Sounding laser full waveform data-based diffuse attenuation coefficient extraction method and system

Abstract

The invention discloses a sounding laser full-waveform data-based diffuse attenuation coefficient extraction method and system. The method comprises the following steps: filtering to obtain effective laser sounding points from full-waveform data in sounding laser data; extracting emission intensity and echo intensity of each effective laser sounding point obtained by filtering from the full-waveform data, and after extracting the echo intensity, generating a water body back scattering function corresponding to a water body back scattering waveform according to an algorithm; selecting a plurality of time point pairs with a preset time interval from the water body back scattering function corresponding a single laser sounding point, and calculating an initial diffuse attenuation coefficient of each time point pair; taking an average value of the initial diffuse attenuation coefficients of all the time point pairs as a final diffuse attenuation coefficient of the laser sounding points. According to the invention, the diffuse attenuation coefficient value can be calculated by using the full-waveform data of the single sounding points, and echo intensity information and a depth value of each sounding point do not need to be acquired, the calculation accuracy of the diffuse attenuation coefficient is high.

Description

technical field [0001] The invention relates to the technical field of laser communication, in particular to a method and system for extracting diffuse attenuation coefficients based on full waveform data of depth-sounding lasers. Background technique [0002] Diffuse attenuation coefficient is the inherent optical property of water body, which reflects the change and distribution of light in water body, and directly affects the transparency of water body and the depth of euphotic layer. Studying the characteristics of the diffuse attenuation coefficient can better understand the optical properties and optical types of water bodies, analyze water quality, aquatic organisms, hydrological elements and water chemical properties, as well as ocean heat exchange, phytoplankton photosynthesis, etc., for the environmental quality evaluation and Provide basic data for ecological restoration of water body environment. [0003] Since the transmission of natural light in water is a com...

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Problems solved by technology

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method and system for extracting the diffuse attenuation coefficient based on the full waveform data of the depth-sounding laser, aiming at solving the problem of the calculation method of the diffuse attenuation coefficient in the prior art, such as in cloudy and foggy weather, at night, etc. It cannot be measured, and the measurement accuracy and resolution are relatively low, which brings inconvenience to the environmental quality assessment of water bodies and the ecological restoration of water bodies.

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