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High-Resolution Wide-Swath Ambiguous Synthetic Aperture Radar Modes for Ship Monitoring

Ustalli, Nertjana and Villano, Michelangelo (2022) High-Resolution Wide-Swath Ambiguous Synthetic Aperture Radar Modes for Ship Monitoring. Remote Sensing. Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/rs14133102. ISSN 2072-4292.

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Official URL: https://www.mdpi.com/2072-4292/14/13/3102


This paper proposes two high-resolution, wide-swath synthetic aperture radar (SAR) acquisition modes for ship monitoring that tolerate ambiguities and do not require digital beamforming. Both modes, referred to as the low pulse repetition frequency (PRF) and the staggered (high PRF) ambiguous modes, make use of a wide elevation beam, which can be obtained by phase tapering. The first mode is a conventional stripmap mode with a PRF much lower than the nominal Doppler bandwidth, allowing for the imaging of a large swath, because the ships’ azimuth ambiguities can be recognized as they appear at known positions. The second mode exploits a continuous variation of the pulse repetition interval, with a mean PRF greater than the nominal Doppler bandwidth as the range ambiguities of the ships are smeared and are unlikely to determine false alarms. Both modes are thought to operate in open sea surveillance, monitoring Exclusive Economic Zones or international waters. Examples of implementation of both modes for TerraSAR-X show that ground swaths of 120 km or 240 km can be mapped with 2 m2 resolution, ensuring outstanding detection performance even for small ships. The importance of resolution over noise and ambiguity level was highlighted by a comparison with ScanSAR modes that image comparable swaths with better noise and ambiguity levels but coarser resolutions.

Item URL in elib:https://elib.dlr.de/187181/
Document Type:Article
Title:High-Resolution Wide-Swath Ambiguous Synthetic Aperture Radar Modes for Ship Monitoring
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Villano, MichelangeloUNSPECIFIEDhttps://orcid.org/0000-0002-1769-6927UNSPECIFIED
Date:June 2022
Journal or Publication Title:Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
Keywords:mbiguities; high-resolution wide-swath imaging; pulse repetition frequency (PRF); ship detection; staggered; 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 - Earth Observation
DLR - Research theme (Project):R - SAR missions
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Ustalli, Nertjana
Deposited On:04 Jul 2022 09:56
Last Modified:04 Jul 2022 09:56

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