FMCW radar Continuous wave radar 4 Frequency modulation 4 Backscattering 3 Doppler effect 3 Doppler frequency 3 Finite difference method 3 Frequency-modulated-continuous-wave radars 3 Mean square error 3 Measurement function 3 Meteorological instruments 3 Multifunctional scatterometer 3 Ocean observations 3 Radar measurement 3 Range doppler 3 Range-dopple process 3 Remote sensing 3 Scatterometers 3 Sea surfaces 3 Surface waters 3 Time samples 3 Water waves 3 Wind 3 multifunctional scatterometer 3 ocean observation 3 range-doppler process 3 MIMO 2 Antennas 1 Beat signals 1 Frequency diversity 1