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Your search keyword '"Yeste-Ojeda, Omar A."' showing total 40 results
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40 results on '"Yeste-Ojeda, Omar A."'

1. Facet model of moving targets for ISAR imaging and radar back-scattering simulation

Author

Garcia-Fernandez, Angel F., Yeste-Ojeda, Omar A., and Grajal, Jesus

Subjects
Doppler effect -- Analysis, Image processing -- Analysis, Synthetic aperture radar -- Design and construction, Target acquisition -- Methods, Aerospace and defense industries, Business, Computers, Electronics, Electronics and electrical industries
Published
2010

2. Atomic decomposition for radar applications

Author

Yeste-Ojeda, Omar A., Grajal, Jesus, and Lopez-Risueno, Gustavo

Subjects
Algorithms -- Usage, Radar systems -- Design and construction, Radar systems -- Materials, Decomposition (Chemistry) -- Evaluation, Avionics -- Research, Algorithm, Aerospace and defense industries, Business, Computers, Electronics, Electronics and electrical industries
Abstract

In this paper, we explore the promising capabilities of atomic decomposition (AD) for radar-related applications from a practical point of view. Some enhancements and new approaches are proposed herein, and their implementations are fully detailed. We apply the AD algorithms in two different environments, for signal detection where high sensitivity is the main requirement, and for inverse synthetic aperture radar (ISAR) imaging where focused images, target feature extraction, and computational burden are the fundamental concerns.

Published
2008

11. Adaptive-FRESH Filtering

Author

Yeste Ojeda, Omar A.

Subjects
Computers / Speech & Audio Processing
Abstract

Adaptive-FRESH Filtering

Published
2011

24. Low-cost CW-LFM radar sensor at 100 GHz

Author

Mencia Oliva, Beatriz, Grajal de la Fuente, Jesús, Yeste Ojeda, Omar Artemi, Rubio Cidre, Gorka, Badolato, Alejandro, Mencia Oliva, Beatriz, Grajal de la Fuente, Jesús, Yeste Ojeda, Omar Artemi, Rubio Cidre, Gorka, and Badolato, Alejandro

Abstract

This paper presents a W-band high-resolution radar sensor for short-range applications. Low-cost technologies have been properly selected in order to implement a versatile and easily scalable radar system. A large operational bandwidth of 9 GHz, required for obtaining high-range resolution, is attained by means of a frequency multiplication-based architecture. The system characterization to identify the performance-limiting stages and the subsequent design optimization are presented. The assessment of system performance for several representative applications has been carried out.

Published
2013

38. Adaptive-FRESH Filters for Compensation of Cycle-Frequency Errors.

Author

Yeste Ojeda, Omar A. and Grajal, Jesús

Subjects
*ADAPTIVE filters, *CONVERGENCE (Telecommunication), *CYCLOSTATIONARY waves, *LINEAR time invariant systems, *DOPPLER effect
Abstract

This paper deals with the problem of uncertainties in the periodicities of linear almost-periodically time-variant (LAPTV) filters. These filters are usually implemented as a set of branches, each consisting of a frequency shifter followed by a linear time-invariant (LTI) filter. This implementation is also known as FRESH filters. This paper is motivated by the fact that, when there exist errors in the frequency shifts, the optimum set of LTI filters is obtained by canceling the outputs of the corresponding branches. The purpose of this paper is to analyze the nonstationary behavior of adaptive filters in order to mitigate this problem. Our results show that an adaptive filter can offset the errors in the frequency shifts. The reason is that the coefficients of the adaptive filter are updated so that the filter actually performs as' a linear periodically time-variant filter for each branch. This allows to track the errors in the frequency shifts when the rate of convergence of the adaptive algorithm is suitably selected. An analytical study of the convergence is presented, which allows to compute the optimal rate of convergence and the mean squared-error attained by the adaptive filter. [ABSTRACT FROM AUTHOR]

Published
2010
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