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Multichannel Staggered SAR Azimuth Processing

Felipe Queiroz de Almeida, Marwan Younis, Gerhard Krieger, Alberto Moreira
2018 IEEE Transactions on Geoscience and Remote Sensing  
This paper introduces and analyzes in detail processing techniques suitable for the combination of these techniques, leading to novel multichannel Staggered SAR imaging modes with the potential for very  ...  Since these are contradicting drivers in terms of system design, different alternatives for High-Resolution Wide Swath (HRWS) SAR imaging have been investigated, relying on digital beamforming (DBF) and  ...  opportunity for image acquisitions with very high resolution over ultra-wide swaths, combining the strength of both methods.  ... 
doi:10.1109/tgrs.2017.2783444 fatcat:vqjem4hakjgzvakmenhw5lx5ku

A HYBRID MULTICHANNEL PROCESSING METHOD FOR SPACEBORNE HYBRID PHASED-MIMO SAR WITH APPLICATION TO MULTI-DIRECTION SWATH IMAGING

Lele Zhang, Dianren Chen
2015 Progress in Electromagnetics Research B  
This paper proposes a hybrid multichannel processing method for spaceborne Hybrid Phased-MIMO SAR (HPMSAR) that can achieve different applications of multi-direction swath imaging on the same platform.  ...  The method is optimal because it is a combination of two-dimension (2-D) advanced digital beamforming (DBF) technology and multichannel pre-filter technology for highresolution wide-swath SAR signal processing  ...  ACKNOWLEDGMENT The authors would like to thank the editor and anonymous reviewers for their valuable time, comments, and suggestions to improve the quality and readability of this paper.  ... 
doi:10.2528/pierb15072705 fatcat:mm7whnmwbbalfntsjq2brai27i

AZIMUTH MULTICHANNEL SAR IMAGING BASED ON COMPRESSED SENSING

Mingjiang Wang, Weidong Yu, Robert Wang
2013 Electromagnetic Waves  
Azimuth multichannel is a promising technique of realizing high resolution and wide swath for synthetic aperture radar (SAR) imaging, which consequently leads to extremely high data rate on satellite downlink  ...  system and confronts serious ambiguity in subsequent processing due to its strict limitation of pulse repetition frequency (PRF).  ...  AZIMUTH MULTICHANNEL SAR IMAGING MODEL Azimuth multichannel technique is an innovative approach to achieve high resolution and wide swath SAR imaging.  ... 
doi:10.2528/pier13052205 fatcat:3xvwdaq3zfedvmt7lrzbggqvbi

German Spaceborne SAR Missions

Alberto Moreira, Manfred Zink, Michael Bartusch, Adriana Elizabeth Nuncio Quiroz, Samuel Stettner
2021 2021 IEEE Radar Conference (RadarConf21)  
The paper concludes with an overview of the innovative concepts, technologies, imaging techniques and applications planned for the future national SAR missions Tandem-L and HRWS.  ...  This paper provides an overview of the German spaceborne radar program starting with the X-band synthetic aperture radar (SAR) instrument on board the Shuttle Imaging Radar missions (SIR-C/X-SAR) in 1994  ...  In addition, the signal is properly oversampled in azimuth, so that it is possible to accurately interpolate the data on a uniform grid and obtain a high-resolution SAR image over a wide continuous swath  ... 
doi:10.1109/radarconf2147009.2021.9455326 fatcat:42vaxlvdyvg5lountil55thfvu

Azimuth Phase Center Adaptation on Transmit for High-Resolution Wide-Swath SAR Imaging

N. Gebert, G. Krieger
2009 IEEE Geoscience and Remote Sensing Letters  
Synthetic aperture radar (SAR) systems with multiple receive channels allow for high-resolution wide-swath imaging thus overcoming a fundamental limitation of conventional single-aperture SAR.  ...  Index Terms-Digital beamforming (DBF) on receive, highresolution wide-swath synthetic aperture radar (SAR), optimized multichannel azimuth processing, phase center adaptation.  ...  First, Section II introduces a multichannel system example to image a swath of 100 km with a geometric resolution in azimuth of 1 m.  ... 
doi:10.1109/lgrs.2009.2025245 fatcat:m3bxkvgq6nh6tayqfvgrf2wix4

