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A complex spectrum based SAR image resampling method with restricted target sidelobes and statistics preservation

Remy Abergel, Said Ladjal, Florence Tupin, Jean-Marie Nicolas
2017 2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS)  
The aim of this work is to present a resampling scheme for SAR images that preserves spatial resolution and produces statistically accurate images at the same time.  ...  We propose to resample the image in an adaptive and robust way so that the target smear is canceled and the new sampled image is completely faithful to the underlying signal.  ...  Pseudo-raw image and pseudo-raw spectrum Let u : Ω → C denote a complex-valued SAR image with domain Ω = IM × IN , where IK = {0, . . . , K − 1} .  ... 
doi:10.1109/igarss.2017.8128214 dblp:conf/igarss/AbergelLTN17 fatcat:roakzpquerdb3m36vb5acxouee

Subpixellic Methods for Sidelobes Suppression and Strong Targets Extraction in Single Look Complex SAR Images

Remy Abergel, Loic Denis, Said Ladjal, Florence Tupin
2018 IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing  
A statistically grounded approach for point-like target extraction is also introduced, thereby providing a decomposition of a single look complex image into two components: a speckle-dominated image and  ...  This paper describes strategies to cancel sidelobes around point-like targets while preserving the spatial resolution and the statistics of speckle-dominated areas.  ...  properties of speckled areas and prevents from spreading bright targets, (ii) a criterion based on the statistical framework of a contrario methods to detect targets in speckle, with an explicit control  ... 
doi:10.1109/jstars.2018.2790987 fatcat:7n7ydtxkcvcwlgpo4oeacsyfai

Capon- and APES-Based SAR Processing: Performance and Practical Considerations

Paco Lopez-Dekker, Jordi J Mallorqui
2010 IEEE Transactions on Geoscience and Remote Sensing  
Both methods improve the resolution and reduce sidelobes. APES yields generally better estimates of amplitude and phase than Capon but with worse resolution.  ...  An implementation of a Capon or APES processing chain is explained, and processing parameters such as chip-image size, resampling factor, and diagonal loading are discussed.  ...  Restrictions apply. Fig. 9 . 9 Comparison of the original SLC with APES and Capon reprocessed images for a detail of Barcelona.  ... 
doi:10.1109/tgrs.2009.2038902 fatcat:ly6jf4x3ercf5la5na5d6ivkya

SAR imaging via modern 2-D spectral estimation methods

S.R. DeGraaf
1998 IEEE Transactions on Image Processing  
The motivation for applying power spectrum estimation methods to SAR imaging is to improve resolution, remove sidelobe artifacts, and reduce speckle compared to what is possible with conventional Fourier  ...  This paper makes two principal contributions to the field of adaptive SAR imaging. First, it is a comprehensive comparison of 2-D spectral estimation methods for SAR imaging.  ...  ACKNOWLEDGMENT The author wishes to thank Wright Laboratory for providing DCS SAR data of the ships near Toledo, OH, and DCS fully polarimetric IFSAR data of the area around the University of Michigan  ... 
doi:10.1109/83.668029 pmid:18276288 fatcat:w7xej3vpffegrflsitjkkvy2tq

EMISAR: an absolutely calibrated polarimetric L- and C-band SAR

E.L. Christensen, N. Skou, J. Dall, K.W. Woelders, J.H. Jorgensen, J. Granholm, S.N. Madsen
1998 IEEE Transactions on Geoscience and Remote Sensing  
Digital technology has been utilized to realize a flexible and highly stable radar with variable resolution, swath width, and imaging geometry.  ...  The SAR is operated at high altitudes on a Gulfstream G-3 jet aircraft. The system is very well calibrated and has low sidelobes and low cross-polar contamination.  ...  The six different product images are spatially averaged and resampled at a 5 5-m ground pixel spacing using a low-pass filter.  ... 
doi:10.1109/36.729356 fatcat:cba7wgphtjdyhohf3isaiy5qlu

Coregistration of interferometric SAR images using spectral diversity

R. Scheiber, A. Moreira
2000 IEEE Transactions on Geoscience and Remote Sensing  
The proposed technique is based on the spectral properties of the complex SAR signal.  ...  This article presents a technique for the determination of the relative misregistration between two interferometric SAR images.  ...  Mittermayer, for useful discussions and for providing the ScanSAR processing routine. They would also like to thank the anonymous reviewers for their comments and suggestions.  ... 
doi:10.1109/36.868876 fatcat:ylfxi573kjhcxm5xa7lsl7zwya

Synthetic Aperture Sonar (SAS) without Navigation: Scan Registration as Basis for Near Field Synthetic Imaging in 2D

Heiko Bülow, Andreas Birk
2020 Sensors  
For the image registration of the raw sonar scans, a robust implementation of a spectral method is presented.  ...  It is shown that this pixel/voxel-based registration and the coherent processing of several scans forming a synthetic aperture yields substantial improvements of the image resolution.  ...  for the registration is presented in the form of a spectral method based on our previous work, and (c) the concrete implementation of our new approach to SAS is completed with a Delay and Sum (D&S) BF  ... 
doi:10.3390/s20164440 pmid:32784814 fatcat:icqpv7wka5f57iwhxr7bzikcgy

Evaluation of P-Band SAR Tomography for Mapping Tropical Forest Vertical Backscatter and Tree Height

