X-band dual-polarization weather radar quantitative precipitation measurement method and system

A weather radar and quantitative measurement technology, applied in the field of atmospheric science, can solve the problem of inaccurate quantitative measurement of precipitation by radar, and achieve the effect of accurate quantitative measurement of rainfall rate

CN110488393AActive Publication Date: 2019-11-22INST OF ATMOSPHERIC PHYSICS CHINESE ACADEMY SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-11-22

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Abstract

An embodiment of the invention provides an X-band dual-polarization weather radar quantitative precipitation measurement method and an X-band dual-polarization weather radar quantitative precipitationmeasurement system. The X-band dual-polarization weather radar quantitative precipitation measurement method comprises the steps of: utilizing an X-band dual-polarization radar to obtain radar data in a detection range, and using a laser raindrop spectrograph to obtain an actually measured raindrop spectrum of a detection point; acquiring a radar reflectivity factor and an attenuation rate; acquiring an actually measured rainfall rate and a radar reflectivity factor true value of the detection point based on the actually measured raindrop spectrum, acquiring an attenuation rate true value ofthe detection point through T matrix scattering simulation, acquiring a rainfall function in the detection range through fitting the actually measured rainfall rate and the attenuation rate true value, and further acquiring a rainfall rate; inverting the rainfall rate by using the attenuation rate if the radar reflectivity factor is greater than a first set threshold value; and acquiring an attenuation rate function in the detection range through fitting the radar reflectivity factor true value and the attenuation rate true value is the radar reflectivity factor is not greater than the first set threshold value, and then acquiring a rainfall rate in the detection range based on the attenuation rate function. The X-band dual-polarization weather radar quantitative precipitation measurementmethod and the X-band dual-polarization weather radar quantitative precipitation measurement system can acquire more precise predicted rainfall rates.
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Description

technical field

[0001] The invention relates to the technical field of atmospheric science, in particular to a method and system for quantitatively measuring precipitation with an X-band dual-polarization weather radar. Background technique

[0002] Radar is widely used in the research of precipitation detection and measurement, and has made outstanding contributions. At present, the quantitative measurement of precipitation by radar has become one of the main contents of radar meteorology research. The existing radar detection and measurement methods mainly include the following:

[0003] One is: based on single-polarization weather radar (for example, Doppler weather radar), using the radar meteorological equation to calculate the radar reflectivity factor Z according to the measured echo power H (unit: mm 6 m -3 ), then according to the predetermined Z-R relationship (Z=aR b ) to derive the rainfall rate R (unit: mm / h).

[0004] The second is: based on dual-polariza...

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Embodiment Construction

[0063] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. 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.

[0064] The working frequency of the radar is very wide, and the S-band, C-band, X-band, Ku-band and K-band are mainly used in meteorology. Due to the frequency characteristics of each band, S, C, and X bands are generally used for rain radar bands, while X-band radars have shorter wavelengths than S-band and C-band radars, and precipitation (...