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Outdoor RCS Measurement Range for Spaceborne SAR Calibration Targets

Döring, Björn und Schwerdt, Marco und Bauer, Robert (2007) Outdoor RCS Measurement Range for Spaceborne SAR Calibration Targets. In: AMTA 2007 Proceedings. Antenna Measurement Techniques Association (AMTA), 2007-11-04 - 2007-11-09, St. Louis, MO, USA.

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Kurzfassung

The Microwaves and Radar Institute regularly performs calibration campaigns for spaceborne synthetic aperture radar (SAR) systems, among which have been X-SAR, SRTM, and ASAR. Tight performance specifications for future spaceborne SAR systems like TerraSAR-X and TanDEM-X demand an absolute radiometric accuracy of better than 1 dB. The relative and absolute radiometric calibration of SAR systems depends on reference point targets (i. e. passive corner reflectors and active transponders), which are deployed on ground, with precisely known radar cross section (RCS). An outdoor far-field RCS measurement facility has been designed and an experimental test range has been implemented in Oberpfaffenhofen to precisely measure the RCS of reference targets used in future X-band SAR calibration campaigns. Special attention has been given to the fact that the active calibration targets should be measured under the most realistic conditions, i. e. utilizing chirp impulses (bandwidth up to 500 MHz, pulse duration of 2 µs for a 300 m test range). Tests have been performed to characterize the test range parameters. They include transmit/receive decoupling, background estimation, and two different amplitude calibrations: both direct (calibration with accurately known reference target) and indirect (based on the radar range equation and individual characteristics). Based on an uncertainty analysis, a good agreement between both methods could be found. In this paper, the design details of the RCS measurement facility and the characterizing tests including amplitude calibration will be presented.

Dokumentart:Konferenzbeitrag (Vortrag, Paper)
Titel:Outdoor RCS Measurement Range for Spaceborne SAR Calibration Targets
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Döring, BjörnNICHT SPEZIFIZIERT
Schwerdt, MarcoNICHT SPEZIFIZIERT
Bauer, RobertNICHT SPEZIFIZIERT
Datum:Oktober 2007
Erschienen in:AMTA 2007 Proceedings
Referierte Publikation:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Far-field range, RCS measurement, SAR calibration targets
Veranstaltungstitel:Antenna Measurement Techniques Association (AMTA)
Veranstaltungsort:St. Louis, MO, USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2007-11-04 - 2007-11-09
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Projekt TerraSAR-X Kalibration und Projektunterstützung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Hochfrequenztechnik und Radarsysteme > Mikrowellen-Systeme
Institut für Hochfrequenztechnik und Radarsysteme
Hinterlegt von: Björn Döring
Hinterlegt am:13 Feb 2008
Letzte Änderung:12 Dez 2013 20:28

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