Research on the methods of inner calibration of spaceborne SAR

The inner calibration technology of spaceborne SAR, as an effective way of eliminating the error deduced from inaccurate SAR positioning parameters to improve positioning accuracy, has been studied worldwide. Based on the imaging characteristics of spaceborne SAR and its rigorous sensor model, this paper constructs the rigorous geometric model for SAR inner calibration, and then proposes the inner calibrating algorithm. CRS1 images over Inner Mongol are used as test data. The positioning accuracy of the model is improved a lot after inner calibration which verifies the feasibility and accuracy of the algorithm.