  GNSS-R signals contain a coherent and an incoherent component. A new
algorithm for coherent phase altimetry over rough ocean surfaces, called
PARFAIT, has been developed and implemented in Starlab's STARLIGHT GNSS-R
software package. In this paper we report our extraction and analysis of the
coherent component of L1 GPS-R signals collected during the ESTEC Bridge 2
experimental campaign using this technique. The altimetric results have been
compared with a GPS-buoy calibrated tide model with a resulting precision of
the order 1 cm.
