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Azimuth Reconstruction Algorithm for Multistatic SAR Formations with Large Along-track Baselines

Sakar, Nida and Rodriguez Cassola, Marc and Prats, Pau and Moreira, Alberto (2019) Azimuth Reconstruction Algorithm for Multistatic SAR Formations with Large Along-track Baselines. IEEE Transactions on Geoscience and Remote Sensing. IEEE - Institute of Electrical and Electronics Engineers. ISSN 0196-2892

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Abstract

A multistatic synthetic aperture radar (SAR) system offers the potential of exceeding the capabilities of conventional SARs in various ways, one of which is to realize high-resolution imaging over wide swaths when operated under the Nyquist frequency. Due to the decrease of the operational pulse repetition frequency, the Doppler spectrum of the received data of the single channels appears strongly aliased and needs to be resolved via azimuth reconstruction. Our aim in this article is to suggest an accurate reconstruction strategy that is applicable to multistatic SAR systems also with large along-track baselines and very high resolution on curved orbits. The algorithm, which can be regarded as a generalized reconstruction in the range-Doppler domain, operates in two steps and is capable of correcting most of the polychromatic deviations over large areas, achieving accurate reconstruction in constellations with kilometric baselines, resolutions of about 15λ over swaths of hundreds of kilometers. The validity of our approach has been tested using point targets in two- and six-receiver multistatic configurations.

Item URL in elib:https://elib.dlr.de/131972/
Document Type:Article
Title:Azimuth Reconstruction Algorithm for Multistatic SAR Formations with Large Along-track Baselines
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Sakar, NidaNida.Sakar (at) dlr.deUNSPECIFIED
Rodriguez Cassola, MarcMarc.Rodriguez (at) dlr.deUNSPECIFIED
Prats, PauPau.Prats (at) dlr.dehttps://orcid.org/0000-0002-7583-2309
Moreira, AlbertoAlberto.Moreira (at) dlr.dehttps://orcid.org/0000-0002-3436-9653
Date:November 2019
Journal or Publication Title:IEEE Transactions on Geoscience and Remote Sensing
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Publisher:IEEE - Institute of Electrical and Electronics Engineers
ISSN:0196-2892
Status:Published
Keywords:Digital beamforming, high-resolution wideswath (HRWS) radar, multistatic radar signal processing, synthetic aperture radar (SAR)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Flugzeug-SAR
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > SAR Technology
Deposited By: Sakar, Nida
Deposited On:06 Dec 2019 10:33
Last Modified:06 Dec 2019 10:33

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