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Passive remote sensing techniques have become more and more popular fordetection and characterization purposes. The advantage of using the GlobalNavigation Satellite Systems (GNSS) are the well known signals emitted and theavailability in most areas on Earth. In the present paper, L-Band signals(including GNSS signals) are considered for oceanographic purposes. The maininterest in this contribution is the analysis of the signal reflected by anevolving sea surface using time-frequency transforms. The features which occurin this domain are examined in relation to the physical phenomena: interactionof the electromagnetic waves with the moving sea surface.

Qualitative Analysis of the Time-Frequency Signature Induced by a Reflected L-Band Signal from Time Evolving Sea Surfaces