Space-borne antenna beam center calibration method based on directional diagram matching

The invention discloses a space-borne antenna beam center calibration method based on directional diagram matching. The space-borne antenna beam center calibration method comprises the following steps: (1) N ground calibrators are arrayed; (2) the receiving power of the N ground calibrators is obtained; (3) through satellite-ground geometrical judgment, whether a main lobe covers an area at the moment or not is judged; (4) the receiving power of the N ground calibrators is aligned, the power of a certain specific pulse is subjected to spatial sampling, and meanwhile space attenuation introduced due to the distance difference of different calibration stations is compensated; (5) whether the pointing directions of beams of the N ground calibrators are consistent or not is judged; and (6) thepointing directions of the beams are estimated, meanwhile the cost function is obtained, whether the matching result is correct or not is judged according to the cost function, if yes, the cost valueis output, and if not, th