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Unnikrishna Pillai

Full Professor Electrical Engineering

1974 …2019
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Research Output 1974 2019

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Conference contribution
2019

Minimum detectable velocity (MDV) for ATI and STAP for high speed platforms

Li, K. Y., Pillai, U. & Mudaliar, S., Apr 2019, 2019 IEEE Radar Conference, RadarConf 2019. Institute of Electrical and Electronics Engineers Inc., 8835591. (2019 IEEE Radar Conference, RadarConf 2019).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

space-time adaptive processing
Space time adaptive processing
platforms
high speed
false alarms
2018

A comparison of receiver concepts for doubly-dispersive random channels

Sgraja, C., Lindner, J. & Pillai, U., Mar 14 2018, 2004 International Waveform Diversity and Design Conference, WDD 2004 - Proceedings. Institute of Electrical and Electronics Engineers Inc., Vol. 2018-January. p. 1-3 3 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Adaptive filters
Sampling
Error analysis
Signal to noise ratio

Energy threshold constraints in transmit waveform design

Pillai, U., Li, K. Y. & Himed, B., Mar 21 2018, 2006 International Waveform Diversity and Design Conference, WDD 2006 - Proceedings. Institute of Electrical and Electronics Engineers Inc., Vol. 2018-January. p. 1-5 5 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Transmitters
waveforms
thresholds
clutter
receivers

Waveform diversity for space based radar

Pillai, U., Himed, B. & Li, K. Y., Mar 14 2018, 2004 International Waveform Diversity and Design Conference, WDD 2004 - Proceedings. Institute of Electrical and Electronics Engineers Inc., Vol. 2018-January. p. 1-5 5 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Target tracking
Bins
Radar
Earth (planet)
Degradation
2016

Exploiting temporal proximity for moving target identification using bistatic/passive SAR

Li, K. Y., Pillai, U. & Himed, B., Jun 3 2016, 2016 IEEE Radar Conference, RadarConf 2016. Institute of Electrical and Electronics Engineers Inc., 7485224

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Frequency modulation
Orthogonal frequency division multiplexing
proximity
Imaging techniques
Synthetic aperture radar

Statistical performance analysis for GMTI using ATI phase distribution

Pillai, U., Li, K. Y., Majumder, U., Minardi, M. J. & Sobota, D., 2016, Algorithms for Synthetic Aperture Radar Imagery XXIII. SPIE, Vol. 9843. 984307

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Interferometry
Synthetic aperture radar
Performance Analysis
Statistical Analysis
Synthetic Aperture
2015

Geolocation of moving targets in Gotcha data using multimode processing

Pillai, U., Li, K. Y. & Scarborough, S. M., 2015, Algorithms for Synthetic Aperture Radar Imagery XXII. SPIE, Vol. 9475. 947508

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Moving Target
Interferometry
Signal processing
Imaging techniques
SAR Image

Moving target geolocation in bistatic/passive SAR images using ATI

Li, K. Y., Pillai, U. & Himed, B., Jun 22 2015, IEEE National Radar Conference - Proceedings. June ed. Institute of Electrical and Electronics Engineers Inc., Vol. 2015-June. p. 45-50 6 p. 7130968

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Orthogonal frequency division multiplexing
Transmitters
Radar

Target geolocation in Gotcha data using panoramic processing

Pillai, U., Li, K. Y. & Scarborough, S., Jun 22 2015, IEEE National Radar Conference - Proceedings. June ed. Institute of Electrical and Electronics Engineers Inc., Vol. 2015-June. p. 21-26 6 p. 7130964

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Signal processing
Processing
Interferometry
Imaging techniques
2014

Distribution of multi-look SAR and ATI using two phase centers

Pillai, U. & Davis, M. E., 2014, 2014 IEEE Radar Conference: From Sensing to Information, RadarCon 2014. Institute of Electrical and Electronics Engineers Inc., p. 22-26 5 p. 6875548

