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In this paper, an improved wavenumber domain imaging algorithm is proposed for circular synthetic aperture (CSAR) data taken in stripmap mode. The proposed algorithm allows to reconstruct an image on a cylindrical surface. The range trajectory is approximated with the fourth-order terms expansion and the echo signal is transformed to the wavenumber domain by using a principle of stationary phase....
In order to develop bistatic SAR ocean investigation, the first issue is the study of bistatic SAR ocean surface imaging mechanism. And velocity bunching mechanism is a SAR inherent modulation. Thus, the intensity expression in the bistatic SAR image plane is derived in this paper. The expression describes quantificationally the displacement of the scatter elements in the image plane and a degradation...
Detection of distributed targets such as internal wave or ship wake on sea surface in Synthetic Aperture Radar (SAR) images is an important application of ocean microwave remote sensing. The chaotic characteristic of sea clutter gives some clues to targets detection on sea surface. Speckle, the inherent noise of SAR image, will affect the predictive accuracy of sea clutter adversely and reduce the...
Recently, as the rapid growing use of dual polarization spaceborne SAR data for ship detection, it seems necessary in practice for us to find a favorable detection algorithm, however, which is still scarce in literatures. In this paper, based on the application of the whitening filter, we proposed to design a dual polarization CFAR (Constant False Alarms Rate) detection method for ship detection,...
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