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Concurrent Imaging Mode Applied to High Resolution Wide Swath SAR Imaging

Turchetti Ribeiro, João Pedro (2022) Concurrent Imaging Mode Applied to High Resolution Wide Swath SAR Imaging. Master's, Instituto Tecnologico de Aeronautica (ITA).

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Synthetic aperture radar (SAR) is gradually becoming mainstream for imaging of the Earth’s surface due to its all-weather day-and-night functionality. Its increasing image quality tied to the capabilities of polarimetry, interferometry, and tomography turns it into a very attractive technology for a continuous monitoring of global phenomena (such as glacier retreat, deforestation, and sea ice coverage), surveillance, farming and numerous other applications. Therefore, imaging wide swaths with high resolution (HRWS) is a key line of research for the future generation of SAR systems. One of the recently proposed techniques to increase imaging capability and flexibility is the concurrent imaging mode. This mode allows for simultaneous acquisitions of two areas by increasing the pulse repetition frequency and interleaving the transmission and reception of both modes in a pulse-to-pulse manner. Due to intrinsic system limitations, this technique applied to current operational systems, such as the German satellite TerraSAR-X, comes along with strong trade-offs in terms of limited swath width and increased ambiguity levels. In this Master’s thesis, multiple techniques are investigated to improve the concurrent mode within the scope of the next generation of SAR systems. Given that those systems are still under development and there is no strict restriction on what is available, a vast range of technologies and possibilities are analyzed in this work, such as orthogonal frequency division multiplexing (OFDM), frequency scanning (F-Scan), and displaced phase centers antenna (DPCA) technique. F-Scan is shown to comply well with the requirements, achieving significant improvements not only in range performance but also in scene size, all of this under a relatively simple and inexpensive system. Finally, global performance simulations and improvement predictions are carried out within the framework of the upcoming German X-Band HRWS mission, which is planned to use F-Scan operationally.

Item URL in elib:https://elib.dlr.de/186012/
Document Type:Thesis (Master's)
Title:Concurrent Imaging Mode Applied to High Resolution Wide Swath SAR Imaging
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Turchetti Ribeiro, João PedroUNSPECIFIEDhttps://orcid.org/0000-0003-3341-0105UNSPECIFIED
Date:23 November 2022
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Number of Pages:130
Keywords:SAR, concurrent imaging, high-resolution wide-swath
Institution:Instituto Tecnologico de Aeronautica (ITA)
Department:Divisão de Engenharia Eletrônica (IEE)
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 - Support TerraSAR-X/TanDEM-X operations
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Spaceborne SAR Systems
Deposited By: Kraus, Thomas
Deposited On:11 Apr 2022 06:23
Last Modified:05 Dec 2022 09:25

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