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Interferometry
Testing

Signal decomposition for wind turbine clutter mitigation

Uysal, F., Pillai, U., Selesnick, I. & Himed, B., 2014, 2014 IEEE Radar Conference: From Sensing to Information, RadarCon 2014. Institute of Electrical and Electronics Engineers Inc., p. 60-63 4 p. 6875555

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Wind turbines
Radar
Decomposition
Radar systems
2013

Joint Along Track Interferometry and Space-Time Adaptive Processing for target detection and geolocation

Uysal, F., Murthy, V., Li, K. Y., Pillai, U. & Davis, M. E., 2013, IEEE Radar Conference 2013: "The Arctic - The New Frontier", RadarCon 2013. 6585968

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Space time adaptive processing
Target tracking
Interferometry
Synthetic aperture radar
Radar
2012

Doppler-streak attenuation via oscillatory-plus-transient decomposition of IQ data

Selesnick, I., Li, K. Y., Pillai, U. & Himed, B., 2012, IET International Conference on Radar Systems, Radar 2012. 603 CP ed. Vol. 2012. 1638

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Decomposition
Bins
Processing

Missing data recovery using low rank matrix completion methods

Pillai, U., Murthy, V. & Selesnick, I., 2012, 2012 IEEE Radar Conference: Ubiquitous Radar, RADARCON 2012 - Conference Program. p. 101-106 6 p. 6212119

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Bandwidth
Recovery

Modified space-time adaptive processing for dismount detection using synthetic aperture radar

Li, K. Y., Uysal, F., Pillai, U. & Moore, L. J., 2012, 2012 IEEE Radar Conference: Ubiquitous Radar, RADARCON 2012 - Conference Program. p. 116-121 6 p. 6212122

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Space time adaptive processing
Synthetic aperture radar
Scattering
Sensors
Radar signal processing

Sparsity-based methods for interrupted radar data reconstruction

Storm, K., Murthy, V., Selesnick, I. & Pillai, U., 2012, 2012 IEEE Radar Conference: Ubiquitous Radar, RADARCON 2012 - Conference Program. p. 107-111 5 p. 6212120

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Radar
Synthetic aperture radar
Image processing
History
Imaging techniques

Waveforms for simultaneous SAR and GMTI

Murthy, V., Pillai, U. & Davis, M. E., 2012, 2012 IEEE Radar Conference: Ubiquitous Radar, RADARCON 2012 - Conference Program. p. 51-56 6 p. 6212110

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Synthetic aperture radar
Radar imaging
Image processing
Degradation
2011

Chirp-like transmit waveforms with multiple frequency-notches

Selesnick, I. & Pillai, U., 2011, RadarCon'11 - In the Eye of the Storm: 2011 IEEE Radar Conference. p. 1106-1110 5 p. 5960706

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Radar systems
Frequency bands
Computational complexity
Navigation
Communication

Constant envelope signals with prescribed discrete Fourier transform magnitude

Pillai, S. U., Li, K. Y. & Himed, B., 2011, RadarCon'11 - In the Eye of the Storm: 2011 IEEE Radar Conference. p. 470-473 4 p. 5960582

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Pulse compression
Discrete Fourier transforms
2010

Adaptive transmitter weight design for clutter suppression

Pillai, U., Li, K. Y. & Himed, B., 2010, 2010 2nd International Workshop on Cognitive Information Processing, CIP2010. p. 360-363 4 p. 5604206

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Interference suppression
Transmitters

Angle-Doppler processing using sparse regularization

Selesnick, I., Pillai, U., Li, K. Y. & Himed, B., 2010, 2010 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2010 - Proceedings. p. 2750-2753 4 p. 5496219

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Aircraft radar equipment
Space time adaptive processing
Inverse problems
Processing

An iterative algorithm for the construction of notched chirp signals

Selesnick, I., Pillai, U. & Zheng, R., 2010, 2010 IEEE Radar Conference: Global Innovation in Radar, RADAR 2010 - Proceedings. p. 200-203 4 p. 5494625

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Pulse compression
Radar systems
Navigation systems
Frequency bands
Communication systems

