A method and system for extracting reflectivity of seabed substrate from lidar bathymetry data

Abstract

The invention provides a seabed sediment reflectivity extraction method and system for laser radar sounding data. The method comprises: seabed echo waveform data included by airborne full-waveform laser radar sounding data are obtained and solution processing is carried out on the seabed echo waveform data based on a Richardson-Lucy deconvolution iterative algorithm to obtain an echo intensity and a seawater depth; according to a linear regression method, seabed echo waveform data solution is carried out to obtain sea water attenuation coefficient; echo intensity correction is carried out on a hot-spot effect caused by a seabed topographic slope and pulse broadening, thereby obtaining a slop of the seabed sediment and a seabed sediment reflectivity. According to the invention, the influence on the seabed echo intensity by various factors like a seawater attenuation coefficient, pulse broadening, and a hot spot effect are taken into consideration; and the seabed sediment reflectivity is inverted precisely.

Description

technical field [0001] The invention relates to the technical field of marine surveying and mapping, in particular to a method and system for extracting the reflectivity of the seabed bottom of laser radar bathymetry data. Background technique [0002] The laser radar sounding system can quickly and efficiently measure the depth of shallow seas, submerged reefs and waters that cannot be reached by ships. It has the characteristics of high precision, wide range, high mobility, high measurement density, and short measurement cycle. 60 meters. The application prospect is very broad, and can be used in nautical chart production, hydrographic survey, underwater target, underwater aircraft, submarine, fish detection, seabed salvage, search and rescue and other fields. [0003] The use of airborne lidar for ocean detection is one of the most cutting-edge technologies in the field of marine surveying and mapping. The company's Hawkeye series, the Austrian Riegl company's VQ-820 se...

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Problems solved by technology

[0006] In view of the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a method and system for extracting the reflectivity of the seabed bottom of the laser radar bathymetry data, aiming at solving the problem of the laser beam emitted by the airborne laser radar in the prior art. The attenuation in seawater is very serious, affected by seawater scattering, pulse broadening, hot-spot effect, etc., it is not easy to extract the reflectance of the bottom of the seabed

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