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Airborne laser sounding echo signal processing method based on multiple physical fields

A technology of echo signal and airborne laser, which is applied in the direction of measuring device, electromagnetic wave re-radiation, radio wave measurement system, etc. It can solve the problem of large noise of echo signal and difficulty in accurately determining the position of echo signal on the seabed and sea surface, etc. problem, to achieve the effect of sounding

Inactive Publication Date: 2019-12-13
QINGDAO TECHNOLOGICAL UNIVERSITY
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Problems solved by technology

[0004] In the process of airborne laser sounding, the laser signal needs to go through eight kinds of transmission processes, such as the atmosphere, seawater, and seabed. Therefore, a large amount of noise will be introduced into the received echo signal, making it difficult to accurately determine the seabed and sea surface echoes. The position of the signal, which is also a hot spot and difficulty in the field of marine surveying and mapping today

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  • Airborne laser sounding echo signal processing method based on multiple physical fields
  • Airborne laser sounding echo signal processing method based on multiple physical fields
  • Airborne laser sounding echo signal processing method based on multiple physical fields

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Embodiment 1

[0021] Embodiment one, such as Figure 1-3 As shown, the present invention is based on the multi-physics field airborne laser sounding echo signal processing method is to couple the Darcy seepage equation with the nonlinear diffusion equation, replace the geometric properties of the echo signal with the physical properties of the echo signal, and use the local The physical properties construct the point spread function, and the received echo signal is used as the permeability of the porous medium. In the mathematical model, it is shown as the coupling of multiple equations under the condition of satisfying the initial boundary value, and the result of signal processing is the overall weak solution of the evolution equations in space.

[0022] This embodiment receives signal u 0 images such as figure 2 As shown, the data processing effect diagram is as follows image 3 As shown, the sounding purpose can be achieved according to the time position of the sea surface and sea b...

Embodiment 2

[0034] Embodiment two, such as figure 1 and 3 -4, the present invention is based on the processing method of the airborne laser sounding echo signal of multiphysics field is to be to Darcy seepage equation and nonlinear diffusion equation coupling, replace the geometrical property of echo signal with the physical property of echo signal, utilize The local physical properties construct the point spread function, and the received echo signal is used as the permeability of the porous medium. In the mathematical model, it is shown as the coupling of multiple equations under the condition of satisfying the initial boundary value, and the result of signal processing is the overall weak solution of the evolution equations in space.

[0035] This embodiment receives the signal u' 0 images such as Figure 4 As shown, the data processing effect diagram is as follows Figure 5 As shown, the purpose of sounding can be achieved according to the time position of the sea surface and bottom...

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Abstract

The invention relates to an airborne laser sounding echo signal processing method based on multiple physical fields, and aims at solving the problem that sea surface and seabed echo signals cannot beaccurately found in the prior art. A Darcy seepage equation is coupled with a nonlinear diffusion equation, the physical property of an echo signal is used for replacing the geometrical property of the echo signal, a point diffusion function is constructed by utilizing the local physical property, and the received echo signal is used as the permeability of a porous medium. Coupling of a pluralityof equations under the condition of meeting initial boundary values is shown on a mathematical model, and a signal processing result is an overall weak solution of an evolution equation set in space.The method has the advantages that the sea surface and seabed echo signal positions can be accurately determined, so that depth measurement is realized.

Description

technical field [0001] The invention relates to a laser sounding echo signal processing method, in particular to a multi-physics-based airborne laser sounding echo signal processing method. Background technique [0002] Airborne LIDAR Bathymetry (ALB) is widely used in the field of marine surveying and mapping because of its good flexibility, fast speed and high measurement accuracy, and the water depth and topographic measurement of near-shore shallow seas are the most basic tasks of marine surveying and mapping. one. ALB is mainly composed of an on-board blue-green laser transmitting / receiving system and a ground data post-processing system. The laser transmitter emits high-power, narrow-pulse laser light to detect seabed depth and underwater targets. Obtain the seabed reflection signal by emitting blue-green light (wavelength 532nm) with strong penetrating ability to water bodies, and obtain elevation by emitting infrared light (wavelength 1064nm) that is strongly refle...

Claims

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Application Information

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IPC IPC(8): G01S7/48G01S17/08G01S17/88
CPCG01S7/4802G01S17/08G01S17/88
Inventor 滕晓杰岳军李宏升高洪秀冯宝成刘尊年姜铄
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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