A single-band blue-green laser waveform analysis method and system for shallow water bathymetry

Abstract

The invention discloses a single-band blue-green laser waveform analysis method and system for shallow water sounding. The method uses a Gaussian function to model the sounding waveform information after filtering, denoising and smoothing. Gaussian decomposition determines the position of the initial Gaussian component, determines the category of the component according to the detected left and right inflection points of the wave peak, estimates the initial parameters respectively, and compares the Gaussian component width with the pulse width threshold of the system waveform. After removing the invalid initial Gaussian component, further Optimize the parameters and number of Gaussian components, and perform nonlinear least square method iterations to decompose the waveform data accurately. It has the following advantages: It can effectively decompose and classify the superimposed wave and weak wave components in the echo signal, adopt threshold limit and loop iteration, improve the accuracy of the peak point of the water surface and bottom, and effectively measure the depth of shallow water.

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.

Images