Wind field inversion method and system based on eight-beam wind profile laser radar

Abstract

The invention discloses a wind field inversion method and system based on an eight-beam wind profile laser radar, a seed source laser generates linearly polarized light, the linearly polarized light is divided into a transmitting signal and a local oscillator signal after passing through a beam splitter, the transmitting signal generates frequency shift through an acousto-optic modulator and is modulated into pulsed light, and the pulsed light is transmitted to the local oscillator signal. The pulsed light is subjected to power amplification treatment by the amplifier, passes through the circulator and is emitted by the telescope; a wind profile laser radar echo signal is received by a telescope, the wind profile laser radar echo signal and a local oscillator signal are jointly input into a coupler, an output result of the coupler is converted into an intermediate-frequency electric signal through a balance detector, the intermediate-frequency electric signal is sampled by an acquisition card, power spectrum estimation is carried out on the sampled echo signal, and through pulse accumulation averaging, the wind profile laser radar echo signal is obtained. Doppler frequency shift is extracted, and inversion of wind speed information of the wind field is achieved. Real-time atmospheric wind field three-dimensional detection with high temporal-spatial resolution, low detection blind area, long distance and high wind measurement precision can be realized.

Description

technical field [0001] The invention relates to the technical field of three-dimensional atmospheric wind field detection by wind profile laser radar, in particular to a wind field inversion method and system based on eight-beam wind profile laser radar. Background technique [0002] The statements in this section merely mention the background technology related to the present invention and do not necessarily constitute the prior art. [0003] Real-time measurement of atmospheric wind field parameters plays an important role in weather analysis and forecasting, including improving wind energy utilization, particle tracking, boundary layer measurement, and airport safety. Early wind measuring devices, such as wind measuring balloons, high-altitude sounders, radio theodolites, microwave radars, etc., could not meet actual needs due to their short detection range, low detection accuracy, and low spatial resolution. [0004] Wind profile coherent detection lidar has been widely...

AI Technical Summary

Problems solved by technology

In previous studies, three-beam and five-beam lidars were mostly used, but due to weak echo signals, radar detection is easily affected by various interferences. In the echo power spectrum of the pointing measurement, a large interference spectrum peak appears, submerging the echo signal, and causing a large error in the calculation result of the wind measurement

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