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Directional Echo-sounding

Published online by Cambridge University Press:  18 January 2010

E. A. Howson  and
J. R. Dunn
E. A. Howson
Affiliation:
(University of Birmingham)
J. R. Dunn
Affiliation:
(University of Birmingham)
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Extract

A description is given of sea trials of two types of narrow-beam echo-sounder developed with a view to obtaining information as regards both the depth and the slope of the seabed. One system involves a two-channel interferometric arrangement, which provides a family of several spaced receiving beams; the other uses an eight-element hydrophone array with electronic sector-scanning of the resultant narrow beam. Photographs of typical displays show that comparable values may be derived for the slope of the seabed beneath the ship for both systems in simple situations. Difficulties in interpretation of the interferometer record with more complex slopes render the use of the electronically-scanned system advisable in such circumstances.

Type
Research Article
Information
The Journal of Navigation , Volume 14 , Issue 3 , July 1961 , pp. 348 - 359
Copyright
Copyright © The Royal Institute of Navigation 1961

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References

REFERENCES

1Northrop, J., Blaik, M. and Frassato, R. (1959). Bathymetry of the Gibbs Hill Area, Bermuda, Deep-Sea Research, 5, 290. (This article gives a good bibliography on the subject of slope effects.)Google Scholar
2Tucker, D. G. (1959). Electronic sector-scanning asdic. This Journal, 12, 184.Google Scholar
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3bTucker, D. G. (1959), et al. Underwater echo-ranging with electronic sector scanning; sea trials on R.R.S. Discovery II, J. Brit. I.R.E., 19, 681.Google Scholar
4Tucker, D. G. (1960). Directional echo sounding, Int. Hydrog. Rev., 37, 43.Google Scholar
5Welsby, V. G. Multiplicative receiving arrays: the angular resolution of targets in a sonar system with electronic scanning, J. Brit. I.R.E., in course of publication.Google Scholar
6Tucker, M. J. Beam identification in multiple-beam echo-sounders, Int. Hydrog. Rev., in course of publication.Google Scholar