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Method for determining seawater depth by decomposing laser radar waveform based on LM algorithm

A technology of laser radar and LM algorithm, which is applied in the direction of measuring the depth of open-air water sources, surveying of open-air water sources, radio wave measurement systems, etc., can solve the problems of slow convergence speed of EM algorithm and achieve the effect of reducing the complexity of the algorithm

Active Publication Date: 2017-03-15
TIANJIN UNIV
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Problems solved by technology

The traditional method uses the EM (Expectation Maximization) algorithm to decompose the waveform, but the EM algorithm has problems such as slow convergence speed

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  • Method for determining seawater depth by decomposing laser radar waveform based on LM algorithm
  • Method for determining seawater depth by decomposing laser radar waveform based on LM algorithm
  • Method for determining seawater depth by decomposing laser radar waveform based on LM algorithm

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Embodiment Construction

[0050] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, and the described specific embodiments are only for explaining the present invention, and are not intended to limit the present invention.

[0051] The present invention proposes a method based on the LM algorithm to decompose the laser radar waveform to determine the depth of sea water, and its design idea is as follows figure 1 As shown, after the echo waveform is obtained, the echo waveform decomposition operation is performed, that is, firstly, the waveform is denoised and smoothed; then, the initial waveform parameters are set according to the echo waveform; secondly, the LM algorithm is used to fit the The parameters are adjusted each iteration, and when the iterative calculation meets the end condition, the optimal parameters are obtained; finally, the echo waveform is decomposed into the sea surface wav...

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Abstract

The invention discloses a method for determining seawater depth by decomposing a laser radar waveform based on an LM algorithm. The method mainly comprises the steps of conducting echo waveform decomposition operation after obtaining an echo waveform, that is, firstly, conducting noise reduction and smoothing processing on the waveform; then, setting initial wave parameters according to the echo waveform; next, adjusting the parameters during each time of iteration through LM algorithm fitting, and when iterative computation matches conditions and finishes, solving an optimal parameter; finally, decomposing the echo waveform into a sea surface waveform and a sea bottom waveform, and further solving the seawater depth. According to the method for determining the seawater depth by decomposing the laser radar waveform based on the LM algorithm, the optimal parameter can be obtained, decomposition of the sea surface waveform and the sea bottom waveform is achieved, and complexity of the algorithm is sharply reduced. On the condition that a sea surface echo is very close to a sea bottom echo, the sea surface waveform and the sea bottom waveform can still be decomposed.

Description

technical field [0001] The invention relates to a method for processing laser radar echo waveform data, which is a method for realizing laser radar waveform data decomposition through an LM algorithm, and belongs to the technical field of airborne laser radar. Background technique [0002] Bathymetry is an important part of oceanographic mapping. Although the traditional ship-borne multi-beam echo sounding method has high measurement accuracy, it cannot enter shallow coastal areas and areas with dense reefs. In recent years, the emergence and development of airborne lidar has filled the gap in bathymetry technology in coastal shallow water areas, and has become a fast and efficient method for detecting water depth and seabed topography. The airborne lidar detection system can be widely used in many fields such as marine hydrographic survey (including seawater depth measurement, seabed landform surveying and seawater optical parameter telemetry, etc.), mine and fish detectio...

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Application Information

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IPC IPC(8): G01C13/00G01S7/48
CPCG01C13/008G01S7/4802
Inventor 赵毅强刘尚典刘沈丰胡凯薛文佳
Owner TIANJIN UNIV
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