Conclusion
We point out that images obtained with both systems don’t show any speckle patterns in the area where the redundancy is significant. Therefore, contrast and visibility of relatively small targets is enhanced. Non coherent imaging technique seems to be a promising technique for those who are interested in obtained high resolution imaging at low computational expense. It offers also good prospects in term of mapping rates. Our goal is now to implement this multi-look technique in a real time mapping tool.
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References
F.R. Castella, Application of one-dimensional holographic techniques to a mapping sonar system, Acoustical Holography, Vol. 3, 1970, pp. 247–271.
L.J. Cutrona, Comparison of sonar system performance achievable using synthetic aperture techniques with the performance achievable by more conventional means, J.A.S.A., Vol. 58, nº 2, August 1975, pp. 336–348.
J. Chatillon, M.E. Zakharia, M.E. Bouhier, Self-focusing of synthetic aperture sonar: validation from sea data, Proc. 2nd European Conference on Underwater Acoustics, Lyngby, Denmark, July 1994, pp. 727–731.
V. Tonard, J. Chatillon, Acoustical imaging of extended targets by means of synthetic-aperture sonar technique, Acustica, Acta Acoustica, Vol. 83, 1997, pp. 992–999.
D. Billon, F. Fohanno, Theoretical performance and experimental results for synthetic aperture sonar self-calibration, Oceans’98, September 1998, Nice, France.
G. Shippey, T. Nordkvist, Phased array acoustic imaging in ground coordinates, with extension to synthetic aperture processing, IEEE Proc. Radar Sonar Navigation, Vol. 143, nº 3, Juin 1996.
B.L. Douglas, H. Lee, C.D. Loggins, A multiple receiver synthetic aperture active sonar imaging system, Oceans’92, Conf. Records MTS, IEEE, pp. 300–305, 1992.
G. Kossoff, Progress in pulse echo techniques, Proc. 2nd World Congress Ultrasonics in Medicine, pp. 37–48, Rotterdam 1974.
P. D. Hansted, Simplified digital synthesis of ultrasonic images, Proc. of Royal Society of London 1981, A Vol. 374, pp.491–502.
P. De Heering, Alternates Schemes in Synthetic Aperture Sonar Processing, IEEE Journal of Oceanic Engineering, Vol. 9, nº 4, pp. 277–280, October 1984.
M.P. Hayes, P.T. Gough, Broad band synthetic aperture sonar, IEEE Journal of Oceanic Engineering, Vol. 17, nº 1, Janvier 1992.
P. Alais, P. Cervenka, P. Challande, V. Lesec, Non coherent synthetic aperture imaging, 24th ISAI, Santa Barbara 1998, to be published in “Acoustical Imaging”, Plenum Press.
F. Ollivier, P. Alais, P. Cervenka, A high resolution bathymetric sidescan sonar using dynamic focusing and beam steering, proc. 22nd ISAI, Florence 1996, “Acoustical Imaging”, Plenum Press, pp. 573–581.
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Alais, P., Cervenka, P., Challande, P., Janvrin, P., Marchal, J. (2002). Two Underwater Examples of Imaging by Multi-Look Synthesis. In: Halliwell, M., Wells, P.N.T. (eds) Acoustical Imaging., vol 25. Springer, Boston, MA. https://doi.org/10.1007/0-306-47107-8_30
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DOI: https://doi.org/10.1007/0-306-47107-8_30
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