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| Citation: | HU Xiaoning, WANG Bingnan, XIANG Maosheng, et al. InSAR elevation inversion method based on backprojection model with external DEM[J]. Journal of Radars, 2021, 10(3): 391–401. doi: 10.12000/JR20144
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InSAR Elevation Inversion Method Based on Backprojection Model with External DEM
DOI: 10.12000/JR20144 CSTR: 32380.14.JR20144
More Information-
Abstract
When Interferometric Synthetic Aperture Radar (InSAR) is used to obtain the Digital Elevation Model (DEM), highly sloped terrains will make interferometric fringes dense and increase the difficulty of phase unwrapping, which will affect the accuracy of phase unwrapping and elevation inversion. To solve this problem, an InSAR elevation inversion method based on BackProjection (BP) model with an external DEM is proposed. This model achieves imaging and InSAR DEM inversion in a uniform BP geographic space and introduces an external DEM as auxiliary information. These processes, in turn, can remove most phases of the terrain and reduce the density of interferometric fringes and phase wrapping. Additionally, the proposed method can avoid the procedures of image registration and phase unwrapping in most cases, which simplifies traditional InSAR processing and achieves high processing accuracy. A simulation experiment and X-band InSAR data processing were performed to verify the effectiveness of the proposed method.-
Keywords:
- Elevation inversion,
- InSAR,
- External DEM,
- BackProjection (BP) algorithm,
- SAR
-
References
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LIU Yuzhou, CAI Tianyi, LI Yachao, et al. A range and azimuth combined two-dimensional NCS algorithm for spaceborne-missile bistatic forward-looking SAR[J]. Journal of Radars, 2023, 12(6): 1202–1214. doi: 10.12000/JR23144
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- Figure 1. The interferometric model based on BP imaging algorithm
- Figure 2. Geometric description of the height of ambiguity
- Figure 3. InSAR processing chain
- Figure 4. Simulation results
- Figure 5. The elevation inversion errors of two methods
- Figure 6. The focused images of intense scatterer
- Figure 7. Airborne InSAR data processing results
- Figure 8. Airborne InSAR data processing results of mountainous area