The use of GPS buoys in the determination of oceanic variables

GPS observables taken from light-weight GPS buoys more than 80 km from the GPS reference stations have been analysed using different noise models in t he parameter estimation process. The time series solution of the GPS buoy p ositioning have been used to extract values of oceanic variables (sea level , tides and waves) and tropospheric information. These variables are compar ed with data from models and with measurements from a meteorological buoy.