title: Global Navigational Satellite System Phase Altimetry of the Sea Level: Systematic Bias Effect Caused by Sea Surface Waves
abstract: The estimates of the Black sea level from Global Navigational Satellite Systems (GNSS) reflectometry experiments on the stationary oceanographic platform near Katsiveli, Crimea, are presented in the paper. Surface waves have been simultaneously independently registered with the wave gauge. Impact of the surface waves on the altimetry data has been investigated. For the used experimental setup, the threshold values of the surface wave height preventing the sea level measurements are estimated.