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Detecting Stochastic Nuclear Quadrupole Resonance Signals in the Presence of Strong Radio Frequency Interference

Somasundaram, Samuel D.; Jakobsson, Andreas LU ; Rowe, Michael D.; Smith, John A. S. and Butt, Naveed LU (2008) IEEE International Conference on Acoustics, Speech, and Signal Processing, 2008 In IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING, VOLS 1-12 p.3645-3648
Abstract
Nuclear quadrupole resonance (NQR) is a radio frequency (RF) spectroscopic technique, allowing the detection of many high explosives and narcotics. In practice, NQR is restricted by the low signal-to-noise ratio of the observed signals, a problem further exacerbated by the presence of strong RF interference (RFI). The current literature focuses on the use of conventional, multiple-pulsed NQR (cNQR) to obtain signals. Here, we investigate an alternative method called stochastic NQR (sNQR), having many advantages over cNQR, one of which is the availability of signal-of-interest free samples. We exploit these samples forming a matched subspace-type detector, able to efficiently reduce the influence of RFI. Further, many of the ideas already... (More)
Nuclear quadrupole resonance (NQR) is a radio frequency (RF) spectroscopic technique, allowing the detection of many high explosives and narcotics. In practice, NQR is restricted by the low signal-to-noise ratio of the observed signals, a problem further exacerbated by the presence of strong RF interference (RFI). The current literature focuses on the use of conventional, multiple-pulsed NQR (cNQR) to obtain signals. Here, we investigate an alternative method called stochastic NQR (sNQR), having many advantages over cNQR, one of which is the availability of signal-of-interest free samples. We exploit these samples forming a matched subspace-type detector, able to efficiently reduce the influence of RFI. Further, many of the ideas already developed for cNQR, including providing robustness to uncertainties in the assumed complex amplitudes and exploiting the temperature dependencies of the NQR spectral components, are recast for sNQR. The presented detector is evaluated on both simulated and measured trinitrotoluene (TNT) data. (Less)
Please use this url to cite or link to this publication:
author
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
detection, estimation, robust methods, nuclear quadrupole resonance (NQR)
in
IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING, VOLS 1-12
pages
3645 - 3648
conference name
IEEE International Conference on Acoustics, Speech, and Signal Processing, 2008
external identifiers
  • Scopus:51449104401
ISSN
1520-6149
ISBN
978-1-4244-1483-3
language
English
LU publication?
no
id
049fcc2e-31c3-41d8-95bc-d76c0da6b0f2 (old id 1232167)
date added to LUP
2008-10-20 16:10:23
date last changed
2016-10-13 04:36:35
@misc{049fcc2e-31c3-41d8-95bc-d76c0da6b0f2,
  abstract     = {Nuclear quadrupole resonance (NQR) is a radio frequency (RF) spectroscopic technique, allowing the detection of many high explosives and narcotics. In practice, NQR is restricted by the low signal-to-noise ratio of the observed signals, a problem further exacerbated by the presence of strong RF interference (RFI). The current literature focuses on the use of conventional, multiple-pulsed NQR (cNQR) to obtain signals. Here, we investigate an alternative method called stochastic NQR (sNQR), having many advantages over cNQR, one of which is the availability of signal-of-interest free samples. We exploit these samples forming a matched subspace-type detector, able to efficiently reduce the influence of RFI. Further, many of the ideas already developed for cNQR, including providing robustness to uncertainties in the assumed complex amplitudes and exploiting the temperature dependencies of the NQR spectral components, are recast for sNQR. The presented detector is evaluated on both simulated and measured trinitrotoluene (TNT) data.},
  author       = {Somasundaram, Samuel D. and Jakobsson, Andreas and Rowe, Michael D. and Smith, John A. S. and Butt, Naveed},
  isbn         = {978-1-4244-1483-3},
  issn         = {1520-6149},
  keyword      = {detection,estimation,robust methods,nuclear quadrupole resonance (NQR)},
  language     = {eng},
  pages        = {3645--3648},
  series       = {IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING, VOLS 1-12},
  title        = {Detecting Stochastic Nuclear Quadrupole Resonance Signals in the Presence of Strong Radio Frequency Interference},
  year         = {2008},
}