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The Solar Polar Orbit Telescope (SPORT) mission is proposed to observe the origination and propagation of the interplanetary coronal mass ejections (ICMEs), monitor its long-term behavior and forecast the near earth space weather. A time shared synthetic aperture interferometric radiometer with clock scan is chosen as the main payload instrument to fulfill the objectives. In this paper, the preliminary...
Recently, a new concept of rotation scanning synthetic aperture interferometric radiometer (RS-SAIR) has been receiving more and more attentions for its advantage of much simpler configuration with looser requirements of antenna elements. In this article, we investigate the imaging theory of RS-SAIR, and introduce the pseudo-polar FFT algorithm to deal with the polar u-v samples. It only involves...
The 2D mathematical model of a highly adaptive sensor for use in electrical impedance tomography (EIT) is established. Based on the model, the optimized parameters of the sensor are obtained. Reconstructed images are presented to illustrate the effectiveness of the model using Tikhonov regularization methods based on the sensitivity theorem. The quality of reconstructed images is high in both size...
This paper presents an adaptive multigrid method used in both the forward and inverse problems. The proposed method combines adaptive mesh and multigrid solution strategy to resolve the forward problem. The accuracy and efficiency of the former forward solver are improved by incorporating the above two procedures. For image reconstruction the regularized Gauss-Newton method combined with adaptive...
A 2D mathematical model of a new sensor configuration in electrical impedance tomography (EIT) system is developed. The model is established with consideration for the reformation of the interested region caused by the placement of the arc-shaped electrodes. The concept of the 'virtual' point electrode is introduced. The model is suitable for two-port measurement in an EIT system. Experimental data...
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