Single-Doppler-laser-radar-based measurement method of non-uniform wind field wind vector

Abstract

The invention relates to a single-Doppler-laser-radar-based measurement method of a non-uniform wind field wind vector. The method comprises: reading radial wind speed data measured by a single Doppler laser radar and then converting the data into a radial horizontal wind speed according to an elevation angle of the laser radar; on the basis of a VAD method, processing the radial horizontal wind speed at the same height; because of the VAD method, acquiring a background wind speed and a background wind direction on each distance database; combining the background wind speeds with the wind directions on all distance databases to obtain a background wind field wind speed and a wind direction of a measurement area; according to an included angle relationship between the background wind fieldwind direction and a scanning radial direction of the laser radar as well as the background wind field wind speed, calculating a tangential wind speed of each spatial point; and synthesizing the tangential wind speed and the radial wind speed measured directly by the single Doppler laser radar to obtain a wind vector so as to acquire wind vector information of a non-uniform wind field at the measurement time accurately. With the simple method being easy to implement, a defect that the non-uniform wind field information can not be reflected truly because of the uniformity assumption of the non-uniform wind field in the prior art is overcome; and thus the accuracy of the non-uniform wind field inversion is improved.

Description

technical field [0001] The invention belongs to the technical field of laser radar, and in particular relates to a method for measuring the wind vector of a non-uniform wind field based on a single-Doppler laser radar. Algorithm to realize the measurement of wind vector in non-uniform wind field. Background technique [0002] When Doppler lidar is used to measure wind speed, according to the Doppler principle, the overall movement of atmospheric molecules or aerosol particles that characterize the wind speed will shift the frequency of backscattered laser light, that is, the Doppler frequency shift. The Doppler frequency shift is detected by receiving the backscattering signal of the aerosol particles and the local oscillator light in the system, and the radial component of the wind speed is calculated by analyzing the Doppler frequency shift, and then the wind speed, wind direction and other information are reversed. , radial wind speed V Los with Doppler shift f D The r...

AI Technical Summary

Problems solved by technology

[0003]The original method of measuring the wind vector of the non-uniform wind field is obtained after processing the wind speed data directly measured by the Doppler lidar, but due to the The wind speed data measured by a single laser radar is all radial wind speed information, which is not completely consistent with the wind speed information of the actual non-uniform wind field, and cannot truly reflect the actual wind field information at the time of measurement. Therefore, it is necessary to solve the combined wind of the non-uniform wind field Vector to reflect the actual wind speed information at the time of measurement

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