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Precipitation Effects for Ka-band SAR

Danklmayer, Andreas und Chandra, Madhukar (2009) Precipitation Effects for Ka-band SAR. In: Proceedings of Advanced RF Sensors For Earth Observation (ARSI). Advanced RF Sensors For Earth Observation (ARSI), 2009-11-16 - 2009-11-18, Noordwijk, Niederlande.

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Kurzfassung

Space-borne Synthetic Aperture Radar (SAR) imaging is often considered to possess both day/night and all weather operational capabilities. Whereas the first argument is true since we are dealing with an active sensor; the second does not hold in cases for which the operating frequencies are above ~ 3 GHz. Indeed, the SAR performance can be significantly affected by atmospheric effects (losses), especially at unfavourable weather conditions. The principal reasons for the restriction on the use of these higher frequencies can be found in clear air losses (water vapour and oxygen), cloud attenuation and attenuation due to precipitation, primarily rain. The scope of this paper covers the activities performed for an ESA-study (Danklmayer, 2009 [1]) under Task 1 (Survey on Precipitation Effects for SAR) and Task 2, the quantitative assessment of the propagation effects and the associated modelling. For the Ka-band rain rates of 10 mm/h are capable to produce visible artefacts. Depending on the climatic region on Earth, the availability of the investigated Ka-band system will vary. Assuming a 5 dB acceptance of the attenuation due to rain, which corresponds to 2 mm/h at 30° incidence angle for the modelled rain cell, the availability will be better than 98% for the European regions and better than 95% for rain-forest in Brazil. Finally, measures and possibilities are suggested, how to mitigate propagation effects in SAR images, together with an outlook on remaining issues to be addressed in future studies.

Dokumentart:Konferenzbeitrag (Vortrag, Paper)
Titel:Precipitation Effects for Ka-band SAR
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Danklmayer, AndreasNICHT SPEZIFIZIERT
Chandra, MadhukarChemnitz, University of Technology
Datum:November 2009
Erschienen in:Proceedings of Advanced RF Sensors For Earth Observation (ARSI)
Referierte Publikation:Nein
In ISI Web of Science:Nein
Herausgeber:
HerausgeberInstitution und/oder E-Mail-Adresse der Herausgeber
NICHT SPEZIFIZIERTESA
Status:veröffentlicht
Stichwörter:Synthetic Aperture Radar (SAR), microwave imaging, propagation effects, tropospheric effects, rain attenuation, Ka-band
Veranstaltungstitel:Advanced RF Sensors For Earth Observation (ARSI)
Veranstaltungsort:Noordwijk, Niederlande
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2009-11-16 - 2009-11-18
Veranstalter :Eurpean Space Agency
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 - Vorhaben SAR-Expert-Support-Lab (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Hochfrequenztechnik und Radarsysteme > Radarkonzepte
Hinterlegt von: Dr.-Ing. Andreas Danklmayer
Hinterlegt am:15 Dez 2009 16:02
Letzte Änderung:12 Dez 2013 20:49

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