Jeffrey L. Krolik

Research Interests

Physics-based and statistical signal processing, sensor array processing, radar and sonar systems, pervasive distributed processing

Bio

Jeffrey Krolik is Professor of Electrical and Computer Engineering at Duke University in Durham, NC. Canadian-born, he received his Ph.D. in Electrical Engineering from the University of Toronto in 1987. He began his academic career as an Assistant Professor of Electrical and Computer Engineering at Concordia University in Montreal. Interested in signal processing applications in the ocean sciences, he joined the Scripps Institution of Oceanography, University of California San Diego as an Assistant Research Scientist in 1990. At Scripps, he developed physics-based sensor array processing methods that exploit multi-path underwater acoustic propagation. Since coming to Duke in 1992, he has broadened his research interests to include statistical signal processing for surveillance radars and microwave remote sensing, active and passive sonar, and medical imaging. Some of his current projects include the development of aircraft height finding for over-the-horizon HF radar, through-the-sensor environmental monitoring of near-surface atmospheric conditions using a shipboard microwave radar, active sonar array shape estimation from reverberation, and functional magnetic resonance imaging algorithms which are robust to head motion. As a consultant, he has worked for the Office of Naval Research, the Defense Advanced Research Projects Agency (DARPA), the Air Force Rome Laboratories.

Education

• B.A. University of Toronto (Canada), 1980
• M.A. University of Toronto (Canada), 1983
• Ph.D. University of Toronto (Canada), 1987

Positions

• Professor of Electrical and Computer Engineering

Courses Taught

• ECE 494: Projects in Electrical and Computer Engineering
• ECE 493: Projects in Electrical and Computer Engineering
• ECE 485: Digital Audio and Acoustic Signal Processing
• ECE 392: Projects in Electrical and Computer Engineering
• ECE 391: Projects in Electrical and Computer Engineering
• ECE 280L: Introduction to Signals and Systems
• ECE 280L9: Signals and Systems - Lab

Publications

• Chen Y, Banerjee S, Daily S, Krolik J, Li H, Limbrick D, et al. Athena – The NSF AI Institute for Edge Computing. AI Magazine. 2024 Mar 1;45(1):15–21.
• Ganti A, Martinez MA, Hickman G, Krolik JL. Wideband Adaptive Beamforming for a Partially-Calibrated Distributed Array. In: 2024 IEEE International Conference on Acoustics, Speech, and Signal Processing Workshops, ICASSPW 2024 - Proceedings. 2024. p. 164–8.
• Mueller E, Martinez M, Richmond C, Krolik J. Sample-Starved Wavefront Adaptive Sensing and GLRT for MTI Radar. In: Proceedings of the IEEE Radar Conference. 2024.
• Ganti A, Martinez M, Hickman G, Krolik J. A wavefront adaptive sensing beamformer for ocean acoustic waveguides. The Journal of the Acoustical Society of America. 2023 Oct;154(4):2398–409.
• Centers J, Krolik J. A Vibrational Radar Backscatter Communication Experimental Testbed. In: Conference Record - Asilomar Conference on Signals, Systems and Computers. 2023. p. 1510–5.
• Martinez MA, Ganti A, Hickman G, Krolik JL. Wavefront Adaptive Sensing Beamformer for Shallow-Water Broadband Interference Mitigation. In: 2023 IEEE 9th International Workshop on Computational Advances in Multi-Sensor Adaptive Processing, CAMSAP 2023. 2023. p. 306–10.
• Centers J, Krolik J. Multi-User Methods for Vibrational Radar Backscatter Communications. In: ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 2023.
• Martinez MA, Krolik JL. A Classification-Aided Recurrent Neural Network for Tracking in Urban Terrain. In: Proceedings of the IEEE Radar Conference. 2022.
• Centers J, Krolik J. Vibrational Radar Backscatter Communication using Resonant Transponding Surfaces. In: Proceedings of the IEEE Sensor Array and Multichannel Signal Processing Workshop. 2022. p. 71–5.
• Ganti A, Krolik J. Sampling Rate Offset Estimation in Acoustic Sensor Networks. In: IEEE Workshop on Statistical Signal Processing Proceedings. 2021. p. 436–40.
• Zhang J, Huang Y, Yang H, Martinez M, Hickman G, Krolik J, et al. Efficient FPGA Implementation of a Convolutional Neural Network for Radar Signal Processing. In: 2021 IEEE 3rd International Conference on Artificial Intelligence Circuits and Systems, AICAS 2021. 2021.
• Centers J, Krolik J. Vibrational Radar Backscatter Communications. In: Conference Record - Asilomar Conference on Signals, Systems and Computers. 2021. p. 1086–90.
• Ganti A, Krolik J. Adaptive Beamforming with a Partially Calibrated Distributed Array. In: Conference Record - Asilomar Conference on Signals, Systems and Computers. 2021. p. 199–203.
• Ganti A, Krolik J. ESPRIT-based Calibration of Multiple Sonobuoys Using a Moving Source. In: 2020 Global Oceans 2020: Singapore - US Gulf Coast. 2020.
• Young AH, Harms HA, Hickman GW, Rogers JS, Krolik JL. Waveguide-Invariant-Based Ranging and Receiver Localization Using Tonal Sources of Opportunity. IEEE Journal of Oceanic Engineering. 2020 Apr 1;45(2):631–44.
• Soli J, Hickman G, Krolik J. Range-Velocity Estimation Bounds for Nonuniform Sonar Comb Signals. IEEE Transactions on Aerospace and Electronic Systems. 2018 Dec 1;54(6):2980–91.