Performance investigation on the high-resolution wide-swath SAR system operating in stripmap quad-pol and ultra-wide scansar mode

Federica Bordoni, Marwan Younis, Gerhard Krieger
2011 2011 IEEE International Geoscience and Remote Sensing Symposium  
The High-Resolution Wide-Swath (HRWS) is the spaceborne Synthetic Aperture Radar system, promoted by the German Aerospace Centre, conceived to obtain simultaneously high spatial resolution and width swaths  ...  The HRWS allows for a spatial resolution of 1 m over swaths 70 km wide, in the basic Stripmap mode.  ...  Among these new SAR systems, the High-Resolution Wide-Swath (HRWS), promoted by the German Aerospace Centre (DLR), merges the advantages of an extensive illumination capability with the sensitivity provided  ... 
doi:10.1109/igarss.2011.6132539 fatcat:dmidnzaq2rfntpbq7opjdqeuza

Virtual multichannel SAR for ground moving target imaging

Alessio Bacci, Samuele Gelli, Douglas Andrew Gray, Fabrizio Berizzi, Marco Martorella
2016 IET radar, sonar & navigation  
In this paper a processing scheme that exploits high PRF single channel SAR system to emulate a multichannel SAR is presented.  ...  The signal model for both target and clutter components are presented and the difference with respect to an actual M-SAR are highlighted.  ...  CONCLUSION The applicability of SDAP-ISAR processing to obtain high resolution ISAR images of non-cooperative moving ground targets with a single channel SAR system has been demonstrated.  ... 
doi:10.1049/iet-rsn.2015.0128 fatcat:bzzqn4szoveuxk63tzbg7ulnpy

Adaptive reconstruction for azimuth signal of multichannel HRWS SAR imaging system

Linjian Zhang, Yesheng Gao, Xingzhao Liu
2018 EURASIP Journal on Advances in Signal Processing  
The reconstruction of azimuth signal in multichannel synthetic aperture radar (SAR) for high-resolution and wide-swath (HRWS) imaging requires exact steering vectors.  ...  Firstly, we discuss the azimuth sampling of multichannel SAR and derive the equation of ambiguity index. We then utilize the azimuth cross-correlation to determine the aliasing number.  ...  The authors also thank IECAS for providing the multichannel airborne SAR raw data to this manuscript.  ... 
doi:10.1186/s13634-018-0562-8 fatcat:g22l5lxkuncnriimychkzjjlpe

Unambiguous SAR Signal Reconstruction From Nonuniform Displaced Phase Center Sampling

G. Krieger, N. Gebert, A. Moreira
2004 IEEE Geoscience and Remote Sensing Letters  
The displaced phase center (DPC) technique will enable a wide-swath synthetic aperture radar (SAR) with high azimuth resolution.  ...  Index Terms-Azimuth ambiguities, digital beamforming, displaced phase center antenna (DPCA), high-resolution wide-swath SAR, interferometry, synthetic aperture radar (SAR).  ...  ACKNOWLEDGMENT The authors thank the anonymous reviewers for their valuable comments and suggestions to improve the paper.  ... 
doi:10.1109/lgrs.2004.832700 fatcat:wy7of6zadnentpf4z3pxcovz54

Interferometric Synthetic Aperture Radar (SAR) Missions Employing Formation Flying

Gerhard Krieger, Irena Hajnsek, Konstantinos Panagiotis Papathanassiou, Marwan Younis, Alberto Moreira
2010 Proceedings of the IEEE  
After a short introduction to the basic principles and applications of SAR interferometry, designs for the twin satellite missions TanDEM-X and Tandem-L are presented.  ...  The sophisticated mission concept and the high data-acquisition capacity of Tandem-L will moreover provide a unique data source to systematically observe, analyze, and quantify the dynamics of a wide range  ...  They thank the anonymous reviewers for their valuable comments and suggestions that helped to improve the manuscript.  ... 
doi:10.1109/jproc.2009.2038948 fatcat:hgvhvfr4tvhsvhpwhdwgbu7m6e

