Prof. Patrick J. Loughlin Profile

Prof. Patrick J. Loughlin

Professor at Univ of Pittsburgh

SPIE Involvement:

Author

Publications (36)

Proceedings Article | 12 May 2016 Paper

Pulse propagation in wavelet phase space

Patrick Loughlin, Leon Cohen

Proceedings Volume 9844, 98440K (2016) https://doi.org/10.1117/12.2223992

KEYWORDS: Wave propagation, Wavelets, Wavelet transforms, Continuous wavelet transforms, Spatial frequencies, Fourier transforms, Physics, Automatic target recognition, Mahalanobis distance, Current controlled current source

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Proceedings Article | 22 May 2015 Paper

Misconceptions about instantaneous frequency, and complex signal representations through pole-zero manipulations

Patrick Loughlin

Proceedings Volume 9476, 947606 (2015) https://doi.org/10.1117/12.2177266

KEYWORDS: Signal analyzers, Fermium, Frequency modulation, Time-frequency analysis, Berkelium, Signal generators, Detection theory, Amplitude modulation, Phase shift keying, Solids

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Proceedings Article | 22 May 2015 Paper

Enhanced target versus clutter discrimination using time-frequency (LTV) filters

Vikram Thiruneermalai Gomatam, Patrick Loughlin

Proceedings Volume 9476, 94760G (2015) https://doi.org/10.1117/12.2177253

KEYWORDS: Signal to noise ratio, Filtering (signal processing), Optical filters, Target recognition, Time-frequency analysis, Target detection, Linear filtering, Automatic target recognition, Electronic filtering, Active remote sensing

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Proceedings Article | 13 June 2014 Paper

Instantaneous frequency and the Wigner-Gabor signal

Patrick Loughlin

Proceedings Volume 9090, 90900F (2014) https://doi.org/10.1117/12.2050766

KEYWORDS: Signal analyzers, Time-frequency analysis, Signal generators, Fourier transforms, FM band, RF communications, Automatic target recognition, Mahalanobis distance, Current controlled current source, Mathematics

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Proceedings Article | 13 June 2014 Paper

Time-frequency filtering for classifying targets in nonstationary clutter

Vikram Thiruneermalai Gomatam, Patrick Loughlin

Proceedings Volume 9090, 90900E (2014) https://doi.org/10.1117/12.2050526

KEYWORDS: Time-frequency analysis, Electronic filtering, Scattering, Backscatter, Optimal filtering, Distance measurement, Optical filters, Sensors, Automatic target recognition, Statistical modeling

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Proceedings Article | 20 May 2013 Paper

Sonar signal feature extraction for target recognition in range-dependent environments

Vikram Gomatam, Patrick Loughlin

Proceedings Volume 8744, 874411 (2013) https://doi.org/10.1117/12.2016157

KEYWORDS: Feature extraction, Signal processing, Signal attenuation, Backscatter, Target recognition, Receivers, Wave propagation, Refractive index, Fourier transforms, Computer engineering

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Proceedings Article | 3 May 2012 Paper

Dispersion-invariant features for classification of objects from their acoustic backscatter in a range-dependent channel

Vikram Gomatam, Patrick Loughlin

Proceedings Volume 8391, 83910D (2012) https://doi.org/10.1117/12.918912

KEYWORDS: Wave propagation, Backscatter, Waveguides, Feature extraction, Dispersion, Acoustics, Numerical simulations, Absorption, Signal attenuation, Computer engineering

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Proceedings Article | 19 May 2011 Paper

Impact of range dependent propagation on classification of underwater objects by their sonar backscatter

Vikram Thiruneermalai Gomatam, Patrick Loughlin

Proceedings Volume 8049, 80490E (2011) https://doi.org/10.1117/12.884160

KEYWORDS: Wave propagation, Dispersion, Backscatter, Waveguides, Absorption, Signal attenuation, Feature extraction, Signal processing, Pollution control, Receivers

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Proceedings Article | 19 May 2011 Paper

