Dr. Douglas J. Nelson Profile

Dr. Douglas J. Nelson

Senior Mathematician

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Author

Publications (51)

Proceedings Article | 2 May 2017 Paper

Multi-ball and one-ball geolocation

D. Nelson, J. Townsend

Proceedings Volume 10200, 1020017 (2017) https://doi.org/10.1117/12.2262943

KEYWORDS: Receivers, Artificial intelligence, Signal processing, Fourier transforms, Doppler effect, Error analysis, Correlation function, Automatic tracking, Transmitters, Signal detection

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Proceedings Article | 1 May 2017 Presentation + Paper

Multi-ball and one-ball geolocation and location verification

D. Nelson, J. Townsend

Proceedings Volume 10202, 102020S (2017) https://doi.org/10.1117/12.2271698

KEYWORDS: Artificial intelligence, Demodulation, Signal processing, Fourier transforms, Modulation, Electronic filtering, Correlation function, Automatic tracking, Doppler effect, Radio propagation, Receivers, Electromagnetism, Error analysis

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Proceedings Article | 12 May 2016 Paper

A closed form solution to the one-ball geolocation problem

D. Nelson, J. Townsend

Proceedings Volume 9844, 984410 (2016) https://doi.org/10.1117/12.2223331

KEYWORDS: Receivers, Artificial intelligence, Signal processing, Electronic filtering, Doppler effect, Error analysis, Modulation, Electromagnetism, Detection and tracking algorithms, Global Positioning System

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Proceedings Article | 22 May 2015 Paper

Estimation, tracking and geolocation of maritime burst signals from a single receiver

D. Nelson, J. Townsend

Proceedings Volume 9476, 94760P (2015) https://doi.org/10.1117/12.2175828

KEYWORDS: Receivers, Artificial intelligence, Signal detection, Signal processing, Transmitters, Doppler effect, Demodulation, Frequency shift keying, Interference (communication), Error analysis

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Proceedings Article | 13 June 2014 Paper

Cross-spectral TDOA and FDOA estimation

D. Nelson

Proceedings Volume 9090, 90900H (2014) https://doi.org/10.1117/12.2049497

KEYWORDS: Receivers, Signal processing, Doppler effect, Correlation function, Transmitters, Fourier transforms, Statistical analysis, Heterodyning, Thulium, Motion estimation

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Proceedings Article | 23 May 2013 Paper

A cross-spectral variation of the cross-ambiguity function

D. Nelson

Proceedings Volume 8745, 87451G (2013) https://doi.org/10.1117/12.2015208

KEYWORDS: Receivers, Error analysis, Signal processing, Statistical analysis, Doppler effect, Correlation function, Interference (communication), Fourier transforms, Signal to noise ratio, Interferometers

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Proceedings Article | 3 May 2012 Paper

Locating emitters using a cross-spectral cross-ambiguity function (CSCAF)

D. Nelson

Proceedings Volume 8391, 83910A (2012) https://doi.org/10.1117/12.919603

KEYWORDS: Receivers, Doppler effect, Transmitters, Signal processing, Fourier transforms, Strontium, Statistical analysis, Signal detection, Signal analyzers, Defense and security

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Proceedings Article | 26 May 2011 Paper

Target location from the estimated instantaneous received frequency

D. Nelson, J. McMahon

Proceedings Volume 8020, 80200Q (2011) https://doi.org/10.1117/12.884559

KEYWORDS: Receivers, Doppler effect, Transmitters, Signal processing, Error analysis, Antennas, Mirrors, Radar, Analog electronics, Fermium

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Proceedings Article | 13 May 2010 Paper

Estimation of the continuously varying Doppler effect

D. Nelson, S. Troxell

Proceedings Volume 7696, 76960E (2010) https://doi.org/10.1117/12.850625

KEYWORDS: Doppler effect, Signal processing, Receivers, Radar, Signal to noise ratio, Transmitters, Monte Carlo methods, Motion estimation, Correlation function, Fourier transforms

