A Phase Screen Simulation Method for Atmospheric Turbulence Based on Spectral Inversion Method
A technology of atmospheric turbulence and phase screen, applied in the field of meteorology, can solve the problems of insufficient accuracy and achieve the effect of improving accuracy, suitable for popularization and application, and low computational complexity
Active Publication Date: 2022-04-12
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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[0004] From the above studies, it can be seen that the feasibility and effectiveness of the numerical simulation method of atmospheric turbulent phase screen simulation are beyond doubt, but there are still some gaps between the simulation results obtained by these methods and the theoretical values, and the accuracy is slightly insufficient
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[0069] 1. Use figure 1 The Kolmogorov phase power spectral density Φ shown in the solid line φ (f).
[0070] 2. Set the atmospheric coherence length r 0 =0.1m, the two-dimensional space size G of the x direction and y direction of the phase screen x =G y = 2m, the number of sampling points N in each direction x =N y =512, then the corresponding frequency sampling interval is Δf x =Δf y =1 / G x =0.5m -1 , for the two-dimensional phase power spectral density Φ φ (f) Perform uniform sampling to obtain the high frequency part φ of the phase screen HF (m,n).
[0071] 3. Set the harmonic order N p = 1, sub-harmonic resampling is performed in the low-frequency region, and the low-frequency part φ of the phase screen is obtained LF (m,n).
[0072] 4. Add the high-frequency part and low-frequency part of the phase screen to get the final turbulent phase screen φ(m,n), such as Figure 4 shown.
[0073] 5. Set different harmonic order N p , comparing the structure functio...
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An atmospheric turbulence phase screen simulation method based on a spectrum inversion method, the method first selects an atmospheric turbulence model to obtain the phase power spectral density Φ that needs to be simulated φ (f), and then the phase power spectral density Φ that needs to be simulated φ (f) Perform uniform sampling to obtain the high frequency part φ of the phase screen HF (m,n); In the low-frequency region, use an improved sub-harmonic method for resampling to obtain the low-frequency part of the phase screen φ LF (m,n), and finally add the high-frequency part and the low-frequency part of the phase screen to form the final turbulent phase screen φ(m,n). The invention adopts the improved sub-harmonic method for sub-harmonic resampling, which solves the problem of insufficient low-frequency information in the traditional spectrum inversion method, greatly improves the accuracy of the simulation results, and the low-frequency error is about 100%. Four. This method can not only quickly and accurately simulate the phase screen of atmospheric turbulence, but also has low computational complexity, which is suitable for popularization and application.
Description
technical field [0001] The invention relates to a method with low computational complexity and capable of quickly and accurately simulating the phase screen of atmospheric turbulence, which belongs to the technical field of meteorology. Background technique [0002] Modeling wavefront distortion induced by atmospheric turbulence has long been an important tool in the study of light propagation in the atmosphere, in the design of large astronomical telescopes and adaptive optics systems, and in the development of advanced speckle imaging algorithms. The methods of studying atmospheric turbulence include theoretical analysis, experimental research and numerical simulation. Numerical simulation has become the main means of studying atmospheric turbulence due to its unique advantages. One of the core problems of this method is how to quickly Accurately build atmospheric turbulence phase screens. [0003] The simulation method for numerically simulating the phase screen of atmos...
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IPC IPC(8): G06F30/20G06F111/10
CPCG06F30/20
Inventor 刘涛张景芝雷艳旭张珂
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)