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Proceedings Paper

Synthetic aperture acoustic imaging of canonical targets with a 2-15 kHz linear FM chirp
Author(s): Joseph F. Vignola; John A. Judge; Chelsea E. Good; Steven S. Bishop; Peter M. Gugino; Mehrdad Soumekh
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Paper Abstract

Synthetic aperture image reconstruction applied to outdoor acoustic recordings is presented. Acoustic imaging is an alternate method having several military relevant advantages such as being immune to RF jamming, superior spatial resolution, capable of standoff side and forward-looking scanning, and relatively low cost, weight and size when compared to 0.5 - 3 GHz ground penetrating radar technologies. Synthetic aperture acoustic imaging is similar to synthetic aperture radar, but more akin to synthetic aperture sonar technologies owing to the nature of longitudinal or compressive wave propagation in the surrounding acoustic medium. The system's transceiver is a quasi mono-static microphone and audio speaker pair mounted on a rail 5meters in length. Received data sampling rate is 80 kHz with a 2- 15 kHz Linear Frequency Modulated (LFM) chirp, with a pulse repetition frequency (PRF) of 10 Hz and an inter-pulse period (IPP) of 50 milliseconds. Targets are positioned within the acoustic scene at slant range of two to ten meters on grass, dirt or gravel surfaces, and with and without intervening metallic chain link fencing. Acoustic image reconstruction results in means for literal interpretation and quantifiable analyses. A rudimentary technique characterizes acoustic scatter at the ground surfaces. Targets within the acoustic scene are first digitally spotlighted and further processed, providing frequency and aspect angle dependent signature information.

Paper Details

Date Published: 23 May 2011
PDF: 11 pages
Proc. SPIE 8017, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XVI, 80170E (23 May 2011); doi: 10.1117/12.882547
Show Author Affiliations
Joseph F. Vignola, The Catholic Univ. of America (United States)
John A. Judge, The Catholic Univ. of America (United States)
Chelsea E. Good, The Catholic Univ. of America (United States)
Steven S. Bishop, U.S. Army Night Vision and Electronic Sensors Directorate (United States)
Peter M. Gugino, U.S. Army Night Vision and Electronic Sensors Directorate (United States)
Mehrdad Soumekh, Soumekh Consulting (United States)


Published in SPIE Proceedings Vol. 8017:
Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XVI
Russell S. Harmon; John H. Holloway; J. Thomas Broach, Editor(s)

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