Design of unimodular sequences using generalized receivers

Pillai, S. U., Li, K. Y., Zheng, R. & Himed, B., 2010, 2010 IEEE Radar Conference: Global Innovation in Radar, RADAR 2010 - Proceedings. p. 729-734 6 p. 5494526

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Matched filters
Delta functions
Substitution reactions
2009

Reconstruction of constant envelope signals with given Fourier transform magnitude

Pillai, S. U., Ke, Y. L. & Beyer, H., 2009, 2009 IEEE Radar Conference, RADAR 2009. 4976933

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Signal reconstruction
Fourier transforms
2008

Effect of wind on space-based radar performance

Pillai, U., Li, K. Y. & Himed, B., 2008, 2008 IEEE Radar Conference, RADAR 2008. 4721102

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Target tracking
Autocorrelation
Probability density function
Lakes
Space-based radar

Efficient wideband processing without subbanding

Pillai, U., Li, K. Y. & Guerci, J. R., 2008, 2008 IEEE Radar Conference, RADAR 2008. 4720938

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Target tracking
Processing
Space time adaptive processing
Bessel functions

Theory and application of optimum and adaptive MIMO radar

Guerci, J. R., Wicks, M. C., Bergin, J. S., Techau, P. M. & Pillai, U., 2008, 2008 IEEE Radar Conference, RADAR 2008. 4721122

Research output: Chapter in Book/Report/Conference proceedingConference contribution

MIMO radar
Radar
Matched filters
MIMO systems

Waveform design optimization using bandwidth and energy considerations

Pillai, U., Li, K. Y. & Beyer, H., 2008, 2008 IEEE Radar Conference, RADAR 2008. 4721069

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Transmitters
Bandwidth
Design optimization
2007

A modulation based approach to wideband-STAP

Li, K. Y., Pillai, U., Zulch, P. & Callahan, M., 2007, Conference Record of the 41st Asilomar Conference on Signals, Systems and Computers, ACSSC. p. 1825-1829 5 p. 4487550

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Space time adaptive processing
Modulation
Processing
Radar

Clutter impacts on space based radar GMTI: A global perspective

Li, K. Y., Mangiat, S., Zulch, P. & Pillai, U., 2007, 2007 IEEE Aerospace Conference Digest. 4161481

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Earth (planet)
Launching
Radar
Space-based radar

Effect of bandwidth on wideband-stap performance

Pillai, U., Li, K. Y. & Guerci, J. R., 2007, Conference Record of the 41st Asilomar Conference on Signals, Systems and Computers, ACSSC. p. 2195-2198 4 p. 4487630

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Bandwidth
Processing
Antennas
2006

Cramer-Rao bounds for target doppler and power in space based radar

Pillai, U., Li, K. Y. & Himed, B., 2006, 2006 IEEE Radar Conference. p. 452-458 7 p. 1631839

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Cramer-Rao bounds
White noise
Target tracking
Earth (planet)
Space-based radar

Cramer-Rao bounds for target Doppler and power in space based radar

Pillai, U., Li, K. Y. & Himed, B., 2006, 2006 IEEE Radar Conference. Vol. 2006. p. 452-458 7 p. 1631839

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Cramer-Rao bounds
White noise
Target tracking
Earth (planet)
Space-based radar

Effect of terrain modeling and internal clutter motion on space based radar performance

Mangiat, S., Li, K. Y., Pillai, U. & Himed, B., 2006, 2006 IEEE Radar Conference. p. 310-317 8 p. 1631817

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Radar cross section
Target tracking
Lakes
NASA
Earth (planet)
2005

Effect of Earth's rotation and range foldover on space based radar performance

Pillai, U., Himed, B. & Li, K. Y., 2005, IEEE National Radar Conference - Proceedings. January ed. Institute of Electrical and Electronics Engineers Inc., Vol. 2005-January. p. 137-142 6 p. 1435808

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Earth (planet)
Orbits
Space-based radar
Geometry
Processing

Geometrical Considerations for Terrain Mapping in SBR Applications

Li, K. Y., Mangiat, S., Pillai, U. & Himed, B., May 2005, 2005 IEEE International Radar Conference, Arlington , VA.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Orthogonal pulsing schemes for improved target detection in space based radar

