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Aperture synthesis technique is a feasible means to provide high spatial resolution at low frequencies. But due to the impacts of system errors, time varying scenes, and different inversion algorithms, analytic studies of system performances are difficult or impossible, and the need of numerical simulation appears. In this paper, a signal-level simulator is presented. It covers brightness temperature...
In order to deal with the inverse problem in aperture synthesis radiometers (ASRs) imaging, some deterministic inversion algorithms are proposed. However, these inversion algorithms are deficient in utilizing the statistical properties of visibility samples and reconstructed image. In this paper, the probability density functions of visibility samples and pixels of reconstructed image are investigated...
The system imperfections have great influence on the performance of aperture synthesis radiometers (ASRs). An improved spatial impulse-response matrix (G matrix) is presented for error calibration of ASRs. Most receiver errors except for the baseline fringe-washing error can be eliminated with the improved G matrix in the image reconstruction of ASR without need for complex hardware calibration system...
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