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With the increasing demands for higher resolution and wider swath in many applications of Synthetic Aperture Radar (SAR), sliding spotlight mode has been presented. Here the antenna pattern is steered towards a fixed point to increase the synthetic aperture length and consequently in a better resolution. Currently, the image processing algorithms for sliding spotlight mode are almost based on the...
The polar format algorithm (PFA) is a classic algorithm for processing spotlight synthetic aperture radar (SAR) data and is extensively used in practical applications nowadays, mainly because its well performance in processing highly squinted data. Based on the chirp Z-Transform (CZT), PFA can be implemented accurately without any interpolation in the broadside case; however, for the squint mode case,...
Geosynchronous orbit synthetic aperture radar (GEO-SAR) has a good application prospect for its shorter repeat period and a wider swath compared to low Earth orbit SAR. Doppler characteristic of the echo is analyzed. The Doppler history varies frequently in space and approximates a high order signal. A back projection algorithm for high resolution GEO-SAR based on satellite-ground geometry model is...
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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