetry thau t h e conventional beamformer under nominal SNR levels. I. INTRODIJCTIONIn multibeam echo-sounder systems the acoustic information a t the receiver sensors can be translated to sequences of direction of arrival versus time and then to bathymetry. For an effective and accurate survey of the seafloor the design of such sonar systems aspires to provide the widest cross-track coverage with the highest spatial resolution possible. Although these two requirements are often contradictory, a fair compromise can be achieved through a combination of array design and signal processing techniques.The spatial resolution of the bathymetric map generated from a multibeam sonar system is constrained by the bandwidth of the system, the aperture of the receiver arrays and the number of beams formed athwartships.The conventional FFT or time delay beamforming processes combined with the center of mass or split aperture correlator bottom detection algorithms are most commonly used in current bathymetric systems since they offer computationally efficient, acceptable resolution for real time bathymetry [I]. However, processing of sonar acoustic (lata with high-resolution power spectrum estirnation rnethods can resolve closely spaced bottom features present in the field of view of the receivrr array better than the conventional beamforming processes [2].The paper begins with a review of the conventional beamforming and bottom detection processes and the implied limitations in bathymetric resolution. Next, we describe the beamforming methods for high-resolution bathymetry. Finally, the obtained resolution performance from simulated data IS presented. The beamforming process is discussed under the assumption of plane waves in the far field of the acoustic sensors. Sensor data and weights are assumed complex, since in practical applications quadrature sampling is used at each sensor to generate inphase and quadrature (1 and Q) data. Narrow band signals (bandwidth ...

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The Sonar Simulation Toolset

Cited by 20 publications

References 9 publications

Differential Frequency Hopping (DFH) Modulation For Mobile Underwater Sensor Networks

Differential Frequency Hopping (DFH) Modulation For Mobile Underwater Sensor Networks

The Sonar Simulation Toolset, Release 4.6: Science, Mathematics, and Algorithms

Application of high-resolution beamforming to multibeam swath bathymetry

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