https://scholars.lib.ntu.edu.tw/handle/123456789/633634
標題: | Equidistant Sub-Nyquist 3-D Microwave Imaging Using Rational Thin-Plate Spline Interpolation | 作者: | Lin, Ting Yang Yang, Hsin Jung SHIH-YUAN CHEN |
關鍵字: | microwave imaging | rational thin-plate spline (RTPS) interpolation | sub-Nyquist | 公開日期: | 1-一月-2023 | 來源出版物: | 17th European Conference on Antennas and Propagation, EuCAP 2023 | 摘要: | High sampling rates required by the Nyquist sampling theorem impose limitations on both rapid data acquisition and measurement system design in planar microwave holographic imaging, rendering sub-Nyquist sampling a desirable feature. Compared to the incoherence requirement in compressed-sensing-based methods, equidistant sampling schemes are favorable for a more general and intuitive system design. In this paper, a 3D microwave imaging scheme using equidistant sub-Nyquist samples is proposed. The method is based on the open-circuit voltage formulation in [1], but the reconstruction with sub-Nyquist data is done using the rational thin-plate spline (RTPS) interpolation. Determination of the interpolation function involves finding an eigenvector with the smallest eigenvalue to a generalized eigenproblem. A remedy procedure is also developed to address the singularities or outliers produced by the ill-conditioning in such a problem. The effectiveness and robustness of the developed method are verified with numerical experiments in X-band, showing significant improvements in image quality. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/633634 | ISBN: | 9788831299077 | DOI: | 10.23919/EuCAP57121.2023.10133440 |
顯示於: | 電機工程學系 |
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