Method and system for determining initial value of effective signal of airborne lidar bathymetry received waveform

Abstract

The invention relates to a method and a system for determining an initial value of an effective signal of an airborne lidar bathymetry received waveform. The method comprises the steps of: obtaining awaveform to be processed, and taking the global maximum value point of the waveform as an initial value tS0 of a water surface echo signal position; and taking the maximum value in a set range near the extreme point of the first derivative of the waveform as the initial value tB0 of the water bottom echo signal position. According to the scheme, the maximum value detection is combined with the finding that the first derivative extreme value is always associated near the effective signal, so that the accuracy of determining the effective signal is improved. Meanwhile, the intensity of atmospheric scattering and water body backscattering is far less than that of water surface reflection, so that a waveform global maximum value point can be considered as an initial value of the water surfaceecho signal position.

Description

technical field [0001] The invention relates to a method and system for determining an initial value of an effective signal of an airborne laser sounding received waveform, and belongs to the technical field of airborne laser sounding. Background technique [0002] Bathymetry is of great significance to the management and development of rivers, lakes and oceans. Sonar sounding is the mainstream sounding method at present, but the measurement range is limited by the traffic capacity of ships, so it is not suitable for shallow water measurement. Airborne lidar bathymetry (ALB) can achieve fast, intensive and accurate measurements in shallow waters, and has been widely used in the production of ocean depth maps, shallow water monitoring, underwater target detection, and three-dimensional points of underwater terrain. fields such as cloud generation (Liu et al., 2011). The principle of ALB technology is to use the blue-green laser (532nm) with strong penetrability to the water...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method and system for determining the initial value of the effective signal of the receiving waveform of the airborne laser sounding, which is used to solve the problem of high error rate, serious interference of false signals, and problems in determining the initial value of the effective signal of the receiving waveform in the prior art. Water backscatter interference and poor adaptability

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