Based on the traditional split-step Fourier transform (SSFT) and central-difference DM FT, an improved forward-backward difference discrete mixed Fourier transform algorithm ( DM FT) formula is presented for the problems of computation complexity and stability. The efficiency is improved and the problem of blind spot for traditional algorithm is solved under the condition of complex environment. The calculation methods of refraction profile and maximum elevation angle 0max are proposed in the horizontally inhomogeneous atmospheric environment. Compared to traditional models and experimental data, correctness and validity of the model are verified by using simulation results in the complex environment.%在分析传统分步傅立叶(SSFT)和中心差分离散混合傅立叶变换(DMFT)算法的基础上,针对算法复杂度及数值稳定性问题,提出了前向-后向混合差分DMFT算法及其具体实现步骤,提高计算效率的同时解决了传统算法在复杂条件下的盲点问题.给出了算法中水平非均匀大气折射剖面及复杂条件下最大传播仰角θmax等关键参数的计算方法,并与传统模型及经典文献实验数据进行了仿真比较,验证了该算法及模型在复杂大气条件下的正确性和有效性.
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