基于自适应高程约束的TomoSAR三维成像

任子帅; 张照; 高雨欣; 郭睿

doi:10.12000/JR23111

基于自适应高程约束的TomoSAR三维成像

DOI: 10.12000/JR23111

任子帅¹,
张照¹,
高雨欣²,
郭睿^1, ,

1.
西北工业大学自动化学院西安 710129
2.
西北工业大学电子信息学院西安 710129

基金项目: 国家自然基金(42104039, 61971326)，陕西省自然科学基础计划项目(2023-JC-QN-0370)

详细信息

作者简介:
任子帅，硕士生，主要研究方向为层析合成孔径雷达三维成像及点云处理

张　照，硕士，主要研究方向为合成孔径雷达干涉测量及层析成像

高雨欣，硕士生，主要研究方向为合成孔径雷达三维成像及雷达定标

郭　睿，博士，副教授，主要研究方向为雷达遥感技术及应用、激光探测技术等

通讯作者:
郭睿 gr2003@nwpu.edu.cn

责任主编：廖明生 Corresponding Editor: LIAO Mingsheng
中图分类号: TN95
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出版历程
- 收稿日期: 2023-06-21
- 修回日期: 2023-08-03
- 网络出版日期: 2023-09-01
- 刊出日期: 2023-10-28

Three-dimensional Imaging of Tomographic SAR Based on Adaptive Elevation Constraint

1.
School of Automation, Northwestern Polytechnical University, Xi’an 710129, China
2.
School of Electronics and Information, Northwestern Polytechnical University, Xi’an 710129, China

Funds: The National Natural Science Foundation of China (42104039, 61971326), Natural Science Basic Research Program of Shaanxi (2023-JC-QN-0370)

More Information

Corresponding author: GUO Rui, gr2003@nwpu.edu.cn

摘要

摘要: 层析合成孔径雷达成像(TomoSAR)是2010年以来SAR成像领域尤其是城市三维成像的热门研究方向。但在TomoSAR三维重建中，相位缠绕会引起高程散射剖面的周期性谱峰，并导致散射体高程向位置的错误估计和三维成像结果中建筑点云的分层，即高程模糊。该文针对这一现象，提出一种自适应调整高程搜索范围的方法，以提升散射体高程估计的准确度，并改善高程模糊。该方法首先进行场景的高度预估计，然后根据高度预估计构建高程采样中心线性函数并计算搜索半径，从而确定并更新各像素的高程搜索范围，保留真实谱峰并隔离模糊峰值。机载和星载的实测数据实验表明所提方法明显改善了高程模糊和伪影问题，提高了三维点云的空间集中度和连续性。
- 层析合成孔径雷达成像(TomoSAR) /
- 相位缠绕 /
- 高程模糊 /
- 散射体 /
- 高程搜索范围
Abstract: Synthetic Aperture Radar Tomography (TomoSAR) has emerged as a hot research topic in the field of SAR imaging, particularly for three-dimensional (3D) urban imaging in recent years. However, in TomoSAR 3D reconstruction, due to the phase unwrapping difficulty, periodic spectral peaks appear in the reconstruction results of the reflectivity profile along the elevation. This results in errors in estimating the elevation locations of the scatterers and causing layering effects in 3D imaging results, which is the elevation ambiguity. In light of this phenomenon observed in TomoSAR, a method for the adaptive adjustment of the elevation search range is proposed to improve the accuracy of the elevation estimation and reduce elevation ambiguity. In this method, the height of the scene is first estimated, the linear function of the elevation sampling center is subsequently constructed based on the height pre-estimations, and the search radius is finally calculated. Thereafter, the elevation search range of each pixel in the SAR image is determined and updated, preserving the true spectral peaks while isolating the ambiguity peaks. The experimental results for airborne and spaceborne measured data demonstrate that the proposed method significantly improves elevation ambiguity and artifacts-related issues while also improving the spatial concentration and continuity of 3D point clouds.
- TomoSAR /
- Phase unwrapping /
- Elevation ambiguity /
- Scatterers /
- Elevation sample range

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图 1 TomoSAR三维成像几何模型

Figure 1. TomoSAR 3D geometric model

下载: 全尺寸图片幻灯片

图 2 高程向的伪目标示意图

Figure 2. Pseudo target in the elevation

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图 3 仿真数据1的高程散射剖面反演结果

Figure 3. Reconstruction results of elevation reflectivity profile of the first simulation data

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图 4 仿真数据2的高程散射剖面反演结果

Figure 4. Reconstruction results of elevation reflectivity profile of the second simulation data

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图 5 自适应高程搜索范围方法流程图

Figure 5. The flowchart of adaptive elevation search range method (blue: The boundary before constraints; red: Boundaries after constraints; yellow: Elevation sampling center)

下载: 全尺寸图片幻灯片

图 6 峨眉区域的Google Earth光学图和SAR幅度图

Figure 6. Google Earth optical map and SAR amplitude map of Emei area

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图 7 峨眉数据的三维重建结果

Figure 7. 3D reconstruction results of Emei data

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图 8 峨眉数据的散射剖面反演结果

Figure 8. Inversion results of scattering profile from Emei data

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图 9 不同高度估计下的平均邻域高度差和散射体完整度

Figure 9. $\Delta {h_{\text{E}}}$ and C at different height estimation

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图 10 巴塞罗那区域的Google Earth光学图和SAR幅度图

Figure 10. Google Earth optical map and SAR amplitude map of Barcelona area

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图 11 巴塞罗那数据的三维重建结果

Figure 11. 3D reconstruction results of Barcelona data

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图 12 所选像素的CS高程稀疏反演

Figure 12. Sparse inversion on elevation by CS of the selected pixel

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表 1 仿真实验1参数

Table 1. Experimental parameters for the first simulation data

参数	数值	参数	数值
通道数	11	波长	0.02 m
基线跨度	1 m	下视角	45°
最小基线间隔	0.1 m	高程模糊间隔	100 m
斜距	1000 m	高程瑞利分辨率	10 m

下载: 导出CSV

表 2 仿真实验2参数

Table 2. Experimental parameters for the second simulation data

参数	数值	参数	数值
航过数	11	波长	0.03 m
基线跨度	450 m	下视角	45°
最小基线间隔	21 m	最大不模糊高程	428.6 m
斜距	600 km	高程瑞利分辨率	20 m

下载: 导出CSV

表 3 峨眉数据参数

Table 3. Parameters of Emei data

参数	数值
载波频率	14.5 GHz
最小基线间隔	0.1115 m
最大基线长度	1.1274 m
载机航线海拔	2157 m
场景海拔	420 m
中心斜距	2040.1 m
中心下视角	31.6°
距离向像素尺寸	0.1362 m
方位向像素尺寸	0.1051 m

下载: 导出CSV

表 4 峨眉数据的平均邻域高度差(m)

Table 4. $\Delta {{\boldsymbol{h}}_{\bf{E}}}$ of Emei data (m)

未采用自适应高程搜索范围$\Delta {h_{\text{E}}}$	采用自适应高程搜索范围$\Delta {h_{\text{E}}}$
12.6512	7.5453

下载: 导出CSV

表 5 巴塞罗那数据参数

Table 5. Parameters of Barcelona data

参数	数值
载波频率	9.65 GHz
最小基线间隔	7.98 m
最大基线长度	246.4 m
中心斜距	621.6 km
中心下视角	35.7°
距离向像素尺寸	0.91 m
方位向像素尺寸	1.88 m

下载: 导出CSV

表 6 巴塞罗那数据的平均邻域高度差(m)

Table 6. $\Delta {{\boldsymbol{h}}_{\mathbf{E}}}$ of Barcelona data (m)

未采用自适应高程搜索范围$\Delta {h_{\text{E}}}$	采用自适应高程搜索范围$\Delta {h_{\text{E}}}$
22.5561	14.3084

下载: 导出CSV

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