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The paper presents a new method to estimate the spaceborne SAR Doppler frequency rate. A polynomial model is set up to demonstrate the azimuth signal of the spaceborne SAR and converts frequency rate estimation to frequency estimation through difference processing. With the analysis of estimation accuracy and computational complexity, the method is proved to be able to reduce the burden of computation while the estimation accuracy is guaranteed. Finally, several simulations and processing of RADARSAT raw data are presented, which proves the validity of the proposed method.

A method on reducing speckle in high resolution single-look synthetic aperture radar (SAR) images is put forward in this paper. Based on soft-morphology, the method is called soft-morphological filter with omnidirectional multiple structuring elements. It substitutes omni-directional multiple structuring elements for common structuring elements. Using it, point targets are detected and preserved and single-look SAR images with high spatial resolution and high radiometric resolution can be obtained. Its efficiency is testified with SAR raw data.