Abstract
As part of the Azores Fixed Acoustic Range measurement program, a series of experiments was undertaken to study the effects of the ocean surface on the propagation of acoustic signals in the specular direction. In particular, the following signal characteristics were investigated as a function of center frequency in the band 500–5000 Hz: signal time speed, frequency spread, amplitude statistics, phase statistics, and scattering loss. The experiments were carried out over a 1.5-NM path and a 18-NM path. The results appear to be simply related to the Rayleigh parameter of the ocean surface. In conjunction with the acoustic experiments, measurements were made of the ocean surface characteristics. These measured characteristics were then used in the Kirchhoff approximation to the Helmholtz integral to predict the observed characteristics of the acoustic signals. The results show that the agreement between the theory and the measurements is quite good. [Work supported by NAVSEA.]
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
