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A Super-Resolution Analysis Method for Ionospheric Scattering Function
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DOI：10.1109/LGRS.2024.3521441.png)
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Abstract
En 中文
The observation of the ionosphere is of great significance for geophysics, radio propagation mechanisms, and related engineering applications. In response to the low range and Doppler resolution of the scattering function map obtained by traditional ionosonde with fewer coherent soundings, this letter proposes a super-resolution analysis method. By utilizing the coherence between the frequency components of the echo signal and using phase weighted summation, the super-resolution synthesis in the range dimension was achieved. In the frequency dimension, the Capon spectral super-resolution estimation method was employed. In this way, super-resolution is achieved both along the range and Doppler axis of the scattering function map simultaneously. It breaks the limitations of spatial and temporal sampling rates on observation resolution. Simulation and experiment results have verified the performance of this method. With a tenfold increase in resolution, it achieves the distinction of multilayer echo traces and the identifies their subtle Doppler difference. This method provides a favorable means for efficient and accurate detection of the ionosphere.
Keywords:
Superresolution
Doppler effect
Signal resolution
Scattering
Ionosphere
Bandwidth
Energy resolution
Spatial resolution
Imaging
Estimation
Doppler spectrum estimation
ionospheric accurate detection
range dimensional signal synthesis
super-resolution
Journal
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16.4
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