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In the Fast Factorized Back Projection Algorithm [1], the 2D interpolation in the image domain is an essential procedure to obtain a fine resolution image which is achieved point by point. The computational burden is intensive [2]. This paper presents a modified FFBPA for the spotlight SAR imaging. In this algorithm, the coarse sub-images obtained by back projecting the sub-aperture signals to the...
In this paper, an interpolation-free fast factorized back-projection (IF-FFBP) algorithm is proposed for high-resolution spotlight synthetic aperture radar (SAR) processing. Different from the original FFBP utilizing two-dimensional image-domain interpolation for sub-aperture fusion, IF-FFBP finishes the image merging steps using chirp-z transform and circular shifting. Under the restriction of the...
Narrow angle approximation and isotropic assumption adopted in regular radar imaging are violated in wide angle radar imaging scenario. Therefore, conventional Fourier based methods are not directly applicable, and full aperture algorithms perform poor under low SNR. This paper proposes an imaging scheme based on Sparsity Enhanced Non-negative Matrix Factorization (SENMF). The full aperture is firstly...
For highly squinted synthetic aperture radar (SAR) imaging, the wavenumber domain SAR processing algorithm is commonly accepted as an ideal solution to SAR focusing in the case of an ideal straight sensor trajectory. However, airborne SAR is very sensitive to atmospheric turbulence that causes serious trajectory deviations. In this paper, we propose a robust autofocusing approach for highly squinted...
Aiming at airborne three-channel SAR-GMTI system and its real data, a novel channel equalization method is presented, furthermore, in virtue of the method's good performance on compensating the clutter differences between different channels, a technique for moving target detection (MTD) and location is further proposed. This method first realizes signal equalization between inner channels utilizing...
To achieve wide-swath and full azimuth resolution in space-borne synthetic aperture radar (SAR), a space-borne radar usually utilizes low pulse repetition frequency (PRF) with a small aperture in azimuth. Consequently, the azimuth ambiguities are inevitable. As one solution to this problem, space domain filter can be utilized to remove the azimuth ambiguities based on the configuration of micro-satellites...
Due to the presence of atmospheric turbulences, airborne SAR raw data may be affected by deviations of the platform from an ideal straight line. Additionally, being rather expensive, the inertial navigation system (IMS) and the global position system (GPS) do not always provide desired accuracy and reliability. This paper presents a solution for aircraft motion error extraction from radar raw data...
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