The Key Techniques For Spaceborne ScanSAR Radiometric Correction

Spaceborne ScanSAR mode is an important direction in spaceborne SAR development, which causes new problems for radiometric correction. The key techniques for spaceborne ScanSAR radiometric correction are studied in this paper.The basic principle of spaceborne ScanSAR are studied, which be regarded as the base for the research of spaceborne ScanSAR radiometric correction. The error sources in ScanSAR system are analyzed and the main problems in this paper about spaceborne ScanSAR radiometric correction are confirmed.Scalloping effect and beam boundary problem are studied with emphasis. The mechanisms of scalloping effect is analyzed by building the mathematic models. The scalloping effect correction techniques used in conventional processor are summarized, a new method is put forward. This method is proved to be more accurate and effective by simulation. The relationship between banding error and roll error is analysed using data averaging method, which can improve the correction accuracy of banding. The beam boundary banding correction techniques used in conventional processor are summarized, a more accurate and effective method is put forward. The effect of terrain on ScanSAR radiometric correction is studied based on the wide swath of ScanSAR.The framework of spaceborne ScanSAR radiometric correction is built by the analysis of the techniques studied above. We developed a computer software system to simulate the ScanSAR radiometric error and correctionmethods. This system can be as a tool for design the project of the spaceborne ScanSAR radiometric correction based on point target method.