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Automatic inversion arithmetic based on height of laser radar mixed layer

A technology of laser radar and inversion algorithm, which is applied in the directions of re-radiation of electromagnetic waves, utilization of re-radiation, and measurement devices, which can solve problems such as large errors, low discrimination, and inability to better identify the required information.

Active Publication Date: 2009-09-02
ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0003] The purpose of the present invention is to provide an automatic inversion algorithm for the height of the mixed layer based on laser radar, to solve the problem that the traditional method has low discrimination, large error, cannot identify the required information well, and needs smoothing processing

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  • Automatic inversion arithmetic based on height of laser radar mixed layer
  • Automatic inversion arithmetic based on height of laser radar mixed layer
  • Automatic inversion arithmetic based on height of laser radar mixed layer

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Embodiment Construction

[0031] The implementation process of the algorithm is mainly divided into two parts: the first step is to obtain the aerosol backscattering profile, and the second step is to use the improved gradient method to fit the profile to obtain information such as the height of the mixed layer.

[0032] Part 1: How to Obtain an Aerosol Backscatter Profile:

[0033] Step 1: Starting from the lidar equation, for the 905nm wavelength, the lidar equation is: P(R)=P t Cη(R)R -2 [β α (R)+β m (R)]T a 2 (R)T m 2 (R) (1)

[0034] Step 2: Perform distance correction on the radar equation, and multiply both sides of the equation by R 2 have to:

[0035] X(R)=P(R)R 2 =P t Cη(R)[β α (R)+β m (R)]T a 2 (R)T m 2 (R)

[0036] Step 3: Determine R c , α m (R), α a (R c ), S 1 , S 2 Five parameters.

[0037] To find the backscattering coefficient of an aerosol, start with finding the extinction coefficient of the aerosol.

[0038] A certain height R is known in advance c At (ca...

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Abstract

The invention relates to an automatic inversion arithmetic based on the height of a laser radar mixed layer, including the steps: firstly, inverting a laser radar echoed signal to obtain a gas dispersoid back scattering line drawing, then setting a fitting initial value to confirm a proper initial value by the heights of different mixed layers obtained by different initial values through comparison, and using an improved gradient method and using an error function to fit original signals to obtain the information about the heights of the mixed layers. The invention utilizes a gas dispersoid back scattering echoed signal drawing of a ceilometer to obtain a gas dispersoid back scattering extinction coefficient line distribution drawing and uses the error function to fit a proximal curve of the original signals through the improved traditional gradient method, thereby being capable of accurately calculating the heights of the mixed layers and having the advantages of small errors, high discriminability and well identification to the needed information.

Description

technical field [0001] The present invention relates to the technical field of laser radar, in particular to an automatic inversion algorithm of mixed layer height based on laser radar Background technique [0002] The mixed layer of the atmosphere is the layer of atmosphere below the troposphere that is directly and strongly influenced by the ground. Because of the influence of the non-uniform underlying surface, it will not only affect the radiation budget and meteorological field, but also play an important role in the settlement, transportation and discharge of pollutants, such as the dominance of the distribution of air pollutants . At the same time, since almost all human life activities occur in this layer, its research is closely related to weather forecasting, climate prediction, atmospheric physics research, industrial and agricultural production, environmental protection and aviation safety. The height of the mixed layer is a key parameter to evaluate the air qu...

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Application Information

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IPC IPC(8): G01S17/95
CPCY02A90/10
Inventor 陈臻懿刘文清张玉钧何俊峰阮俊崔益本
Owner ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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