• Cnaan-On I, Harms A, Krolik JL, Calderbank AR. Run-length limited codes for backscatter communication. In: ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 2017. p. 6110–4.
• Ramirez J, Krolik JL. Synthetic aperture processing for passive co-prime linear sensor arrays. Digital Signal Processing: A Review Journal. 2017 Feb 1;61:62–75.
• Xu C, Krolik J. Multiple-input multiple-output radar for monitoring of bed-ridden patients. In: Radar for Indoor Monitoring: Detection, Classification, and Assessment. 2017. p. 227–60.
• Ramirez J, Bottenus N, Trahey G, Krolik JL. Synthetic aperture imaging with thinned linear sensor arrays for medical ultrasound. In: Proceedings of the IEEE Sensor Array and Multichannel Signal Processing Workshop. 2016.
• Xu C, Harms A, Krolik J. MIMO space-delay adaptive processing for wide-area indoor human motion classification. IEEE Transactions on Aerospace and Electronic Systems. 2016 Jun 1;52(3):1384–98.
• Harms A, Odom JL, Krolik JL. Ocean acoustic waveguide invariant parameter estimation using tonal noise sources. In: ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 2015. p. 4001–4.
• Ramirez J, Krolik J. Multiple source localization with moving co-prime arrays. In: ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 2015. p. 2374–8.
• Xu C, Krolik J. Space-delay adaptive processing for MIMO RF indoor motion mapping. In: ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 2015. p. 2349–53.
• Cnaan-On I, Thomas SJ, Krolik JL, Reynolds MS. Multichannel Backscatter Communication and Ranging for Distributed Sensing With an FMCW Radar. IEEE Transactions on Microwave Theory and Techniques. 2015 Jul 1;63(7):2375–83.
• Li L, Krolik JL. CRLB performance for bistatic MIMO radar. In: IEEE National Radar Conference - Proceedings. 2015. p. 1468–72.
• Li L, Krolik JL. Target tracking in uncertain Multipath Environment using distributed Angle-of-Arrival observation. In: IEEE National Radar Conference - Proceedings. 2015. p. 1473–8.
• Odom JL, Krolik JL. Passive Towed Array Shape Estimation Using Heading and Acoustic Data. IEEE Journal of Oceanic Engineering. 2015 Apr 1;40(2):465–74.
• Yu J, Krolik J. MIMO adaptive beamforming for nonseparable multipath clutter mitigation. IEEE Transactions on Aerospace and Electronic Systems. 2014 Oct 1;50(4):2604–18.
• Li L, Krolik JL. Simultaneous target and multipath positioning. IEEE Journal on Selected Topics in Signal Processing. 2014 Feb 1;8(1):153–65.
• Ramirez J, Odom J, Krolik J. Exploiting array motion for augmentation of co-prime arrays. Proceedings of the IEEE Sensor Array and Multichannel Signal Processing Workshop. 2014 Jan 1;525–8.
• Cnaan-On I, Thomas SJ, Reynolds MS, Krolik JL. Multichannel radar backscatter communication and localization. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 2014 Jan 1;76–80.
• Harms A, Hickman G, Papazoglou M, Krolik J. Predicting the array gain of partially coherent planar HF arrays. IEEE National Radar Conference - Proceedings. 2014 Jan 1;1456–9.
• Hickman G, Krolik JL, Kilfoyle DB. Cramer-Rao bounds for HF source geolocation with a vector sensor array. IEEE National Radar Conference - Proceedings. 2014 Jan 1;936–9.
• Xu C, Krolik J. MIMO RF probe for wide-area indoor human motion monitoring. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 2014 Jan 1;6047–51.
• Odom JL, Krolik JL. Adaptive beamforming with augmentable arrays in non-stationary environments. 2013 5th IEEE International Workshop on Computational Advances in Multi-Sensor Adaptive Processing, CAMSAP 2013. 2013 Dec 1;324–7.
• Yu J, Krolik J. Adaptive phase-array calibration using MIMO radar clutter. IEEE National Radar Conference - Proceedings. 2013 Oct 7;
• Odom JL, Krolik J. Heading and hydrophone data fusion for towed array shape estimation. Proceedings of Meetings on Acoustics. 2013 Jun 19;19.
• Li L, Krolik JL. Cramer-Rao performance bounds for simultaneous target and multipath positioning. Conference Record - Asilomar Conference on Signals, Systems and Computers. 2013 Jan 1;2150–4.
• Li L, Krolik JL. Simultaneous Target and Multipath Positioning via multi-hypothesis single-cluster PHD filtering. Conference Record - Asilomar Conference on Signals, Systems and Computers. 2013 Jan 1;461–5.
• Odom JL, Krolik JL, Rogers JS. Maximum-likelihood spatial spectrum estimation in dynamic environments with a short maneuverable array. The Journal of the Acoustical Society of America. 2013 Jan;133(1):311–22.
• Odom JL, Krolik JL. Time-varying array shape estimation by mapping acoustic field directionality. In: OCEANS 2012 MTS/IEEE: Harnessing the Power of the Ocean. 2012.
• Yu J, Krolik J. MIMO multipath clutter mitigation for GMTI automotive radar in urban environments. IET Conference Publications. 2012 Dec 1;2012(603 CP).
• Yu J, Reynolds M, Krolik J. Adaptive baseband interference suppression in multi-channel heterodyne radar receivers. IET Conference Publications. 2012 Dec 1;2012(603 CP).
