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| Citation: | Tian He, Li Daojing. Motion Compensation and 3-D Imaging Algorithm in Sparse Flight Based Airborne Array SAR[J]. Journal of Radars, 2018, 7(6): 717-729. doi: 10.12000/JR18101
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Motion Compensation and 3-D Imaging Algorithm in Sparse Flight Based Airborne Array SAR
DOI: 10.12000/JR18101
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Abstract
In this study, we adopt a criterion of Barker code to generate a high-resolution image from sparse flight samples to establish a three-dimensional (3-D) imaging model of airborne array SAR. Under the condition of motion error, we utilize the Modified Uniformly Redundant Arrays (MURA) modulation and 3-D Back Projection (BP) algorithm to obtain 3-D complex image pairs under each flight. Based on interferometry and Compressed Sensing (CS) in frequency domain, the array deformation error compensation is realized. The phases of 3-D complex image formed by the echo corresponding to negative MURA modulation are referred to perform phase compensation on each single-pass complex image to restore the image phase relation of each flight. Coherent accumulation of each complex image is implemented to realize high-resolution 3-D imaging under sparse flight sampling. Simulation analysis and experimental data verify the feasibility of the proposed method. -
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References
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- Figure 1. Geometry of airborne downward-looking 3-D imaging SAR based on sparse flight
- Figure 2. The chart of motion error in repeat-pass sampling method
- Figure 3. Code pattern and autocorrelation diagram of MURA with size of 127×127
- Figure 4. Signal processing chart of motion compensation and 3-D imaging algorithm in sparse flight based airborne array SAR
- Figure 5. The sampling plane distribution of flight path under motion error
- Figure 6. The along-track and range distribution of flight path under motion error
- Figure 7. The range offset caused by array deformation error
- Figure 8. 3-D imaging results of single flight array SAR under ideal condition
- Figure 9. 3-D imaging results with 7 flights array SAR under ideal condition
- Figure 10. 3-D imaging results of sparse flight array SAR under ideal condition
- Figure 11. Downward-looking 3-D SAR imaging results with 7 flights under motion error
- Figure 12. SAR image spectrum of single flight before/after array deforming error compensation
- Figure 13. 3-D imaging results with sparse flights under motion error compensation
- Figure 14. The observed field and testing site in microwave anechoic chamber
- Figure 15. Data extraction diagram of experimental data
- Figure 16. Experimental imaging results in microwave anechoic chamber