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Proceedings Article | 3 September 2009 Paper

A comparison of two methods for demodulating a target AIS signal through a collision with an interfering AIS signal

D. Smith, D. Nelson

Proceedings Volume 7444, 74440W (2009) https://doi.org/10.1117/12.825383

KEYWORDS: Artificial intelligence, Amplifiers, Modulation, Demodulation, Phase modulation, Phase shift keying, Electronic filtering, Binary data, Interference (communication), Navigation systems

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Proceedings Article | 3 September 2009 Paper

GMSK co-channel demodulation

D. Nelson, J. Hopkins

Proceedings Volume 7444, 74440V (2009) https://doi.org/10.1117/12.825196

KEYWORDS: Signal processing, Demodulation, Modulation, Phase shift keying, Electronic filtering, Artificial intelligence, Global system for mobile communications, Interference (communication), Fused deposition modeling, Frequency shift keying

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Proceedings Article | 3 September 2008 Paper

A comparison of two methods for joint time-scale and TDOA estimation for geolocation of electromagnetic transmitters

D. Smith, D. Nelson

Proceedings Volume 7074, 707410 (2008) https://doi.org/10.1117/12.793748

KEYWORDS: Electromagnetism, Signal to noise ratio, Error analysis, Receivers, Transmitters, Super resolution, Statistical analysis, Signal processing, Doppler effect, Motion models

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For wide-band transmission, geolocation modeling using the wide-band cross-ambiguity function (WBCAF) is preferable to conventional CAF modeling, which assumes that the transmitted signal is essentially a sinusoid. We compare the accuracy of two super-resolution techniques for joint estimation of the time-scale (TS) and TDOA parameters in the WBCAF geolocation model. Assuming a complex-valued signal representation, both techniques exploit the fact that the maximum value of the magnitude of the WBCAF is attained when the WBCAF is real-valued. The first technique enhances a known joint estimation method based on sinc interpolation and 2-D Newton root-finding by (1) extending the original algorithm to handle complex-valued signals, and (2) reformulating the original algorithm to estimate the difference in radial velocities of the receivers (DV) rather than time scale, which avoids machine precision problems encountered with the original method. The second technique makes a rough estimate of TDOA on the sampling lattice by peak-picking the real part of the cross-correlation function of the received signals. Then, by interpolating the phase of the WBCAF, it obtains a root of the phase in the vicinity of this correlation peak, which provides a highly accurate TDOA estimate. TDOA estimates found in this way are differentiated in time to obtain DV estimates. We evaluate both super-resolution techniques applied to simulated received electromagnetic signals which are linear combinations of complex sinusoids having randomly generated amplitudes, phases, TS, and TDOA. Over a wide SNR range, TDOA estimates found with the enhanced sinc/Newton technique are at least an order of magnitude more accurate than those found with conventional CAF, and the phase interpolated TDOA estimates are 3-4 times more accurate than those found with the enhanced sinc/Newton technique. In the 0-10 dB SNR range, TS estimates found with the enhanced sinc/Newton technique are a little more accurate than those found with phase interpolation. Moreover, the TS estimate errors observed with both super-resolution techniques are too small for a CAF-type grid search to realize in comparable time.

Proceedings Article | 3 September 2008 Paper

Estimating delay and Doppler from a super resolution delay function

D. Nelson

Proceedings Volume 7074, 70740V (2008) https://doi.org/10.1117/12.785252

KEYWORDS: Doppler effect, Receivers, Signal processing, Correlation function, Super resolution, Signal to noise ratio, Error analysis, Electromagnetism, Acoustics, Radar

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Proceedings Article | 21 September 2007 Paper

