Dr. Moayyed Hussain Profile

Dr. Moayyed Hussain

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Publications (8)

Proceedings Article | 18 May 2006 Paper

High frequency sparse array synthesis for target identification signatures

Moayyed Hussain

Proceedings Volume 6234, 62340Y (2006) https://doi.org/10.1117/12.675068

KEYWORDS: Chemical elements, Terahertz radiation, Target recognition, Sensors, Algorithm development, Receivers, Roentgenium, Reflectivity, Dielectrics, Antennas

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Proceedings Article | 19 May 2005 Paper

Stand off detection and classification using terahertz radiation

M. Hussain, M. Johnson, M. Doxbeck

Proceedings Volume 5807, (2005) https://doi.org/10.1117/12.622979

KEYWORDS: Terahertz radiation, Radar, Ranging, Electromagnetic radiation, Pattern recognition, Scattering, Statistical analysis, Synthetic aperture radar, Algorithm development, Data acquisition

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Proceedings Article | 2 November 1999 Paper

Phase-only nulling for transmit antenna

Moayyed Hussain, Kai-Bor Yu

Proceedings Volume 3807, (1999) https://doi.org/10.1117/12.367656

KEYWORDS: Antennas, Chemical elements, Control systems, Radar, Phase shifts, Nulling interferometry, Phased arrays, Signal attenuation, Electromagnetic coupling, Beam shaping

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Proceedings Article | 29 September 1999 Paper

HRR length and velocity decision regions for rapid target identification

Moayyed Hussain

Proceedings Volume 3810, (1999) https://doi.org/10.1117/12.364080

KEYWORDS: Signal to noise ratio, Radar, Target recognition, Scattering, Modulation, Detection and tracking algorithms, Statistical analysis, Missiles, Library classification systems, Velocity measurements

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Proceedings Article | 24 August 1999 Paper

Application of Rayleigh quotients for rapid classification of rotary-wing and fixed-wing targets using high-resolution radar signatures

Moayyed Hussain

Proceedings Volume 3718, (1999) https://doi.org/10.1117/12.359958

KEYWORDS: Target recognition, Radar, Modulation, Automatic target recognition, Scattering, Error analysis, Statistical analysis, Signal to noise ratio, Data modeling, Data storage

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Proceedings Article | 21 June 1999 Paper

Synthesis of two-dimensional wideband ultrasound transducer sparse arrays

Moayyed Hussain, K. Rigby, Ben Noble

Proceedings Volume 3664, (1999) https://doi.org/10.1117/12.350673

KEYWORDS: Chemical elements, Transducers, Ultrasonography, Control systems, Radar, Imaging systems, Signal processing, Phased arrays, Bessel functions, Imaging arrays

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Proceedings Article | 29 January 1999 Paper

Application of sequential transforms for rapid aspect independent target classification using high-resolution radar signatures

Moayyed Hussain

Proceedings Volume 3584, (1999) https://doi.org/10.1117/12.339830

KEYWORDS: Transform theory, Radar, Target recognition, Scattering, Chlorine, Signal to noise ratio, Error analysis, Statistical analysis, Fourier transforms, Data storage

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Modem radar performs target recognition and target imaging tasks, in addition to conventional tasks of detection and tracking. New processing techniques, like stepped frequency wave-forms and RE hardware are now becoming available and will soon result in lower-cost high resolution radar for commercial as well as military applications. Advantage ofwide band operation allows generation of synthetic range with resolution of few centimeters required for target identification. An important class ofwave-forms used for high resolution mapping and target imaging, falls under the category called stretch wave-form processing. The simplest wave-form processing uses Fourier transform (FFT or IFFT). Range profiles thus generated, show the scattering centers of the target, and are being used for one—dimensional target identification procedures. These range profiles, however are very sensitive to target registration due to zero sampling inherent in the FFT procedure. This phenomenon together with the well known aspect sensitivity of the target profiles, plays havoc in the automatic target recognition procedures. In this paper we present a completely new method of obtaining range profiles. These profiles do not sample zeros and are robust with respect to range motion or range registration. Based on the super-resolution techniques, analysis is given for the sequential transform procedures. It is shown that all the peaks of the range profiles are preserved and non of the zeros are sampled. The equivalence of the present procedure to Rayleigh's Quotient is discussed. The procedure is then applied to a large set of signatures obtained using electro-magnetic code using high fidelity facet models. The range profiles were generated with the above mentioned procedures and it was found that even though there is sensitivity with respect to the aspect of the targets, the location of scattering centers remain nearly invariant for the limited aspects of the range profiles. We have designed a high dimension Bayesian classifier for the multi-class problem with empirically obtained threshold levels. The statistical separability of different classes was checked with Bhattachariyya distance for various signal to noise ratios. The dassification produces a confusion matrix and Baye's error that are close to theoretical errors for an acceptable level of signal-to-noise ratio. Results are extremely encouraging and the procedure will be extended as applied to real data.

Proceedings Article | 5 November 1996 Paper

Subarray-based phase-only transmit nulling for jamming and clutter suppression

Kai-Bor Yu, Moayyed Hussain

Proceedings Volume 2845, (1996) https://doi.org/10.1117/12.257245

KEYWORDS: Nulling interferometry, Chemical elements, Phased arrays, Radar, Sodium, Antennas, Phase shifts, Electromagnetic coupling, Control systems, Computing systems

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