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Are Pixel Intensities Proportional To Radar Cross Section In SAR Images?

Döring, Björn J. and Schwerdt, Marco (2012) Are Pixel Intensities Proportional To Radar Cross Section In SAR Images? In: Proceedings of IEEE International Geoscience and Remote Sensing Symposium (IGARSS), pp. 1-3. IEEE. IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2012-07-23 - 2012-07-27, Munich, Germany.

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Abstract

Radar cross section has long been the measurement quantity of choice to describe the radar reflectivity of point targets in calibrated synthetic aperture radar (SAR) images. Derived quantities like the backscatter coefficient are equally in wide-spread use to radiometrically describe, in scientific applications often even more relevant, distributed targets. This paper now raises the question if radar cross section (RCS) really is the best choice to link pixel intensities or digital numbers to a physical unit. In fact, it is shown that RCS actually is not a good choice out of two major reasons, both of which result from the RCS being frequency dependent. The authors propose to distinguish the radar cross section, a body property, from the actual radiometric measurement quantity in SAR images by introducing the dedicated term equivalent RCS. Additionally, the implications for measurements and radiometric calibration are described.

Document Type:Conference or Workshop Item (Speech)
Additional Information:Copyright 2012 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:Are Pixel Intensities Proportional To Radar Cross Section In SAR Images?
Authors:
AuthorsInstitution or Email of Authors
Döring, Björn J.UNSPECIFIED
Schwerdt, MarcoUNSPECIFIED
Date:25 July 2012
Journal or Publication Title:Proceedings of IEEE International Geoscience and Remote Sensing Symposium (IGARSS)
Refereed publication:Yes
Page Range:pp. 1-3
Publisher:IEEE
Status:Published
Keywords:SAR, calibration, point target
Event Title:IEEE International Geoscience and Remote Sensing Symposium (IGARSS)
Event Location:Munich, Germany
Event Type:international Conference
Event Dates:2012-07-23 - 2012-07-27
Organizer:IEEE
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Projekt TerraSAR-X Kalibration und Projektunterstützung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Spaceborne SAR Systems
Deposited By: Björn Döring
Deposited On:27 Jun 2012 11:43
Last Modified:21 Mar 2014 15:06

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