• Hickman G, Krolik JL. Non-recurrent wideband continuous active sonar. In: OCEANS 2012 MTS/IEEE: Harnessing the Power of the Ocean. 2012.
• Li L, Krolik JL. Simultaneous target and multipath positioning with MIMO radar. IET Conference Publications. 2012 Dec 1;2012(603 CP).
• Odom JL, Krolik JL. Broadband field directionality mapping with spatially-aliased arrays. Proceedings of the IEEE Sensor Array and Multichannel Signal Processing Workshop. 2012 Oct 12;449–52.
• Li L, Krolik JL. Target tracking in uncertain multipath environments using Viterbi data association. Fusion 2011 - 14th International Conference on Information Fusion. 2011 Sep 13;
• Li L, Krolik JL. Vehicular MIMO SAR imaging in multipath environments. IEEE National Radar Conference - Proceedings. 2011 Sep 12;989–94.
• Lee WW, Krolik JL. Space-time adaptive processing for range-folded spread-Doppler radar clutter mitigation. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 2011 Aug 18;2772–5.
• Goldhahn R, Hickman G, Krolik J. A waveguide invariant adaptive matched filter for active sonar target depth classification. The Journal of the Acoustical Society of America. 2011 Apr;129(4):1813–24.
• Hickman G, Krolik JL. MIMO GMTI radar with multipath clutter suppression. 2010 IEEE Sensor Array and Multichannel Signal Processing Workshop, SAM 2010. 2010 Dec 20;65–8.
• Rogers JS, Krolik JL. An online method for time-varying spatial spectrum estimation using a towed acoustic array. Conference Record - Asilomar Conference on Signals, Systems and Computers. 2010 Dec 1;1837–41.
• Yu J, Krolik J. Quadrature slow-time MIMO radar with experimental results. Conference Record - Asilomar Conference on Signals, Systems and Computers. 2010 Dec 1;2134–7.
• Rogers JS, Krolik JL. Time-varying spatial spectrum estimation with a maneuverable towed array. The Journal of the Acoustical Society of America. 2010 Dec;128(6):3543–53.
• Li L, Yu J, Krolik J. Software-defined calibration for FMCW phased-array radar. IEEE National Radar Conference - Proceedings. 2010 Jul 30;877–81.
• Yu J, Reynolds M, Krolik J. An indoor s-band radar receive array testbed. IEEE National Radar Conference - Proceedings. 2010 Jul 30;712–7.
• Yu J, Krolik J. Multiband chirp synthesis for frequency-hopped FMCW radar. Conference Record - Asilomar Conference on Signals, Systems and Computers. 2009 Dec 1;1315–9.
• Hickman G, Krolik JL. MIMO field directionality estimation using orientation-diverse linear arrays. Conference Record - Asilomar Conference on Signals, Systems and Computers. 2009 Dec 1;146–50.
• Mecca VF, Krolik JL. MIMO enabled multipath clutter rank estimation. IEEE National Radar Conference - Proceedings. 2009 Sep 11;
• Ramakrishnan D, Krolik J. Adaptive radar detection in doubly nonstationary autoregressive doppler spread clutter. IEEE Transactions on Aerospace and Electronic Systems. 2009 Jul 20;45(2):484–501.
• Hickman G, Krolik JL. A graph-theoretic approach to constrained floor plan estimation from radar measurements. IEEE Transactions on Signal Processing. 2009 May 25;57(5):1877–88.
• Michaels JE, Hall JS, Hickman G, Krolik J. Sparse array imaging of change-detected ultrasonic signals by minimum variance processing. AIP Conference Proceedings. 2009 May 12;1096:642–9.
• Rogers JS, Krolik JL. Passive broadband source localization in shallow-water multipath acoustic channels. OCEANS 2008. 2008 Dec 1;
• Mecca VF, Krolik JL. MIMO STAP clutter mitigation performance demonstration using acoustic arrays. Conference Record - Asilomar Conference on Signals, Systems and Computers. 2008 Dec 1;634–8.
• Tao H, Hickman G, Krolik J. Field directionality synthesis from multiple array orientations: A least squares approach. OCEANS 2008. 2008 Dec 1;
• Krolik J, Mecca V, Kazanci O, Bilik I. Multipath spread-Doppler clutter mitigation for over-the-horizon radar. 2008 IEEE Radar Conference, RADAR 2008. 2008 Dec 1;
• Goldhahn R, Hickman G, Krolik J. Waveguide invariant broadband target detection and reverberation estimation. The Journal of the Acoustical Society of America. 2008 Nov;124(5):2841–51.
• Bilik I, Kazanci O, Krolik J. Radar clutter mitigation via space-time wavefront adaptive sensing. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 2008 Sep 16;2589–92.
• Mecca VF, Krolik JL, Robey FC. Beamspace slow-time MIMO radar for multipath clutter mitigation. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 2008 Sep 16;2313–6.
• Mecca VF, Krolik JL, Robey FC, Ramakrishnan D. Slow-Time MIMO SpaceTime Adaptive Processing. 2008 Mar 11;283–318.
• Tao H, Krolik JL. Waveguide invariant focusing for broadband beamforming in an oceanic waveguide. The Journal of the Acoustical Society of America. 2008 Mar;123(3):1338–46.
• Kazanci O, Bilik I, Krolik J. Wavefront adaptive raymode processing for over-the-horizon HF radar clutter mitigation. Conference Record - Asilomar Conference on Signals, Systems and Computers. 2007 Dec 1;2191–4.
