Backscattering coefficient calibration method for satellite-borne fan-shaped beam scatterometer

The invention discloses a backscattering coefficient calibration method for a satellite-borne fan-shaped beam scatterometer, and belongs to the technical field of space microwave remote sensing. The method comprises the following steps: before data processing of a satellite-borne fan-shaped beam scatterometer, establishing a resolving unit relative visual angle and slice relative position lookup table, and establishing a resolving unit irradiation integral parameter lookup table; in a ground data processing stage, according to scene observation data at each moment, a distance-direction resolution unit power slice accumulation range and a corresponding beam center visual angle are determined based on an observation geometric lookup table, and corresponding irradiation integral parameters of each resolution unit are determined based on an irradiation integral lookup table. And calculating the backscattering coefficient of each resolution unit according to a radar equation in combination with system calibration