Sub-bottom high resolution sonar utilizing non-linear acoustic pulse self-demodulation
By: by Roy Lance Eyman, Peter John LeStrange, and Axel Harry Seemann
Contributors: LeStrange, Peter John; Seemann, Axel Harry
Publisher: Naval Postgraduate School; Available from National Technical Information Service
Published: 1982
Place of publication: Monterey, Calif; Springfield, Va
Language: eng
Number of pages: 147
Subjects: Physics
Description: An experiment involving the design and construction of a prototype sub-bottom high resolution sonar system utilizing nonlinear pulse self- demodulation and suitable for deep water use is described. It is possible to generate a low frequency wave using the self-demodulation of a short, high frequency, finite amplitude pulse produced by the non-linear properties of the medium. The generated low frequency wave will theoretically have the high directivity of the primary wave while simultaneously possessing the bottom penetrating characteristics of the lower frequency. Measurements demonstrate that the pulse self-demodulation occurs as theoretically predicted, and the results are successfully applied to the design of the sonar system. Shallow water tests demonstrating the potential effectiveness of the sonar system for detection and classification of target objects in bottom sediments are also described. (Author)
Notes: Thesis (M.S. in Eng Acoustics (Roy Lance and Peter LeStrange and) M.S. in Phys. (Harry Seemann)--Naval Postgraduate School, 1982.

Bibliography: l. 141-143.

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