Research on influencing factors and compensation methods of the azimuth cutoffwavelength based on multiview synthetic aperture radar wave synchronizationdata

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Abstract
Due to the nonlinear effect of velocity bunching modulation, azimuth cutoff occurs when waves are propagating along the azimuth direction. This is an inherent disadvantage of synthetic aperture radar (SAR) wave observation and makes it impossible to obtain complete wave information. For a single SAR observation, the problem of the azimuth cutoff wavelength of ocean waves can be solved to some extent by the cooperative observations of SAR satellites. It is necessary to use multiple SAR satellites to achieve simultaneous observation of the same ocean area to obtain multiview SAR ocean wave synchronization data. At present, it is impossible to acquire multiview synchronization data based on in-orbit SARs. Therefore, this paper first carried out imaging simulations of multiview SAR ocean wave synchronization data. Second, the MPI method was used to obtain the optimum wave spectrum of synchronous data. The influencing factors of the azimuth cutoff wavelength were analyzed by using the measured SAR data. Based on the analysis results, a new method of multiview wave spectrum data fusion is proposed to realize azimuth cutoff compensation. The azimuth cutoff compensation effect is evaluated by using the inversion results of the azimuth cutoff before and after spectral data fusion, the significant wave height and the mean wave period. The results show that the azimuth cutoff compensation method established in this paper can solve the problem of information loss caused by azimuth cutoff to some extent, improve the ability of SAR wave observation, and lay a foundation for SAR wave operational observation.

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