Naveen Ramachandran, Sassan Saatchi, Stefano Tebaldini, Mauro Mariotti d'Alessandro, Onkar Dikshit
2021 Remote Sensing  
It is observed that radiometric compensation increases the backscatter values of the vertical profile with a slight shift in local maxima of the canopy layer for both the Capon and the MUSIC estimators  ...  Our results show that the relative root mean squared error (RMSE) of height was less than 10%, with negligible systematic errors across the range, with Capon and MUSIC performing better for height estimates  ...  Acknowledgments: We are grateful to the people and institutes that have contributed to the field data, G Vincent for tree height data, and Ludovic Villard, CESBIO, France, for the geocoding parameters  ... 
doi:10.3390/rs13081485 fatcat:h6s5qjfsmndcjc4k5p5aha74dy

2015 Index IEEE Transactions on Geoscience and Remote Sensing Vol. 53

2015 IEEE Transactions on Geoscience and Remote Sensing  
., +, TGRS May 2015 2323-2334 A Resample-Based SVA Algorithm for Sidelobe Reduction of SAR/ISAR Imagery With Noninteger Nyquist Sampling Rate.  ...  ., +, TGRS Feb. 2015 862-868 Interference suppression A Resample-Based SVA Algorithm for Sidelobe Reduction of SAR/ISAR Imagery With Noninteger Nyquist Sampling Rate.  ...  Radiofrequency interference A Methodology to Determine Radio-Frequency Interference in AMSR2 Observations.  ... 
doi:10.1109/tgrs.2015.2513444 fatcat:zuklkpk4gjdxjegoym5oagotzq

Synthetic-aperture radar imaging

C J Oliver
1989 Journal of Physics D: Applied Physics  
The targets in the SAR processor are approximated by a set of isotropic point scatterers with frequency-independent complex weights.  ...  This is illustrated in Fig. 6 The SAR aperture length was restricted to 300 m (resulting in 10 m image resolution) to keep the computational complexity at a manageable level.  ...  As with the matched filter, the optimization function is quadratic and positive and therefore its stationary point must be a minimum.  ... 
doi:10.1088/0022-3727/22/7/001 fatcat:6oelp7teyzdcteyp2hh22pqibe

2010 Index IEEE Transactions on Signal Processing Vol. 58

2010 IEEE Transactions on Signal Processing  
Banks With Partial Cosine Modulation; TSP June 2010 3390-3395 Zhou, J., see ., An Impulse Re- sponse Function for Evaluation of UWB SAR Imaging; TSP July 2010 3927-3932 W Wahls, S., and Boche, H.  ...  ., Empirical System Learning for Statistical Pattern Recognition With Non-Uniform Error Criteria; TSP Sept. 2010 4621-4633 Fu, X., and Jia, Y., An Improvement on Resampling Algorithm of Particle Filters  ...  Global Positioning System A Fixed-Lag Particle Filter for the Joint Detection/Compensation of Interference Effects in GPS Navigation.  ... 
doi:10.1109/tsp.2010.2092533 fatcat:4y66ezuo7zf6doe6nwjqwtc42i

Design of large polyphase filters in the Quadratic Residue Number System

Gian Carlo Cardarilli, Alberto Nannarelli, Yann Oster, Massimo Petricca, Marco Re
2010 2010 Conference Record of the Forty Fourth Asilomar Conference on Signals, Systems and Computers  
WA7b-4 11:30 AM MiMo-VSAR: A High Resolution Radar System for imaging Moving Scenes Benjamin Friedlander, University of California, San Diego The Velocity SAR (VSAR) is a SAR-based sensor system for high  ...  A joint AOA, AOD and DOA algorithm based on the Capon Beamformer is proposed to reduce complexity and computation time compared to subspace-based methods.  ... 
doi:10.1109/acssc.2010.5757589 fatcat:ccxnu5owr5fyrcjcqukumerueq

Multichannel Staggered SAR for High-Resolution Wide-Swath Imaging

Felipe Queiroz De Almeida
2018
Staggered SAR kombinieren.  ...  Die Dissertation beinhaltet sowohl neuartige Algorithmen für die Rekonstruktion von Mehrkanal-Staggered-SAR-Daten als auch Design-Beispiele für leistungsstarke HRWS-Satelliten-SAR-Systeme, die diese neue  ...  The azimuth spectrum of SAR data is complex and takes the shape of the azimuth antenna pattern (cf. [26] , Appendix B), with a bandwidth in the main beam.  ... 
doi:10.5445/ir/1000080475 fatcat:7szceyfnfvdcdkcb2omai7lrfa

2021 Index IEEE Transactions on Instrumentation and Measurement Vol. 70

2021 IEEE Transactions on Instrumentation and Measurement  
Article numbers are based on specified topic areas and corresponding codes associated with the publication.  ...  The primary entry includes the coauthors' names, the title of the paper or other item, and its location, specified by the publication abbreviation, year, and article number.  ...  Jung, D., +, TIM 2021 8500210 A Target Detection Scheme With Decreased Complexity and Enhanced Performance for Range-Doppler FMCW Radar.  ... 
doi:10.1109/tim.2022.3156705 fatcat:dmqderzenrcopoyipv3v4vh4ry

Magnetic resonance fingerprinting

Dan Ma, Vikas Gulani, Nicole Seiberlich, Kecheng Liu, Jeffrey L. Sunshine, Jeffrey L. Duerk, Mark A. Griswold
2013 Nature  
It starts with the method of generating imaging gradients from music, the main considerations of which were to preserve the sound of the music, to meet the hardware requirement of the scanner system, and  ...  Conventional B1 mapping methods in general fall into two classes: magnitude based methods and phase based methods.  ... 
doi:10.1038/nature11971 pmid:23486058 pmcid:PMC3602925 fatcat:pcgmnilvefelhcaxdw2xxmj4la
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