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  • 51. Jakobsson, Andreas
    et al.
    Ekman, T.
    Stoica, P.
    Computationally Efficient 2-D Spectral Estimation2000Conference paper (Refereed)
  • 52. Jakobsson, Andreas
    et al.
    Gini, F.
    Lombardini, F.
    Layover Solution in Multibaseline InSAR Using Robust Beamforming2003Conference paper (Refereed)
  • 53. Jakobsson, Andreas
    et al.
    Gini, F.
    Lombardini, F.
    On the Estimation of Interferometric Phases for Multibaseline SAR Interferometry using a Relaxation-Based Technique2003Conference paper (Refereed)
  • 54. Jakobsson, Andreas
    et al.
    Gini, F.
    Lombardini, F.
    Robust Estimation of Radar Reflectivities in Multibaseline InSAR2005In: IEEE Transactions on Aerospace and Electronic Systems, Vol. 41, No. 2, pp. 81-88, April 2005Article in journal (Refereed)
  • 55. Jakobsson, Andreas
    et al.
    Lombardini, F.
    Gini, F.
    Weighted Subspace Fitting of Interferometric Phases for Multibaseline SAR Interferometry2003Conference paper (Refereed)
  • 56. Jakobsson, Andreas
    et al.
    Marple, Jr., S. L.
    Stoica, P.
    Efficient Implementation of the 2-D Capon Spectral Estimator1999Conference paper (Refereed)
  • 57. Jakobsson, Andreas
    et al.
    Marple, Jr., S. L.
    Stoica, P.
    Two-Dimensional Capon Spectrum Analysis2000In: IEEE Transactions on Signal Processing, Vol. 48, No. 9, pp. 2651-2661, September 2000Article in journal (Refereed)
  • 58. Jakobsson, Andreas
    et al.
    Mossberg, Magnus
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Multi-channel detection of narcotics and explosives using NQR signals2006Conference paper (Refereed)
  • 59.
    Jakobsson, Andreas
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Mossberg, Magnus
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Using Spatial Diversity to Detect Narcotics and Explosives Using NQR Signals2007In: IEEE Transactions on Signal Processing, ISSN 1053-587X, E-ISSN 1941-0476, Vol. 55, no 9, p. 4721-4726Article in journal (Refereed)
    Abstract [en]

    Nuclear quadrupole resonance (NQR) offers an unequivocal method of detecting hidden narcotics and explosives. Unfortunately, the practical use of NQR is restricted by the low signal-to-noise ratio (SNR) and means to improve the SNR are vital to enable a rapid, reliable and convenient system. In this correspondence, we develop two multichannel detectors to counter the typically present radio frequency interference. Numerical simulations indicate that the proposed methods offers a significantly improved robustness to uncertainties in the parameters detailing the examined sample.

  • 60. Jakobsson, Andreas
    et al.
    Mossberg, Magnus
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Rowe, M. D.
    Smith, J. A. S.
    Exploiting temperature dependency in the detection of NQR signals2005Conference paper (Refereed)
  • 61.
    Jakobsson, Andreas
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Mossberg, Magnus
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Rowe, M. D.
    Department of Chemistry, King’s College, London.
    Smith, J. A. S.
    Department of Chemistry, King’s College, London.
    Exploiting temperature dependency in the detection of NQR signals2006In: IEEE Transactions on Signal Processing, ISSN 1053-587X, E-ISSN 1941-0476, Vol. 54, no 5, p. 1610-1616Article in journal (Refereed)
    Abstract [en]

    Nuclear quadrupole resonance (NQR) offers an unequivocal method of detecting and identifying land mines. Unfortunately, the practical use of NQR is restricted by the low signal-to-noise ratio (SNR), and the means to improve the SNR are vital to enable a rapid, reliable, and convenient system. In this paper, an approximate maximum-likelihood detector (AML) is developed, exploiting the temperature dependency of the NQR frequencies as a way to enhance the SNR. Numerical evaluation using both simulated and real NQR data indicate a significant gain in probability of accurate detection as compared with the current state-of-the-art approach.

