Rainfall identification method and device based on wind measurement laser radar

Abstract

The invention discloses a rainfall identification method and device based on a wind measurement laser radar. According to the method and device of the invention, the skewness coefficient of the powerspectrum of the wind measurement laser radar can be utilized to identify rainfall and perform wind speed and rain speed separation. The basic principles of the method are as follows: aerosol and raindrop signals exist at the same time under a rainfall condition, the power spectrum has obvious skewness, and a rainfall power spectrum is identified according to the skewness; double-peak inspection iscarried out on the identified rainfall power spectrum; double-peak fitting is directly carried out on a power spectrum with an obvious double-peak structure, and double-peak fitting is carried out ona power spectrum without the obvious double-peak structure through few fitting parameters. And finally, separation of wind speed and rain speed is realized. The method is applied to guaranteeing aviation safety, contributes to improving a climate model, a weather forecast model and an atmospheric pollution diffusion model, and has the advantages of high flexibility, high spatial-temporal resolution and high accuracy.

Description

Technical field [0001] The present invention relates to the field of striking laser radar and atmospheric detection, and more particularly to rainfall recognition methods based on striking laser radar, a wind speed rain separation method. Background technique [0002] High-temporal resolution rainfall detection engineering applications are essential, for example, frozen precipitation may reduce aerodynamic performance of the aircraft. Accurate measurement of rainfall can assess the effect of artificial rainfall operation. In addition, rainfall detection has an important role in understanding the microscopic physical process of atmospheric boundary layers, improving weather models and weather forecasts. [0003] The wind laser radar compared to the traditional rainfall detecting equipment, has the advantages of multi-scan mode, high-temporal resolution and high precision. Laser radar still has some problems in rainfall recognition. Under rainfall conditions, due to the interferenc...

AI Technical Summary

Problems solved by technology

Under rainfall conditions, due to the interference of the rain spectrum, the wind speed retrieval error occurs

At present, rainfall can be judged by increasing the spectral width, but wind shear, turbulence, and multiple scattering of clouds can all lead to an increase in spectral width, which interferes with the noise of rainfall identification

When the aerosol signal is covered by the raindrop signal (or the raindrop signal is covered by the aerosol signal), when the double peak structure is not obvious, the spectral width increase is not obvious, and it is difficult to identify the rainfall at this time

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