Correction method of extinction coefficient below low clouds in laser radar retrieval

A technology of laser radar and extinction coefficient, applied in the field of laser radar and environmental science, it can solve the problem of small extinction coefficient under the clouds, and achieve the effect of correcting deviation

Inactive Publication Date: 2017-04-26
无锡中科光电技术有限公司
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Problems solved by technology

When there are middle and low cloud layers and the echo signal below the cloud layer is strong, when the traditional inversion method (Fernald method,

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  • Correction method of extinction coefficient below low clouds in laser radar retrieval
  • Correction method of extinction coefficient below low clouds in laser radar retrieval
  • Correction method of extinction coefficient below low clouds in laser radar retrieval

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[0023] In order to make the objectives, technical solutions, and advantages of the present invention clearer, a detailed description will be given below in conjunction with specific data. Here, the illustrative examples of the present invention are used to explain the present invention, but not as a limitation to the present invention.

[0024] The correction method provided by the present invention uses a spline interpolation method to fit the height interval of the lidar PRR (distance squared correction signal) cloud layer to obtain a false signal without cloud layer, and use the Fernald inversion method to obtain a false signal that is not affected by the cloud layer. Extinction coefficient, and then correct the extinction coefficient under the cloud in the original extinction signal. The main steps are as follows:

[0025] (1) The lidar equation corresponding to the backscattered echo signal of the meter scattering lidar is:

[0026]

[0027] Among them: P(R) is the backscattere...

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Abstract

The invention discloses a correction method of an extinction coefficient below low clouds in laser radar retrieval. The method comprises the following steps: afresh assigning data of the height area of the clouds through a spline interpolation technology according to a signal above the clouds and a signal below the clouds to obtain a new fitting signal free of the clouds, and carrying out retrieval to obtain a near ground extinction coefficient which is not affected by the clouds and is used for replacing an extinction coefficient of a corresponding height in an original extinction coefficient in order to effectively correct a retrieval result deviation caused by the clouds.

Description

technical field [0001] The invention relates to the fields of environmental science and laser radar, in particular to a method for correcting the extinction coefficient of the laser radar inversion below the middle and low clouds. Background technique [0002] LiDAR is an important technical means in the research field of detecting the temporal and spatial distribution of the atmosphere. Lidar has high spatial and temporal resolution, allowing atmospheric observation under various conditions, and the detection range can cover near the ground to 100km altitude. There are various interactions between laser radiation and atmospheric components. In addition to detecting trace gases, aerosols, and clouds, it can also detect basic atmospheric parameters such as temperature, pressure, humidity, and wind. Lidar can monitor the atmospheric change process of several cubic meters, seconds or even the whole world and several years. LiDAR has been applied to turbulent flow process, diu...

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Application Information

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IPC IPC(8): G01N15/00G01S17/95G01S7/48
CPCG01N15/00G01S7/48G01S17/95Y02A90/10
Inventor 高洁李岭刘胜利万学平
Owner 无锡中科光电技术有限公司
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