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Evaluation of the Internal Calibration Methodologies for Spaceborne Synthetic Aperture Radars with Active Phased Array Antennas

Makhoul, Eduardo and Broquetas, Antoni and López-Dekker, Paco and Closa, Josep and Saameno, Paula (2012) Evaluation of the Internal Calibration Methodologies for Spaceborne Synthetic Aperture Radars with Active Phased Array Antennas. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 5 (3), pp. 909-918. DOI: 10.1109/JSTARS.2012.2199087. ISSN 1939-1404.

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Abstract

This paper presents a novel approach in the instrumental error analysis of Synthetic Aperture Radars (SAR) based on active phased array antennas (APAA). A residual post-calibration error exists due to differences between the calibration and operational excitations of the transmit/receive modules (TRMs) for those source errors that are monitored by the internal calibration facility. Analytical expressions are derived for the residual post-calibration errors and validated through intensive simulations of some instrumental errors for a specific sensor architecture. Alternative internal global calibration strategies are proposed to reduce the impact of the post-calibration error. The simulations show that the proposed elevation dependent calibration can provide a substantial reduction of the post-calibration errors even in the case of relaxed tolerance of the TRM weight setting errors.

Document Type:Article
Title:Evaluation of the Internal Calibration Methodologies for Spaceborne Synthetic Aperture Radars with Active Phased Array Antennas
Authors:
AuthorsInstitution or Email of Authors
Makhoul, EduardoUniversitat Politècnica de Catalunya
Broquetas, AntoniUniversitat Politècnica de Catalunya
López-Dekker, PacoUNSPECIFIED
Closa, JosepEADS-CASA Espacio
Saameno, PaulaEADS-CASA Espacio
Date:1 June 2012
Journal or Publication Title:IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:5
DOI:10.1109/JSTARS.2012.2199087
Page Range:pp. 909-918
ISSN:1939-1404
Status:Published
Keywords:Arrays , Calibration , Gain , Phased arrays , Radar antennas , Spaceborne radar, Synthetic aperture radar (SAR) , active phased array antenna (APAA) , internal calibration , transmit/receive modules (TRMs)
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 SAR-Expert-Support-Lab
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Paco Lopez Dekker
Deposited On:09 Jul 2012 09:46
Last Modified:07 Feb 2013 20:20

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