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Investigation of Alternatives for the Calibration of Reflector-Antenna SAR Systems with Multiple Azimuth Channels

Reis Pinheiro, Felipe Celso (2019) Investigation of Alternatives for the Calibration of Reflector-Antenna SAR Systems with Multiple Azimuth Channels. Bachelor's, Instituto Tecnológico de Aeronáutica.

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Abstract

Reflector antennas with a multichannel feed are a well-known trend for the implementation of new High-Resolution Wide-Swath (HRWS) imaging methods. Advantages include a larger antenna aperture, which provides improved gain. In combination with SCORE, this enables the system to image a wider swath. For instance in the Tandem-L mission, these factors contribute to enable the system to map the entire Earth’s surface in a shorter time. The use of multiple azimuth channels is a promising extension of such systems. Most applications as well as azimuth beamforming techniques are known to require precise pattern knowledge. During the flight path of a SAR system, phase and magnitude imbalances on the azimuth patterns arise, due e.g. to temperature and gravity variations influencing the feed and reflector geometry. These influence the backscattered signals received by the channels. The objective of the Along-Track Calibration methods is to suppress these imbalances, yielding a better performance for applications and improved image quality after beamforming. Many Along-Track Calibration methods have well-known behavior and proven efficiency for Planar Antenna-Based SAR systems. However, in the rather new reflector case, a gap remains to be filled regarding calibration techniques, as known calibration techniques cannot be directly applied due to different channel properties (including channel correlation). The work analyses some sources of phase and magnitude imbalances on Digital-Array-Fed Reflectors with multiple channels in azimuth. Alternatives to overcome this challenge are investigated, by exploring analogies between Planar and Reflector-Based systems. Specifically, an approach to extend the Digital Channel Balancing technique to reflector systems, suitable for correction of residual calibration errors, is analyzed in detail.

Item URL in elib:https://elib.dlr.de/119162/
Document Type:Thesis (Bachelor's)
Title:Investigation of Alternatives for the Calibration of Reflector-Antenna SAR Systems with Multiple Azimuth Channels
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Reis Pinheiro, Felipe CelsoUNSPECIFIEDUNSPECIFIED
Date:2019
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Unpublished
Keywords:HRWS SAR, Multichannel SAR Systems, Calibration
Institution:Instituto Tecnológico de Aeronáutica
Department:Divisão de Engenharia Eletrônica
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 Tandem-L Vorstudien
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Queiroz de Almeida, Felipe
Deposited On:29 Oct 2018 11:27
Last Modified:29 Oct 2018 11:27

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