RASR of Nonzero Squint Spaceborne SAR Based on Ellipsoid Model
Range ambiguity signal ratio(RASR)is an important performance index of spaceborne SAR images.Compared with the zero squint SAR,the geometric relationship between the satellite and the earth in high squint SAR imaging is more complex.The assumption that the earth is regarded as a sphere in traditional RASR calculation and simu-lation will cause a large deviation in the calculation results,which will inaccurately estimate the SAR image quality.In this paper,a more accurate ellipsoid model of the earth is used to replace the sphere model,and an ambiguity region cal-culation method based on the squint antenna coordinate system is proposed.By using this method,the change of RASR along the range swath is simulated,and the spatial variability of RASR along the azimuth is also studied.The research results of this paper provide important reference value for the design of spaceborne SAR system.
high squint spaceborne SARRASRellipsoid model of the earth
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