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| Citation: | QIU Xiaolan, JIAO Zekun, YANG Zhenli, et al. Key technology and preliminary progress of microwave vision 3D SAR experimental system[J]. Journal of Radars, 2022, 11(1): 1–19. doi: 10.12000/JR22027
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Key Technology and Preliminary Progress of Microwave Vision 3D SAR Experimental System
DOI: 10.12000/JR22027
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Abstract
Three-Dimensional (3D) Synthetic Aperture Radar (SAR) imaging has considerable application potential in steep-terrain mapping and target recognition in complex environments and is an important development direction in the current SAR field. To promote the development and application of the 3D SAR imaging technology, the Aerospace Information Research Institute, Chinese Academy of Sciences designed and developed an unmanned aerial vehicle-borne Microwave-Vision 3D SAR (MV3DSAR) experimental system, which provides an experimental platform for the research and verification of related technologies. Currently, the single-polarization version of the system has been developed, and the first flight experiment has been conducted in Tianjin. This study introduces the structure, performance, key technologies, and data processing of the system. This study also presents the implementation and preliminary data processing results of the first experiment, verifying the basic performance and 3D imaging capability of the system. The MV3DSAR provides a good experimental and verification platform for analyzing 3D SAR imaging algorithms and constructing 3D SAR imaging datasets. -
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References
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- Figure 1. Schematic illustration and a photo of MV3DSAR payload
- Figure 2. MV3DSAR system photo
- Figure 3. Laboratory measurements of phase difference between channels
- Figure 4. Optical image of Tianjin Lingang Business Building
- Figure 5. Baseline design of MV3DSAR flight experiment
- Figure 6. Cross-correlation properties of observation matrix and spatial ambiguity function curve
- Figure 7. Maximum unblurred height and Rayleigh resolution
- Figure 8. MV3DSAR flight path design
- Figure 9. Schematic illustration and photos of the calibrators
- Figure 10. Results of Lidar point cloud
- Figure 11. Optical oblique photography results
- Figure 12. The overall flow of MV3DSAR data processing
- Figure 13. Difference between actual flight path and reference track
- Figure 14. Variation curve of attitude measurement data with time
- Figure 15. Schematic diagram of the relative position of the antenna phase center
- Figure 16. Luneburg-Lens reflector and trihedral corner reflector point target curve
- Figure 17. Imaging results of Lingang Business Building in eight directions
- Figure 18. Variation curve of slope distance error with distance direction
- Figure 19. The relationship between the phase error of the receiving channels and the slant range
- Figure 20. The relationship between phase error of the transmit channels and the slant range
- Figure 21. Deviation of phase error between transmit channels and the fitted straight line
- Figure 22. The statistical curve of coherence coefficient
- Figure 23. Coherence coefficient map
- Figure 24. Interferometric phase diagram after removing flat-ground phase
- Figure 25. Segmentation results of building geometry in SAR image
- Figure 26. Comparison of results before and after 3D point cloud deblurring
- Figure 27. 3D reconstruction results of Lingang Business Building
- Figure 28. SAR 3D reconstruction results and Lidar point cloud of Lingang Business Building