The invention discloses a phase-scanning and mechanism-scanning combined airspace searching method based on a
spaceborne radar. The method comprises the following steps of: (1) generating a searching wave beam with a fixed shape on an
azimuth plane and first initiating the searching direction of an
antenna array plane toward an
azimuth dimension; (2) carrying out pitching dimension searching wave beam by using a pitching dimension-dimension
phased array on the
antenna array plane, and implementing pitching dimension airspace searching on a sine space by using characteristics of a
phased array antenna wave beam; (3) rotating the
antenna array plane to the position of a next
azimuth angle; and (4) judging whether an azimuth dimension wave
beam direction angle is rotated to a maximum searching azimuth angle direction or not and whether the pitching dimension airspace searching is finished or not; and if so, finishing the searching; and otherwise, carrying out the searching processes of the step (2) and the step (3) in a repeated way. According to the invention, an airspace searching method with different complementary and mixed searching methods as well as combined phase-scanning and mechanism-scanning of the
spaceborne radar is achieved; and the phase-scanning and mechanism-scanning combined airspace searching method based on the
spaceborne radar, disclosed by the invention, has the advantages of high searching speed, short target capturing time, uneasiness for losing targets, good
impact shock resistance, less T / R units and suitability for being used on spaceborne platforms with finite resources.