Waveform design with time and frequency constraints for optimal detection of elastic objects

Brandon Hamschin, Patrick Loughlin

Proceedings Volume 8049, 80490C (2011) https://doi.org/10.1117/12.884134

KEYWORDS: Signal detection, Target detection, Interference (communication), Receivers, Sensors, Signal processing, Solids, Fourier transforms, Environmental sensing, Electronic filtering

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Proceedings Article | 13 May 2010 Paper

Optimal time and frequency domain waveform design for target detection

Brandon Hamschin, Patrick Loughlin

Proceedings Volume 7696, 76960F (2010) https://doi.org/10.1117/12.850594

KEYWORDS: Target detection, Automatic target recognition, Automatic tracking, Optical tracking, Laser systems engineering, Laser applications, Optical pattern recognition, Mahalanobis distance, Chaos, Current controlled current source

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Proceedings Article | 3 September 2009 Paper

Moment feature variability in uncertain propagation channels

Greg Okopal, Patrick Loughlin

Proceedings Volume 7444, 74440U (2009) https://doi.org/10.1117/12.834176

KEYWORDS: Wave propagation, Automatic target recognition, Target recognition, Backscatter, Active sonar, Signal attenuation, Classification systems, Acoustics, Time-frequency analysis, Distortion

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Proceedings Article | 2 September 2009 Paper

Conditional and joint positive time-frequency distributions: a brief overview

Patrick Loughlin

Proceedings Volume 7444, 74440Y (2009) https://doi.org/10.1117/12.845988

KEYWORDS: Time-frequency analysis, Signal processing, Fourier transforms, Detection theory, Statistical analysis, Picosecond phenomena, Mathematics, Data processing, Current controlled current source, Spectral resolution

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Proceedings Article | 5 May 2009 Paper

Moments of a wave propagating with dispersion and damping

Greg Okopal, Patrick Loughlin

Proceedings Volume 7335, 733507 (2009) https://doi.org/10.1117/12.818993

KEYWORDS: Wave propagation, Time-frequency analysis, Signal attenuation, Automatic target recognition, Fourier transforms, Computer engineering, Classification systems, Mahalanobis distance, Current controlled current source, Spatial frequencies

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Proceedings Article | 25 September 2007 Paper

Construction of time-frequency representations from moments

Leon Cohen, Patrick Loughlin, Keith Davidson

Proceedings Volume 6697, 66970B (2007) https://doi.org/10.1117/12.740191

KEYWORDS: Time-frequency analysis, Fermium, Frequency modulation, Scientific research, Applied physics, Signal processing, Acoustics, Scattering, Fourier transforms

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Proceedings Article | 7 May 2007 Paper

Constructing densities from moments

Leon Cohen, Keith Davidson, Patrick Loughlin

Proceedings Volume 6566, 65660H (2007) https://doi.org/10.1117/12.720651

KEYWORDS: Time-frequency analysis, Fourier transforms, Scientific research, Applied physics, Automatic target recognition, Fermium, Frequency modulation

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Proceedings Article | 7 May 2007 Paper

Feature extraction for classification of signals propagating in channels with dispersion and dissipation

Greg Okopal, Patrick Loughlin

Proceedings Volume 6566, 65660G (2007) https://doi.org/10.1117/12.720074

KEYWORDS: Wave propagation, Signal attenuation, Feature extraction, Radio propagation, Backscatter, Dispersion, Receivers, Radar, Computer simulations, Waveguides

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Proceedings Article | 25 August 2006 Paper

Time-frequency approximations with applications to filtering, modulation, and propagation

Patrick Loughlin

Proceedings Volume 6313, 63130S (2006) https://doi.org/10.1117/12.684023

KEYWORDS: Modulation, Wave propagation, Electronic filtering, Optical filters, Time-frequency analysis, Frequency modulation, Convolution, Fourier transforms, Phase shift keying, Amplitude modulation

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Proceedings Article | 18 May 2006 Paper

Effect of convolution and modulation on the time-varying spectrum of a signal, with application to target recognition

