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| Citation: | WANG Yan, KANG Lihong, LIU Jie, et al. Spaceborne SAR non-along-track imaging mode: Opportunities and challenges[J]. Journal of Radars, 2022, 11(6): 1131–1145. doi: 10.12000/JR22083
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Spaceborne SAR Non-Along-Track Imaging Mode: Opportunities and Challenges
doi: 10.12000/JR22083
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Abstract
Spaceborne Synthetic Aperture Radar (SAR) can achieve various performance combinations of resolution and observation bandwidth by adjusting the working modes. The imaging swath of the traditional spaceborne SAR working mode is along the satellite orbit, and the geographical trend is single; however, the geographical shape and direction of the surface scene are diverse and generally do not match the imaging swath along the orbit, resulting in a long data acquisition period, low azimuth resolution, and storage waste of computing resources. To this end, the spaceborne SAR Non-along-track imaging mode is a new method for spaceborne SAR scene matching that is characterized by an imaging zone that is no longer mechanically along the satellite orbit but is generated according to the actual geographical direction of the scene to achieve “customization” that matches the scene imaging. In this paper, the main opportunities and challenges faced by the new mode of spaceborne SAR scene matching are discussed from the aspects of information acquisition and imaging processing, and the principled verification of the spaceborne SAR Non-along-track imaging mode is provided through a computer simulation. -
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References
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- Figure 1. Comparison between along-track and non-along-track modes
- Figure 2. Curved swath of the spaceborne SAR non-along-track imaging mode
- Figure 3. Comparisons of different modes covering coastlines
- Figure 4. Spaceborne SAR non-along-track sub-modes
- Figure 5. Spaceborne SAR non-along-track sub-stripmap mode with straight swath
- Figure 6. The variation of azimuth resolution and range swath with respect to observation squint angle α (θ = 30°)
- Figure 7. The variation of azimuth resolution and range swath w.r.t. scene squint angle θ (α= 30°)
- Figure 8. Relative positions between transmitting and receiving pulses
- Figure 9. Failure constant-PRF design caused by severe time-varying slant range in non-along-track mode
- Figure 10. Multi-segment PRF sequence and the corresponding influence on imaging
- Figure 11. Continuously varying pulse interval sequence and the corresponding influence on imaging
- Figure 12. Spatial variance of range cell migration in non-along-track mode imaging
- Figure 13. Time-domain algorithm for spaceborne SAR non-along-track mode
- Figure 14. Spatial variance of range cell migration and range phase of non-along-track imaging mode
- Figure 15. Spatial variance of the parameters in nonlinear chirp scaling algorithms
- Figure 16. Simulated observation region and target distribution
- Figure 17. Time-varying parameters of observation geometry
- Figure 18. Continuously varying PRF sequence of simulation
- Figure 19. Time-varying curves of RASR, AASR and NESZ
- Figure 20. Point spread functions of focused targets