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| Citation: | Li Liang, Hong Jun, Ming Feng. Mechanism Study of Ionospheric Effects on Medium-Earth-Orbit SAR[J]. Journal of Radars, 2017, 6(6): 619-629. doi: 10.12000/JR17016
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Mechanism Study of Ionospheric Effects on Medium-Earth-Orbit SAR
DOI: 10.12000/JR17016
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Abstract
The Medium-Earth-Orbit SAR (MEOSAR) is one of the potential spaceborne SAR of next-generation owing to its excellent performance. Ionospheric effects analysis is one of the critical techniques for the development of MEOSAR. The spatio-temporal variability of the ionosphere is analyzed using the measured ionosphere data. The factors and the mechanism of ionospheric effects on MEOSAR are studied based on the spatio-temporal variability of the ionosphere and the characteristics of MEOSAR such as long synthetic aperture time, wide swath, and high orbit. The results reveal that there are many differences in the ionospheric effects between MEOSAR and LEOSAR.
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References
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- Figure 1. Global ionospheric TEC distribution[7]
- Figure 2. TEC vs. longitude
- Figure 3. TEC vs. latitude
- Figure 4. TEC vs. longitude and latitude
- Figure 5. Ionospheric TEC variation in a day (South California Area)
- Figure 6. Ionospheric VTEC vs. time (different latitude)
- Figure 7. Ionospheric VTEC vs. time (different longitude)
- Figure 8. Sketch of range beam on ionosphere for MEO/LEO SAR
- Figure 9. Peak quadratic phase error induced by residual TEC after correction for various orbit
- Figure 10. Propagation geometry of a signal propagating in ionosphere
- Figure 11. Sketch of SAR pulses propagating through ionosphere twice
- Figure 12. Degradation of resolution in range induced by irregularities vs. SAR orbit height
- Figure 13. Sketch of range beam on ionospheric irregularity for MEO/LEO SAR
- Figure 14. Image geometry for MEO and LEO SAR
- Figure 15. Projection on ionosphere of synthetic aperture for MEO and LEO SAR
- Figure 16. Effects on azimuth image induced by temporal-variability of ionosphere
- Figure 17. Displacement in azimuth vs. orbit height
- Figure 18. Phase variance induced by ionospheric irregularity vs. orbit height