Single-waveband blue-green laser waveform analysis method and system for shallow water sounding

Abstract

The invention discloses a single-waveband blue-green laser waveform analysis method and system for shallow water sounding. The method includes: adopting a Gaussian function to model depth sounding waveform information subjected to filtering, denoising and smoothing; determining an initial Gaussian component position by utilizing Gaussian decomposition with energy from top to bottom; determining the type of a component according to the detected left and right inflection points of a wave crest, estimating initial parameters respectively, comparing the width of a Gaussian component with a systemwaveform pulse width threshold, further optimizing the parameter and number of the Gaussian component after removing invalid initial Gaussian component, and performing nonlinear least square iterationto accurately decompose waveform data. The method has the advantages that superposed wave and weak wave components in echo signals can be effectively decomposed and classified, threshold limitation and loop iteration are adopted, the accuracy of water surface and water bottom peak points is improved, and the shallow water depth is effectively measured.

Description

technical field [0001] The invention relates to a method for laser radar to measure shallow water depth, in particular to a waveform analysis method for small spot single-band LiDAR sounding waveform data, in particular to a single-band blue-green laser waveform analysis method for shallow water sounding and system. Background technique [0002] my country's sea area is vast, and the shallow sea area with a water depth of less than 50 meters is 500,000 square kilometers. Shallow sea terrain data is an important basic geospatial information required for applications such as shallow sea environmental governance, shallow sea resource development and utilization, shallow sea navigation, and island landing operations. Therefore, Shallow water offshore surveying and mapping is of great strategic significance. [0003] At present, the means used for shallow water bathymetry mainly include shipborne sonar, optical remote sensing and lidar. Shipborne sonar is an electronic device th...

AI Technical Summary

Problems solved by technology

The waveform processing method of water lidar is different from that of land lidar, and it is more complicated. Because the laser propagates in the water medium, the refraction of the water-air interface will occur, which is affected by the attenuation of water particles and the backscattering of the laser in the water, resulting in pulse broadening.

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