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Cirrus cloud micro-physical parameter calculation method for terahertz radar

A technology of physical parameters and calculation methods, which can be applied in the direction of using re-radiation, reflection/re-radiation of radio waves, measurement devices, etc. Application value, simple steps, reliable calculation results

Active Publication Date: 2019-04-16
SHANGHAI RADIO EQUIP RES INST
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Problems solved by technology

Most of the papers are about the scattering characteristics of ice crystal particles in the terahertz frequency band, and the feasibility analysis of dual-frequency calculation of millimeter wave and terahertz wave, but there is a lack of research results on the calculation method of cloud microphysical parameters in the terahertz frequency band

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  • Cirrus cloud micro-physical parameter calculation method for terahertz radar
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  • Cirrus cloud micro-physical parameter calculation method for terahertz radar

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Embodiment Construction

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0026] We usually use three microphysical parameters of cirrus clouds: the number density of ice crystal particles in cirrus clouds, the diameter of ice crystal particles, and the geometric mean diameter of ice crystal particles to describe the microphysical characteristics of cirrus clouds. The invention provides a method for calculating microphysical parameters of cirrus clouds. The invention utilizes the scattering characteristic parameters of ice crystal p...

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Abstract

The invention provides a cirrus cloud micro-physical parameter calculation method for a terahertz radar. The cirrus cloud micro-physical parameter calculation method is characterized in that by usinga discrete dipole approximation method, particle scattering characteristic data in the terahertz frequency band are calculated, by combining cirrus cloud ice crystal particle spectrum distribution parameters, a radar reflectivity factor is calculated, a corrected forward physical model is established, by minimizing cost functions, an iterative solution of a to-be-inverted parameter is obtained, the sum of a set cirrus cloud ice crystal particle spectrum parameter and a random error is used as an iteration initial value, to-be-inverted cirrus cloud micro-physical parameters are determined through iterative operation, the calculation result is compared with set cirrus cloud micro-physical parameters, so that it is judged that the method can be effectively used for calculating the cirrus cloud micro-physical parameters. The method has the advantages that the steps are simple, the calculation is reliable, moreover, a lot of statistical data is not needed, and the quite good practical application value is achieved.

Description

technical field [0001] The invention relates to a method for microphysical parameters of cirrus clouds, in particular to a method for inversion calculation of microphysical parameters of cirrus clouds by using terahertz radar reflectivity factors. Background technique [0002] Cirrus cloud is one of the cloud types that often appear around the world. It is mainly composed of various spherical and non-spherical ice crystal particles, also known as ice cloud. The size, shape, number concentration, ice water content, and particle spectrum of ice crystal particles in the cloud The accuracy of the microscopic features such as ions directly affects the accuracy of the description of its scattered radiation characteristics, and its observation and characteristic parameter calculation research are of great significance. [0003] Because the size of ice crystal particles in cirrus clouds has higher requirements on the sensitivity of detection equipment, compared with the current main...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/95
CPCG01S13/95Y02A90/10
Inventor 丁霞霍熠炜王平王彪
Owner SHANGHAI RADIO EQUIP RES INST
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