Abstract
Spaceborne synthetic aperture radar (SAR) polarimetric application, operating at P-band, is significantly influenced by ionospheric Faraday rotation (FR). Various researches have been published to evaluate the FR effect on polarimetric scattering matrix, nevertheless all of which are based on the narrow-band hypothesis and ignore the polarimetric dispersion (PD) effect caused by FR for its high disturbance within the bandwidth. The existent model is no longer well applicable to the future P-band ultra-wideband system with benefits of the high-resolution detection of the subsurface or obscured targets. A novel analytical model of PD based on the frequency-domain range pulse compression is proposed and analysed in this Letter, and the simulation results indicate the spaceborne P-band ultra-wideband SAR system is seriously influenced by the PD effect.
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