Abstract
We propose the adaptive S-method-based technique for imaging of SAR and ISAR targets. This approach can be applied in the 1D and 2D modes. It is a postprocessing technique, since the first stage is the standard radar imaging with the 2D Fourier transform. In addition, selection of the adaptive parameter in this technique is efficient and can be performed based on simple rules in real time. The proposed technique produces highly concentrated (focused) radar image without interferences commonly associated with time-frequency representations and without defocusing target images that are already focused in the 2D Fourier domain.
Highlights
When radar transmits an electromagnetic signal to a target, the signal reflects from it and returns to radar
In the case of inverse synthetic aperture radar (ISAR), radar is fixed while the target is moving, while in the synthetic aperture radar (SAR) case radar is carried on an aircraft or spacecraft platform, moving at uniform speed and constant altitude [1]
We propose a technique for adaptive selection of the window width in the SM
Summary
When radar transmits an electromagnetic signal to a target, the signal reflects from it and returns to radar. Common technique for SAR and ISAR imaging is based on the 2D Fourier transform (FT). The S-method (SM), as a TF representation that can produce significant improvement in imaging of radar targets (as in the WD) without introducing cross-terms (as in the standard 2D FT technique), is proposed recently [20]. This method has a parameter that represents a window width in the frequency domain [21]. It is based on simple rules and brings major advantages: moderate calculational burden with highly concentrated radar images without interference terms.
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