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| Citation: | LIN Yuqing, QIU Xiaolan, PENG Lingxiao, et al. Non-line-of-sight target relocation by multipath model in SAR 3D urban area imaging[J]. Journal of Radars, 2024, 13(4): 777–790. doi: 10.12000/JR24057
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Non-line-of-sight Target Relocation by Multipath Model in SAR 3D Urban Area Imaging
DOI: 10.12000/JR24057
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Abstract
The advancement in the miniaturization technology of Synthetic Aperture Radar (SAR) systems and SAR three-dimensional (3D) imaging has enabled the 3D imaging of urban areas through Unmanned Aerial Vehicle (UAV)-borne array Interferometric SAR (array-InSAR), offering significant utility in urban cartography, complex environment reconstruction, and related domains. Despite the challenges posed by multipath signals in urban scene imaging, these signals serve as a crucial asset for imaging hidden targets in Non-Line-of-Sight (NLOS) areas. Hence, this paper studies NLOS targets in UAV-borne array-InSAR 3D imaging at low altitudes and establishes a multipath model for 3D imaging at low altitudes. Then, a calculation method is proposed for obtaining the multipath reachable range in urban canyon areas based on building plane fitting. Finally, a relocation method for NLOS targets is presented. The simulation and real data experiments of UAV-borne array-InSAR show that the proposed method can effectively obtain 3D images and relocate NLOS targets in urban canyon areas, with errors typically below 0.5 m, which realizes the acquisition of hidden NLOS region information.-
Keywords:
- Array-InSAR,
- 3D imaging,
- Non-Line-of-Sight (NLOS),
- Multipath,
- UAV-borne SAR
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References
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- Figure 1. Schematic diagram of the NLOS scene in an urban scenario
- Figure 2. Flowchart of NLOS target relocation in array-InSAR 3D imaging
- Figure 3. Array-InSAR imaging model for urban scene
- Figure 4. Schematic diagram of the NLOS range in urban scenarios
- Figure 5. Flowchart for calculating the NLOS multipath reachable area
- Figure 6. Schematic of simulation and real data experiment parameters
- Figure 7. 3D point cloud of the urban canyon in simulation experiment
- Figure 8. Comparison of 3D point cloud for single NLOS target simulation experiment
- Figure 9. Comparison of 3D point cloud for multiple NLOS target simulation experiment
- Figure 10. Illustration of the MV3DSAR system and experimental scenarios
- Figure 11. SAR imaging results of Lingang Business Building
- Figure 12. Comparison of the SAR 3D imaging point clouds in Tianjin
- Figure 13. Comparison of the top view of the SAR 3D imaging point clouds in Tianjin
- Figure 14. Placement of multipath reflectors and experimental scene of the east-west flight in Suzhou
- Figure 15. Optical image of Suzhou experiment and the corresponding 2D results
- Figure 16. Multipath diagram of east-west flight in Suzhou
- Figure 17. SAR 3D imaging results of east-west flights in Suzhou