Abstract:
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In recent years GNSS-R has been proposed for ocean remote
sensing, both for altimetry and scatterometry. For the later,
two main approaches are available: fitting the measurements
with a model, or using some observable from the measurements
(either the waveform or the delay-Doppler Map) to be
directly linked to ocean surface’s roughness. For groundbased
and airborne experiments, several direct observables
have been proposed to describe ocean surface’s roughness,
and they have been used assuming that the observation geometry
had little impact on them. However, it may not be
true for a spaceborne scenario, since the dynamics are higher.
In this work an extensive simulation study is performed, and
the first results on how the observation geometry does impact
different GNSS-R direct observables is presented. |