James D. Taylor

Bio: James D. Taylor is an academic researcher. The author has contributed to research in topics: Radar & Radar imaging. The author has an hindex of 4, co-authored 6 publications receiving 1004 citations.

Introduction to ultra-wideband radar systems

Abstract: Ultra-Wideband Radar Overview, J.D. Taylor Introduction Ultra-Wideband Radar Terminology and Concepts Potential Applications of UWB Radar UWB Systems Frequency Spectrum Sharing and Interference Issues Book Conclusion References Technical Issues in Ultra-Wideband Radar Systems, H.F. Engler, Jr. Introduction Fundamental Radar Principles Classification of Radar Waveforms Technical Issues in UWB Radar System Design Summary References Appendices: Signal Characteristics Governing Range and Velocity Measurement Resolution Range Accuracy Requirements for Velocity Estimation from Differential Time Delay The Concept of Nonlinearity Analytical Techniques for Ultra-Wideband Signals, M. Rangaswamy and T.K. Sarkar Preface Part 1: Fourier Analysis of Signals Introduction Information and Bandwidth Fourier Analysis of Signals Properties of the Fourier Transform Dirac-Delta Function Fourier Transform of Periodic Signals Numerical Computation of the Fourier Transform Spectral Density Times Correlation of Power Signals Power Spectral Density of Random Signals Conclusion References Part 2: Laplace Transforms and Signal Analysis Introduction Laplace Transforms Inverse Laplace Transform Properties of Laplace Transform One-Sided Laplace Transform Applications of the Two-Sided Laplace Transform Pulse Propagation in a Long Medium Conclusion References Part 3: Limitations of Time and Frequency Approaches Introduction Consideration in Performing Time-Domain Measurements Data Acquisition Processing Considerations Transformations from the Discrete to the Continuous Domain Experimental Verification Characterization of Objects in the Frequency Domain Conclusion References Transmitters Power Supply Design, D. Platts Introduction Considerations for Power Supply Design Pulsed Power Supplies Switching Techniques for Pulsed Power Supplies Conclusion References Light-Activated Semiconductor Switches for UWB Radar, O.S.F. Zucker and I.A. McIntyre Introduction The Evolution of the Requirements Digital Synthesis of UWB Signals by Sequential Switching Digital Synthesis: Experimental Results Switches and Their Limits Switch Optical Requirements Switch Choice Conclusion Acknowledgments References Ultra-Wideband Antenna Technology Introduction and Overview Antennas and UWB Signals, P.R. Foster Introduction Antenna Elements Aperture Antennas References Array Antenna Calculations in the Time Domain Using Pseudorandomly Coded Signals, J.D. Halsey Introduction Impulse Signal Design Correlating Receivers Fundamentals of Beamforming in the Time Domain Numerical Simulation Conclusions References Appendix: A Discussion of Time-Domain Field Equations Ultra-Wideband Impulse Antennas, M.G.M. Hussain Introduction Relative Bandwidth The Large-Current Radiator Field Strengths and Magnetic Flux of the Large-Current Radiator Measured Antenna Patterns References Linear Array Beam Forming with Nonsinusoidal Waves, M.G.M. Hussain Introduction Array Beamforming with Sinusoidal Waves Beamforming with Nonsinusoidal Waves Frequency Domain Array Beamforming Transfer Function and Impulse Response of Linear Array Synthesis of Antenna Array Beam Patterns Summary References Direct Radiating Systems A Basic UWB Design and Experiments: Blumlein Impulse Generator and TEM Radiator, W.C. Nunnally and R.N. Edwards Practical UWB Impulse Generators and Radiators Description of Transverse Electromagnetic Transmitter Basic Impulse Radiation Considerations Experimental Results Conclusions References Design and Analysis of an Example of NEMP Radiating Antenna, D. Giri Introduction Design and Analysis of an Example of NEMP Radiating Antenna Radiating NEMP Simulators Antenna Concepts for UWB Radar Acknowledgments References Propagation and Energy Transfer RF Propagation in the Atmosphere, R. Roussel-Dupre Introduction UWB Propagation Low-Power Propagation through a Background Plasma High-Power Propagation in Nonlinear Media References Energy Transfer through Media and Sensing of the Media, T.W. Barrett Introduction to Energy Transfer Concepts Advanced Theory of Dielectrics and Transmissions through Media Pulse Envelope Effects Soliton Waves, Group Theory, and Electromagnetic Missile Concepts References Appendices: Further Developments in Self-Induced Transparency The Nonlinear Wave Equations and Solitons Relation of U(1) and SU(2) Symmetry Groups Transmitter Signature and Target Signature of Radar Signals, H.F. Harmuth Introduction Features of Carrier-Free Radar Signals Position Coding and Large Target Signature Character Coding and Large Target Signature Conclusions References Appendix: Continuous and Transient Response of Resonant Circuits Radar Cross Section and Target Scattering, M.L. VanBlaricum Introduction Radar Cross Section The Scattering Matrix Frequency Dependence of RCS Relationships among CW, Transient, and Wideband Scattering The Singularity Expansion Formulation Resonance Based Target Identification References Ultra-Wideband Radar Receivers, J.D. Taylor and E.C. Kisenwether Introduction Narrowband and UWB Signal Receiver Concepts UWB Threshold Signal Detection Correlation Detection UWB Radar Receivers and Signal Processing References Appendices: Narrowband Receiver Sensitivity to UWB Signals Computation of Correlator Output vs. SNR High Order Signal Processing for Ultra-Wideband Radar Signals, V.Z. Marmarelis, D. Sheby, E.C. Kisenwether, and T.A. Erdley Introduction Background Methodology Experiment Results Conclusions Acknowledgments References Performance Prediction and Modeling, T.W. Barrett Introduction and Overview Theoretical Background for Time Domain Signal Processing Radar Performance Prediction Principles Comparison Analysis of Frequency Domain and Time Domain Signals Time Domain Radar Performance Prediction Rules for Time Domain Radar Performance Equation Practical Example of a Time Domain Radar System and Analysis References Appendices: Periodic, Aperiodic, and Random Signals The Gaussian Approximation: Heterodyne vs. Homodyne Reception Boundary Diffraction

