Dr. Xiang-Gen Xia Profile

Dr. Xiang-Gen Xia

Professor at Univ of Delaware

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Author

Publications (20)

Proceedings Article | 10 August 2004 Paper

Simple iterative method to exploit the signal space diversity

Yabo Li, Xiang-Gen Xia, Genyuan Wang

Proceedings Volume 5440, (2004) https://doi.org/10.1117/12.562324

KEYWORDS: Iterative methods, Receivers, Demodulation, Matrices, Modulation, Samarium, Optical spheres, Zinc, Forward error correction, Transmitters

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SPIE Journal Paper | 1 January 2003

Adaptive filtering approach to chirp estimation and inverse synthetic aperture radar imaging of maneuvering targets

Genyuan Wang, Xiang-Gen Xia, Victor Chen

OE, Vol. 42, Issue 01, (January 2003) https://doi.org/10.1117/12.10.1117/1.1526842

KEYWORDS: Radar, Digital filtering, Radar imaging, Detection and tracking algorithms, Synthetic aperture radar, Optical filters, Image filtering, Electronic filtering, Fourier transforms, Optical engineering

Proceedings Article | 6 December 2002 Paper

Quasi-orthogonal space-time block codes with full diversity

Weifeng Su, Xiang-Gen Xia

Proceedings Volume 4791, (2002) https://doi.org/10.1117/12.453833

KEYWORDS: Antennas, Signal to noise ratio, Modulation, Receivers, Matrices, Quadrature amplitude modulation, Telecommunications, Silicon, Fourier transforms, Product engineering

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Proceedings Article | 8 March 2002 Paper

Moving-target detection in over-the-horizon radar using adaptive chirplet transform

Genyuan Wang, Xiang-Gen Xia, Benjamin Root, Victor Chen

Proceedings Volume 4738, (2002) https://doi.org/10.1117/12.458736

KEYWORDS: Target detection, Doppler effect, Signal detection, Fourier transforms, Radar, Detection and tracking algorithms, Radar signal processing, Darmstadtium, Signal processing, Electronic filtering

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Proceedings Article | 20 November 2001 Paper

Two generalized complex orthogonal space-time block codes of rates 7/11 and 3/5 for five and six transmit antennas

Weifeng Su, Xiang-Gen Xia

Proceedings Volume 4474, (2001) https://doi.org/10.1117/12.448681

KEYWORDS: Antennas, Quadrature amplitude modulation, Computer engineering, Scientific research, Signal processing, Matrices, Receivers, Signal to noise ratio, Computer programming

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Proceedings Article | 26 March 2001 Paper

Adaptive chirp-Fourier transform for chirp estimation with applications in ISAR imaging of maneuvering targets

Xiang-Gen Xia, Genyuan Wang, Victor Chen

Proceedings Volume 4391, (2001) https://doi.org/10.1117/12.421219

KEYWORDS: Radar imaging, Radar, Lithium, Fourier transforms, Detection and tracking algorithms, Digital filtering, Synthetic aperture radar, Image resolution, Interference (communication), Image filtering

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Proceedings Article | 24 August 2000 Paper

Detection, location, and imaging of fast moving targets using multifrequency antenna array SAR

Genyuan Wang, Xiang-Gen Xia, Victor Chen, Ralph Fiedler

Proceedings Volume 4053, (2000) https://doi.org/10.1117/12.396383

KEYWORDS: Antennas, Synthetic aperture radar, Target detection, Radar, CRTs, Detection and tracking algorithms, Imaging arrays, Fourier transforms, Image resolution, Roads

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Detection, location and SAR imaging of moving targets in clutter have attracted much attention. Locations of moving targets in the SAR image are determined not only by their geometric locations but also by their velocities that cause their SAR images de-focused, smeared, and mis-located in the azimuth dimension. Furthermore, the clutters may cause the detection of moving targets more difficult. Several antenna array based algorithms have been proposed to re-locate the moving targets in the SAR image. With a linear antenna array, the clutters may be suppressed using multiple phase centers. However, there are only two parameters involved in a linear antenna array, i.e., number of receiving antennas and the distance between two adjacent antennas. These two parameters physically limit the capability to detect the accurate locations of fast moving targets and such as vehicles, and only slowly moving targets, such as walking people, can be correctly re-located. In this paper, we propose an antenna array approach where transmitting single wavelength signals are generalized to transmitting multiple wavelength signals (called multi-frequency antenna array SAR). We show that, using multi-frequency antenna array SAR, not only the clutters can be suppressed but also locations of both slow and fast moving targets can be accurately estimated. For example, using two-frequency antenna array SAR system with wavelengths (lambda) ₁ equals 0.03 m and (lambda) ₂ equals 0.05 m, the maximal moving target velocity in the range direction is 1 5 m/s while using single frequency antenna array SAR system with wave length (lambda) ₁ equals 0.03 m or (lambda) ₂ equals 0.05 m, the maximal moving target velocity in the range direction are 3 m/s or 5 m/s, respectively. A robust Chinese Remainder Theorem (CRT) is developed and used for the location of fast and slowly moving targets. Simulations of SAR imaging of ground moving targets are presented to illustrate the effectiveness of the multi-frequency antenna array SAR imaging algorithm.