• Krolik JL, Hickman G. A graph-theoretic approach for constraining floor plan estimation from radar measurements. Conference Record - Asilomar Conference on Signals, Systems and Computers. 2007 Dec 1;2228–34.
• Smith SM, Krolik J, Bilik I. Theoretical passive sonar performance of a cluster of UUV towed line arrays employing orientation diversity. Oceans Conference Record (IEEE). 2007 Dec 1;
• Bilik I, Kazanci O, Krolik J. Wavefront adaptive sensing for radar spread clutter mitigation. 2007 2nd IEEE International Workshop on Computational Advances in Multi-Sensor Adaptive Processing, CAMPSAP. 2007 Dec 1;185–8.
• Mecca VF, Krolik JL. Slow-time MIMO STAP with improved power efficiency. Conference Record - Asilomar Conference on Signals, Systems and Computers. 2007 Dec 1;202–6.
• Tao H, Krolik JL. Waveguide invariant focusing for broadband adaptive beamforming in a shallow water channel. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 2007 Aug 6;2.
• Goldhahn R, Hickman G, Krolik JL. Waveguide invariant reverberation mitigation for active sonar. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 2007 Aug 6;2.
• Liu D, Krolik J, Carin L. Electromagnetic Target Detection in Uncertain Media: Time-Reversal and Minimum-Variance Algorithms. IEEE Transactions on Geoscience and Remote Sensing. 2007 Apr 7;45(4):934–44.
• Liu D, Vasudevan S, Krolik J, Bal G, Carin L. Electromagnetic time-reversal source localization in changing media: Experiment and analysis. IEEE Transactions on Antennas and Propagation. 2007 Feb 1;55(2):344–54.
• Bilik I, Krolik J. Comparative theoretical performance of maneuverable unmanned vehicles versus conventional towed-arrays for passive sonar. OCEANS 2007 - Europe. 2007 Jan 1;
• Tabrikian J, Krolik JL. Barankin bounds for source localization in an uncertain ocean environment. In: Bayesian Bounds for Parameter Estimation and Nonlinear Filtering/Tracking. 2007. p. 529–39.
• Tao H, Hickman G, Krolik JL, Kemp M. Single hydrophone passive localization of transiting acoustic sources. OCEANS 2007 - Europe. 2007 Jan 1;
• Rogers JS, Krolik JL. A study of active sonar reverberation using ultrasonic experiments in a shallow-water tank. OCEANS 2007 - Europe. 2007 Jan 1;
• Tabrikian J, Krolik JL. Efficient computation of the bayesian cramerrao bound on estimating parameters of markov models. In: Bayesian Bounds for Parameter Estimation and Nonlinear Filtering/Tracking. 2007. p. 371–4.
• Kazanci OR, Krolik JL. Single-snapshot beamformer performance using large arrays with faulty sensors. 2006 IEEE Sensor Array and Multichannel Signal Processing Workshop Proceedings, SAM 2006. 2006 Dec 1;6–10.
• Hickman G, Krolik J. Adaptive collaborative array trajectories for optimum passive detection. OCEANS 2006. 2006 Dec 1;
• Ramakrishnan D, Krolik J. Target detection in abruptly non-stationary Doppler-spread clutter. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 2006 Dec 1;3.
• Smith SM, Krolik J. Orientation diversity for an autonomous underwater vehicle cluster. OCEANS 2006. 2006 Dec 1;
• Mecca VF, Ramakrishnan D, Krolik JL. MIMO radar space-time adaptive processing for multipath clutter mitigation. 2006 IEEE Sensor Array and Multichannel Signal Processing Workshop Proceedings, SAM 2006. 2006 Dec 1;249–53.
• Krolik JL, Farrell J, Steinhardt A. Exploiting multipath propagation for GMTI in urban environments. IEEE National Radar Conference - Proceedings. 2006 Dec 1;65–8.
• Krolik JL, Farrell J, Steinhardt A. Exploiting multipath propagation for GMTI in urban environments. CIE International Conference of Radar Proceedings. 2006 Nov 21;2006:65–8.
• Liao R, McKeown MJ, Krolik JL. Isolation and minimization of head motion-induced signal variations in fMRI data using independent component analysis. Magnetic resonance in medicine. 2006 Jun;55(6):1396–413.
• Varadarajan V, Krolik JL. Joint space-time interpolation for distorted linear and bistatic array geometries. IEEE Transactions on Signal Processing. 2006 Mar 1;54(3):848–60.
• Tao H, Krolik J. Robust range-rate estimation of passive narrowband sources in shallow water. Conference Record - Asilomar Conference on Signals, Systems and Computers. 2005 Dec 1;2005:1302–5.
• Liao R, McKeown M, Krolik J. Improved motion correction of fMRI time-series corrupted with major head movement using extended motion-corrected independent component analysis. Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics). 2005 Dec 1;3765 LNCS:346–55.
• Kazanci OR, Krolik JL. Beamspace adaptive channel compensation for sensor arrays with faulty elements. Conference Record - Asilomar Conference on Signals, Systems and Computers. 2005 Dec 1;2005:1316–9.
• Hickman G, Krolik J. Wide-band target depth estimation in a scattering ocean environment. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 2005 Jan 1;IV:1077–80.
• Liu D, Kang G, Li L, Chen Y, Vasudevan S, Joines W, et al. Electromagnetic time-reversal imaging of a target in a cluttered environment. IEEE Transactions on Antennas and Propagation. 2005;53(9):3058–66.
