| Mexico 草帽小波与电离层CT反演 |
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| 引用本文： | 许正文,吴健,曹冲.Mexico 草帽小波与电离层CT反演[J].电波科学学报,1999,14(3):308-312. |
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| 作者姓名： | 许正文 吴健 曹冲 |
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| 作者单位： | 中国电波传播研究所青岛分所,青岛,266071 |
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| 摘 要： | 电离层ＣＴ技术中由于数据采集系统的几何结构存在局限性，致使探测所得数据不导致其成为不完全数据重建问题。投影中的采样点不均匀，且由投影谱通过Ｆｏｕｒｉｅｒ中心切片原理组合而得的二维谱平面不完全可知，若要用变换方法重建成象，需要对其进行估计。
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| 关 键 词： | 重建 小波外推方法 Mexico草帽小波 |
Mexico hat wavelet and reconstruction of computerized ionospheric tomography |
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| XU Zheng-wen,WU Jian,CAO Chong.Mexico hat wavelet and reconstruction of computerized ionospheric tomography[J].Chinese Journal of Radio Science,1999,14(3):308-312. |
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| Authors: | XU Zheng-wen WU Jian CAO Chong |
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| Abstract: | In the technique of computerized ionospheric tomography, incomplete data is received because of limits in its data acquisition system geometry.So the reconstruction belongs to incomplete data reconstruction(limited angle tomography)in this case.Samples in projections are nonuniform, and two dimensional spectra plane obtained from projections spectra by using Fourier central slice theorem is not known completely. If the transform method for reconstruction will be used to reconstruct image,unknown spectra must be estimated.In this paper,the wavelet extrapolation method for estimate is used.The choice of wavelet function is various, the familiar Mexico hat wavelet is used in extrapolation.Deduction and simulation are also given. |
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| Keywords: | Reconstruction Wavelet extrapolation method Mexico hat wavelet |
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