Atmosphere turbulence MTF models in moderate-to-strong anisotropic turbulence

In this study, based on the extended Rytov approximation theory and the modified anisotropic non-Kolmogorov turbulence refractive-index fluctuations spectrum, new analytic expressions of the atmospheric turbulence modulation transfer function (MTF) are derived for optical plane and spherical waves propagating through moderate-to-strong anisotropic non-Kolmogorov turbulence. The anisotropic factor which parameterizes the asymmetric turbulence cells or eddies in the horizontal and vertical directions is introduced. When the anisotropic factor equals one, the models derived in this work can reduce correctly to the previously published results in moderate-to-strong isotropic turbulence. In addition, a wide range of turbulence strengths (weak, moderate-to-strong, and strong turbulence) is considered in this work, and it has good consistency with the previous models which were developed in weak anisotropic non-Kolmogorov turbulence in the weak turbulence regime.