• Liao R, Krolik JL, McKeown MJ. An information-theoretic criterion for intrasubject alignment of FMRI time series: motion corrected independent component analysis. IEEE transactions on medical imaging. 2005 Jan;24(1):29–44.
• Varadarajan V, Krolik J. Target detection using dynamically reconfigurable sensor arrays. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 2005 Jan 1;IV.
• Hickman G, Krolik J. Multipath delay estimation using the magnitude spectrum. IEEE Workshop on Statistical Signal Processing Proceedings. 2005 Jan 1;2005:663–8.
• Varadarajan V, Krolik J. Model-based space-time adaptive processing for active sonar. Conference Record - Asilomar Conference on Signals, Systems and Computers. 2004 Dec 1;2:1431–5.
• Krolik JL, Book P, Kraut S. Adaptive sonar detection performance when the signal wavefront and noise covariance are uncertain. 2004 Sensor Array and Multichannel Signal Processing Workshop. 2004 Dec 1;235–8.
• Liao R, McKeown MJ, Krolik JL. Isolation and minimization of effects of motion on fMRI using multiple reference images. 2004 2nd IEEE International Symposium on Biomedical Imaging: Macro to Nano. 2004 Dec 1;1:916–9.
• Liao R, McKeown MJ, Krolik JL. Motion-corrected independent component analysis for robust functional magnetic resonance imaging. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 2004 Oct 7;2.
• Varadarajan V, Krolik J. Array shape estimation and tracking using active sonar reverberation. IEEE Transactions on Aerospace and Electronic Systems. 2004 Jul 1;40(3):1073–86.
• Hickman G, Krolik JL. Matched-field depth estimation for active sonar. The Journal of the Acoustical Society of America. 2004 Feb;115(2):620–9.
• Kraut S, Anderson RH, Krolik JL. A Generalized Karhunen-Loeve Basis for Efficient Estimation of Tropospheric Refractivity Using Radar Clutter. IEEE Transactions on Signal Processing. 2004 Jan 1;52(1):48–60.
• Varadarajan V, Krolik J. Joint space-time interpolation for bistatic STAP. Conference Record of the Asilomar Conference on Signals, Systems and Computers. 2003 Dec 1;1:60–5.
• Gadwal V, Krolik J. A performance evaluation of autoregressive clutter mitigation methods for over-the-horizon radar. Conference Record of the Asilomar Conference on Signals, Systems and Computers. 2003 Dec 1;1:937–41.
• Kraut S, Krolik J. Passive source localization in the presence of near-endfire interference. Conference Record of the Asilomar Conference on Signals, Systems and Computers. 2003 Dec 1;1:760–4.
• Varadarajan V, Krolik JL. Space-time interpolation for adaptive arrays with limited training data. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 2003 Jan 1;5:353–6.
• Anderson RH, Kraut S, Krolik JL. Robust altitude estimation for over-the-horizon radar using a state-space multipath fading model. IEEE Transactions on Aerospace and Electronic Systems. 2003 Jan 1;39(1):192–201.
• Gerstoft P, Rogers LT, Krolik JL, Hodgkiss WS. Inversion for refractivity parameters from radar sea clutter. Radio Science. 2003;38(3).
• Anderson RH, Krolik JL. Track association for over-the-horizon radar with a statistical ionospheric model. IEEE Transactions on Signal Processing. 2002 Nov 1;50(11):2632–43.
• Tantum SL, Nolte LW, Krolik JL, Harmanci K. The performance of matched-field track-before-detect methods using shallow-water Pacific data. The Journal of the Acoustical Society of America. 2002 Jul;112(1):119–27.
• Pentericci L, Fan X, Rix H-W, Strauss MA, Narayanan VK, Richards GT, et al. VLT optical and near-infrared observations of the z=6.28 quasar SDSS J1030+0524. Astron J (USA). 2002;123(5):2151–8.
• Stoughton C, Lupton RH, Bernardi M, Blanton MR, Burles S, Castander FJ, et al. Sloan Digital Sky Survey: early data release. Astron J (USA). 2002;123(1):485–548.
• Kraut S, Krolik J. Passive localization in range-rate of shallow-water moving targets, by sequential importance sampling. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 2002 Jan 1;3.
• Vasudevan S, Anderson R, Krolik JL. MAP sequence estimation of microwave refractivity from radar clutter via a particle filtering implementation of the viterbi algorithm. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 2002 Jan 1;3.
• Varadarajan V, Krolik JL. Multichannel system identification methods for sensor array calibration in uncertain multipath environments. IEEE Workshop on Statistical Signal Processing Proceedings. 2001 Dec 1;297–300.
• Anderson R, Vasudevan S, Krolik JL, Rogers LT. Maximum A posteriori refractivity estimation from radar clutter using a Markov model for microwave propagation. International Geoscience and Remote Sensing Symposium (IGARSS). 2001 Dec 1;2:906–9.
• Vasudevan S, Krolik JL. Refractivity estimation from radar clutter by sequential importance sampling with a Markov model for microwave propagation. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 2001 Jan 1;5:2905–8.
• Menou K, Vanden Berk DE, Ivezic Z, Kim RSJ, Knapp GR, Richards GT, et al. Broad absorption line quasars in the Sloan Digital Sky Survey with VLA FIRST radio detections. Astrophys J (USA). 2001;561(2):645–52.
• Anderson RH, Kraut S, Krolik JL. Robust altitude estimation for over-the-horizon radar using a state-space model for multipath fading. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 2001 Jan 1;5:2901–4.
