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Method for improving inversion precision of carbon dioxide differential absorption laser radar

A carbon dioxide and lidar technology, applied in the field of atmospheric remote sensing, can solve the problems of low result accuracy and low signal-to-noise ratio, and achieve the effects of good accuracy, reduced hardware parameter limitations, and strong stability.

Active Publication Date: 2020-09-15
WUHAN UNIV
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Problems solved by technology

However, in the inversion of its profile concentration, as the detection height increases, the signal-to-noise ratio of the signal is low, and the accuracy of the inversion results by traditional methods is low

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  • Method for improving inversion precision of carbon dioxide differential absorption laser radar
  • Method for improving inversion precision of carbon dioxide differential absorption laser radar
  • Method for improving inversion precision of carbon dioxide differential absorption laser radar

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Embodiment Construction

[0047] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0048] The invention provides an improved CO based on differential absorption lidar 2 The calculation method of concentration inversion greatly improves the accuracy of lidar inversion of CO2 profile concentration; the method includes the following steps:

[0049] Step S1, introducing the inversion principle and conditional adjustment;

[0050]At present, differential absorption lidar (DIAL) technology has been widely used to detect trace gases. The principle is to detect the difference between the on-line wavelength and off-line wavelength signals, and then invert the density of the target gas in the atmosphere according to the principle of molecular absorption. A standard DIAL system emits two adjacent laser beams of different wavelengths. The wavelength on the strong absorption peak of the target gas is called the on-lin...

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Abstract

The invention provides a method for improving inversion precision of carbon dioxide differential absorption laser radar. The method comprises the following steps: 1, inverting an optical thickness value of each layer of carbon dioxide according to an actual measurement signal of differential absorption laser radar; 2, optimizing the optical thickness value of each layer of carbon dioxide accordingto Chebyshev fitting; and 3, constructing a conditional adjustment model by taking the total carbon dioxide optical thickness value between the lowest signal receiving position and the boundary layeras a limiting condition and taking the signal-to-noise ratio of each layer of signal as a weight to obtain an optimal carbon dioxide optical thickness value of each layer. The inversion method basedon the carbon dioxide differential laser radar profile concentration provided by the invention not only has good precision, but also has strong stability. Therefore, the limitation of carbon dioxide inversion precision on hardware parameters is greatly reduced, and more accurate data is provided for researching carbon cycle and climate change.

Description

technical field [0001] The invention relates to the field of atmospheric remote sensing, and effectively utilizes signals with high signal-to-noise ratio collected by differential absorption laser radar to improve the accuracy of CO2 profile concentration inversion. Background technique [0002] CO 2 It is currently the most important greenhouse gas, and its distribution is closely related to climate change. Clouds and the Earth's surface reflect part of the incident solar radiation back into space, partly absorbed by the atmosphere and the rest by the Earth's surface, CO 2 Molecules warm the Earth's surface. It makes the human environment more livable. If there is no greenhouse gas, the average temperature of the earth will be 30 ℃ lower than it is now. [0003] However, if atmospheric CO 2 If the content is too high, its impact will endanger the entire natural environment. The increase in temperature will melt the sea ice in the Arctic and Antarctic, leading to sea lev...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39G01S17/95
CPCG01N21/39G01N2021/394G01S17/95Y02A90/10
Inventor 史天奇马昕韩舸裴志鹏
Owner WUHAN UNIV
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