Joint observation method for sea surface wind field, sea wave and sea current

The invention belongs to the technical field of remote sensing, and particularly relates to a joint observation method for sea surface wind field, sea wave and sea current, which comprises the following steps of: 1) transmitting a group of difference frequency pulse signals to a sea surface to obtain different wavelength components of a sea wave spectrum; 2) transmitting a pulse signal to the sea surface to obtain sea surface backscattering coefficients and Doppler frequency shifts under different azimuth angles; 3) utilizing a result of the step 1) to invert and obtain sea surface sea wave spectrum information; 4) utilizing back scattering coefficient inversion to obtain sea surface wind field information; 5) estimating Doppler frequency shift caused by a sea surface wind field and sea waves based on a sea surface Doppler spectrum model according to results obtained in the step 3) and the step 4); and 6) subtracting the Doppler frequency shift caused by the movement of the satellite platform and the Doppler