  • 62.
    Jakobsson, Andreas
    et al.
    Karlstad University, Division for Engineering Sciences, Physics and Mathematics.
    Mossberg, Magnus
    Karlstad University, Division for Engineering Sciences, Physics and Mathematics.
    Rowe, Michael D.
    Smith, John A. S.
    Frequency-Selective Detection of Nuclear Quadrupole Resonance Signals2005In: IEEE Transactions on Geoscience and Remote Sensing, ISSN 0196-2892, E-ISSN 1558-0644, Vol. 43, no 11, p. 2659-2665Article in journal (Refereed)
    Abstract [en]

    Nuclear quadrupole resonance (NQR) offers an unequivocal method of detecting and identifying both hidden explosives, such as land mines, and a variety of narcotics. Unfortunately, the practical use of NQR is restricted by a low signal-to-noise ratio (SNR), and means to improve the SNR are vital to enable a rapid, reliable, and convenient system. In this paper, we introduce a frequency-selective approximate maximum-likelihood (FSAML) detector, operating on a subset of the available frequencies, making it robust to the typically present narrow-band interference. The method exploits the inherent temperature dependency of the NQR frequencies as a way to enhance the SNR. Numerical evaluations, using both simulated and real NQR data, indicate a significant gain in probability of accurate detection as compared to a current state-of-the-art approach.

