| Citation: | XU Guangyao, LIU Yongze, XU Xiaojianet al. Enhanced resolution in MIMO-SAR imaging using apodization[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(7): 1313-1320. doi: 10.13700/j.bh.1001-5965.2016.0514(in Chinese)
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When the conventional methods of sidelobe suppression are used in multiple input multiple output synthetic aperture radar (MIMO-SAR) systems to generate images for diagnosing the near field scattering features of targets, non-orthogonal sidelobes can hardly be suppressed efficiently. In this paper, based on the generation mechanisms of the non-orthogonal sidelobes in near filed, an approach which combines spatially variant apodization (SVA) with tri-apodization was proposed to suppress the non-orthogonal sidelobes for MIMO-SAR images. Simulation and experimental results demonstrate that the sidelobes in down range as well as the non-orthogonal sidelobes in cross range are suppressed efficiently via the proposed approach. As a consequence, for MIMO-SAR images, the resolutions in both the down range and the cross range are improved remarkably while a higher dynamic range can be achieved.
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