• Kraut S, Krolik J. Application of maximal invariance to the ACE detection problem. Conference Record of the Asilomar Conference on Signals, Systems and Computers. 2000 Dec 1;1:417–20.
• Harmanci K, Krolik J. Adaptive temporal processing for equatorial spread Doppler clutter suppression. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 2000 Jan 1;5:3041–4.
• Kraut S, Krolik J. Optimal subspace selection for non-linear parameter estimation applied to refractivity from clutter. IEEE Signal Processing Workshop on Statistical Signal and Array Processing, SSAP. 2000 Jan 1;113–7.
• Edelson R, Koratkar A, Nandra K, Goad M, Peterson BM, Collier S, et al. Intensive HST, RXTE, and ASCA monitoring of NGC 3516: evidence against thermal reprocessing. Astrophys J (USA). 2000;534(1):180–8.
• Krolik JL. Physics-based signal processing in the presence of environmental model uncertainties. In: IEEE 2000 Adaptive Systems for Signal Processing, Communications, and Control Symposium, AS-SPCC 2000. 2000. p. 37–41.
• Harmanci K, Tabrikian J, Krolik JL. Relationships between adaptive minimum variance beamforming and optimal source localization. IEEE Transactions on Signal Processing. 2000 Jan 1;48(1):1–12.
• Rogers LT, Hattan CP, Krolik JL. Using radar sea echo to estimate surface layer refractivity profiles. International Geoscience and Remote Sensing Symposium (IGARSS). 1999 Dec 1;1:658–62.
• Krolik JL, Tabrikian J, Vasudevan S, Rogers LT. Using radar sea clutter to estimate refractivity profiles associated with the capping inversion of the marine atmospheric boundary layer. International Geoscience and Remote Sensing Symposium (IGARSS). 1999 Dec 1;1:649–51.
• Tabrikian J, Krolik JL. Barankin bounds for source localization in an uncertain ocean environment. IEEE Transactions on Signal Processing. 1999 Dec 1;47(11):2917–27.
• Tabrikian J, Krolik JL. Theoretical performance limits on tropospheric refractivity estimation using point-to-point microwave measurements. IEEE Transactions on Antennas and Propagation. 1999 Nov 1;47(11):1727–34.
• Papazoglou M, Krolik JL. Matched-field estimation of aircraft altitude from multiple over-the-horizon radar revisits. IEEE Transactions on Signal Processing. 1999 Apr 1;47(4):966–76.
• Papazoglou M, Krolik JL. ESTIMATION OF AIRCRAFT ALTITUDE AND ALTITUDE RATE WITH OVER-THE-HORIZON RADAR. In: ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 1999. p. 2103–6.
• Tabrikian J, Krolik JL, Vasudevan S. Estimating tropospheric refractivity parameters from radar sea clutter. In: Proceedings of the IEEE Signal Processing Workshop on Higher-Order Statistics, SPW-HOS 1999. 1999. p. 345–8.
• Harmanci K, Krolik J. Matched window processing for mitigating over-the-horizon radar spread Doppler clutter. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 1999 Jan 1;5:2789–92.
• Agol E, Krolik J. Imaging a quasar accretion disk with microlensing. Astrophys J (USA). 1999;524(1):49–64.
• Tabrikian J, Krolik JL. Efficient computation of the Bayesian Cramer-Rao bound on estimating parameters of Markov models. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 1999 Jan 1;3:1761–4.
• Hurt T, Antonucci R, Cohen R, Kinney A, Krolik J. Ultraviolet imaging polarimetry of narrow-line radio galaxies. Astrophys J (USA). 1999;514(2):579–86.
• Anderson R, Krolik J. Multipath track association for over-The-horizon radar using a bootstrapped statistical ionospheric model. Conference Record of the 33rd Asilomar Conference on Signals, Systems, and Computers. 1999 Jan 1;1:8–14.
• Gelenbe E, Harmanci K, Krolik J. Learning neural networks for detection and classification of synchronous recurrent transient signals. Signal Processing. 1998 Feb 26;64(3):233–47.
• Anderson RH, Krolik JL. Over-the-horizon radar target localization using a hidden Markov model estimated from ionosonde data. Radio Science. 1998 Jan 1;33(4):1199–213.
• Anderson RH, Krolik JL. The performance of maximum likelihood over-the-horizon radar coordinate registration. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 1998 Jan 1;4:2481–4.
• Agol E, Krolik J. Photon damping of waves in accretion disks. Astrophys J (USA). 1998;507(1):304–15.
• Papazoglou M, Krolik JL. Multi-dwell matched-field altitude estimation for over-the-horizon radar. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 1998 Jan 1;4:2533–6.
• Krolik JL. Maximum likelihood coordinate registration for over-the-horizon radar. IEEE Transactions on Signal Processing. 1997 Dec 1;45(4):945–59.
• Czenszak SP, Krolik JL. Robust wideband matched-field processing with a short vertical array. Journal of the Acoustical Society of America. 1997 Feb 1;101(2):749–59.
• Heckman TM, Gonzalez Delgado R, Leitherer C, Meurer GR, Krolik J, Wilson AS, et al. A powerful nuclear starburst in the Seyfert galaxy Markarian 477: implications for the starburst-active galactic nucleus connection. Astrophys J (USA). 1997;482(1):114–32.
• Papazoglou M, Krolik JL. Electromagnetic matched-field processing for target height finding with over-the-horizon radar. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 1997 Jan 1;1:559–62.
