1.5 [mu]m wavelength aerosol detection laser radar based on pulse coding and signal decoding method

Abstract

The invention relates to a 1.5 [mu]m wavelength aerosol detection laser radar based on pulse coding and a signal decoding method. According to the laser radar, the output end of a seed laser, the input ends and output ends of a first electro-optical modulator, a second electro-optical modulator, an optical fiber amplifier and a beam splitter, and the input end of a collimator are connected in sequence; the output end of a receiving telescope, the input ends and output ends of a filter, an indium gallium arsenic quantum detector, an acquisition card and a computer and the input end of a waveform generator are connected in sequence; and the input end of an energy detection channel is connected with the output end of the beam splitter, the output end of the energy detection channel is connected with the input end of the acquisition card, and the output end of the waveform generator is connected with the first electro-optical modulator and the second electro-optical modulator. According to the laser radar and the method, the fuzzy distance of a time-of-flight method is broken through, the size is reduced, meanwhile, the stability of a radar system is improved, the identification capacity for large-particle-size aerosol distribution is improved, the cloud penetrating capacity is improved, and detection equipment is provided for researching atmospheric science.

Description

technical field [0001] The invention belongs to the technical field of laser radar, and in particular relates to a 1.5 μm wavelength aerosol detection laser radar based on pulse coding technology and a signal decoding method. Background technique [0002] Environmental pollution is becoming more and more serious, and the detection of meteorological elements and pollutants is becoming more and more important. Thanks to its high temporal and spatial resolution, lidar is beneficial in detecting wind direction, speed, and pollutant transport. Coherent detection lidar is mainly used to detect atmospheric parameters in the boundary layer, and direct detection lidar can cover atmospheric parameter detection at longer distances and higher altitudes. For the first time, the Haut-Provence Observatory (OHP) used double-edge FPI as a frequency discriminator to achieve wind detection up to 50 kilometers long. A Rayleigh lidar based on a single FPI was developed at the Arecibo Observator...

AI Technical Summary

Problems solved by technology

These can improve the signal-to-noise ratio to a certain extent, but the current pulse power of lasers is limited, increasing the average power of emission by increasing the pulse time domain width will sacrifice the distance resolution; the increase of the telescope aperture will lead to increased cost and reduced stability; However, the pulse accumulation method adopted by the lidar based on the time-of-flight method has the problems of poor time resolution and aliasing distance.

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