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摘要:
针对多输入多输出合成孔径雷达（MIMO-SAR）在近场目标散射特征诊断成像中，非正交旁瓣难以通过常规方法进行有效抑制的问题，分析了MIMO-SAR图像非正交旁瓣的产生机理，提出了基于空间变迹滤波（SVA）和三变迹处理相结合的旁瓣抑制方法。仿真和实验结果表明，本文方法不仅能很好地抑制距离向旁瓣，而且对于方位向非正交旁瓣也具有较好的抑制效果，提高了MIMO-SAR图像的二维分辨率和动态范围。
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关键词:
- 多输入多输出合成孔径雷达（MIMO-SAR） /
- 旁瓣抑制 /
- 变迹滤波 /
- 空间变迹滤波（SVA） /
- 三变迹滤波
Abstract: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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图 2 MIMO-SAR近场点目标二维点扩散函数及二维切片
Figure 2. MIMO-SAR near-field point target 2D PSF and 2D cut
图 3 距离向SVA与方位向三变迹滤波处理流程
Figure 3. Processing flow of down range SVA and cross range tri-apodization filtering
图 5 方位向切片相位校正前后结果对比
Figure 5. Comparison of cross range cut before and after phase correction
图 7 大间隔三点目标不同变迹滤波处理的结果
Figure 7. Processing results of different apodization filtering of a large-space three points target
图 8 大间隔三点目标视场中心处的二维切片
Figure 8. 2D cuts at center of filed of view at a large-space of three points target
图 9 小间隔三点目标不同变迹滤波处理的结果
Figure 9. Processing results of different apodizationfiltering of a small-space three points target
图 10 小间隔三点目标视场中心处的二维切片
Figure 10. 2D cuts at center of filed of view at asmall-space of three points target
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