• Harmanci K, Krolik JL. Robust beamformer weight design for broadband matched-field processing. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 1997 Jan 1;1:471–4.
• Tabrikian J, Krolik JL, Messer H. Robust maximum-likelihood source localization in an uncertain shallow- water waveguide. Journal of the Acoustical Society of America. 1997 Jan 1;101(1):241–9.
• Tabrikian J, Krolik JL. Barankin bound for source localization in shallow water. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 1997 Jan 1;1:499–502.
• Mahadevan R, Narayan R, Krolik J. Gamma-Ray Emission From Advection-Dominated Accretion Flows Around Black Holes: Application to the Galactic Center. Astrophysical Journal. 1997;486(1):268.
• Krolik JL. The Performance of Matched-Field Beanformers with Mediterranean Vertical Array Data. IEEE Transactions on Signal Processing. 1996 Dec 1;44(5):1320.
• Krolik JL. The performance of matched-field beamformers with mediterranean vertical array data. IEEE Transactions on Signal Processing. 1996 Dec 1;44(10):2605–11.
• Krolik JL. Robust matched-field beamforming with benchmark shallow-water acoustic array data. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 1996 Jan 1;2:1185–8.
• Krolik JL, Narasimhan S. Performance bounds on acoustic thermometry of ocean climate in the presence of mesoscale sound-speed variability. Journal of the Acoustical Society of America. 1996 Jan 1;99(1):254–65.
• Papazoglou M, Krolik JL. High resolution adaptive beamforming for three-dimensional acoustic imaging of zooplankton. Journal of the Acoustical Society of America. 1996 Jan 1;100(6):3621–30.
• Tabrikian J, Krolik JL, Messer H. Robust maximum likelihood source localization by exploiting predictable acoustic modes. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 1996 Jan 1;6:3089–91.
• Lasota JP, Abramowicz MA, Chen X, Krolik J. Is the Accretion Flow in NGC 4258 Advection Dominated? Astrophysical Journal. 1996;462(1):142.
• Edelson R, Krolik J, Madejski G, Maraschi L, Pike G, Urry CM, et al. Multiwavelength monitoring of the BL Lacertae object PKS 2155-304. IV. Multiwavelength analysis. Astrophys J (USA). 1995;438(1):120–34.
• Krolik JL, Narasimhan S. Cramer-rao bound on acoustic measurement of ocean climate change in the presence of mesoscale sound-speed variability. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 1995 Jan 1;5:2771–4.
• Narasimhan S, Krolik JL. Fundamental limits on acoustic source range estimation performance in uncertain ocean channels. Journal of the Acoustical Society of America. 1995 Jan 1;97(1):215–26.
• LIU JY, KROLIK JL. THE SPATIAL CORRELATION OF ROUGH SEABED SCATTERING OF SURFACE-GENERATED AMBIENT NOISE (VOL 96, PG 2876, 1994). JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA. 1995;97(5):3198–3198.
• Heckman T, Krolik J, Meurer G, Calzetti D, Kinney A, Koratkar A, et al. The nature of the ultraviolet continuum in type 2 Seyfert galaxies. Astrophys J (USA). 1995;452(2):549–64.
• Jin-Yuan L, Krolik JL. The Spatial Correlation Of Rough Seabed Scattering Of Surface-Generated Ambient Noise. Journal of the Acoustical Society of America. 1994 Jan 1;96(5):2876–86.
• Krolik JL. Sensor array processing performance evaluation via bootstrap resampling. Journal of the Acoustical Society of America. 1994 Jan 1;95(2):798–804.
• Krolik JL, Swingler DN. On the Mean-Square Error Performance of Adaptive Minimum Variance Beamformers Based on the Sample Covariance Matrix. IEEE Transactions on Signal Processing. 1994 Jan 1;42(2):445–8.
• Liu JY, Krolik JL. Spatial correlation of rough seabed scattering of surface-generated ambient noise. Journal of the Acoustical Society of America. 1994;96(5 pt 1):2876.
• Narasimhan S, Krolik JL. A Cramer-Rao bound for source range estimation in a random ocean waveguide. In: IEEE 7th SP Workshop on Statistical Signal and Array Processing, SSAP 1994 - Proceedings. 1994. p. 309–12.
• Pier EA, Antonucci R, Hurt T, Kriss G, Krolik J. The intrinsic nuclear spectrum of NGC 1068. Astrophys J (USA). 1994;428(1):124–9.
• Niezgoda GH, Krolik JL. A Multiple Time Scale Modularized Adaptive Beamformer. IEEE Transactions on Signal Processing. 1994 Jan 1;42(5):1251–6.
• Urry CM, Maraschi L, Edelson R, Koratkar A, Krolik J, Madejski G, et al. Multiwavelength monitoring of the BL Lacertae object PKS 2155-304. I. The IUE campaign. Astrophys J (USA). 1993;411(2):614–31.
• Krolik J, Done C, Madejski G. X-ray light curves of active galactic nuclei are phase incoherent. Astrophys J (USA). 1993;402(2):432–40.
• Niezgoda GH, Krolik JL. A multiple time scale minimum variance beamformer. In: ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 1993. p. 364–7.
• Krolik JL. Matched-field minimum variance beamforming in a random ocean channel. Journal of the Acoustical Society of America. 1992 Oct 14;92(3):1408–19.
• Krolik J, Swingler D. Cross-talk artifacts in spatial spectrum estimation with a sensor array. Journal of the Acoustical Society of America. 1992 Jan 1;92(1):238–43.
