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Hybrid wind-measuring laser radar

A wind-measuring lidar and hybrid technology, applied in the direction of measuring devices, radio wave measurement systems, climate sustainability, etc., can solve the problems of high requirements for real-time data processing equipment, limited distance resolution, unfavorable integration, etc. Achieve the effect of avoiding the amount of data calculation, compact structure, and low requirements for computing power

Active Publication Date: 2019-01-04
江苏光在科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0004] To sum up, the traditional direct detection wind measurement lidar has high cost and heavy equipment, which is not conducive to integration; the traditional coherent detection wind measurement lidar has limited range resolution, large amount of data, and high requirements for real-time data processing equipment

Method used

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Embodiment

[0044] figure 1 It is a structural block diagram of a hybrid wind laser radar of the present invention; figure 1 As shown, it includes: a light source module 1, an optical transceiver module 2, a frequency discrimination module 3, a detector module 4 and a data processing module 5; wherein:

[0045] The light source module 5 includes a continuous light laser 10, a first beam splitter 11, a pulsed light generator 13, a second beam splitter 14, a third coupler 16, and an optical pulse amplifier 18; the continuous light laser 10 is used to output continuous light Light; the laser light output by the continuous light laser 10 is divided into two paths through the first beam splitter, one path is input into the pulsed light generator 13, and the other path is input into the detector module 4 as local oscillator light; the pulsed light generator 13 is used to output the pulsed light , the pulsed light output by the pulsed light generator 13 is divided into two paths through the sec...

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Abstract

The invention discloses a hybrid wind-measuring laser radar with the integration of the technologies of a coherent laser radar and a direct laser radar. An optical frequency discriminator is used in alaser radar system, echo signal light is divided into two beams of light including Doppler frequency shift information, the beat frequency of the two beams of light and local-oscillator light is carried out, and two balance detectors are used for detection. For intermediate frequency current signals output by the balance detectors, a carrier-to-noise ratio is calculated directly from a time domain, and according to a proportional relationship between the carrier-to-noise ratio and signal intensity, the light intensity information of the signal light can be obtained. Further, a wind speed is calculated according to a method of inverting the wind speed by directly using a wind-measuring laser radar technology. According to the wind-measuring laser radar, the balance detectors are used to detect the light intensity information of the signal light, the optical frequency discriminator is used to identify the Doppler frequency shift information, the technologies of the coherent laser radarand the direct laser radar are combined, the requirement on the computing power is low, and the method has the advantages of compact structure, low cost and high precision.

Description

technical field [0001] The invention relates to a laser radar, in particular to a hybrid wind measuring laser radar. Background technique [0002] Lidar has been widely used in speed measurement, distance measurement, imaging, pollutant monitoring, wind measurement, temperature measurement, etc. field. Wind lidar is an effective means of wind field measurement. Accurate atmospheric wind field measurement is of great significance for detecting air pollution, obtaining military environmental intelligence, improving aerospace safety, improving the accuracy of weather forecast, and improving climate models. [0003] According to the way of receiving signals, wind lidar can be divided into direct detection wind lidar and coherent detection wind lidar. The inventors of the present invention have discovered through research that traditional direct detection and wind measurement laser radars use optical discriminators to convert Doppler frequency shift information into relative ch...

Claims

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Application Information

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IPC IPC(8): G01S17/95
CPCG01S17/95Y02A90/10
Inventor 魏天问夏和娣
Owner 江苏光在科技有限公司
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