SCAF estimation of time delay and Doppler stretch

D. Smith, D. Nelson

Proceedings Volume 6697, 669708 (2007) https://doi.org/10.1117/12.740178

KEYWORDS: Radar, Receivers, Doppler effect, Super resolution, Signal processing, Modulation, Fourier transforms, Computer simulations, Transmitters, Stars

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Proceedings Article | 21 September 2007 Paper

High-resolution correlation

D. Nelson

Proceedings Volume 6697, 669709 (2007) https://doi.org/10.1117/12.740182

KEYWORDS: Correlation function, Signal processing, Interference (communication), Signal to noise ratio, Electronic filtering, Statistical analysis, Signal detection, Clocks, Optical filters, Fourier transforms

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Proceedings Article | 21 June 2007 Paper

Time-varying spectral analysis of astronomical time series

Lorenzo Galleani, Leon Cohen, Douglas Nelson, Tomaso Belloni

Proceedings Volume 6603, 660315 (2007) https://doi.org/10.1117/12.728759

KEYWORDS: Astronomy, X-rays, Photonics, Quantum optics, Optical communications, Quantum communications, Electroluminescence, Tin, Fermium, Frequency modulation

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Proceedings Article | 21 June 2007 Paper

Fluctuations in speech

Srinivasan Umesh, Leon Cohen, Douglas Nelson

Proceedings Volume 6602, 66020G (2007) https://doi.org/10.1117/12.726586

KEYWORDS: Californium, Acoustics, Defense and security, Fourier transforms, Biomedical optics, Lead, Solids, Atrial fibrillation

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Proceedings Article | 7 June 2007 Paper

Detection and estimation of multiple weak signals in non-Gaussian noise

D. Nelson

Proceedings Volume 6603, 66030J (2007) https://doi.org/10.1117/12.725029

KEYWORDS: Signal detection, Signal processing, Interference (communication), Signal to noise ratio, Indium nitride, Nonlinear optics, Fourier transforms, Smoothing, Time-frequency analysis, Receivers

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Proceedings Article | 5 September 2006 Paper

Local signal to noise ratio

Lorenzo Galleani, Leon Cohen, Douglas Nelson

Proceedings Volume 6313, 63130Q (2006) https://doi.org/10.1117/12.684026

KEYWORDS: Signal to noise ratio, Interference (communication), Time-frequency analysis, Computer simulations, Signal detection, Stars, Defense and security, Fourier transforms, Numerical simulations, Signal processing

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Proceedings Article | 25 August 2006 Paper

An efficient high-resolution time-frequency representation

D. Nelson, D. Smith

Proceedings Volume 6313, 63130T (2006) https://doi.org/10.1117/12.681438

KEYWORDS: Signal processing, Signal detection, Picosecond phenomena, Signal to noise ratio, Time-frequency analysis, Interference (communication), Fourier transforms, Signal analyzers, Environmental sensing, Data modeling

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Proceedings Article | 17 September 2005 Paper

The speech scale and spectral transformation

Srinivasan Umesh, Leon Cohen, Douglas Nelson

Proceedings Volume 5914, 59140G (2005) https://doi.org/10.1117/12.617609

KEYWORDS: Commercial off the shelf technology, Error analysis, Ear, Transform theory, Mouth, Computer science, Defense and security, Fourier transforms, Mathematical modeling, Wavelets

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Proceedings Article | 16 September 2005 Paper

A higher order method for concentrating the STFT

D. Nelson, D. Smith

Proceedings Volume 5910, 59100G (2005) https://doi.org/10.1117/12.618153

KEYWORDS: Signal processing, Fourier transforms, Fermium, Frequency modulation, Estimation theory, Nonlinear optics, Iterated function systems, Transform theory, Composites, Defense and security

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Proceedings Article | 16 September 2005 Paper

Detection of false transients

Lorenzo Galleani, Leon Cohen, Douglas Nelson

Proceedings Volume 5910, 59100C (2005) https://doi.org/10.1117/12.617662

KEYWORDS: Time-frequency analysis, Interference (communication), Signal to noise ratio, Signal detection, Sensors, Defense and security, Fourier transforms, Signal processing, Detection and tracking algorithms, Stars

