A Coherent Doppler LiDAR Based on Multi-Wavelength Beam Synthesis

Abstract

The invention discloses a multi-wavelength-beam-combination coherent Doppler laser wind measurement radar, which comprises a multi-wavelength laser light source module, a radar transmit-receive optical antenna module and a signal reception and processing module. The multi-wavelength laser light source module comprises a narrow linewidth seed light source outputting linear polarization continuous laser, an electro-optic waveguide phase modulator connected with the output end of the narrow linewidth seed light source and loaded with modulation signals and bias voltage, a fiber beam splitter connected with the output end of the electro-optic waveguide phase modulator, and an acousto-optic modulator connected with one output end of the fiber beam splitter and loaded with pulse chopping signals. The multi-wavelength-beam-combination coherent Doppler laser wind measurement radar improves laser emission power and increases echo signal-to-noise ratio, and is suitable for the application fields of meteorological monitoring, aviation safety early warning and wind energy resource assessment and the like.

Description

technical field [0001] The invention belongs to the technical field of meteorological radar detection, and in particular relates to a coherent Doppler laser wind radar combined with multi-wavelength light beams. Background technique [0002] Atmospheric wind field is the main driving force for the circulation of water, aerosol and other substances in the atmosphere, and it has very important research value in weather forecasting, earth environment and dynamic meteorology research. Compared with traditional wind measuring instruments, laser wind radar has more advantages in space-time resolution and speed measurement accuracy, and can quickly obtain high-precision wind field data. Laser wind radar has become an important means of measuring wind field. [0003] According to the measurement method, laser wind radar can be divided into two categories: non-coherent Doppler laser radar and coherent Doppler laser wind radar. Among them, the coherent Doppler lidar wind radar mainl...

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Problems solved by technology

[0005] In order to overcome the above problems, the object of the present invention is to provide a coherent Doppler laser wind radar with multi-wavelength beam synthesis, which solves the problem that the output power of the existing single-wavelength narrow linewidth laser is limited, thus limiting the farthest range of the radar. For the problem of measuring distance, the present invention increases the laser power and increases the radar measurement distance

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