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| Citation: | LU Jiaguo, TAO Li, ZHONG Xuelian, et al. The L-band airborne repeat-pass interferometric SAR system and its experimental study[J]. Journal of Radars, 2019, 8(6): 804–819. doi: 10.12000/JR19078
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L-band Airborne Repeat-pass Interferometric SAR System and Its Experimental Study
DOI: 10.12000/JR19078
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Abstract
This paper describes the L-band airborne Synthetic Aperture Radar (SAR) system and an experimental study of repeat-pass SAR interferometry. The discussions mainly focus on the internal calibration method, the imaging method based on Differential Global Positioning System/Inertial Measurement Unit (DGPS/IMU) data, Residual Motion Error (RME) estimation and compensation, and the Digital Elevation Model (DEM) inversion method with Interferometric SAR (InSAR). Two typical test areas were chosen from the acquired SAR data for detailed analyses. The DEMs in these two areas were inversed with repeat-pass InSAR, and comparisons with the measured ground points show errors in these two areas with a standard deviation 3.40 m and 2.85 m, respectively. This demonstrates the good performance of this L-band repeat-pass interferometric SAR system. These results have important significance for the design of airborne repeat-pass InSAR systems and typical terrain mapping. When the flight tracks are under good control, this L-band SAR system is applicable in the fields of differential InSAR, polarimetric InSAR, and tomographic SAR. -
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References
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- Figure 1. L-band SAR system for airborne repeat-pass interferometry
- Figure 2. Internal calibration loop of the SAR system
- Figure 3. Route planning for the SAR campaign
- Figure 4. Corner reflectors deployed in the calibrating area
- Figure 5. Flight tracks for the repeat-pass interferometric campaign
- Figure 6. The repeat-pass flight tracks for the test areas (partial)
- Figure 7. The amplitude image of HH polarization for the first test area
- Figure 8. The amplitude image of HH polarization for the second test area
- Figure 9. The spectrum amplitude and phase errors of the chirp signal for the L-band SAR system
- Figure 10. The focused point image before amplitude and phase compensation
- Figure 11. The focused point image after amplitude and phase compensation
- Figure 12. The imaging diagram for airborne repeat-pass interferometric SAR
- Figure 13. The imaging results for the corner reflectors
- Figure 14. The principle diagram of MS when coregistration error exists between the master and slave images
- Figure 15. The observation geometry for airborne repeat-pass interferometric SAR
- Figure 16. Data processing steps for interferometric SAR
- Figure 17. The displacement between the actual and referenced tracks for the first test area
- Figure 18. The coherence and interferometry map for the first test area
- Figure 19. The coherence plot for the test area
- Figure 20. The high-order residual motion errors derived from the interferometric fringes with MS
- Figure 21. The interferometry map before and after RME compensation for the first test area (after flat-earth removing)
- Figure 22. The derived DEM after RME compensation
- Figure 23. The DEM difference map before and after RME compensation
- Figure 24. The coherence for the second test area
- Figure 25. The high-order RME derived from the interferometric fringes with MS
- Figure 26. The interferometry map before and after RME compensation for the second test area (after phase unwrapping)
- Figure 27. 3-dimentinal display of the derived DEM for the second test area