ASA 125th Meeting Ottawa 1993 May

3aUW5. Acoustic imaging with a bottom-mounted sonar.

Darrell R. Jackson

Appl. Phys. Lab., College of Ocean and Fishery Sci., Univ. of Washington, Seattle, WA 98105

Phase-coherent processing of data from a bottom-mounted, circularly scanning sonar provides a view of the time evolution of the seafloor that is unlike that obtained with conventional sonar. These techniques were developed under the ONR STRESS program, and will be illustrated using data from the STRESS experiment as well as from a later experiment. Ping-ping correlation is used to provide images of cumulative change in the bottom as well as images of current rate of activity. Correlation between echo signals received on the upper and lower halves of the receiving array provides images of fine-scale bathymetry. Time series of all these image types will be presented as false-color movies. Means of extracting quantitative measures from the images will be discussed.