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Asymmetry measurement method for two-way atmosphere turbulence optical transmission channel

A technology of atmospheric turbulence and measurement method, which is applied in the field of atmospheric turbulence channel light wave transmission, and can solve problems such as the inconvenient analysis of the asymmetry of two-way atmospheric turbulence optical transmission channels

Active Publication Date: 2017-03-15
CHANGCHUN UNIV OF SCI & TECH
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Problems solved by technology

A single random phase screen is inconvenient for analyzing the asymmetry of bidirectional atmospheric turbulent optical transmission channels

Method used

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  • Asymmetry measurement method for two-way atmosphere turbulence optical transmission channel
  • Asymmetry measurement method for two-way atmosphere turbulence optical transmission channel
  • Asymmetry measurement method for two-way atmosphere turbulence optical transmission channel

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Embodiment Construction

[0042] In order to make the features and advantages of the method more clear, the method will be further described below in conjunction with specific embodiments. In this embodiment, the laser 104 selects a semiconductor laser with a wavelength of 808 nm and the laser 205 selects a semiconductor laser with a wavelength of 793 nm. These two wavelengths all belong to the 800 nm band, and the output frames of the CCD detector 106 and the CCD detector 206 The frequency is set to 1000 Hz, and the computer 107 and the computer 207 respectively continuously collect 30,000 frames of spot images to realize the statistical calculation of the variance of the centroid position of the spot.

[0043] A method for measuring the asymmetry of a two-way atmospheric turbulent optical transmission channel, first using such as figure 2 The shown two-way atmospheric turbulence optical transmission channel light wave arrival angle fluctuation variance measurement system to measure the light wave ar...

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Abstract

The invention relates to an asymmetry measurement method for a two-way atmosphere turbulence optical transmission channel. The method is characterized in comprising the steps of firstly, measuring optical wave angle of arrival fluctuation variances in two transmission directions by employing an optical wave angle of arrival fluctuation variance measurement system of the two-way atmosphere turbulence optical transmission channel; secondly, calculating valid coherent lengths of two random phase screens at positions of z=L / 4 and z=L / 3 according to the angle of arrival fluctuation variances in the two transmission directions; and finally, calculating the asymmetry of the two-way atmosphere turbulence optical transmission channel according to the valid coherent lengths of the random phase screen P <l > and the random phase screen P <r >. According to the method, the asymmetry of the two-way atmosphere turbulence optical transmission channel is obtained by measuring the optical wave angle of arrival fluctuation variances of the two-way atmosphere turbulence optical transmission channel, thereby providing actual data support for performance analysis and optimization design of links of a two-way free space optical transmission system in different transmission directions.

Description

technical field [0001] The invention relates to a method for measuring the asymmetry of a two-way atmospheric turbulent optical transmission channel, and belongs to the technical field of atmospheric turbulent channel optical wave transmission. Background technique [0002] Free space optical communication is a research hotspot in the field of wireless communication. The free-space optical communication system working near the ground will be affected by atmospheric turbulence, and the communication optical signal will produce intensity fluctuations, phase fluctuations, and angle-of-arrival fluctuations. In order to analyze the influence of atmospheric turbulence on light wave transmission, it is necessary to obtain the actual atmospheric turbulence parameters. The refractive index structure constant is a key parameter of atmospheric turbulence, and various light wave atmospheric turbulent transport statistics depend on this parameter. Although the structural constant of at...

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Application Information

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IPC IPC(8): H04B10/07
CPCH04B10/07
Inventor 陈纯毅杨华民蒋振刚倪小龙娄岩
Owner CHANGCHUN UNIV OF SCI & TECH
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