1 November 1993 Tomographic imaging of the ionosphere using bidirectional extrapolation algorithm
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In this paper, a new Fourier domain reconstruction algorithm is presented which utilizes the information contained in the known region of the spectrum to estimate the frequency samples in the missing-cone area. Unlike conventional two-dimensional extrapolation techniques, this method uses bi-directional extrapolation to maximize the amount of known information in each extrapolation step. By fully utilizing the information of the measured data, the resulting image provides a more accurate estimation of the electron density distribution. The resolution improvement achieved is mainly due to the proper utilization of the available information in the measurements during the image formation process.
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Helen R. Na, Helen R. Na, Hua Lee, Hua Lee, Jian Shen, Jian Shen, "Tomographic imaging of the ionosphere using bidirectional extrapolation algorithm", Proc. SPIE 2027, Advanced Signal Processing Algorithms, Architectures, and Implementations IV, (1 November 1993); doi: 10.1117/12.160467; https://doi.org/10.1117/12.160467

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