elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Development, Implementation, and Analysis of a Multiple-Input Multiple-Output Concept for Spaceborne High-Resolution Wide-Swath Synthetic Aperture Radar

Rommel, Tobias (2018) Development, Implementation, and Analysis of a Multiple-Input Multiple-Output Concept for Spaceborne High-Resolution Wide-Swath Synthetic Aperture Radar. Dissertation, Technische Universität Chemnitz.

[img] PDF
24MB

Abstract

Since the development of the first Synthetic Aperture Radar (SAR), radar has become an important sensor for imaging applications. Manifold fields of application ranging from climate change research, over change-detection, and 4-D mapping up to earthquake and flood monitoring are covered by SAR. Especially high-resolution, day- and night-, as well as weather-independent imaging capabilities led to the success of recent spaceborne SAR missions. However, due to a high demand for global SAR data sets, state-of-the-art sensors reach their limits in terms of resolution, swath-width, repeat cycle, and flexibility. To solve SAR-inherent limitations, in this dissertation, a new generation of SAR sensors with multiple transmit and multiple receive channels (MIMO) and Digital Beam-Forming (DBF) capabilities is proposed. Apart from an increased flexibility, this enables a large variety of new operation- and acquisition-modes for high-resolution wide-swath SAR imaging. To separate the individual channels in the post-processing, established processing techniques can not be applied, since SAR is highly sensitive to interferences. Hence, the Space-Time-Frequency Adaptive Processing (STFAP) algorithm is derived, which allows channel separation without any interferences. Basically, STFAP forms frequency- and time-variant antenna beams, which follow the echo signals of each transmitted waveform individually. However, this method demands waveforms of certain structures, which are described and suitable waveform types are compared in detail. STFAP and other DBF-SAR techniques need very sharp antenna beams in elevation. In presence of unknown topography, when the assumed geometrical model of the Earth surface is complex, antenna pointing might be mismatched with the surface geometry. To handle this issue, it is suggested to apply an additional algorithm prior to DBF, which determines the angle of the incident echo signal on the antenna array. The algorithm, which is proposed in this dissertation, is based on the matrix pencil method and allows a highly accurate and signal-adaptive DBF in real-time. For an experimental verification of new imaging modes and STFAP, a groundbased MIMO-SAR demonstrator in X-band has been developed. The dissertation concludes with its description and promising experimental results, which proof that the suggested concepts have the potential to enhance the capabilities of state-of-the-art SAR sensors significantly.

Item URL in elib:https://elib.dlr.de/121524/
Document Type:Thesis (Dissertation)
Title:Development, Implementation, and Analysis of a Multiple-Input Multiple-Output Concept for Spaceborne High-Resolution Wide-Swath Synthetic Aperture Radar
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Rommel, TobiasTobias.Rommel (at) dlr.dehttps://orcid.org/0000-0003-1864-7585
Date:28 August 2018
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:265
Status:Published
Keywords:synthetic aperture radar (SAR), digital beam-forming (DBF), waveforms, multiple-input multiple-output (MIMO), matrix pencil, direction of arrival estimation, radar development
Institution:Technische Universität Chemnitz
Department:Fakultät für Elektrotechnik und Informationstechnik
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 Entwicklung eines Mini-SAR
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > SAR Technology
Deposited By: Rommel, Tobias
Deposited On:03 Sep 2018 13:25
Last Modified:31 Jul 2019 20:19

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.