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| Citation: | WANG Chao, QIU Xiaolan, LI Fangfang, et al. An InSAR image simulation and elevation inversion method for buildings[J]. Journal of Radars, 2020, 9(2): 373–385. doi: 10.12000/JR20010
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An InSAR Image Simulation and Elevation Inversion Method for Buildings
DOI: 10.12000/JR20010
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Abstract
The layover and shadow phenomenon is serious in urban areas, where the interferometric phase is complex and disordered and interpretation of an image is difficult. Therefore, it is always a hot and difficult problem for InSAR processing. SAR image simulation can provide data support for the study of image processing and understanding methods. However, most existing SAR image simulation methods for construction areas cannot obtain coherent interferometric SAR image pairs. This article proposes an InSAR simulation method for buildings. It can simulate complex images, interferograms, and the number of layover components of the construction areas. In addition, based on the analysis of the phase variation characteristics of the simulation, a reference determination method for the unwrapped phase in the layover area is proposed. It solves the problem of discontinuity of the interferometric phase in the construction areas, with which the traditional method of unwrapping cannot deal effectively. We compared the simulated results using the actual SAR images and interferometric phase and verified the correctness of our simulation method. Moreover, we carry out phase unwrapping and elevation inversion experiments using the simulated and real images and verified the effectiveness of our phase unwrapping method in applying the InSAR elevation inversion. -
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References
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- Figure 1. The simulation method for SAR image pair
- Figure 2. The simulation geometry for SAR image
- Figure 3. The projection geometry of scattering points
- Figure 4. Illustration for the number of layover contributors
- Figure 5. The angle of layover points
- Figure 6. Calculation method for the number of layover contributors
- Figure 7. InSAR measurement geometry
- Figure 8. The phase-unwrapping method guided by the layover mask
- Figure 9. Determination of the unwrapped phase reference
- Figure 10. The real SAR image pair, interferometric phase, and optical image of the two buildings
- Figure 11. 3D model for the buildings
- Figure 12. The simulation results of the buildings
- Figure 13. The pseudo-color image for the registration result of the simulated and the real images
- Figure 14. Analysis of the number of layover contributors
- Figure 15. The elevation inversion results of the simulated images using our method
- Figure 16. The elevation inversion results of the TerraSAR-X InSAR images