A phase steered parametric array for sub-bottom profiling

Author

Woodward, B. ; Cook, J.C. ; Goodson, A.D. ; Lepper, P.A.

Author_Institution

Loughborough Univ. of Technol., UK

fYear

1994

fDate

19-21 Jul 1994

Firstpage

77

Lastpage

82

Abstract

The non-linear sonar developed at Loughborough University of Technology for sub-bottom profiling now meets the specifications of the REBECCA programme [Woodward et al., 1993]. At 5 kHz it gives a source level of approximately 196 dB re 1 μPa at 1m and a beam of approximately 2.50 x 2.50, A -3 dB bandwidth of +/- 3 kHz should be available at 5 kHz, permitting pulses as short as 200 μs to be transmitted. The phase steering characteristics also appear satisfactory over a +/-20° sector. This steering capability will be further developed to ensure that the selected NLA beam incidence angle to the seabed remains constant. Sensed towfish attitude errors should therefore be dynamically correctable an one axis

Keywords

acoustic arrays; acoustic parametric devices; geophysical equipment; sonar; underwater sound; 5 kHz; Loughborough University of Technology; NLA beam incidence angle; REBECCA programme; nonlinear sonar; phase steered parametric array; phase steering characteristics; seabed; source level; steering capability; subbottom profiling; towfish attitude errors;

fLanguage

English

Publisher

iet

Conference_Titel

Electronic Engineering in Oceanography, 1994., Sixth International Conference on

Conference_Location

Cambridge

Print_ISBN

0-85296-619-9

Type

conf

DOI

10.1049/cp:19940579

Filename

337098