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Point Target Correction Coefficients For Absolute SAR Calibration

Döring, Björn J. and Looser, Philipp and Jirousek, Matthias and Schwerdt, Marco (2011) Point Target Correction Coefficients For Absolute SAR Calibration. In: Proceedings of the IEEE International Instrumentation and Measurement Technology Conference (I2TMC). IEEE International Instrumentation and Measurement Technology Conference (I2TMC), 2011-05-10 - 2011-05-12, Binjiang, Hanghzou, China.

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Abstract

A synthetic aperture radar (SAR) system measures the radar reflectivity of the earth's surface for a multitude of scientific and commercial applications. In many cases, accurate absolutely calibrated images are required by end-users. The backscattering from man-made point targets like passive corner reflectors and active transponders is often used as a radiometric calibration standard for synthetic aperture radar (SAR) calibration. As new systems emerge and the demand for more accurate systems increases, it becomes necessary to better understand the effects of real or imperfect targets on the calibration results. Therefore, a point target SAR simulator is presented which models the complete external radiometric calibration process. It incorporates a number of target properties like frequency response, transponder internal calibration strategies, noise, and interference signals, and it takes the SAR mode settings into consideration. Thereby, the relevant target backscatter variation as observed in the processed SAR image with respect to an ideal or any other target can be determined. The simulation results are relevant both during the design process of a new target as well as during the actual calibration. Based on these point target simulations, correction coefficients can be stated for each target and SAR mode, therefore decreasing the remaining radiometric point target uncertainties. Also, the cross-calibration between two different SAR systems becomes more accurate.

Item URL in elib:https://elib.dlr.de/68854/
Document Type:Conference or Workshop Item (Speech, Paper)
Additional Information:(c) 2011 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Title:Point Target Correction Coefficients For Absolute SAR Calibration
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Döring, Björn J.UNSPECIFIEDUNSPECIFIED
Looser, PhilippUNSPECIFIEDUNSPECIFIED
Jirousek, MatthiasUNSPECIFIEDUNSPECIFIED
Schwerdt, MarcoUNSPECIFIEDUNSPECIFIED
Date:11 May 2011
Journal or Publication Title:Proceedings of the IEEE International Instrumentation and Measurement Technology Conference (I2TMC)
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:calibration, SAR simulation, point targets
Event Title:IEEE International Instrumentation and Measurement Technology Conference (I2TMC)
Event Location:Binjiang, Hanghzou, China
Event Type:international Conference
Event Dates:2011-05-10 - 2011-05-12
Organizer:IEEE Instrumentation and Measurement Society
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignment
DLR - Research area:Space
DLR - Program:W - no assignment
DLR - Research theme (Project):W - no assignment (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Spaceborne SAR Systems
Deposited By: Döring, Björn
Deposited On:04 Feb 2011 09:30
Last Modified:12 Dec 2013 21:14

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