Analysis of Low-Oversampled Staggered SAR Data

Muriel Pinheiro, Pau Prats-Iraola, Marc Rodriguez-Cassola, Michelangelo Villano
2019 IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing  
aperture radar (SAR) data over wide areas.  ...  This paper also presents simulation results that show the impact of staggered data for interferometric applications.  ...  The authors in [5] demonstrated the staggered SAR concept, which together with SCORE allows for the coverage of a continuous wide swath with high resolution.  ... 
doi:10.1109/jstars.2019.2959092 fatcat:4gjoigvyfbcx5daosds4tzcliq

Azimuth Multichannel Reconstruction for Moving Targets in Geosynchronous Spaceborne–Airborne Bistatic SAR

Wei Xu, Zhengbin Wei, Pingping Huang, Weixian Tan, Bo Liu, Zhiqi Gao, Yifan Dong
2020 Remote Sensing  
In a multichannel geosynchronous spaceborne–airborne bistatic synthetic aperture radar (GEO-SA-BiSAR) system, the airborne receiver can obtain high-resolution microwave images with good signal-to-noise  ...  To resolve these problems, a modified multichannel reconstruction method in azimuth channel GEO-SA-BiSAR is proposed according to the azimuth multichannel impulse response of the imaged moving target.  ...  Similar to the high resolution wide swath (HRWS) SAR system [18] , the azimuth multichannel imaging scheme could resolve this contradiction by introducing additional azimuth spatial samples.  ... 
doi:10.3390/rs12111703 fatcat:yl5zppm5ine63gqohgd5wal27i

Multi-channel SAR system design for HRWS and GMTI in low PRF

Xuepan Zhang, Chen Yang, Xuejing Zhang, Qingqing Lin
2019 IEEE Access  
High-resolution and wide-swath (HRWS) is an important challenge in synthetic aperture radar (SAR).  ...  Combined SAR with array, the azimuth dual-channel SAR configuration achieves high azimuth resolution and HRWS in low Pulse repetition frequency (PRF) by doppler band synthesizing technology.  ...  Along track multichannel SAR with low PRF to achieve wide swath is used to suppress the Doppler ambiguity for realizing HRWS imaging [8] - [10] .  ... 
doi:10.1109/access.2019.2957307 fatcat:pf3hglkfajgkno4l77xxuoiaz4

On-Ground RFI Mitigation for Spaceborne Multichannel SAR Systems Using Auxiliary Beams

Tobias Bollian, Marwan Younis, Gerhard Krieger, Alberto Moreira
2022 IEEE Transactions on Geoscience and Remote Sensing  
Furthermore, it is shown that the information collected with an auxiliary beam can also be used to filter the RFI signal when it is spatially nonorthogonal to the SAR signal.  ...  Radio frequency interference (RFI) is becoming a major concern for future synthetic aperture radar (SAR) missions due to the increased user demand for frequency occupation in a number of applications.  ...  The authors are with the Microwaves and Radar Institute, German Aerospace Center (DLR), 82234 Wessling, Germany (e-mail: tobias.bollian@dlr.de). Digital Object Identifier 10.1109/TGRS.2022.3146789  ... 
doi:10.1109/tgrs.2022.3146789 fatcat:qfghcvcovncoljtgkjd7vb5zfm

Efficient Evaluation of Multichannel SAR Data Recombination Filters

Moritz Kiemer, Helko Breit
2017 IEEE Transactions on Geoscience and Remote Sensing  
Recombination of multiple channels with displaced phase centers has been proposed as a convenient way to create high resolution wide-swath images.  ...  As applications become more demanding, it is desirable to overcome the limitations imposed by the SAR principle, one of which is the tradeoff between the swath width and the instantaneous azimuth bandwidth  ...  This results in the well-known conflict between azimuth resolution and swath-width of classical SAR imaging modes [1, 4.5.3 ]. Several techniques have been developed to overcome this limitation.  ... 
doi:10.1109/tgrs.2017.2724918 fatcat:rwm7oxwzrbe5bh5nkiernvflvu
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