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Master Thesis

Suivi de l’humidité des sols par l’analyse des signaux GNSS

Abstract : Since its appearance in the 1990’s, Global Navigation Satellite System and more precisely the American system GPS (Global Positioning System) have known huge expansions. Nowadays, such developments enable this technology to provide new applications going for beyond positioning. GPS measurements realized on a field in the south of France (near Tarascon) with a dedicated station has shown a significant correlation between soil moisture and reflected GPS signals. During their propagation, GNSS waves are affected in a number of ways. Catching GPS signal at low elevations promotes multipath effect on the soil near the antenna. Signal-to-Noise-Ratio (SNR) modeling at low elevations with a sinusoid wave form allows to determine two parameters: amplitude A and phase offset ψ. The analysis of these two parameters during a period of two months show a correlation between soil moisture and GPS signals. With this method, we can easily detect rain events and we find a good correlation with soil moisture variations.
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Master Thesis
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Submitted on : Wednesday, July 22, 2015 - 2:44:57 PM
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Benoît Presset. Suivi de l’humidité des sols par l’analyse des signaux GNSS. Sciences de l'ingénieur [physics]. 2014. ⟨dumas-01179438⟩

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