Proceedings Article | 5 April 2000 Paper

Multiple frequency estimation from undersampled waveforms

Xiang-Gen Xia

Proceedings Volume 4056, (2000) https://doi.org/10.1117/12.381688

KEYWORDS: Nickel, Sodium, CRTs, Antennas, Radon, Magnetic resonance imaging, Analog electronics, Synthetic aperture radar, Target detection, Signal to noise ratio

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Proceedings Article | 2 November 1999 Paper

Iterative direction-of-arrival estimation with wideband chirp signals

Genyuan Wang, Xiang-Gen Xia, Victor Chen

Proceedings Volume 3807, (1999) https://doi.org/10.1117/12.367665

KEYWORDS: Time-frequency analysis, Sensors, Signal processing, Algorithm development, Fourier transforms, Transform theory, Interference (communication), Radar, Coastal modeling, Signal to noise ratio

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Proceedings Article | 26 October 1999 Paper

Some filterbank precoder properties for blind equalization

Xiang-Gen Xia

Proceedings Volume 3813, (1999) https://doi.org/10.1117/12.366790

KEYWORDS: Autoregressive models, Receivers, Antennas, System identification, Matrices, Algorithm development, Modulation, Signal to noise ratio, Optical filters, Transmitters

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Proceedings Article | 29 September 1999 Paper

Multifrequency VSAR imaging of moving targets

Genyuan Wang, Xiang-Gen Xia, Victor Chen

Proceedings Volume 3810, (1999) https://doi.org/10.1117/12.364070

KEYWORDS: Radar, Antennas, Receivers, Synthetic aperture radar, Fourier transforms, Doppler effect, Radar imaging, Target detection, Transmitters, Image resolution

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Proceedings Article | 29 September 1999 Paper

Discrete chirp-Fourier transform

Xiang-Gen Xia

Proceedings Volume 3810, (1999) https://doi.org/10.1117/12.364079

KEYWORDS: Synthetic aperture radar, Signal to noise ratio, Radar, Signal detection, Radar signal processing, Interference (communication), Radar imaging, Analog electronics, Lithium, 3D image processing

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Proceedings Article | 13 August 1999 Paper

Dual-speed SAR imaging of moving targets

Genyuan Wang, Xiang-Gen Xia, Victor Chen

Proceedings Volume 3721, (1999) https://doi.org/10.1117/12.357629

KEYWORDS: Radar, Synthetic aperture radar, Doppler effect, Error analysis, Motion estimation, Target detection, Imaging systems, Radar imaging, Device simulation, Fourier transforms

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Proceedings Article | 24 June 1999 Paper

Block coded modulation for the reduction of the peak-to-average power ratio in OFDM systems

Pingyi Fan, Xiang-Gen Xia

Proceedings Volume 3708, (1999) https://doi.org/10.1117/12.351235

KEYWORDS: Orthogonal frequency division multiplexing, Binary data, Modulation, Computer programming, Data communications, Fluctuations and noise, Fourier transforms, Computer engineering, Computing systems, Telecommunications

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Proceedings Article | 24 June 1999 Paper

Modulated-coded zero-forcing decision feedback equalizer

Xiang-Gen Xia

Proceedings Volume 3708, (1999) https://doi.org/10.1117/12.351227

KEYWORDS: Modulation, Solids, Computer programming, Receivers, Transform theory, Signal to noise ratio, Matrices, Transmitters, Statistical analysis, Telecommunications

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Proceedings Article | 24 June 1999 Paper

New coding scheme for ISI channels: modulated codes

Xiang-Gen Xia, Pingyi Fan, Qian Xie

Proceedings Volume 3708, (1999) https://doi.org/10.1117/12.351226

KEYWORDS: Modulation, Computer programming, Binary data, Transform theory, Forward error correction, Distortion, Device simulation, Receivers, Transmitters, Lead

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Proceedings Article | 22 March 1999 Paper

Synthetic aperture sonar imaging using joint time-frequency analysis

Genyuan Wang, Xiang-Gen Xia

Proceedings Volume 3723, (1999) https://doi.org/10.1117/12.342961

KEYWORDS: Doppler effect, Fourier transforms, Time-frequency analysis, Synthetic aperture radar, Radar, Motion measurement, Error analysis, Detection and tracking algorithms, Radar imaging, Signal analyzers

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Proceedings Article | 14 October 1998 Paper

Signal-to-noise ratio analysis in the joint time-frequency domain for ISAR imaging

Genyuan Wang, Xiang-Gen Xia, Victor Chen

Proceedings Volume 3462, (1998) https://doi.org/10.1117/12.326743

KEYWORDS: Signal to noise ratio, Fourier transforms, Radar, Interference (communication), Time-frequency analysis, Transform theory, Radar imaging, Doppler effect, Signal detection, Signal processing

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Proceedings Article | 26 March 1998 Paper

Doppler ambiguity resolution using optimal multiple pulse repetition frequencies

Xiang-Gen Xia

Proceedings Volume 3391, (1998) https://doi.org/10.1117/12.304863

KEYWORDS: Doppler effect, Niobium, Fourier transforms, Radar, Adaptive optics, Solids, Computer engineering, Numerical simulations, Interference (communication), Fiber optic gyroscopes

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Proceedings Article | 1 July 1993 Paper

Dense all-optical WDM-SCM technology for high-speed computer interconnects

Charles Ih, Rongsheng Tian, H. Zhou, Xiang-Gen Xia

Proceedings Volume 1849, (1993) https://doi.org/10.1117/12.147105

KEYWORDS: Particle filters, Microwave radiation, Wavelength division multiplexing, Signal to noise ratio, Modulation, Frequency modulation, Optical amplifiers, Fermium, Computing systems, Interference (communication)

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Showing 5 of 20 publications

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