A Method for Decomposing Full Waveform Data of Spaceborne Large Spot LiDAR

Abstract

The invention discloses a method for decomposing full waveform data of a spaceborne large-spot laser radar. The method includes the following steps: step S1, preprocessing each original echo waveform data included in the full waveform data of a spaceborne large-spot laser radar, Obtain the filtered echo waveform; step S2, detect the obvious peak point and the inflection point corresponding to the obvious peak point in the filtered echo waveform, and estimate the initial value of the parameter of the Gaussian component corresponding to the effective peak point ; Step S3, detecting the superimposed Gaussian components on both sides of the effective obvious peak point, and estimating the initial value of the parameters of the superimposed Gaussian components; Step S4, updating the total number of Gaussian components detected in the filtered echo waveform and The parameters of the Gaussian components are optimally estimated. The invention combines inflection point matching and iterative optimization algorithm to improve the initial detection strategy of the Gaussian component, and obtains a better initial estimation of the Gaussian component of the echo waveform.

Description

technical field [0001] The invention relates to the technical field of space-borne laser altimetry data processing, in particular to a method for decomposing full-waveform data of a space-borne large-spot laser radar. Background technique [0002] The full-waveform laser radar technology can record the complete waveform information of the echo pulse of the ground object. By analyzing the backscattering waveform, the physical properties of the ground object including the laser foot point can be obtained, reflecting the vertical distribution characteristics of the ground object. With the development of lidar technology, spaceborne full-waveform lidar technology has become an effective means of active earth observation. In 1999, NASA designed an airborne large-spot laser altimeter system LVIS (Laser Vegetation Imaging Sensor), which can digitally sample laser emission pulses and echo pulses, and obtain sub-canopy and canopy topographic data. In 2003, NASA launched the first ic...

AI Technical Summary

Problems solved by technology

[0006] In view of the above problems, the present invention provides a method for decomposing full waveform data of spaceborne large-spot lidar, which solves the problem of decomposition of full waveform data of spaceborne lidar under different types of ground coverage, especially the superimposed waveform in the received waveform data , the detection and decomposition of complex multi-peak waveforms and weak echo waveforms, in order to improve the extraction accuracy of waveform characteristic parameters of ground objects, and then improve the extraction accuracy of satellite laser elevation control points and the accuracy of surface object parameter inversion

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