Pillai, U., Himed, B. & Li, K. Y., 2005, Proceedings - 2005 IEEE Aerospace Conference. Vol. 2005. 1559510

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Target tracking
Bins
Radar
Earth (planet)
Degradation
2004

Efficient tapering methods for STAP

Pillai, U., Guerci, J. R. & Pillai, S. R., 2004, Proceedings of the IEEE Radar Conference. p. 408-413 6 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Space time adaptive processing
Covariance matrix
Adaptive algorithms
Target tracking
Processing

Modeling of earth's rotation for space based radar

Pillai, U., Himed, B. & Li, K. Y., 2004, Conference Record - Asilomar Conference on Signals, Systems and Computers. Matthews, M. B. (ed.). Vol. 2. p. 1682-1686 5 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Earth (planet)
Orbits
Geometry
Space-based radar

Multi-channel Waveform Diversity for Improved Target Identification

Pillai, U., Feb 2004, Second Tri-Service Waveform Diversity Workshop, Verona, NY.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Receiver design for rapidly time-varying channels

Sgraja, C., Lindner, J. & Pillai, S. U., 2004, IEEE International Symposium on Information Theory - Proceedings. p. 553 1 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Matched filters
Adaptive filters
Eigenvalues and eigenfunctions
Signal to noise ratio
Sampling
2003

Optimum mimo transmit-receiver design in presence of interference

Pillai, U. & Oh, H. S., 2003, Proceedings - IEEE International Symposium on Circuits and Systems. Vol. 4.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Filter banks
Transceivers
Transmitters

Performance analysis of data sample reduction techniques for STAP

Pillai, U., Guerci, J. R. & Pillai, S. R., 2003, IEEE International Symposium on Phased Array Systems and Technology 2003, Array 2003. Institute of Electrical and Electronics Engineers Inc., Vol. 2003-January. p. 565-570 6 p. 1257043

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Space time adaptive processing
Covariance matrix
Target tracking

Wideband stap (WB-STAP) for passive sonar

Pillai, U., Guerci, J. R. & Pillai, S. R., 2003, Oceans Conference Record (IEEE). Vol. 5.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

sonar
signal processing
field of view
acoustics
radar
2002

Joint optimal TX-RX design for multiple target identification problem

Pillai, S. U., Guerci, J. R. & Radhakrishnan Pillai, S., 2002, 2002 IEEE Sensor Array and Multichannel Signal Processing Workshop Proceedings, SAME 2002. IEEE Computer Society, Vol. 2002-January. p. 553-556 4 p. 1191101

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Radar

Optimized Multichannel Waveforms with Application to Polarimetrics

Pillai, U. & Guerci, J. R., Mar 2002, Proceedings of the Adaptive Sensor Array Processing Workshop, MIT Lincoln Laboratory, Lexington, MA.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Projection approach for STAP

Pillai, U. & Pillai, S. R., 2002, IEEE National Radar Conference - Proceedings. p. 397-402 6 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Space time adaptive processing
Covariance matrix
Target tracking
Data reduction
2001

Optimized Target Detection and Identification using Full-Polarization Radar Waveforms

Garren, D. A., Osborn, M. K., Odom, A. C., Goldstein, J. S., Pillai, U. & Guerci, J. R., Mar 2001, Proceedings of the Adaptive Sensor Array Processing Workshop, MIT Lincoln Laboratory, Lexington, MA.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2000

Adaptive transmission radar: The next `wave'?

Guerci, J. R. & Pillai, U., 2000, National Aerospace and Electronics Conference, Proceedings of the IEEE. Vol. 1. p. 779-786 8 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Additive noise
Transmitters
Radar
Radio interference
Impulse response

Application of the Khatri-Rao Product to Statistical Array Processing

Guerci, J. R. & Pillai, U., Mar 2000, International conference on Statistics: Reflections on the Past and Visions for the Future, San Antonio, TX.

Research output: Chapter in Book/Report/Conference proceedingConference contribution