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First-order scattering calculation method suitable for long-distance laser to pass through spherical cirrus cloud

A calculation method and long-distance technology, applied in the field of laser transmission, can solve the problems of inaccurate calculation results and large errors, and achieve the effect of accurate calculation results and good practical value

Active Publication Date: 2020-05-29
XIAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of this invention is to provide a first-order scattering calculation method suitable for long-distance laser passing through spherical cirrus clouds, which solves the problem of large errors in existing calculation methods Large and inaccurate calculation results

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  • First-order scattering calculation method suitable for long-distance laser to pass through spherical cirrus cloud
  • First-order scattering calculation method suitable for long-distance laser to pass through spherical cirrus cloud
  • First-order scattering calculation method suitable for long-distance laser to pass through spherical cirrus cloud

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Embodiment Construction

[0035] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] The interior of the atmosphere is complex, and the transmission of lasers in the atmosphere will be attenuated by atmospheric molecules and aerosols, and the lower the altitude, the greater the attenuation. The distribution of ice crystal particles in cirrus clouds is uneven. The ice crystal particles in the bottom layer are large in size, mostly polymers, and have a high particle density. The upper layer is smaller in size, mostly columnar and quasi-spherical, and has a low particle density. The above factors will affect the calculation of the simulation. result.

[0037] The calculation method of the present invention is suitable for the laser passing through the spherical cirrus cloud at a distance of not less than 180 kilometers.

[0038] The present invention is applicable to the first-order scattering calculation method of long-...

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Abstract

The invention discloses a first-order scattering calculation method suitable for long-distance laser to pass through spherical cirrus cloud. The method comprises the following steps: in atmosphere with a proper distance from a target, laser is emitted, the upper surface and the lower surface of cirrus cloud in the model are set to be spherical planes, extinction coefficients of any point in the atmosphere are set, the direct component of the laser passing through the atmosphere is calculated, and in an ideal state, namely, factors of atmospheric molecules and aerosol are not considered, an n-medium scattering model of a successive scattering method is utilized to obtain first-order scattering power; when the first-order scattering effect of atmospheric molecules and aerosol factors on laser is increased, the first-order scattering power considering the atmospheric molecules and aerosol is obtained through calculation, and then an expression of first-order scattering of atmospheric attenuation is derived. According to the calculation method, the plane of the cirrus cloud is changed into the spherical plane from the original plane, and the factors of atmospheric molecules and aerosolare considered in the original ideal state, so that the calculation result is more accurate, and the calculation method has a very good practical value.

Description

technical field [0001] The invention belongs to the technical field of laser transmission, and relates to a first-order scattering calculation method applicable to long-distance laser passing through spherical cirrus clouds. Background technique [0002] Clouds are divided into water clouds and ice clouds, and ice clouds are also called cirrus clouds. Cirrus clouds are composed of fine ice crystals, which are distributed at higher altitudes, where the ice crystals are less dense and have good light transmission. In the vertical direction, the attenuation of the laser by the cirrus cloud is small, but in the horizontal direction, when the distance between the laser emitter and the target is very long, the attenuation of the laser is very large. In the calculation, the cirrus cloud is usually regarded as a parallel plane, but when the distance between the laser emitter and the target is far away, the approximation of the parallel plane will cause a large calculation error, es...

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Application Information

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IPC IPC(8): G06F17/10
CPCG06F17/10Y02A90/10
Inventor 王明军魏亚飞张佳琳翟治珠林妞妞
Owner XIAN UNIV OF TECH
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