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Utilizing ocean reflected GPS L1 C/A and the new GPS L2C signals for Tsunami Detection from space: Possible small satellite constellations and the GORS instrument

Helm, Achim and Stosius, Ralf and Montenbruck, Oliver and Yudanov, Sergey and Beyerle, Georg and Rothacher, Markus (2008) Utilizing ocean reflected GPS L1 C/A and the new GPS L2C signals for Tsunami Detection from space: Possible small satellite constellations and the GORS instrument. International Conference on Tsunami Warning (ICTW), 2008-11-12 - 2008-11-14, Bali (Indonesia).

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Abstract

Within the German Indonesian Tsunami Early Warning System (GITEWS) project concept studies and new technology developments using Global Navigation Satellite System (GNSS) reflectometry and scatterometry have been initiated. Thes techniques use ocean reflected GNSS signals for tsunami detection from space. With modified multi-frequency GNSS receivers onboard a satellite densely spaced grids of sea surface heights with decimeter accuracy could be established fairly rapidly. Simulation studies analyze various scenarios of low earth orbit (LEO) satellite constellations with respect to tsunami detection time and show that only a large number of LEO satellites can monitor the sea surface with sufficient high resolution in space and time. The studies assume optimum signal reception. Such a LEO constellation could be realized by small and affordable satellites, equipped with GNSS instrumentation based on the use of commercial off-the-shelf (COTS) rather than dedicated expensive space receivers. Within GITEWS the new generation JAVAD GNSS receivers are adapted and extended for such advanced space applications. The GNSS occultation, reflectometry and scatterometry (GORS) space receiver prototype uses a modified firmware that allows for open-loop tracking of reflected GPS signals. As major step forward compared to current space receivers GORS supports tracking of the civil GPS L2C signal. Signal simulator tests show that the prototype provides proper GPS measurements for orbit determination and scientific applications under LEO signal dynamics. A ground-based experiment evaluates the extended functionality of the GORS receiver and illustrates the proof-of-concept of a GPS reflectometry measurement for two frequencies. Water level observations of Lake Walchen could be remotely obtained by carrier-phase delay with cm-level accuracy. Furthermore, the receiver is able to record reflected GPS signal waveforms.

Document Type:Conference or Workshop Item (Paper)
Title:Utilizing ocean reflected GPS L1 C/A and the new GPS L2C signals for Tsunami Detection from space: Possible small satellite constellations and the GORS instrument
Authors:
AuthorsInstitution or Email of Authors
Helm, AchimGFZ
Stosius, RalfGFZ
Montenbruck, OliverUNSPECIFIED
Yudanov, SergeyJAVAD GNSS
Beyerle, GeorgGFZ
Rothacher, MarkusGFZ
Date:November 2008
Status:Published
Keywords:Tsunami, GPS Reflectometry, L2C signal, GORS
Event Title: International Conference on Tsunami Warning (ICTW)
Event Location:Bali (Indonesia)
Event Type:international Conference
Event Dates:2008-11-12 - 2008-11-14
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignement
DLR - Research area:Space
DLR - Program:W SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):W -- no assignement (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Space Operations and Astronaut Training
Deposited By: Dr.rer.nat.hab. Oliver Montenbruck
Deposited On:22 Jan 2009
Last Modified:27 Apr 2009 15:44

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