Abstract
It is known to all that time-domain back projection (BP) algorithm has several advantages for synthetic aperture radar (SAR) imaging[1], such as easily motion compensation for any flight track, unlimited size of the observe scene, arbitrary wide bandwidth and large integration angle. Because of the heavy computational burden of BP algorithm, many fast back projection (FBP) algorithms have proposed in recent years[2–6]. We introduce a novel fast back projection algorithm which can speed up image formation and avoid coordinates transform at the same time. This method mainly utilizes the character of subapertures' oversampling and reconstructs the bandwidth by fusing all the subbands of subapertures. It also analyses the effects and influence factors for the number of subapertures. The simulation result shows that the algorithm can efficiently reduces the computational complexity while keep the image resolution.
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