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电离层ＣＴ技术由于数据采集系统结构的局限性，致使所得数据不完全，伪投影中采样不均匀，频域谱值不完全．若用直接Ｆｏｕｒｉｅｒ方法重建，必须对伪投影采样施以均匀化和在二维频域内进行估值．本文参照已有的Ｆｏｕｒｉｅｒ外推技术，提出小波外推技术．理论分析和重建结果都说明小波外推技术具有较多优越性．
Ionospheric CT technology due to the limitations of the data acquisition system structure, resulting in incomplete data obtained, pseudo-projection sampling uneven, incomplete frequency spectrum values. If direct Fourier reconstruction is used, the pseudo-projection samples must be homogenized and evaluated in the two-dimensional frequency domain. This paper refers to the existing Fourier extrapolation technique and proposes the wavelet extrapolation technique. Theoretical analysis and reconstruction results show that wavelet extrapolation has more advantages.