C-band polarized meteorological radar external calibration method based on simulation calibration body
A technology of analog calibration and weather radar, applied in ICT adaptation, climate sustainability, radio wave measurement system, etc., can solve the problem of high calibration cost and achieve the effect of accurate data
Active Publication Date: 2020-05-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology
[0004] In view of the above problems, the present invention provides a method for external calibration of C-band polarized meteorological radar based on an analog calibration body, which overcomes the technical limitations of geographic location (mountain top, airship, tower, etc.), and solves the problem of higher calibration costs. and easy to repeat calibration
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[0042] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0043] Such as figure 1 As shown, the specific implementation steps of this embodiment are as follows:
[0044] Step S1: Establish a weather target radar equation model based on Rayleigh scattering
[0045] According to the theory of scattering of radar electromagnetic waves by spherical particles, when the following conditions are met, it conforms to Rayleigh scattering
[0046]
[0047] The echo power of the radar equation model based on Rayleigh scattering can be expressed as:
[0048]
[0049] P t is the transmitter power, G is the antenna gain, λ is the radar operating wavelength, θ,...
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The invention discloses a C-band polarized meteorological radar external calibration method based on a simulation calibration body. The method comprises the steps of: building a meteorological radar model based on Rayleigh scattering, and deducing a radar reflectivity factor; arranging n simulation calibration balls at equal intervals in the distance direction, calibrating the reflectivity factorand a differential reflection factor, and acquiring a Pr_th-Z relation in the distance direction according to a radar sectional area and a radar constant of the simulation calibration balls; comparingthe actually measured Pr-Z with the Pr_th-Zt relation to determine an error; screening the calibrated data by using threshold factors, setting the data exceeding the threshold factor as null, and drawing a radar image according to the null data, with the threshold factors comprising a ground clutter threshold factor and a signal power / noise power threshold factor. According to the invention, calibrated data can be more precise and closer to real data; the method is based on the simulation calibration body, an outdoor calibrator is not needed, and the labor cost is reduced.
Description
technical field [0001] The invention belongs to the fields of weather radar signal processing and weather radar imaging, and in particular relates to an external calibration method for C-band polarization weather radar based on an analog calibration body. Background technique [0002] The new generation of meteorological radar adopts the coherent pulse Doppler system, which can observe short-term nearby meteorological information such as rainfall rate, rainfall type, air flow, turbulence, and wind shear, and play an important role in weather forecasting, disaster monitoring, and agricultural planting. played an important role. In the point target radar equation of meteorological particles, the echo power is a value proportional to the Radar CrossSecion (RCS) and inversely proportional to the fourth power of the distance of meteorological particles. Mie established a general theory of the backscattering energy of a light plane wave impinging on a conductive ball in a colloid...
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IPC IPC(8): G01S7/40G01S13/95
CPCG01S7/4052G01S13/95G01S7/4095Y02A90/10
Inventor 毕辉尹杰邓佳瑞
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS