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Processing Techniques for Nadir Echo Suppression in Staggered Synthetic Aperture Radar

Nogueira Peixoto, Maxwell and Villano, Michelangelo (2022) Processing Techniques for Nadir Echo Suppression in Staggered Synthetic Aperture Radar. IEEE Geoscience and Remote Sensing Letters. IEEE - Institute of Electrical and Electronics Engineers. doi: 10.1109/LGRS.2022.3157445. ISSN 1545-598X.

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Official URL: https://ieeexplore.ieee.org/document/9729872


Synthetic aperture radar (SAR) is a class of high-resolution imaging radar particularly suitable for satellite remote sensing with diverse applications, such as biomass and ice monitoring, generation of digital elevation models, and measuring of subsidence. Staggered SAR is a novel mode of operation under consideration for the next-generation SAR missions such as Tandem-L and NASA-ISRO SAR. It uses digital beamforming and a continuous variation of the pulse repetition interval (PRI) to achieve high azimuth resolution over a much wider, continuous swath than is traditionally possible. This PRI variation renders infeasible use of existing methods to avoid nadir echoes, which might impair the quality of staggered SAR images. This work proposes processing techniques that mitigate the impact of nadir echoes in staggered SAR through localization and thresholding-and-blanking of these echoes in range-compressed data and recovery of part of the underlying useful signal through interpolation. The performance of these processing techniques is evaluated through simulations using real TerraSAR-X data. The proposed technique can be implemented as an optional stage in the processing chain of future staggered SAR missions and leads to improved image quality at a reasonable additional computational cost.

Item URL in elib:https://elib.dlr.de/185674/
Document Type:Article
Title:Processing Techniques for Nadir Echo Suppression in Staggered Synthetic Aperture Radar
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Nogueira Peixoto, MaxwellUNSPECIFIEDhttps://orcid.org/0000-0003-4333-8012UNSPECIFIED
Villano, MichelangeloUNSPECIFIEDhttps://orcid.org/0000-0002-1769-6927UNSPECIFIED
Date:8 March 2022
Journal or Publication Title:IEEE Geoscience and Remote Sensing Letters
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Keywords:High-resolution wide-swath (HRWS) imaging, multiple-elevation-beam synthetic aperture radar (SAR), nadir echo, NASA-ISRO SAR (NISAR), SAR, staggered SAR, Tandem-L
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - SAR missions
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Nogueira Peixoto, Maxwell
Deposited On:15 Mar 2022 10:30
Last Modified:24 May 2022 23:48

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