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A New Combination Technique for Improving Slant Resolution in Constellation SAR System

Across-track resolution of spaceborne SAR system is limited by power and data rate constraints. In the constellation SAR system, multi-receiver can simultaneously receive echoes of the same ground scene from different off-nadir angles and across-track resolution can be improved by recovering a larger band of the spectrum. In the traditional methods, the unavoidable estimation errors will deteriorate the effectiveness of combination. In this paper, an auto-combination algorithm is introduced to combine sub-images into an improved across-track resolution image and the algorithm is image quality measured based. Simulated data show that the algorithm is effective and robust.