Abstract
Matched field processing (MFP) has been shown to be effective for remote sound source localization when the receiving array clearly records direct-path sound from a stationary source. Unfortunately, in imperfectly characterized confined environments, source motion, echoes, and reverberation commonly degrade localization performance. This poster presentation describes three acoustic technology development efforts focused on using matched-field processing, with and without the first reflections, (i) to track a moving source, (ii) to improve localization results by adjusting the receiving array geometry, and (iii) to determine the conditions under which a discrete scatterer may be localized. Experiments were conducted in a 1.0-meter-deep and 1.07-meter-diameter cylindrical water tank using a single sound projector, a receiving array of 16 hydrophones, and a linear actuator capable of moving the source at a speed of 0.5 m/s. Measured localization performance is reported for impulsive (100 micro-second) and longer duration signals having center frequencies from 30 kHz to near 100 kHz. As expected, source and scatterer localization accuracy is found to be limited by reverberation. The eventual application of this research is localizing sub-visual cavitation bubbles and other hydroacoustic sound sources in hydrodynamic test facilities. [Work supported by NAVSEA through the Naval Engineering Education Center.]
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