• Niezgoda GH, Krolik J. The application of Laguerre partial series expansions for broadband array processing. In: ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 1992. p. 501–4.
• Niezgoda GH, Krolik J, Plotkin E. Broadband source localization in a slowly time-varying environment by multichannel Kalman filtering. IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Conference Proceedings. 1991 Dec 1;787–90.
• Krolik JL, Hodgkiss WS. Matched field source localization in an uncertain environment using constraints based on sound-speed perturbations. Oceans Conference Record (IEEE). 1991 Dec 1;2:771–8.
• Niezgoda GH, Krolik J. The application of adaptive multichannel spectral estimation for broadband array processing. Proceedings - ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing. 1991 Jan 1;2:1397–400.
• Krolik J, Swingler D. The Performance of Minimax Spatial Resampling Filters for Focusing Wide-Band Arrays. IEEE Transactions on Signal Processing. 1991 Jan 1;39(8):1899–903.
• Krolik J, Niezgoda G, Swingler D. A bootstrap approach for evaluating source localization performance on real sensor array data. Proceedings - ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing. 1991 Jan 1;2:1281–4.
• Krolik J, Swingler D. The detection performance of coherent wideband focusing for a spatially resampled array. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 1990 Dec 1;5:2827–30.
• Krolik J, Swingler D. Focused Wide-Band Array Processing by Spatial Resampling. IEEE Transactions on Acoustics, Speech, and Signal Processing. 1990 Jan 1;38(2):356–60.
• Swingler DN, Walker RS, Krolik J. Implementation considerations for a doubly-steered, coherently-focussed high-resolution broadband beamformer for source location estimation. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 1989 Dec 1;4:2589–92.
• Krolik J, Swingler D. Focussed partially adaptive broadband beamforming via spatial resampling. 1989 Dec 1;117–8.
• Krolik J, Lynch J, Swingler D. Robust incoherent matched field processor for source localization in uncertain multipath fields. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 1989 Dec 1;4:2637–40.
• Krolik J, Swingler D. Multiple Broad-Band Source Location Using Steered Covariance Matrices. IEEE Transactions on Acoustics, Speech, and Signal Processing. 1989 Jan 1;37(10):1481–94.
• Swingler DN, Krolik J. Source Location Bias In The Coherently Focused High-Resolution Broadband Beamformer. IEEE Transactions on Acoustics, Speech, and Signal Processing. 1989 Jan 1;37(1):143–5.
• Krolik J, Swingler DN, Walker RS. Dominant-mode steered linear prediction for high resolution broadband source location. 1988 Dec 1;28–32.
• Krolik J, Eizenman M. MINIMUM VARIANCE SPECTRAL ESTIMATION FOR BROADBAND SOURCE LOCATION USING STEERED COVARIANCE MATRICES. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 1988 Jan 1;2841–4.
• Krolik J, Eizenman M, Pasupathy S. Time Delay Estimation of Signals with Uncertain Spectra. IEEE Transactions on Acoustics, Speech, and Signal Processing. 1988 Jan 1;36(12):1801–11.
• Swingler DN, Walker RS, Krolik J. HIGH-RESOLUTION BROADBAND BEAMFORMING USING A DOUBLY-STEERED COHERENT SIGNAL-SUBSPACE APPROACH. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 1988 Jan 1;2658–61.
• Leib H, Eizenman M, Pasupathy S, Krolik J. Adaptive Lattice Filter for Multiple Sinusoids in White Noise. IEEE Transactions on Acoustics, Speech, and Signal Processing. 1987 Jan 1;35(7):1015–23.
• Krolik J, Eizenman M, Pasupathy S. TIME DELAY ESTIMATION VIA GENERALIZED CORRELATION WITH ADAPTIVE SPATIAL PREFILTERING. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 1986 Dec 1;1893–6.
• Krolik J, Eizenman M, Pasupathy S. APPLICATION OF THE LMS ADAPTIVE LINE ENHANCER IN TIME DELAY ESTIMATION. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 1985 Dec 1;1766–9.
• Krolik J, Eizenman M, Pasupathy S. Constrained time delay estimation via zero-crossing methods. Adaptive Methods in Underwater Acoustics Proceedings of the NATO Advanced Study Institute. 1985;207–16.
• Krolik J, Joy M, Pasupathy S, Eizenman M. COMPARATIVE STUDY OF THE LMS ADAPTIVE FILTER VERSUS GENERALIZED CORRELATION METHODS FOR TIME DELAY ESTIMATION. ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings. 1984 Jan 1;1.
• Gonzalez Delgado RM, Heckman T, Leitherer C, Meurer G, Krolik J, Wilson AS, et al. Ultraviolet-optical observations of the Seyfert 2 galaxies NGC 7130, NGC 5135, and IC 3639: implications for the starburst-active galactic nucleus connection. Astrophys J (USA). 505(1):174–98.
• Hero A, Messer H, Goldberg J, Thomson DJ, Amin MG, Giannakis G, et al. Highlights of statistical signal and array processing. IEEE Signal Process Mag (USA). 15(5):21–64.
• Agol E, Krolik J, Turner NJ, Stone JM. Two-dimensional hydrodynamic simulations of convection in radiation-dominated accretion disks. Astrophys J (USA). 558(2):543–52.
• Shorey JA, Nolte LW, Krolik JL. Computationally efficient Monte Carlo estimation algorithms for matched field processing in uncertain ocean environments. J Comput Acoust (Singapore). 2(3):285–314.

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