研究目的
Investigating the impact of different axial ratios on a pair of SAR images over the Indian subcontinent to estimate scintillation and ionospheric parameters and comparing these parameters with ground-based measurements to determine the precise size of irregularity structure.
研究成果
The study demonstrates that an axial ratio of 60:1 is suitable for estimating scintillation and ionospheric parameters from SAR data in the equatorial region. The findings highlight the importance of accurate axial ratio assumption in scintillation studies and suggest less variability in S4 and CkL calculations for axial ratios beyond 50:1.
研究不足
The study assumes weak scattering conditions, which may not provide accurate results when S4 exceeds about 0.6. The accuracy of S4 estimates depends on the homogeneity of the terrain and unchanged radar backscatter in disturbed and undisturbed images.
1：Experimental Design and Method Selection:
The study compares the impact of different axial ratios on SAR images to estimate scintillation and ionospheric parameters. Two methods for estimating the amplitude scintillation index, S4, are used: S4 from radar cross-section (RCS) enhancement and S4 from image contrast.
2：Sample Selection and Data Sources:
The dataset includes SAR images acquired by ALOS-2/PALSAR-2 on two dates and ground-based GPS data from SCINDA stations at Tirunelveli and Rajkot.
3：List of Experimental Equipment and Materials:
ALOS-2/PALSAR-2 SAR system, GPS receivers at Tirunelveli and Rajkot stations.
4：Experimental Procedures and Operational Workflow:
The study involves calculating S4 and CkL for SAR images using different axial ratios, comparing these with GPS-derived S4 values to validate the axial ratio assumption.
5：Data Analysis Methods:
The study uses weak scattering theory and Born approximation for converting S4 to CkL, considering the anisotropy factor and axial ratio.
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