ASA 129th Meeting - Washington, DC - 1995 May 30 .. Jun 06

1pAO14. Determination of the inhomogeneity position by the time structure of a scattered signal.

Vladimir N. Fokin

Margarita S. Fokina

Inst. of Appl. Phys., Russian Acad. of Sci., 46, Ulyanov St., 603600, Nizhny Novgorod, Russia

The method is based on the fact that the mean velocity of sound pulse propagation along the ray trajectory depends on the angle of the ray exit. The efficiency of the method is analyzed numerically for the signal reception at a horizontal array and a single hydrophone. It is shown that the signal of illumination may be suppressed and the scattered signal may be separated by time gating. It is also shown that the depth of the deposition of a space-localized inhomogeneity may be estimated by the width of the scattered signal autocorrelation function. The distance to the inhomogeneity may be defined by the cross-correlation function of the scattered signal at various array receivers. The influence of the depth of the submergence of a scatterer and the distance between a source and a receiver on the scattered signal structure is analyzed. [Work supported by RFFI project N 94-05-1725-a.]