| 摘要: |
| SAR三维成像中，基线分布对成像结果有很大的影响。最长基线决定成像系统的分辨率，最短基线决定了成像系统的最大不模糊高度。本文分析了基线分布对三维成像的影响，并针对高程模糊问题，提出了一种基于相位解缠技术的解模糊方法。该方法首先利用SAR幅度图像和相干系数图实现建筑提取，获得建筑位置所对应的干涉条纹；然后利用多基线迭代相位解缠方法获得最长基线的对应的高分辨率真实相位图；最后，对长基线的干涉相位反演高程得到解模糊的高程点云。本文分别利用仿真实验和来自空天信息创新研究院发布的运城机载数据以及天津临港商务大厦小型无人机载数据，对高程模糊进行了实验分析，也验证了解模糊方法的可行性。 |
| 关键词: 合成孔径雷达 三维成像 高程模糊 相位缠绕 多基线相位解缠 |
| DOI： |
| 分类号:TN957.52 |
| 基金项目:国家自然青年科学基金项目(61501019) |
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| The Research of SAR Three-Dimensional Imaging Ambiguity Problem |
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肖宁, 刘慧, 史洪印, 黎芳
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| Abstract: |
| In SAR 3D imaging, the distribution of the baseline has a significant impact on the imaging results. The longest baseline determines the resolution of the imaging system, while the shortest baseline determines the maximum unambiguous height of the imaging system. This paper analyzes the impact of baseline distribution on 3D imaging and proposes a defuzzification method based on phase unwrapping technology to address the problem of elevation ambiguity. The method first uses SAR amplitude images and coherence maps to extract buildings, obtaining the interference fringes corresponding to the building locations. Then, a multi-baseline iterative phase unwrapping method is used to obtain the high-resolution true phase map corresponding to the longest baseline. Finally, the unambiguous elevation point cloud is obtained by inversely propagating the interferometric phase of the longest baseline. This paper uses simulation experiments and airborne data from Yuncheng published by the Aerospace Information Innovation Institute, as well as small UAV-borne data from the Tianjin Binhai Business Center, to experimentally analyze elevation ambiguity and verify the feasibility of the defuzzification method. |
| Key words: SAR 3D-imaging Elevation ambiguity Phase wrapping Multi-baseline phase unwrapping |