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Proceedings Article | 26 October 2004 Paper

Accurate HF carrier estimation

Douglas Nelson, Jeffery Marasovich

Proceedings Volume 5559, (2004) https://doi.org/10.1117/12.560331

KEYWORDS: Signal processing, Error analysis, Fourier transforms, Time-frequency analysis, Receivers, Correlation function, Analytical research, Convolution, Defense and security, Analog electronics

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Proceedings Article | 26 October 2004 Paper

Linear distribution of signals

Douglas Nelson, David Smith, Robert Masenten

Proceedings Volume 5559, (2004) https://doi.org/10.1117/12.560295

KEYWORDS: Signal processing, Fourier transforms, Fermium, Frequency modulation, Signal detection, Nonlinear optics, Composites, Digital filtering, Linear filtering, Defense and security

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Proceedings Article | 24 December 2003 Paper

Spectral correlation based on the cross-spectrum

Douglas Nelson

Proceedings Volume 5205, (2003) https://doi.org/10.1117/12.506602

KEYWORDS: Signal processing, Fourier transforms, Correlation function, Signal analyzers, Databases, Time-frequency analysis, Error analysis, Spectral models, Algorithm development, Modulation

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Proceedings Article | 13 November 2003 Paper

Estimating speaker scale factors from vowels

Douglas Nelson, David Smith, Srinivasan Umesh, Leon Cohen

Proceedings Volume 5207, (2003) https://doi.org/10.1117/12.507416

KEYWORDS: Factor analysis, Databases, Ear, Composites, Defense and security, Fourier transforms, Mendelevium, Defense technologies, Wavelets, Signal processing

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Proceedings Article | 6 December 2002 Paper

Tuning time-frequency methods for the detection of metered HF speech

Douglas Nelson, Lawrence Smith

Proceedings Volume 4791, (2002) https://doi.org/10.1117/12.452027

KEYWORDS: Signal to noise ratio, Signal processing, Signal detection, Optical filters, Time-frequency analysis, Interference (communication), RF communications, Automatic control, Receivers, Electronic filtering

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Proceedings Article | 6 December 2002 Paper

The speech scale, the Mel scale, and the tube model for speech

Srinivasan Umesh, Leon Cohen, Douglas Nelson

Proceedings Volume 4791, (2002) https://doi.org/10.1117/12.456493

KEYWORDS: Commercial off the shelf technology, Fourier transforms, Composites, Ear, Mouth, Defense and security, Signal processing, Acoustics, Laser induced plasma spectroscopy

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Proceedings Article | 6 December 2002 Paper

Multiple-tube resonance model

Lawrence Smith, Douglas Nelson

Proceedings Volume 4791, (2002) https://doi.org/10.1117/12.456494

KEYWORDS: Binary data, Fourier transforms, Defense and security, Analytical research, Resistance, Circuit switching, Systems modeling, Signal processing, Wave propagation, Matrices

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Proceedings Article | 5 December 2001 Paper

Further experimental results on the speech-hearing connection

S. Umesh, Douglas Nelson, Leon Cohen

Proceedings Volume 4478, (2001) https://doi.org/10.1117/12.449700

KEYWORDS: Databases, Composites, Fourier transforms, Defense and security, Physics, Transmitters, Receivers, Associative arrays, Computer programming, Ear

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Proceedings Article | 20 November 2001 Paper

Signal exploitation by time and frequency correlation

Douglas Nelson, Joshua Tempkin

Proceedings Volume 4474, (2001) https://doi.org/10.1117/12.448637

KEYWORDS: CRTs, Fourier transforms, Electronic filtering, Signal processing, Convolution, Correlation function, Fermium, Frequency modulation, Polonium, Databases