Patrick Loughlin

Proceedings Volume 6234, 62340K (2006) https://doi.org/10.1117/12.668258

KEYWORDS: Convolution, Wave propagation, Modulation, Electronic filtering, Time-frequency analysis, Optical filters, Target recognition, Motion models, Performance modeling, Amplitude modulation

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Proceedings Article | 18 May 2006 Paper

Recognition of propagating vibrations and invariant features for classification

Greg Okopal, Patrick Loughlin, Leon Cohen

Proceedings Volume 6234, 623415 (2006) https://doi.org/10.1117/12.668253

KEYWORDS: Wave propagation, Optical spheres, Backscatter, Dispersion, Fourier transforms, Automatic target recognition, Waveguides, Wave plates, Target recognition, Signal attenuation

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Proceedings Article | 26 October 2004 Paper

Phase-space approach to wave propagation with dispersion and damping

Patrick Loughlin, Leon Cohen

Proceedings Volume 5559, (2004) https://doi.org/10.1117/12.564249

KEYWORDS: Wave propagation, Dispersion, Fourier transforms, Time-frequency analysis, Signal attenuation, Spatial frequencies, Astatine, Partial differential equations, Waveguides, Signal processing

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Proceedings Article | 26 October 2004 Paper

A method to identify and restore a class of aliased signals

Patrick Loughlin, Aasma Walia

Proceedings Volume 5559, (2004) https://doi.org/10.1117/12.564246

KEYWORDS: Time-frequency analysis, Distortion, Signal analyzers, Amplitude modulation, Fourier transforms, Spectrographs, Statistical analysis, Signal generators, Fermium, Frequency modulation

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Proceedings Article | 21 September 2004 Paper

Moment features invariant to dispersion

Patrick Loughlin, Leon Cohen

Proceedings Volume 5426, (2004) https://doi.org/10.1117/12.542424

KEYWORDS: Wave propagation, Fourier transforms, Time-frequency analysis, Dispersion, Bandpass filters, Digital filtering, Radar, Automatic target recognition, Time metrology, Spatial filters

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Proceedings Article | 21 September 2004 Paper

Stationary phase approximation: a modification

Leon Cohen, Patrick Loughlin

Proceedings Volume 5426, (2004) https://doi.org/10.1117/12.542447

KEYWORDS: Wave propagation, Automatic target recognition, Fourier transforms

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Proceedings Article | 24 December 2003 Paper

The marginals and time-frequency distributions

Leon Cohen, Patrick Loughlin

Proceedings Volume 5205, (2003) https://doi.org/10.1117/12.513899

KEYWORDS: Time-frequency analysis, Surface plasmons, Fourier transforms, Signal processing, Fermium, Frequency modulation, Numerical simulations, Physics, Differential equations, Visualization

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Proceedings Article | 6 December 2002 Paper

Local spectral and spatial frequency moments of shallow-water sound propagation

Patrick Loughlin

Proceedings Volume 4791, (2002) https://doi.org/10.1117/12.455784

KEYWORDS: Wave propagation, Dispersion, Waveguides, Spatial frequencies, Time-frequency analysis, Applied physics, Explosives, Distance measurement, Radio propagation, Data modeling

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Proceedings Article | 20 November 2001 Paper

What are the time-frequency moments of a signal?

Patrick Loughlin

Proceedings Volume 4474, (2001) https://doi.org/10.1117/12.448676

KEYWORDS: Time-frequency analysis, Electrical engineering, Biological research, Standards development, Radar, Biomedical optics, Receivers, Transmitters, Signal analysis, Doppler effect

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Proceedings Article | 26 March 2001 Paper

Time-frequency moments, eyelets, and machine faults

Patrick Loughlin

Proceedings Volume 4391, (2001) https://doi.org/10.1117/12.421222

KEYWORDS: Time-frequency analysis, Phase shifts, Platinum, Astatine, Phase shift keying, Fluctuations and noise, Electrical engineering, Signal processing, Amplitude modulation, Feature extraction

