Wide aperture arrays for locating impulsive sound sources in air and underwater

Brian G. Ferguson

doi:10.1117/12.673731

19 May 2006 Wide aperture arrays for locating impulsive sound sources in air and underwater

Brian G. Ferguson

Proceedings Volume 6231, Unattended Ground, Sea, and Air Sensor Technologies and Applications VIII; 62310X (2006) https://doi.org/10.1117/12.673731
Event: Defense and Security Symposium, 2006, Orlando (Kissimmee), Florida, United States

Abstract

Passive ranging techniques are used in land-based acoustic surveillance systems and underwater sonar systems to localize sources that radiate acoustic energy into the environment. Passive ranging by wavefront curvature relies on the spherical expansion of the wavefronts as the acoustic energy propagates outwards from the source. A wide-aperture receiving array is used to sense the curvature of the wavefront by estimating the intersensor time delays as the wavefront traverses the array. The time delay estimates are used to calculate the range (which is equal to the radius of curvature of the wavefront) and bearing of the source. The wavefront curvature method is applied here to the passive ranging of sources of four different types of acoustic signals: underwater mechanical transients, underwater biological transients, continuous sound wave transmissions in air and impulsive sounds in air. The method provides precise range and bearing estimates of underwater signal sources. In comparison, large passive ranging errors are observed for in-air sources because the atmosphere is a nonstationary sound propagation medium. Atmospheric turbulence causes perturbations in the curvature of the acoustic wavefronts and leads to random fluctuations in the source position estimates on time scales ranging from seconds to minutes. Background noise at each sensor has only a small effect on the positional uncertainty of in-air sources with random fluctuations in the source position estimates occurring on subsecond time scales.

Citation Download Citation

Brian G. Ferguson "Wide aperture arrays for locating impulsive sound sources in air and underwater", Proc. SPIE 6231, Unattended Ground, Sea, and Air Sensor Technologies and Applications VIII, 62310X (19 May 2006); https://doi.org/10.1117/12.673731

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