| 基于斜距高阶近似的弧形阵列SAR成像方法 |
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| 引用本文： | 杜欣,黄平平,徐伟,谭维贤,高志奇,张振华.基于斜距高阶近似的弧形阵列SAR成像方法[J].信号处理,2019,35(5):809-815. |
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| 作者姓名： | 杜欣 黄平平 徐伟 谭维贤 高志奇 张振华 |
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| 作者单位： | 内蒙古自治区雷达技术与应用重点实验室 |
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| 基金项目： | 内蒙古自然科学基金杰青项目(2017JQ10)；内蒙古自然科学基金面上项目(2016MS0606); 国家自然科学基金青年基金项目(61761037);内蒙古自治区科技创新引导项目(KCBJ2017)
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| 摘 要： | 弧形阵列合成孔径雷达(Synthetic Aperture Radar, SAR)是一种新型的针对广域观测的阵列成像雷达，其具有观测范围广，分辨率高等特点。由于其回波信号方位向等角度间隔采样，目标精确的二维频 谱难以有效推导，并且已有的线性阵列成像算法不再适用。针对上述问题，本文提出了一种基于斜距高阶近似的弧形阵列SAR成像处理方法，该方法首先对斜距模型进行高阶近似，然后推导了雷达回波信号的二维频谱，之后在二维频域补偿距离徙动及距离方位的耦合，最终得到聚焦图像。点阵目标的仿真结果验证了该成像方法的有效性。
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| 关 键 词： | 弧形阵列SAR 广域观测 成像方法 高阶近似 二维频域 |
| 收稿时间： | 2019-01-03 |
Imaging Approach for Arc Array SAR Based on High-Order Approximation of Slant Range |
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| Affiliation: | College of Information Engineering, Inner Mongolia University of TechnologyInner Mongolia Key Laboratory of Radar Technology and Application |
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| Abstract: | Arc array synthetic aperture radar (SAR) is a novel array imaging system for wide-area observation. It has a wide range of observations and high resolution. Due to the characteristics of azimuth sampling at equal angular intervals, it is difficult to derive the two-dimension spectrum of the target echo signal, and existing imaging algorithms of linear array are no longer applicable. As for above issues, a new arc array SAR imaging processing method based on high-order approximation of slant range is presented. The method performs high-order approximation for the range model, obtains the two-dimensional spectrum of the target echo signal through series reversion, and then compensates the range migration and the coupling of distance and azimuth in the two-dimensional frequency domain. Finally, obtains the focused image. Simulation analysis of the point targets validates the effectiveness of the imaging approach. |
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