Fig. 1. FFT-based phase screen generation method.
Fig. 2. Modified von Karman spatial power spectrum and the sampling of this spectrum in the FFT method.
Fig. 3. Concept diagram of the subharmonic method.
Fig. 4. Flow diagram of the subharmonic method.
Fig. 5. Flow diagram of the covariance matrix method.
Fig. 6. (a) Phase screen generated by using FFT method. (b) Phase screen generated by using subharmonic method. (c) Phase screen generated by using covariance matrix method.
Fig. 7. (a) Structure function of phase screens generated by using FFT method. (b) Structure function of phase screen at r = 1 m and simulation time as a function of the size of phase screen when the FFT method is used.
Fig. 8. (a) Structure function of phase screens generated by using subharmonic method. (b) Structure function of phase screen at r = 1 m and simulation time as a function of the size of Nsub when the subharmonic method is used.
Fig. 9. (a) Structure function of phase screens generated by using covariance matrix method. (b) Structure function of phase screen at r = 1 m and simulation time as a function of the size of Nlow when the covariance matrix method is used.
Table 1. Parameters used for the generation of phase screens
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