Advanced array techniques for unattended ground sensor applications

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Sensor arrays offer opportunities to beam form, and time-frequency analyses offer additional insights to the wavefield data. Data collected while monitoring three different sources with unattended ground sensors in a 16-element, small-aperture (approximately 5 meters) geophone array are used as examples of model-based seismic signal processing on actual geophone array data. The three sources monitored were: (Source 01). A frequency-modulated chirp of an electromechanical shaker mounted on the floor of an underground bunker. Three 60-second time-windows corresponding to (a) 50 Hz to 55 Hz sweep, (b) 60 Hz to 70 Hz sweep, and (c) 80 Hz to 90 Hz sweep. ... continued below

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20 p.; Other: FDE: PDF; PL:

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Followill, F.E.; Wolford, J.K. & Candy, J.V. May 6, 1997.

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Sensor arrays offer opportunities to beam form, and time-frequency analyses offer additional insights to the wavefield data. Data collected while monitoring three different sources with unattended ground sensors in a 16-element, small-aperture (approximately 5 meters) geophone array are used as examples of model-based seismic signal processing on actual geophone array data. The three sources monitored were: (Source 01). A frequency-modulated chirp of an electromechanical shaker mounted on the floor of an underground bunker. Three 60-second time-windows corresponding to (a) 50 Hz to 55 Hz sweep, (b) 60 Hz to 70 Hz sweep, and (c) 80 Hz to 90 Hz sweep. (Source 02). A single transient impact of a hammer striking the floor of the bunker. Twenty seconds of data (with the transient event approximately mid-point in the time window.(Source 11)). The transient event of a diesel generator turning on, including a few seconds before the turn-on time and a few seconds after the generator reaches steady-state conditions. The high-frequency seismic array was positioned at the surface of the ground at a distance of 150 meters (North) of the underground bunker. Four Y-shaped subarrays (each with 2-meter apertures) in a Y-shaped pattern (with a 6-meter aperture) using a total of 16 3-component, high-frequency geophones were deployed. These 48 channels of seismic data were recorded at 6000 and 12000 samples per second on 16-bit data loggers. Representative examples of the data and analyses illustrate the results of this experiment.

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20 p.; Other: FDE: PDF; PL:

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OSTI as DE98054367

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  • Peace and wartime applications and technical issues for unattended ground sensors, Orlando, FL (United States), 21-25 Apr 1997

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  • Other: DE98054367
  • Report No.: UCRL-JC--127576
  • Report No.: CONF-9704125--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 649232
  • Archival Resource Key: ark:/67531/metadc707748

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  • May 6, 1997

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  • Sept. 12, 2015, 6:31 a.m.

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  • Feb. 18, 2016, 11:28 a.m.

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Followill, F.E.; Wolford, J.K. & Candy, J.V. Advanced array techniques for unattended ground sensor applications, article, May 6, 1997; California. (digital.library.unt.edu/ark:/67531/metadc707748/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.