| 引用本文: | 赵春萌， 肖 宁， 刘 慧， 史洪印， 黎 芳. SAR三维成像中的模糊问题研究[J]. 雷达科学与技术, 2025, 23(3): 298-312.[点击复制] |
| ZHAO Chunmeng, XIAO Ning, LIU Hui, SHI Hongyin, LI Fang. Research on the Ambiguity Problem in SAR Three-Dimensional Imaging[J]. Radar Science and Technology, 2025, 23(3): 298-312.[点击复制] |
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| 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：DOI:10.3969/j.issn.1672-2337.2025.03.007 |
| 分类号:TN957.52 |
| 基金项目:国家自然科学基金青年科学基金项目（No.61501019）； 北京市教育委员会科技计划项目（No.KZ202210016021）； 北京建筑大学培育项目专项资金（No.X24031） |
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| Research on the Ambiguity Problem in SAR Three-Dimensional Imaging |
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ZHAO Chunmeng, XIAO Ning, LIU Hui, SHI Hongyin, LI Fang
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School of Electrical and Information Engineering, Beijing University of Civil Engineering and Architecture, Beijing 102616，China
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| Abstract: |
| In synthetic aperture radar （SAR） three-dimensional（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 for the problem of elevation ambiguity. The method firstly uses SAR amplitude images and coherence maps to extract buildings, obtaining the interference fringes corresponding to the building positions. 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 released from Aerospace Information Research Institute, as well as the small UAV-borne data from Tianjin Binhai Business Center, to experimentally analyze the elevation ambiguity and verify the feasibility of the defuzzification method. |
| Key words: synthetic aperture radar （SAR） 3D imaging elevation ambiguity phase wrapping multi-baseline phase unwrapping |