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Proceedings Article | 20 November 2001 Paper

Spectral phase algorithm for detecting and estimating pitch

Joshua Tempkin, Douglas Nelson

Proceedings Volume 4474, (2001) https://doi.org/10.1117/12.448687

KEYWORDS: Databases, Detection and tracking algorithms, Fourier transforms, Signal detection, Signal processing, Californium, Data processing, Fermium, Frequency modulation, Statistical analysis

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Proceedings Article | 1 November 2001 Paper

Estimating the instantaneous power spectrum of an x-ray binary system

Lorenzo Galleani, Leon Cohen, Douglas Nelson, Jeffrey Scargle

Proceedings Volume 4477, (2001) https://doi.org/10.1117/12.447165

KEYWORDS: Time-frequency analysis, Signal processing, Electronic filtering, Interference (communication), Optical filters, Filtering (signal processing), X-rays, Binary data, Nonlinear filtering, Linear filtering

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Proceedings Article | 26 March 2001 Paper

Multicomponent FM demodulation of speech based on the short-time Fourier transform (STFT) phase

Douglas Nelson

Proceedings Volume 4391, (2001) https://doi.org/10.1117/12.421230

KEYWORDS: Frequency modulation, Fermium, Fourier transforms, Signal processing, Modulation, Time-frequency analysis, Amplitude modulation, Databases, Transform theory, Demodulation

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Proceedings Article | 28 December 2000 Paper

Estimation of biological signals by time-frequency methods

Douglas Nelson

Proceedings Volume 4115, (2000) https://doi.org/10.1117/12.411546

KEYWORDS: Biological research, Signal processing, Ear, Time-frequency analysis, Fourier transforms, Super resolution, Backscatter, Statistical analysis, Specular reflections, Electronic filtering

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Proceedings Article | 4 December 2000 Paper

High-resolution formant estimation and its application in frequency scaling of speech

Douglas Nelson, S. Umesh, Leon Cohen

Proceedings Volume 4119, (2000) https://doi.org/10.1117/12.408613

KEYWORDS: Fourier transforms, Electronic filtering, Statistical analysis, Error analysis, Defense and security, Physics, Wavelets, Signal processing, Image processing, Factor analysis

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Proceedings Article | 13 November 2000 Paper

Multidimensional/multiresolution Fourier estimation of signals

Douglas Nelson

Proceedings Volume 4116, (2000) https://doi.org/10.1117/12.406486

KEYWORDS: Fourier transforms, Signal detection, Electronic filtering, Signal processing, Digital signal processing, Radar, Statistical analysis, Filtering (signal processing), Multidimensional signal processing, Interference (communication)

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Proceedings Article | 13 October 2000 Paper

Biometric speaker classification

Douglas Nelson, David Smith, D. Richman, Goffrey Townsend

Proceedings Volume 4120, (2000) https://doi.org/10.1117/12.403622

KEYWORDS: Databases, Biometrics, Statistical analysis, Detection and tracking algorithms, Algorithm development, Fourier transforms, Ear, Data processing, Signal processing, Standards development

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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

Cross-spectral methods with an application to speech processing

Douglas Nelson, Wayne Wysocki

Proceedings Volume 3807, (1999) https://doi.org/10.1117/12.367672

KEYWORDS: Modulation, Amplitude modulation, Frequency modulation, Fermium, Phase shift keying, Phase modulation, Ear, Data processing, Fourier transforms, Time-frequency analysis

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Proceedings Article | 26 October 1999 Paper

Scale-transform-based features for application in speech recognition

S. Umesh, Leon Cohen, Douglas Nelson

Proceedings Volume 3813, (1999) https://doi.org/10.1117/12.366828

KEYWORDS: Speech recognition, Fourier transforms, Factor analysis, Signal processing, Chlorine, Defense and security, Wavelets, Image processing, Performance modeling, Ear

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Proceedings Article | 19 October 1998 Paper