Ultra-wideband radar technology

Abstract: Preface Main Features of Ultra-Wideband (UWB) Radars and Differences from Common Narrowband Radars, Igor I. Immoreev Improved Signal Detection in UWB Radars, Igor I. Immoreev High-Resolution Ultra-Wideband Radars, Nasser J. Mohamed Ultra-Wideband Radar Receivers, James D. Taylor Compression of Wideband Returns from Overspread Targets, Benjamin C. Flores and Roberto Vasquez, Jr. The Micropower Impulse Radar, James D. Taylor and Thomas E. McEwan Ultra-Wideband Technology for Intelligent Transportation Systems, Robert B. James and Jeffrey B. Mendola Design, Performance, and Applications of a Coherent Ultra-Wideband Random Noise Radar, Ram M. Narayanan, Yi Xu, Paul D. Haffmeyer, and John O. Curtis New Power Semiconductor Devices for Generation of Nano- and Subnanosecond Pulses, Alexei F. Kardo-Sysoev Fourier Series Based Waveform Generation and Signal Processing in Ultra-Wideband Radar, Gurnam S. Gill High Resolution Step-Frequency Radar, Gurnam S. Gill The CARABAS II VHF Synthetic Aperature Radar, Lars Ulander, Hans Hellsten, and James D. Taylor Ultra-Wideband Radar Capability Demonstrations, James D. Taylor Bistatic Radar Polarimetry Theory, Anne-Laure Germond, Eric Pottier, and Joseph Saillard

Ultrawideband Radar: Applications and Design

Abstract: Providing a practical review of the latest technology in the field, Ultrawideband Radar Applications and Design presents cutting-edge advances in theory, design, and practical applications of ultrawideband (UWB) radar. This book features contributions from an international team of experts to help readers learn about a wide range of UWB topics, including: History of the technology American and European governmental regulations and key definitions Nonsinusoidal wave propagation theory Random signal radar Object detection by ground permittivity measurements Large-target backscattering effects Medical applications Large current radiator antenna design Materials-penetrating theory Radar signal processing Weak-signal detection methods Holographic and real time radar imaging This books contributors use practical information to illustrate the latest theoretical developments and demonstrate UWB radar principles through case studies. Radar system engineers will find ideas for precision electronic sensing systems for use in medical, security, industrial, construction, and geophysical applications, as well as those used in archeological, forensic and transportation operations.

