Satellite-borne large-spot laser radar full-waveform data decomposition method

Abstract

The invention discloses a satellite-borne large-spot laser radar full-waveform data decomposition method. The method comprises the following steps of: S1, carrying out the preprocessing of each pieceof original echo waveform data contained in satellite-borne large-spot laser radar full-waveform data to obtain a filtered echo waveform; S2, detecting an obvious peak point in the filtered echo waveform and an inflection point corresponding to the obvious peak point, and estimating an initial value of a parameter of a Gaussian component corresponding to an effective peak point; S3, detecting superposed Gaussian components on two sides of the effective obvious peak point, and estimating parameter initial values of the superposed Gaussian components; and S4, updating the total number of Gaussian components detected in the filtered echo waveform, and carrying out optimal estimation on parameters of the Gaussian components. According to the method, inflection point matching and an iterative optimization algorithm are combined, the initial detection strategy of the Gaussian component is improved, and good Gaussian component initial estimation of the echo waveform is obtained.

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...

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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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