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Inversion method of airport pavement medium layer electromagnetic property based on system identification theory

A technology of system identification and electromagnetic characteristics, applied in the direction of electromagnetic measuring device, electric/magnetic thickness measurement, electric variable measurement, etc., can solve the problem of inversion of time delay and thickness of thin-layer echo and improve estimation The effect of precision

Inactive Publication Date: 2012-06-13
CIVIL AVIATION UNIV OF CHINA
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Problems solved by technology

Therefore, based on this method, the inversion of the echo time delay and its thickness of the thin layer cannot be obtained.

Method used

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  • Inversion method of airport pavement medium layer electromagnetic property based on system identification theory
  • Inversion method of airport pavement medium layer electromagnetic property based on system identification theory
  • Inversion method of airport pavement medium layer electromagnetic property based on system identification theory

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Embodiment Construction

[0016] The inversion method of the electromagnetic properties of the medium layer of the airport pavement based on the system identification theory provided by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] Such as figure 1 As shown, the inversion method of the electromagnetic properties of the airport pavement medium layer based on the system identification theory provided by the present invention includes the following steps carried out in order:

[0018] (1) Establish the transmission model of electromagnetic wave transmission in the medium layer of the airport pavement, and obtain the simulated echo signal of the ground penetrating radar in the layered medium;

[0019] When the electromagnetic wave emitted by the ground penetrating radar antenna reaches the airport pavement, its wave front can be approximately regarded as a plane, and when the distance between the transmitting and recei...

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Abstract

The invention discloses an inversion method of an airport pavement medium layer electromagnetic property based on a system identification theory. The invention mainly relates to estimation of an airport pavement structure layer dielectric constant, conductivity and a thickness. The method is characterized by: firstly establishing a transmission model transmitted by an electromagnetic wave in the pavement structure layer, wherein an influence of each frequency component in an emission bandwidth on a medium-layer dielectric-constant imaginary part is considered in the transmission model; simultaneously introducing super-resolution parameter estimation WRELAX algorithm to estimate time delay generated when a radar receives an echo signal so that the inversion of the airport pavement structure layer electromagnetic property can be realized based on the system identification theory. In the invention, the estimation of the pavement medium layer dielectric constant, the conductivity and the thickness in the airport pavement structure which contains a levelling thin layer and does not contain the levelling thin layer can be realized respectively. Simultaneously, estimation precision of the medium layer dielectric constant can be increased and a key problem in airport pavement detection can be solved. Therefore, the method has important significance for guaranteeing airport safety operation.

Description

technical field [0001] The invention belongs to the technical field of airport pavement non-destructive testing, and in particular relates to an inversion method for electromagnetic characteristics of an airport pavement medium layer based on system identification theory. Background technique [0002] The electromagnetic characteristics, thickness and void condition of the airport pavement medium layer are important factors to evaluate the quality of the airport pavement. Ground Penetrating Radar (GPR), as a high-resolution, high-precision, high-speed non-destructive detection technology, has been widely used in the evaluation of pavement conditions, tracking pavement changes, and detecting pavement diseases. The calculation of the structural layer thickness of airport pavement is an important application of ground penetrating radar in the detection of airport pavement. In order to accurately calculate the thickness of the medium layer under the pavement and the depth of th...

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Application Information

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IPC IPC(8): G01R27/26G01R27/02G01B7/06
Inventor 何炜琨吴仁彪刘家学
Owner CIVIL AVIATION UNIV OF CHINA
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