Detection of Embedded Objects using a parametric sonar
Overview
| Title: | Detection of Embedded Objects using a parametric sonar |
| Duration: | Three years |
| Sponsor: | EC MAST-III programme contract No: MAS3-CT95-0009 |
| Keywords: | Parametric sonar, buried objects, classification, non-linear sonar, scattering, cylindrical target |
Abstract
The DEO project is funded by the European Commission under the MAST - III programme. This is a three year programme started in January 1996 involving research groups from France, Italy, the Netherlands and the UK.
It has long been known that acoustic diffraction from underwater objects yield information about the object that can be used for detection's well as identification. However, when these objects are buried in sediments, the problem is more difficult because the target is masked by effects of the local acoustic environment. These effects include reverberation of the water sediment interface, multiple reflections occurring between the object and the interface, and modifications of the acoustic response of the object due to intrinsic properties of the sediment (attenuation, shear rigidity, porosity).
- The application of recent theories of diffraction to understand and explain the main physical processes of diffraction by a buried object.
- The analysis of bottom scattering reverberation.
- The use of a parametric sonars to obtain a low frequency / high directivity source and receiver array technology to localise the embedded object more accurately.
- The application of modern techniques of signal processing to improve the signal to noise ratio and the identification of the objects by a neural network.
People
Emeritus Professor Bryan Woodward,
Dr Paul Lepper
Dr Paul Connelly
Dr Jim Cook
Partners
Thomson Marconi Sonar (France) – coordinator
LU – Loughborough University (UK)
TNO Physics and Electronics Laboratory (Netherlands)
SACLANT Undersea Research Centre (Italy)
Publications
P.A. Lepper, B.Woodward
The development of a 75 kilohertz phase steered active parametric sonar system for sub-seabed target detection., Invited lecture: Acoustical Society of America Conference 2009, Portland, USA.
Lepper P.A. & Woodward B
Real-time correction of transmission platform instabilities using a parametric array,
28th Scandinavian Symposium on Physical Acoustics, Ustaoset, Norway, 23rd-26th January 2005.
B. Woodward, P.A. Lepper
Acoustic Detection and Classification of Fluid-filled Cylinders Embedded in Sediments
Proc. Oceans 2003 conference, 22-26 Sep., San Diego, USA, pp.1912-1916, 2003.
Tran Van Nhieu M., Gensane M., Fioravanti, S. Tesei A., Maguer A., Woodward B and Lepper P.A.
Detection of a buried water-filled cylindrical shell by wavelet transform technique;
Proc. of Fifth European Conference on Underwater Acoustics, ECUA 2000, Editor: Zakharia M.E., co-editors Chevret P. and Dubail P., Lyon, France, July 2000, Vol. II, pp. 1091-1096, ISBN: 92 828 9531 9, 2000.
Lepper P.A.
The development and testing of a parametric sonar system for use in sediment classification and the detection of buried objects;
Ph.D. Thesis, Dept. Electronic and Electrical Eng., Loughborough University, UK, January 2000.
Lepper P. A. and Woodward B.
Signal processing considerations for the detection and characterisation of objects on the seabed;
Proceedings of the Institute of Acoustics Conference on Sonar Signal Processing, 21-23 December 1998, Weymouth, UK, 1998.
Cook J. C., Goodson A. D., Lepper P. A. and Woodward B.
Measurement of acoustic scattering by a cylindrical shell using a parametric sonar;
Proceedings of the 4th European Conference on Underwater Acoustics, 21-25 September 1998, Rome, Italy, 1998
Cook J. C., Goodson A. D., Lepper P. A. and Woodward B.
The design and evaluation of a phase steered parametric sonar system intended for sediment characterisation;