Results 171 to 180 of about 14,928 (214)

Randomized stepped frequency ISAR imaging

2012 IEEE Radar Conference, 2012
Linearly stepped frequency (LSF) waveforms are widely equipped in inverse synthetic aperture radar (ISAR), where the frequency is linearly altered with a fixed frequency step in each burst. ISAR employing randomized stepped frequency (RSF) modulation improves the rang-Doppler resolution, widens the unambiguous Doppler window, and enhances performance ...
null Tianyao Huang, null Yimin Liu, null Gang Li, null Xiqin Wang   +3 more
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Introduction to ISAR Imaging

2014
The aim of this introductory chapter is to cover some fundamental concepts on ISAR and to highlight some characteristics that make these systems unique, especially related to SAR. Although SAR and ISAR share the same underlining concept of forming a synthetic aperture, they are substantially different in the way they process the radar received signal ...
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Target angular motion effects on ISAR imaging

IEE Proceedings - Radar, Sonar and Navigation, 1997
The authors investigate the effects of target roll, pitch and yaw motions in ISAR image reconstruction. They determine the impulse response of an imaging system in the presence of angular motions and evaluate the conditions under which pitch, roll and yaw have negligible effect on image focus. The theoretical analysis is finally validated by presenting
BERIZZI, FABRIZIO, DIANI, MARCO
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ISAR Imaging with LFM waveforms

2007 1st Asian and Pacific Conference on Synthetic Aperture Radar, 2007
This thesis demonstrates a technique involving Linear Frequency Modulation (LFM) waveform and Inverse Synthetic Aperture Radar (ISAR) processing to develop two-dimensional radar images of a missile target. The processing is combination of two high-resolution processes: development of a high-range resolution (HRR) profile in down range using LFM ...
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Translational motion compensation in ISAR image processing

IEEE Transactions on Image Processing, 1995
In inverse synthetic aperture radar (ISAR) imaging, the target rotational motion with respect to the radar line of sight contributes to the imaging ability, whereas the translational motion must be compensated out. This paper presents a novel two-step approach to translational motion compensation using an adaptive range tracking method for range bin ...
H, Wu, D, Grenier, G Y, Delisle, D G, Fang   +3 more
openaire   +2 more sources

Iterative Optimization-Based ISAR Imaging With Sparse Aperture and Its Application in Interferometric ISAR Imaging

IEEE Sensors Journal, 2019
Recently, high-resolution inverse synthetic aperture radar (ISAR) imaging with sparse aperture (SA) data has attracted increasing attention. The theory of compressive sensing (CS) suggests that an unknown sparse signal can be accurately recovered by taking advantage of very limited samples.
Jiajia Rong, Yong Wang, Tao Han
openaire   +1 more source

Sample fitting in ISAR imaging

Proceedings of IEEE Antennas and Propagation Society International Symposium and URSI National Radio Science Meeting, 2002
This paper investigates the effect of sample fitting on ISAR image quality. Usually motion compensation consists of two stages. The first stage is aimed at removing the gross radial motion (i.e. range cell alignment). The second stage attempts to remove the residual phase variations not corrected in the first stage because of noise and other jamming ...
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Time windowing for highly focused ISAR image reconstruction

IEEE Transactions on Aerospace and Electronic Systems, 2005
In several applications long recorded live inverse synthetic aperture radar (ISAR) data are used to obtain one or more ISAR images. In order to reconstruct a well-focused ISAR image, a suitable selection of the echoes to be coherently processed must be provided. Such a selection can be made by defining a time window.
BERIZZI, FABRIZIO, MARTORELLA, MARCO
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An information divergence measure for ISAR image registration

Proceedings of the 11th IEEE Signal Processing Workshop on Statistical Signal Processing (Cat. No.01TH8563), 2001
Entropy-based divergence measures have shown promising results in many areas of engineering and image processing. A generalized information-theoretic measure called Jensen-Renyi divergence is proposed. Some properties such as convexity and its upper bound are derived.
Yun He, A. Ben Hamza, A. Hamid Krim
openaire   +1 more source

Precision tracking algorithms for ISAR imaging

IEEE Transactions on Aerospace and Electronic Systems, 1996
The simultaneous imaging and tracking of a moving target is one of the most difficult problems in inverse synthetic aperture radar (ISAR) signal processing. The problem is addressed here using a two-antenna imaging radar. The target range shift is sensed with an exponentially averaged envelope correlation algorithm while the angle change is measured ...
null Haiqing Wu, G.Y. Delisle
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