Method for iteratively calculating center moment of satellite-borne slip SAR scene and satellite-borne synthetic aperture radar

• Main Authors: QIAN FANGMING, LI SHUO, GE SHIQI, WANG JUNRUI, WANG DING, LIU AIFANG, HOU YUSHENG
• Format: Patent
• Language: Chinese; English
• Published: 30.07.2024
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; CALCULATING; COMPUTING; COUNTING; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; ELECTRIC DIGITAL DATA PROCESSING; HOROLOGY; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; RADIO-CONTROLLED TIME-PIECES; TESTING

The invention relates to the technical field of spaceborne microwave imaging radars, in particular to a method for iteratively calculating the center moment of a spaceborne sliding aggregation SAR scene and a spaceborne synthetic aperture radar. The method comprises the following steps: receiving a slip SAR center moment initial value calculated by using coarse precision orbit data on the ground; collecting orbit forecast data broadcasted by an inter-satellite measurement subsystem in real time; according to a distance Doppler relation of a satellite-borne SAR, under the condition that a satellite effectively implements yaw guidance, when a normalized vector inner product crosses a zero point, the normalized vector inner product crosses the zero point is just the moment when a center beam irradiates a target in a sliding bunching mode, and the zero crossing point moment is accurately obtained through least square interpolation and iteration according to the principle. The method has the advantages of being go