Results 141 to 150 of about 6,280 (175)

Methods for the rotation of ISAR images

2009 2nd Asian-Pacific Conference on Synthetic Aperture Radar, 2009
Image rotation plays an important role in image understanding. The rotation of inverse synthetic aperture radar images can be done either in the image forming process or after. Also, when the image is rotated in the imaging forming process, it can be performed both in the time-domain and the frequency-domain. This paper introduces three methods for the
Zhong-hai Zhou, Bin Zhou, Chun-mao Yeh
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SAR, ISAR and hybrid SAR/ISAR-a unified treatment of radar imaging

The Record of the 1993 IEEE National Radar Conference, 2002
The modeling of aperture synthesis as a process of Fourier transformation and inversion provides a unified description of synthetic aperture radar (SAR), inverse SAR (ISAR) and hybrid SAR/ISAR techniques. The degradation of the resulting imagery arising from errors in the estimation of target and platform motions and operation in the near field is ...
N.J. Porter, R.J.A. Tough, K.D. Ward
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Superresolution techniques and ISAR imaging

Proceedings of the IEEE National Radar Conference, 2003
High-resolution optimal estimation techniques are applied to the problem of radar imaging of rotating objects, sometimes referred to as ISAR (inverse synthetic array radar) imaging. Typical digital range-Doppler processing operations are described, utilizing two spectral estimation techniques. Quality ISAR images have been obtained from such processing,
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ISAR imaging via adaptive sparse recovery

2013 IEEE International Geoscience and Remote Sensing Symposium - IGARSS, 2013
A novel high resolution ISAR imaging method based on adaptive sparse recovery is proposed in his paper. The ISAR signal in each range bin is sparsely represented by an over-complete chirplet basis matrix, which can be determined by an unknown parameter set. An adaptive parametric sparse recovery method is proposed to retrieve both the parameter set and
Wei Rao 0005, Gang Li 0008, Xiqin Wang
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ISAR Imaging via Sparse Probing Frequencies

IEEE Geoscience and Remote Sensing Letters, 2011
Based on compressive sampling theory, a novel method for high-resolution inverse synthetic aperture radar (ISAR) imaging is presented in this letter by transmitting sparse probing frequencies. In this method, only a few measurements in the range frequency and cross-range time domains are needed to reconstruct the target scene by solving an inverse ...
Hongxian Wang, Yinghui Quan, Mengdao Xing, Shouhong Zhang   +3 more
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ISAR imaging of rolling, pitching and yawing targets

Proceedings of International Radar Conference, 2002
This paper deals with the problem of ISAR imaging of targets in rectilinear motion in the presence of pitch, roll and yaw. We define a model of the received signal in the presence of the angular motions and we calculate the impulse response of the imaging system. From this preliminary analysis we find that the ISAR system behaves as a spatially variant
BERIZZI, FABRIZIO, DIANI, MARCO
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Fine micro-Doppler analysis in ISAR imaging

2007 IEEE International Geoscience and Remote Sensing Symposium, 2007
In ISAR imaging, it's well known that rotating parts of a target such as wheels or rotors induce additional features in the Doppler frequency spectrum. These features are called micro-Doppler effect and appear as sidebands around the central Doppler frequency.
Antoine Ghaleb, Luc Vignaud, Jean-Marie Nicolas 0002   +2 more
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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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ISAR Image Reconstruction Algorithm's Structure

10th International Conference on Telecommunications and Remote Sensing, 2021
Andon Lazarov, Ivan Garvanov
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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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