Warping functions in speech

S. Umesh, Leon Cohen, Douglas Nelson

Proceedings Volume 3458, (1998) https://doi.org/10.1117/12.328137

KEYWORDS: Fermium, Frequency modulation, Transform theory, Fourier transforms, Receivers, Signal to noise ratio, Ear, Signal analyzers, Filtering (signal processing), Acoustics

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Proceedings Article | 2 October 1998 Paper

Multivariate speech activity dector based on the syllable rate

David Smith, Jeffrey Townsend, Douglas Nelson

Proceedings Volume 3461, (1998) https://doi.org/10.1117/12.325725

KEYWORDS: Detection and tracking algorithms, Sensors, Algorithm development, Signal detection, Interference (communication), Signal to noise ratio, Signal processing, Signal analyzers, Data analysis, Dimension reduction

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Proceedings Article | 2 October 1998 Paper

Invertible time-frequency representations

Douglas Nelson, Owen Kenny

Proceedings Volume 3461, (1998) https://doi.org/10.1117/12.325676

KEYWORDS: Fourier transforms, Fermium, Frequency modulation, Convolution, Time-frequency analysis, Transform theory, Modulation, Electronic filtering, Signal processing, Phase shift keying

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Proceedings Article | 30 October 1997 Paper

Improvements in scale-transform-based features for speech analysis

Srinivasan Umesh, Leon Cohen, Douglas Nelson

Proceedings Volume 3169, (1997) https://doi.org/10.1117/12.292805

KEYWORDS: Acoustics, Databases

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Proceedings Article | 24 October 1997 Paper

Time-frequency methods for enhancing speech

Owen Kenny, Douglas Nelson

Proceedings Volume 3162, (1997) https://doi.org/10.1117/12.284192

KEYWORDS: Signal processing, Interference (communication), Time-frequency analysis, Signal to noise ratio, Image enhancement, Electronic filtering, Image processing, Optical filters, Digital filtering, Finite impulse response filters

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Proceedings Article | 23 October 1996 Paper

Psychoacoustic frequency scales versus frequency warping in scale cepstrum

Srinivasan Umesh, Leon Cohen, Nenad Marinovic, Douglas Nelson

Proceedings Volume 2825, (1996) https://doi.org/10.1117/12.255264

KEYWORDS: Filtering (signal processing), Speech recognition, Ear, Signal processing, Databases, Fourier transforms, Linear filtering, Feature extraction, Detection and tracking algorithms, Optical filters

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Proceedings Article | 1 September 1995 Paper

Scale-invariant speech analysis via joint time-frequency-scale processing

Leon Cohen, Nenad Marinovic, Srinivasan Umesh, Douglas Nelson

Proceedings Volume 2569, (1995) https://doi.org/10.1117/12.217607

KEYWORDS: Fourier transforms, Signal processing, Ear, Modulation, Acoustics, Time-frequency analysis, Signal attenuation, Copper, Signal generators, Defense and security

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Proceedings Article | 7 June 1995 Paper

Pitch-based methods for speech detection and automatic frequency recovery

Douglas Nelson, Joseph Pencak

Proceedings Volume 2563, (1995) https://doi.org/10.1117/12.211428

KEYWORDS: Signal processing, Signal to noise ratio, Detection and tracking algorithms, Modulation, Fermium, Frequency modulation, Signal detection, Algorithm development, Receivers, Amplitude modulation

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Proceedings Article | 7 June 1995 Paper

Classification of digital modulation types

Nenad Marinovic, Douglas Nelson, Leon Cohen, Srinivasan Umesh

Proceedings Volume 2563, (1995) https://doi.org/10.1117/12.211392

KEYWORDS: Modulation, Signal processing, Signal to noise ratio, Phase shift keying, Interference (communication), Fourier transforms, Error analysis, Silicon, Signal detection, Signal analyzers

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Showing 5 of 51 publications

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