GNSS-R Delay-Doppler Map Simulation Based on the 2004 Sumatra-Andaman Tsunami Event

Abstract EN

A new method for simulatingGlobal Navigation Satellite System-Reflectometry (GNSS-R)delay-Doppler maps (DDMs) of a tsunami-dominant sea surfaceis presented.

In this method, the bistatic scattering Z-V model,the sea surface mean square slope model of Cox and Munk,and the tsunami-induced wind perturbation model are employed.

The feasibility of the Cox and Munk model under a tsunamiscenario is examined by comparing the Cox and Munk modelbased scattering coefficient with the Jason-1 measurement.

Agood consistency between these two results is obtained with acorrelation coefficient of 0.93.

After confirming the applicability of the Cox and Munk model for a tsunami-dominated sea,this study provides the simulations of the scattering coefficientdistribution and the corresponding DDMs of a fixed region ofinterest before and during the tsunami.

In the final analysis, bysubtracting the simulation results that are free of tsunami fromthose with presence of tsunami, the tsunami-induced variationsin scattering coefficients and DDMs can be clearly observed.

Asa result, the tsunami passage can be readily interpreted.