  • 63. Jakobsson, Andreas
    et al.
    Stoica, P.
    Combining Capon and APES for estimation of spectral lines2000In: Circuits, Systems, and Signal Processing, Vol. 19, No. 2, pp. 159-169, 2000Article in journal (Refereed)
  • 64. Jakobsson, Andreas
    et al.
    Stoica, P.
    On the Forward-Backward Spatial APES2006In: Signal ProcessingArticle in journal (Refereed)
  • 65. Jakobsson, Andreas
    et al.
    Stoica, P.
    Li, J.
    On the Combining of the Capon- and the APES- Spectral Estimators for Estimation of Spectral Lines1999Conference paper (Refereed)
  • 66. Jakobsson, Andreas
    et al.
    Swindlehurst, A. L.
    Stoica, P.
    Resolution of overlapping doppler shifted echoes1998Conference paper (Refereed)
  • 67. Jakobsson, Andreas
    et al.
    Swindlehurst, A. L.
    Stoica, P.
    Subspace-based estimation of time delays and doppler shifts1998In: IEEE Transactions on Signal Processing, Vol. 46, No. 9, pp. 2472-2483, September 1998Article in journal (Refereed)
  • 68. Jakobsson, Andreas
    et al.
    Swindlehurst, A.L.
    A Time Domain Method for Joint Estimation of Time Delays, Doppler Shifts and Spatial Signatures1998Conference paper (Refereed)
  • 69. Jakobsson, Andreas
    et al.
    Swindlehurst, L.
    Astely, D.
    Tidestav, C.
    A Blind Frequency Domain Method for DS-CDMA Synchronization Using Antenna Arrays1998Conference paper (Refereed)
  • 70. Jakobsson, Andreas
    et al.
    Swindlehurst, L.
    Astely, D.
    Tidestav, C.
    On Blind DS-CDMA Synchronization Using An Antenna Array1999Conference paper (Refereed)
  • 71. Li, H.
    et al.
    Stoica, P.
    Li, J.
    Jakobsson, Andreas
    On the performance analysis of matched-filterbank spectral estimators1997Conference paper (Refereed)
  • 72. Ottersten, B.
    et al.
    Stoica, P.
    Astely, D.
    Bengtsson, M
    Jakobsson, Andreas
    Spatio-temporal processing in wireless communications1999Conference paper (Refereed)
  • 73. Somasundaram, S. D.
    et al.
    Jakobsson, Andreas
    Butt, N. R.
    Rowe, M. D.
    Smith, J. A. S.
    Althoefer, K.
    Detection of Stochastic Nuclear Quadrupole Resonance Signals2007Conference paper (Refereed)
  • 74. Somasundaram, S. D.
    et al.
    Jakobsson, Andreas
    Gudmundson, E
    Robust NQR Signal Detection2007Conference paper (Refereed)
  • 75. Somasundaram, S. D.
    et al.
    Jakobsson, Andreas
    Gudmundson, E
    Robust NQR Signal Detection Allowing for Amplitude Uncertainties: to appear2008In: IEEE Transactions on Signal ProcessingArticle in journal (Refereed)
  • 76. Somasundaram, S. D.
    et al.
    Jakobsson, Andreas
    Rowe, M. D.
    Smith, J. A. S.
    Butt, N. R.
    Althoefer, K.
    Detecting Stochastic Nuclear Quadrupole Resonance Signals in the Presence of Strong Radio Frequency Interference2008Conference paper (Refereed)
  • 77. Somasundaram, S. D.
    et al.
    Jakobsson, Andreas
    Smith, J. A. S.
    Analysis of NQR Signals from Mixtures2008In: Signal ProcessingArticle in journal (Refereed)
  • 78. Somasundaram, S. D.
    et al.
    Jakobsson, Andreas
    Smith, J. A. S.
    Frequency Selective Detection of NQR Signals in the Presence of Multiple Polymorphic Forms2006Conference paper (Refereed)
  • 79. Somasundaram, S. D.
    et al.
    Jakobsson, Andreas
    Smith, J. A. S.
    Althoefer, K.
    Detection of Explosives and Narcotics Using Nuclear Quadrupole Resonance2005Report (Refereed)
  • 80. Somasundaram, S. D.
    et al.
    Jakobsson, Andreas
    Smith, J. A. S.
    Althoefer, K.
    Exploiting Spin Echo Decay in the Detection of Nuclear Quadrupole Resonance Signals2007In: IEEE Transactions on Geoscience and Remote SensingArticle in journal (Refereed)
  • 81. Somasundaram, S. D.
    et al.
    Jakobsson, Andreas
    Smith, J. A. S.
    Althoefer, K.
    Frequency Selective Detection of Nuclear Quadrupole Resonance Spin Echoes2006Conference paper (Refereed)
  • 82. Stoica, P.
    et al.
    Jakobsson, Andreas
    Li, J.
    Asymptotic results for cisoid parameter estimation in the colored noise case1997Conference paper (Refereed)
  • 83. Stoica, P.
    et al.
    Jakobsson, Andreas
    Li, J.
    Cisoid parameter estimation in the colored noise case: Asymptotic Cramer-Rao bound, maximum likelihood and nonlinear least-squares1997In: IEEE Transactions on Signal Processing, Vol. 45, pp. 2048-2059, August 1997Article in journal (Refereed)
  • 84. Stoica, P.
    et al.
    Jakobsson, Andreas
    Li, J.
    Matched-filterbank interpretation of some spectral estimators1998In: Signal Processing, Vol. 66, No. 1, pp. 45-59, April 1998Article in journal (Refereed)
  • 85. Stoica, P.
    et al.
    Jakobsson, Andreas
    Li, J.
    Matrix optimization result with applications1996In: Digital Signal Processing, Vol. 6, No. 3, pp. 195-201, July 1996Article in journal (Refereed)
  • 86. Stoica, P.
    et al.
    Jakobsson, Andreas
    Swindlehurst, A. L.
    On multipath identifiability1999In: Signal Processing, Vol. 74, No. 3, pp. 327-330, May 1999Article in journal (Refereed)
  • 87. Zhang, Z.
    et al.
    Jakobsson, Andreas
    Jensen, J. A.
    Chambers, J. A.
    On the Implementation of Adaptive Clutter Filters for Ultrasound Color Flow Imaging2004Conference paper (Refereed)
  • 88. Zhang, Z.
    et al.
    Jakobsson, Andreas
    Macleod, M. D.
    Chambers, J. A.
    On the Efficient Estimation of Blood Velocities2005Conference paper (Refereed)
  • 89. Zhang, Z.
    et al.
    Jakobsson, Andreas
    Macleod, M. D.
    Chambers, J. A.
    On the Efficient Frequency Estimation of a Single Tone2005Conference paper (Refereed)
  • 90. Zhang, Z.
    et al.
    Jakobsson, Andreas
    Macleod, M. D.
    Chambers, J. A.
    Statistically and Computationally Efficient Frequency Estimation of a Single Tone2005Report (Other academic)
  • 91. Zhang, Z.
    et al.
    Jakobsson, Andreas
    Macleod, M.D.
    Chambers, J.A.
    A Hybrid Phase-based Single Frequency Estimator2005In: IEEE Signal Processing LettersArticle in journal (Refereed)
  • 92. Zhang, Z.
    et al.
    Jakobsson, Andreas
    Nikolov, S.
    Chambers, J. A.
    A Novel Velocity Estimator Using Multiple Frequency Components2004Conference paper (Refereed)
  • 93. Zhang, Z.
    et al.
    Jakobsson, Andreas
    Nikolov, S.
    Chambers, J. A.
    Extending the Unambiguous Velocity Range Using Multiple Carrier Frequencies2005In: IEE Electronic LettersArticle in journal (Refereed)
  • 94. Zhang, Z.
    et al.
    Jakobsson, Andreas
    Nikolov, S.
    Chambers, J. A.
    Novel Velocity Estimators Using Multiple Carrier Frequencies2005Report (Refereed)
  • 95. Åhgren, P.
    et al.
    Jakobsson, Andreas
    A Study of Doubletalk Detection Performance in the Presence of Acoustic Echo Path Changes2005Conference paper (Refereed)
  • 96. Åhgren, P.
    et al.
    Jakobsson, Andreas
    Study of Doubletalk Detection Performance in the Presence of Acoustic Echo Path Changes2006In: IEEE Transactions on Consumer ElectronicsArticle in journal (Refereed)
12 51 - 96 of 96
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