To attain high quality images, it is essential that very accurate motion compensation be applied to the radar returns to reduce image degradation, caused by spurious antenna center motion, to acceptable levels. A kind of high precision SINS/GPS integrated system for airborne SAR motion compensation is presented. This system, integrated the long-term stability of GPS (global positioning system) and the short-term high precision and data rate of SINS (strapdown inertial navigation system), acquires both long and short-term accuracy, in which Kalman Filter is used to damp the SINS error increasing over time by the positioning information of GPS. Simulation shows that the method can meet the requirements of 0.5meter resolution X-band SAR. Furthermore, the schema has the advantages of free of master inertial navigation system (MINS), easy implementation and feasible real-time motion compensation.
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