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| Titel |
Simulation of space-borne tsunami detection using GNSS-Reflectometry applied to tsunamis in the Indian Ocean |
| VerfasserIn |
R. Stosius, G. Beyerle, A. Helm, A. Hoechner, J. Wickert |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 10, no. 6 ; Nr. 10, no. 6 (2010-06-25), S.1359-1372 |
| Datensatznummer |
250008241
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| Publikation (Nr.) |
 copernicus.org/nhess-10-1359-2010.pdf |
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| Zusammenfassung |
| Within the German-Indonesian Tsunami Early Warning System project GITEWS
(Rudloff et al., 2009), a feasibility study on a future tsunami detection system
from space has been carried out. The Global Navigation Satellite System
Reflectometry (GNSS-R) is an innovative way of using reflected GNSS
signals for remote sensing, e.g. sea surface altimetry. In contrast to
conventional satellite radar altimetry, multiple height measurements within a
wide field of view can be made simultaneously. With a dedicated Low Earth
Orbit (LEO) constellation of satellites equipped with GNSS-R, densely
spaced sea surface height measurements could be established to detect
tsunamis. This simulation study compares the Walker and the meshed comb
constellation with respect to their global reflection point distribution. The
detection performance of various LEO constellation scenarios with GPS,
GLONASS and Galileo as signal sources is investigated. The study concentrates
on the detection performance for six historic tsunami events in the Indian
Ocean generated by earthquakes of different magnitudes, as well as on
different constellation types and orbit parameters. The GNSS-R carrier
phase is compared with the PARIS or code altimetry approach. The study shows
that Walker constellations have a much better reflection point distribution
compared to the meshed comb constellation. Considering simulation assumptions
and assuming technical feasibility it can be demonstrated that strong
tsunamis with magnitudes (M) ≥8.5 can be detected with certainty
from any orbit altitude within 15–25 min by a 48/8 or 81/9 Walker
constellation if tsunami waves of 20 cm or higher can be detected by
space-borne GNSS-R. The carrier phase approach outperforms the PARIS
altimetry approach especially at low orbit altitudes and for a low number of
LEO satellites. |
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