Accession Number : ADA296540

Title :   A Comparison of Data Fusion Techniques for Target Detection with a Wide Azimuth Sonar.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s) : Engebretson, Kent R.

PDF Url : ADA296540

Report Date : MAY 1995

Pagination or Media Count : 127

Abstract : A group at the Charles Stark Draper Laboratory developed a concept for a mine reconnaissance platform called Intelligent Sonobuoy. This platform utilizes a low frequency sonar with wide aspect angle coverage. Furthermore the platform is designed to drift past an area of interest and thus obtain multiple detections from each sonar target. This thesis examines methods of fusing together those detections into a composite map of the target field in order to detect and localize those sonar targets. A technique based on hypothesis testing and maximum likelihood estimation is first derived and then applied to simulated data. Lastly, the system is validated on actual test data obtained in Mendum's Pond, New Hampshire during the summer and Fall of 1994. This system is shown to be effective at resolving targets to within a few meters. A competing approach based on the Hough transform is next examined. This clustering technique is applied to find the change in target location with respect to the buoy's position. The system works for simulated test data with a small number of detections. System performance declines rapidly as the number of detections increases and the system does not work well with the actual test data. (KAR) p. 4

Descriptors :   *METHODOLOGY, *COMPARISON, *DATA FUSION, *TARGET DETECTION, *SONAR, TEST AND EVALUATION, DATA PROCESSING, SIMULATION, POSITION(LOCATION), EXPERIMENTAL DATA, DETECTION, MAXIMUM LIKELIHOOD ESTIMATION, THESES, TARGETS, DRIFT, CLUSTERING, PLATFORMS, MAPS, HYPOTHESES, AZIMUTH, RECONNAISSANCE, AREA COVERAGE, LOW FREQUENCY, WIDE ANGLES, SONOBUOYS, ASPECT ANGLE, NEW HAMPSHIRE, BUOYS, MINES(ORDNANCE), SONAR TARGETS.

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE