李爽,王栋,王立程,等. 基于机载多角度InSAR技术的复杂地形高精度DEM重建方法[J]. 信号处理,2024,40(3): 460-470. DOI: 10.16798/j.issn.1003-0530.2024.03.005.
引用本文: 李爽,王栋,王立程,等. 基于机载多角度InSAR技术的复杂地形高精度DEM重建方法[J]. 信号处理,2024,40(3): 460-470. DOI: 10.16798/j.issn.1003-0530.2024.03.005.
‍LI Shuang,WANG Dong,WANG Licheng,et al. High precision DEM generation of complex terrain based on airborne multi-angle InSAR[J]. Journal of Signal Processing,2024,40(3):460-470. DOI: 10.16798/j.issn.1003-0530.2024.03.005.
Citation: ‍LI Shuang,WANG Dong,WANG Licheng,et al. High precision DEM generation of complex terrain based on airborne multi-angle InSAR[J]. Journal of Signal Processing,2024,40(3):460-470. DOI: 10.16798/j.issn.1003-0530.2024.03.005.

基于机载多角度InSAR技术的复杂地形高精度DEM重建方法

High Precision DEM Generation of Complex Terrain Based on Airborne Multi-angle InSAR

  • 摘要: 干涉合成孔径雷达(Interferomtric Synthetic Aperture Radar,InSAR)是全天时、全天候获取三维地表信息重要的技术手段。机载InSAR系统具有机动灵活、多角度获取数据的优势,可以高效率、高精度获取数字高程模型(Digital Elevation Model,DEM)数据。但是,在地形复杂区域,InSAR侧视成像易在地形陡峭区域形成较大范围的阴影和严重的叠掩现象,阴影和叠掩区域在SAR图像上体现为信息的丢失,从而导致DEM数据大面积无效数据的存在,严重影响DEM数据的质量及应用。针对这一问题,本文提出了基于机载多角度InSAR技术的复杂地形高精度DEM重建方法,基于考虑地形起伏的机载多角度InSAR数据获取任务规划设计,最大程度的避免阴影和叠掩导致的无效数据;基于高精度InSAR数据处理,保证每个角度DEM数据精度的高度一致性;基于快速多角度DSM数据融合与滤波处理,实现多角度InSAR体制复杂地形DEM高精度重建。本文以四川省西部山区大坡度、非连续等复杂地形为例,基于本文提出的方法,利用3个角度InSAR数据融合处理,生成了高精度DEM数据,试验结果表明,本文提出的方法获取复杂地形DEM数据高程均方根误差为0.6 m,同时,数据有效率大于99%。

     

    Abstract: ‍ ‍In remote sensing, InSAR is a powerful technology for the generation of DEM with high accuracy and better resolution, permitting us to minitor the earth surface topography in all weather and at all times. Airborne InSAR system offers the advantages of variable track and multi-angle to collect InSAR data, enabling the efficient and precise acquisition of DEM. However, in areas with complex terrain, InSAR side-looking imaging tends to create extensive shadows and layover in steep terrain areas. These shadows and overlays manifest as information loss in SAR images, leading to invalid data in DEM. The invalid data severely impacts the quality and applicability of DEM data. To address this issue, this paper proposes a method for high-precision DEM generation of complex terrains based on airborne multi-angle InSAR. The task planning for multi-angle InSAR data acquisition that accounts for topography features is used to minimize invalid data caused by shadows and overlays. The high-precision InSAR data processing is used to ensure high consistency in DEM data accuracy from each angle. The rapid multi-angle DSM data fusion and filtering processing is used to achieve high-precision reconstruction of complex terrain DEMs under multi-angle InSAR configurations. Using the steep, discontinuous, and complex terrain of the western mountainous area of Sichuan Province as an example, this paper demonstrates the generation of high-precision DEM data through the fusion of InSAR data from three angles. The experimental result shows that the method proposed in this paper achieves DEM data with validity rate exceeding 99%.

     

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