Method and system for detecting atmospheric vertical movement speed based on two types of radars

Abstract

The invention discloses a method and a system for detecting an atmospheric vertical movement speed based on two types of radars. The method comprises the following steps: step S1. detecting through a wind profile radar to obtain atmospheric vertical movement speed spectrum data, and detecting through a cloud radar to obtain rainfall particle vertical movement speed spectrum data; step S2. outputting the detected atmospheric vertical movement speed spectrum data and the rainfall particle vertical movement speed spectrum data to a data processor; step S3. locating a zone (Vr-Sigmaw, Vr+Sigmaw) or a zone (Vr-Sigmaw / 2, Vr+Sigmaw / 2) in an atmospheric vertical movement speed spectrum to be a detection shielding area by the data processor; and S4. detecting and processing a wind profile radar vertical speed spectrum by the data processor outside the detection shielding area to obtain the atmospheric vertical movement speed. By adopting the method and the system, the atmospheric vertical movement speed detected by the wind profile radar under the rainfall conditions is corrected, and thus the accuracy of detecting the atmospheric movement by the wind profile radar under the rainfall conditions is improved.

Description

Technical field [0001] The invention relates to the field of atmospheric science and technology, in particular to a method and system for detecting vertical velocity of atmospheric motion based on wind profile radar and cloud radar. Background technique [0002] Wind profiler radar is a kind of remote sensing equipment for high-altitude wind field detection by transmitting electromagnetic beams in different directions to high altitude, receiving and processing the information returned by these electromagnetic beams due to the uneven vertical structure of the atmosphere. Wind profiler radar uses the Doppler effect to detect changes in weather factors such as wind direction and wind speed over it with altitude, and has the advantages of high detection time and space resolution and high degree of automation. Wind profiler radar can provide a variety of data products based on wind fields. Its basic data products include radial velocity, spectral width, signal-to-noise ratio, horizont...

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Problems solved by technology

[0004] like Figure 1a As shown, in the case of fine weather, the detection accuracy of the wind profiler radar is relatively high, and the radial velocity V measured by the wind profiler radar r is the vertical velocity w of the atmosphere; but in the case of precipitation weather, the wind profiler radar is very sensitive to precipitation particles, so the wind measurement performance of the wind profiler radar will be affected under precipitation conditions, especially in convective precipitation conditions

like Figure 1b As shown, when there are precipitation particles, since the backscattering signal is usually larger than the scattering of atmospheric turbulence, according to the method of detecting the maximum signal (Spectral Peak) in the Doppler spectrum of the wind profiler radar, the measured V r is the falling velocity v of precipitation particles p , resulting in wind measurement errors. Wuertz et al. (1988) analyzed the influence of precipitation on the detection accuracy of wind profiler radars. The results obtained are: the accuracy is 2m / s under uniform precipitation conditions, and 1m / s under clear sky conditions Under the condition of precipitation that changes drastically with time and space, its detection error can reach more than 4m / s, the reason is that the correction of vertical motion speed is unreasonable and the precipitation is uneven

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