Accession Number:

ADA209939

Title:

Experimental Study of Remote Sensing of Particle Motion by Crosscorrelation of Acoustic Backscatter

Descriptive Note:

Final rept. 1 Jun 1987-30 Sep 1988

Corporate Author:

TEXAS UNIV AT AUSTIN APPLIED RESEARCH LABS

Personal Author(s):

Report Date:

1989-02-07

Pagination or Media Count:

89.0

Abstract:

There are particles suspended in the ocean, such as bubbles and biological debris, which can backscatter acoustic waves. In a previous design study, it was determined that the backscatter from a collection of particles could produce a detectable and unique acoustic signature. Since the particles are often passive riders, it would be feasible to track the movement of the water by using a sonar and a crosscorrelation method. The acoustic signature of scatterers and the operation of an acoustic tracker were simulated on a computer. A signal simulator generates a set of backscattered signals for a multibeam sonar system. The scatterers are pinged as their positions are changed in a way that simulates flows and eddies in the water. Cross-correlating signals from successive pings, a reasonably accurate portrayal of the water motion was demonstrated for irrotational motion. A small experimental sonar was constructed and tested in a laboratory tank and in the field. In the tank, the sonar was used to track a moving wall and a bubble stream. In the field, the sonar was used to track naturally occurring bubbles. Keywords Sonar Remote sensing Correlation Flow measurement.

Subject Categories:

  • Acoustic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE