Accession Number : ADA623364


Title :   Synthetic Aperture Acoustic Imaging for Roadside Detection of Solid Objects


Descriptive Note : Final rept. 17 Mar 2009-16 Feb 2014


Corporate Author : CATHOLIC UNIV OF AMERICA WASHINGTON DC


Personal Author(s) : Vignola, Joseph ; Judge, John ; Good, Chelsea


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a623364.pdf


Report Date : 20 Nov 2014


Pagination or Media Count : 63


Abstract : A synthetic aperture acoustic system was developed to detect roadside threats including IEDs and landmines. The technique uses audio-band sound broadcast from a compact trailer-mounted system to image the roadside perpendicular to the travel path. The area adjacent to the travel path is insonified and the microphone records the reflected acoustic signal. The travel of the transceiver creates a synthetic aperture that allows imaging of the scene. During the earlier phase of the project, a compact system was deployed, and experiments with pulse diversification was undertaken as well as a study of the effects of travel speed and path errors. Data was collected at Fort AP Hill, and at the Night Vision Laboratory. The processed data were and further analyzed for characteristics and features amenable for discrimination. Additional design specification for a vehicle based SAA system was developed in conjunction Night Vision staff. Work related to measuring acoustic properties of both natural and anthropogenic materials relevant to outdoor imaging was executed. This work required the development of hardware such as vertical impedance tubes for both low (200-2000Hz) and mid frequency (500-8000Hz) ranges. The report presents and discusses results for several case studies of SAA imaging and acoustic material property characterization.


Descriptors :   *ACOUSTIC DETECTION , *IMPROVISED EXPLOSIVE DEVICES , *SYSTEMS ENGINEERING , *TARGET DETECTION , ACOUSTIC ARRAYS , ACOUSTIC EQUIPMENT , ACOUSTIC SIGNALS , BACKSCATTERING , CASE STUDIES , DIELECTRIC PROPERTIES , ERROR ANALYSIS , FEATURE EXTRACTION , GROUND VEHICLES , IMAGE PROCESSING , MICROPHONES , NIGHT VISION , SOIL MECHANICS , SPATIAL DISTRIBUTION , TRANSMITTER RECEIVERS


Subject Categories : Soil Mechanics
      Surface Transportation and Equipment
      Unconventional Warfare
      Acoustic Detection and Detectors


Distribution Statement : APPROVED FOR PUBLIC RELEASE