Experimental Study of Remote Sensing of Particle Motion by Crosscorrelation of Acoustic Backscatter
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 07, 1989
- Accession Number
- ADA209939
Entities
People
- Nicholas P. Chotiros
Organizations
- University of Texas at Austin