Coherent wind-finding laser radar device

Abstract

The invention discloses a coherent wind-finding laser radar device. The device comprises a signal generating module for amplifying a multi-wavelength local oscillator signal to generate a multi-wavelength laser signal, a signal transceiver module for emitting a multi-wavelength laser signal generated by the signal generating module and receiving an echo signal that carries wind speed information and is scattered by an atmospheric aerosol particle after emergence of the multi-wavelength laser signal into the atmosphere, and a signal processing module coupled to the signal generating module andthe signal transceiver module. The signal processing module is used for carrying out beat frequency processing on the echo signal based on a multi-wavelength local oscillator signal to generate a plurality of frequency shift signals and carrying out wind speed inversion based on the multiple accumulated frequency shift signals to obtain wind speed information. Therefore, the output power of the laser signal in the laser radar device can be improved and thus the signal to noise ratio of the echo signal of the laser radar device can be increased, so that the detection performance of the laser radar device is improved.

Description

technical field [0001] The present application relates to the field of radar, in particular to a coherent wind-measuring lidar device. Background technique [0002] Atmospheric wind field information is an important resource. Accurate atmospheric wind field measurement can improve the utilization rate of wind energy in the field of renewable energy, improve the accuracy of climate model establishment, and enhance the safety of aircraft when taking off and landing. , climate meteorology, military and other fields have very important research value. [0003] The means of wind field information measurement are mainly divided into two categories: passive and active. Traditional passive measurement devices include anemometer, wind vane and radiosonde, etc. Active measurement devices include wind lidar, microwave radar and wind acoustic radar, etc. . Among them, wind lidar has higher temporal and spatial resolution than traditional wind measuring instruments, and can quickly mea...

AI Technical Summary

Problems solved by technology

In actual use, when the fiber amplifier module amplifies a single-wavelength laser signal, due to the narrow linewidth of the single-wavelength laser signal, the nonlinear effect of the fiber amplifier module is prone to occur, which in turn will limit the single-wavelength laser signal in the laser. output power, thereby greatly reducing the detection performance of lidar

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