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Spaceborne Synthetic Aperture Radar (SAR) has attracted special interests in many applications, but suffers from image quality degradation caused by azimuth ambiguities. To suppress this phenomenon, different from conventional suppression method, this paper concentrates on the analysis of precise mathematic expression of azimuth ambiguities. Exploiting the specific characteristic of ambiguities, a...
The spaceborne P-band synthetic aperture radar (SAR) is affected by ionospheric scintillation, which seriously impacts the imaging quality and measurements of biomass. Considering polarization modes and topographic features, a hybrid scheme for compensating ionospheric scintillation effect is proposed based on Phase Gradient Autofocus (PGA) and Faraday rotation (FR) estimation based method. Simulating...
The performance of spaceborne synthetic aperture radar (SAR) at lower frequencies, such as VHF/UHF bands, is affected by ionosphere effects, especially Faraday rotation (FR). A quantitative analysis of Faraday rotation impacts on spaceborne VHF/UHF-SAR image formation is presented in this paper. The error models of FR resulting from calm Total Electron Content (TEC) and fluctuant TEC, for Linearly...
Ionospheric irregularity sounding is of significant importance in compensating for ionospheric scintillation effects on satellite communication, navigation, and remote sensing systems at lower frequencies, i.e., L band, P band, etc. A novel spaceborne nadir-looking single input and multiple outputs synthetic aperture radar (SAR) scheme is proposed for three-dimensional (3D) sounding of ionospheric...
Ionosphere exploration is very important to improve the performance of space information systems, e.g. satellite navigation. A novel of spaceborne nadir-looking single input and multiple output (SIMO) HF-SAR is investigated, which has the capability to generate three-dimensional radar image for the topside ionospheric irregularities. The three-dimensional radar echo signal modeling is developed. The...
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