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Concept Design of Space-Borne Radars for Tsunami Detection

Galletti, Michele und Krieger, Gerhard und Marquart, Nicolas und Börner, Thomas und Schulz-Stellenfleth, Johannes und Zink, Manfred (2007) Concept Design of Space-Borne Radars for Tsunami Detection. In: International Geohazards Week. International Geohazards Week, 2007-11-05 - 2007-11-09, Frascati, Italien.

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Offizielle URL: http://earth.esa.int/workshops/2007Geohazards/

Kurzfassung

After the 2004 Boxing Day tsunami, the Ministry of Education and Research of Germany (BMBF) sponsored the GITEWS project (German Indonesian Tsunami Early Warning System), aiming at implementing an operational and effective life-saving system for Indonesia and possibly other littoral countries of the Indian Ocean. The German Aerospace Agency (DLR) is one of the many international institutions involved in the project and the Microwave and Radar Institute (DLR-HR) is committed to the development of new radar-based concepts for tsunami detection. NESTRAD, (NEar-Space Tsunami Radar) consists of a real aperture phased array radar nested inside a stratospheric airship meant to provide early warning from earthquake or landslide-generated tsunamis. It relies on three principles of detection and three corresponding operating modes, namely Altimeter Mode, Doppler Mode and Scatterometer Mode. The first mode detects relative changes in sea surface height, the second detects tsunami-induced orbital velocities, while the third detects tsunami-induced radar cross section modulations. The novelty of the concept resides however in the sensor platform. For early-warning purposes and high Doppler accuracy, continuous monitoring and therefore a stationary platform is needed. Space geostationary orbits lie very far away, at about 37000 km from the earth surface, but stratospheric geostationary platforms are being developed both in Germany (Zeppelin Luftshifftechnik GmbH) and the US (HAA, High Altitude Airship by Lockheed Martin). These are unmanned, lighter-than-air vehicles located right above the jet stream at 20 km altitude meant to provide a new and unique near-space, geostationary platform. The phased-array antenna is accommodated inside the blimp and allows for monitoring of relatively a large area. How large is the patch of ocean surface that can actually be monitored is relevant to the success of the system and is dependent on the principle of detection offered by the sensor. Besides illustrating the three principles of detection available, we will outline some system specifications, present performance prediction calculations and consider the peculiar constraints given by using airships as radar platforms. An advantage point of this concept is that, being tsunamis relatively rare events, it is desirable for such a sensor to be useful also for other purposes. Indeed, such a system could well be designed as a multi-purpose sensor, for example for weather or ocean monitoring as well as surveillance and reconnaissance purposes.

Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Concept Design of Space-Borne Radars for Tsunami Detection
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Galletti, MicheleNICHT SPEZIFIZIERT
Krieger, GerhardNICHT SPEZIFIZIERT
Marquart, NicolasNICHT SPEZIFIZIERT
Börner, ThomasNICHT SPEZIFIZIERT
Schulz-Stellenfleth, JohannesNICHT SPEZIFIZIERT
Zink, ManfredNICHT SPEZIFIZIERT
Datum:November 2007
Erschienen in:International Geohazards Week
Referierte Publikation:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Tsunami, Airships, Early Warning, Radar, Near Space
Veranstaltungstitel:International Geohazards Week
Veranstaltungsort:Frascati, Italien
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2007-11-05 - 2007-11-09
Veranstalter :ESA ESRIN
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 > Mikrowellen-Systeme
Institut für Hochfrequenztechnik und Radarsysteme
Institut für Hochfrequenztechnik und Radarsysteme > Satelliten-SAR-Systeme
Hinterlegt von: Michele Galletti
Hinterlegt am:21 Dez 2007
Letzte Änderung:12 Dez 2013 20:28

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