Novelda Nanoscale Impulse Radar

Abstract: The Novelda Nanoscale Impulse Radar illustrates some technically advanced principles of ultrawideband (UWB) impulse radar design. Figure 11.1a shows the 5-× 5-mm package for the 2-× 2-mm complementary metal-oxide-semiconductor (CMOS) chip containing all of the essential radar subsystems [1,5]. The chip works with the radar assembly shown in Figure 11.1b, which includes a circuit board with antennas and serial peripheral interface (SPI) connections for digital computer control. The Novelda radar is a general-purpose radar that the user can program and conŽgure for sensing applications at ranges up to 60 m with 4-mm spatial resolution. The system architecture has several unique processing features including the continuous time binary valued (CTBV) design paradigm. You will see the basic principles of the Novelda radar in many of the radars described in this book.

Localization via ultra-wideband radios: a look at positioning aspects for future sensor networks

Abstract: UWB technology provides an excellent means for wireless positioning due to its high resolution capability in the time domain. Its ability to resolve multipath components makes it possible to obtain accurate location estimates without the need for complex estimation algorithms. In this article, theoretical limits for TOA estimation and TOA-based location estimation for UWB systems have been considered. Due to the complexity of the optimal schemes, suboptimal but practical alternatives have been emphasized. Performance limits for hybrid TOA/SS and TDOA/SS schemes have also been considered. Although the fundamental mechanisms for localization, including AOA-, TOA-, TDOA-, and SS-based methods, apply to all radio air interface, some positioning techniques are favored by UWB-based systems using ultrawide bandwidths.

The ultra-wide bandwidth indoor channel: from statistical model to simulations

Abstract: We establish a statistical model for the ultra-wide bandwidth (UWB) indoor channel based on an extensive measurement campaign in a typical modern office building with 2-ns delay resolution. The approach is based on the investigation of the statistical properties of the multipath profiles measured in different rooms over a finely spaced measurement grid. The analysis leads to the formulation of a stochastic tapped-delay-line (STDL) model of the UWB indoor channel. The averaged power delay profile can be well-modeled by a single exponential decay with a statistically distributed decay constant. The small-scale statistics of path energy gains follow Gamma distributions whose parameters m are truncated Gaussian variables with mean values and standard deviations decreasing with delay. The total received energy experiences a lognormal shadowing around the mean energy given by the path-loss power law. We also find that the correlation between multipath components is negligible. Finally, we propose an implementation of the STDL model and give a comparison between the experimental data and the simulation results.

Ultrawideband propagation channels-theory, measurement, and modeling

Abstract: This paper presents an overview of ultrawideband (UWB) propagation channels. It first demonstrates how the frequency selectivity of propagation processes causes fundamental differences between UWB channels and "conventional" (narrowband) channels. The concept of pathloss has to be modified, and the well-known WSSUS model is not applicable anymore. The paper also describes deterministic and stochastic models for UWB channels, identifies the key parameters for the description of delay dispersion, attenuation, and directional characterization, and surveys the typical parameter values that have been measured. Measurement techniques and methods for extracting model parameters are also different in UWB channels; for example, the concepts of narrowband channel parameter estimation (e.g., maximum-likelihood estimation) have to be modified. Finally, channel models also have an important impact on the performance evaluation of various UWB systems.

Recent system applications of short-pulse ultra-wideband (UWB) technology

Abstract: Developed in the early 1960s, time-domain electromagnetics, the study of electromagnetic-wave propagation from a time-domain perspective, has given birth to a fascinating new technology, which today is commonly referred to as ultra-wideband (UWB). It has now been slightly more than 25 years since the 1978 seminal paper of Bennett and Ross, which summarized UWB's early applications. It thus seems appropriate, given the tremendous increase in interest in the technology since the Federal Communications Commission modified its Part 15 rules to accommodate UWB transmissions, to take a look at more recent system applications of this unique technology. This paper provides a brief historical perspective of UWB, discusses recent techniques for the generation and reception of short-pulse electromagnetic waveforms, and examines a number of recently developed UWB systems in the communications, radar, and precision-positioning fields. Finally, a brief assessment of future trends for the technology is provided.

UWB theory and applications

Abstract: Introduction. UWB Channel Models. Modulation Schemes. Receiver Structures. Integrated Circuit Topologies. UWB Antennas. Medium Access Control. Positioning.