Agence Spatiale Europeenne

Pablo Colmenarejo Matellano

Giulio Ruffini

Manuel Martin Neira

A method for performing Earth altimetry comprising the steps of: receiving by an upward-looking antenna onboard a platform above the Earth surface, direct signals having at least two different carrier frequencies transmitted by GNSS satellites in view of the upward-looking antenna, receiving by a downward-looking antenna onboard the platform signals reflected by the Earth surface and having the at least two different carrier frequencies, comparing carrier phases of the direct signals and received reflected signals, at the carrier frequencies, and determining from the phase comparisons a surface height.

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Madrid, Spain

Pablo Colmenarejo Matellano