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Proceedings Article | 13 November 2000 Paper

Use of instantaneous bandwidth for excising AM-FM jammers in direct-sequence spread-spectrum communication systems

SeongCheol Jang, Patrick Loughlin

Proceedings Volume 4116, (2000) https://doi.org/10.1117/12.406532

KEYWORDS: Linear filtering, Digital filtering, Fermium, Frequency modulation, Signal to noise ratio, Amplitude modulation, Optical correlators, Filtering (signal processing), Modulation, Telecommunications

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Proceedings Article | 2 November 1999 Paper

Instantaneous bandwidth of multicomponent signals

Patrick Loughlin, Keith Davidson

Proceedings Volume 3807, (1999) https://doi.org/10.1117/12.367677

KEYWORDS: Time-frequency analysis, Detection theory, Amplitude modulation, Electrical engineering, Signal analyzers, Signal processing, Signal analysis, Convolution, Distortion, Chromium

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Proceedings Article | 2 November 1999 Paper

Denoising using time-frequency and image processing methods

Douglas Nelson, Gabriel Cristobal, Vitaly Kober, Fehret Cakrak, Patrick Loughlin, Leon Cohen

Proceedings Volume 3807, (1999) https://doi.org/10.1117/12.367673

KEYWORDS: Interference (communication), Electronic filtering, Fourier transforms, Time-frequency analysis, Frequency modulation, Fermium, Transform theory, Signal processing, Optical filters, Filtering (signal processing)

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Proceedings Article | 2 November 1999 Paper

Application of time-frequency methods to sound-quality analysis in automobiles

Mark French, Leon Cohen, Patrick Loughlin

Proceedings Volume 3807, (1999) https://doi.org/10.1117/12.367671

KEYWORDS: Time-frequency analysis, Manufacturing, Signal processing, Fourier transforms, Analytical research, Interference (communication), Assembly tolerances, Roads, Physics, Electrical engineering

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Proceedings Article | 2 October 1998 Paper

Moments and maximum entropy densities in time frequency

Patrick Loughlin

Proceedings Volume 3461, (1998) https://doi.org/10.1117/12.325672

KEYWORDS: Time-frequency analysis, Solids, Electrical engineering, Signal processing, Detection theory, Optical character recognition, Fermium, Frequency modulation, Lithium, Aluminum

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Proceedings Article | 18 September 1998 Paper

Local spectral and temporal characterizations of a wave

Patrick Loughlin

Proceedings Volume 3371, (1998) https://doi.org/10.1117/12.323873

KEYWORDS: Time-frequency analysis, Wave propagation, Acoustics, Frequency modulation, Scattering, Electrical engineering, Doppler effect, Fermium, Absorption, Radar

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Proceedings Article | 24 October 1997 Paper

Time-varying frequencies of a signal

Patrick Loughlin

Proceedings Volume 3162, (1997) https://doi.org/10.1117/12.284182

KEYWORDS: Signal analyzers, Time-frequency analysis, Solids, Phase shift keying, Frequency modulation, Fermium, Detection theory, Modulation, Phase modulation, Quadrature amplitude modulation

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Proceedings Article | 22 October 1996 Paper

Time-frequency-based classification

Berkant Tacer, Patrick Loughlin

Proceedings Volume 2846, (1996) https://doi.org/10.1117/12.255432

KEYWORDS: Time-frequency analysis, Principal component analysis, Biomedical optics, Frequency modulation, Image classification, Distance measurement, Signal processing, Electrical engineering, Fermium, Image processing

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Proceedings Article | 1 December 1991 Paper

Resolution advantages of quadratic signal processing

Les Atlas, Jing Fang, Patrick Loughlin, Wayne Music

Proceedings Volume 1566, (1991) https://doi.org/10.1117/12.49817

KEYWORDS: Sensors, Signal processing, Filtering (signal processing), Linear filtering, Time-frequency analysis, Phase shift keying, Fourier transforms, Bandpass filters, Electronic filtering, Phase shifts

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