A phase screen simulation method for light propagating in short distance in underwater turbulent flow

A phase screen, close-range technology, applied in design optimization/simulation, instrumentation, calculation, etc., can solve the problem that the phase screen model cannot truly simulate the turbulence characteristics, and the multi-layer phase screen does not consider the phase screen correlation.
CN106529104BInactive Publication Date: 2019-08-23HARBIN INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HARBIN INST OF TECH
Publication Date
2019-08-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a phase screen simulation method of short distance transmission of light in underwater turbulent flow, and belongs to the field of underwater target detection. The phase screen simulation method of short distance transmission of light in underwater turbulent flow is provided for solving the shortcomings that a phase screen model cannot really simulate the properties of turbulent flow as the correlation between phase screens in multiple layers of phase screens is not considered in the prior art. The method comprises the following steps: inputting an initial image; calculating a pixel value of a current reference point by using a reference point with a known value; calculating a relative pixel difference; calculating an absolute value of the reference point; repeating the above process until left and right reference points of all phase screens are calculated; generating multiple processes, wherein each process contains one framework; simultaneously calculating the absolute value of each point in the framework by using a parallel calculation method; repeating the process of calculating the absolute value of each point of each process; and repeating the above steps until all points are calculated. The phase screen simulation method provided by the invention is suitable for the analogue simulation of a transmission model of light in underwater turbulent flow.
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Description

technical field

[0001] The invention relates to a phase screen simulation method for short-distance propagation of light in underwater turbulent flow, belonging to the field of underwater target detection. Background technique

[0002] The detection of underwater targets is one of the important branches of ocean detection. For a moving underwater target, turbulence is bound to be generated during its movement. Converting the direct detection of the target into the indirect detection of the turbulent field generated by it is an important detection method. Therefore, the research on the characteristics of the underwater turbulence field is the main problem in the research of underwater detection. When using laser to study the characteristics of underwater turbulence, for light propagation, the main influence of turbulence is the random fluctuation of the phase of light waves caused by the fluctuation of the refractive index of the water medium. Therefore, establishing the p...

Claims

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