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Spotlight synthetic aperture radar (SAR) can obtain high resolution SAR image but the observation area is restricted. This paper presents a new imaging mode named jumping spotlight SAR to achieve high resolution and wide swath simultaneously. In jumping spotlight mode, high resolution SAR image is acquired by antenna beams steering, and meanwhile the wide observation swath is realized through antenna...
Compressed sensing (CS) theory can be applied to SAR imaging to achieve super-resolution images. To elaborate SAR imaging performance based on CS theory, this paper analyzes the characteristics of signal and discusses resolution from macroscopic and microcosmic aspects. And the factors which affect SAR super-resolution performance are discussed. On this basis, two important conclusions on the reconstruction...
As the existing technology is not ideal, saturation of radar receiver is inevitable. Receiver saturation will reconstruct the original echo signal and cause the target strength distortion and false targets. This paper established a nonlinear mathematical model of simplified saturation. The signal phase and amplitude errors are obtained by using quadrature demodulation. Then we analyzed the effects...
The range ambiguity of the spaceborne synthetic aperture radar (SAR) is serious, because of the wide swath and the large detection range. This also decreases the radar image quality. Increasing the antenna height can solve this problem. But usually the satellite platform can not load the large antenna. So the range ambiguity suppression is an important problem for the spaceborne SAR. In this paper,...
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