Outdoor synthetic aperture acoustic ground target measurements

Steven Bishop; Therese-Ann Ngaya; Joe Vignola; John Judge; Jay Marble; Peter Gugino; Mehrdad Soumekh; Erik Rosen

doi:10.1117/12.851802

29 April 2010 Outdoor synthetic aperture acoustic ground target measurements

Steven Bishop, Therese-Ann Ngaya, Joe Vignola, John Judge, Jay Marble, Peter Gugino, Mehrdad Soumekh, Erik Rosen

Proceedings Volume 7664, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XV; 76641Y (2010) https://doi.org/10.1117/12.851802
Event: SPIE Defense, Security, and Sensing, 2010, Orlando, Florida, United States

Abstract

A novel outdoor synthetic aperture acoustic (SAA) system consists of a microphone and loudspeaker traveling along a 6.3-meter rail system. This is an extension from a prior indoor laboratory measurement system in which selected targets were insonified while suspended in air. Here, the loudspeaker and microphone are aimed perpendicular to their direction of travel along the rail. The area next to the rail is insonified and the microphone records the reflected acoustic signal, while the travel of the transceiver along the rail creates a synthetic aperture allowing imaging of the scene. Ground surfaces consisted of weathered asphalt and short grass. Several surface-laid objects were arranged on the ground for SAA imaging. These included rocks, concrete masonry blocks, grout covered foam blocks; foliage obscured objects and several spherical canonical targets such as a bowling ball, and plastic and metal spheres. The measured data are processed and ground targets are further analyzed for characteristics and features amenable for discrimination. This paper includes a description of the measurement system, target descriptions, synthetic aperture processing approach and preliminary findings with respect to ground surface and target characteristics.

Citation Download Citation

Steven Bishop, Therese-Ann Ngaya, Joe Vignola, John Judge, Jay Marble, Peter Gugino, Mehrdad Soumekh, and Erik Rosen "Outdoor synthetic aperture acoustic ground target measurements", Proc. SPIE 7664, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XV, 76641Y (29 April 2010); https://doi.org/10.1117/12.851802

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