Doppler frequency width acquisition method of airborne radar main lobe clutter region

The invention discloses a Doppler frequency width acquisition method for a main lobe clutter region of an airborne radar. The method comprises the following steps: S1, acquiring a velocity vector V = (Vx, Vy, Vz) under a plane coordinate system of an aircraft body; s2, acquiring an antenna main lobe beam center vector b under a plane coordinate system of the aircraft body; s3, acquiring Doppler frequency fd0 corresponding to the antenna main lobe beam center according to the velocity vector V and the antenna main lobe beam center vector b under the plane coordinate system of the aircraft body; and S4, the Doppler frequency fdk of a point K in an antenna main lobe clutter region where the antenna main lobe beam is hit to the ground under the airframe coordinate system is obtained, the Doppler frequency width of the main lobe clutter region is fdkmax-fdkmin, and fdkmax and fdkmin are the maximum value and the minimum value of fdk respectively. According to the method, the Doppler frequency corresponding to the