Unknown wall parameter estimation method based on electromagnetic transmission coefficient
A transmission coefficient and parameter estimation technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of limitation, prediction accuracy is relatively greatly affected by target size, position and shape changes, and achieve the effect of accurate medium parameters
Active Publication Date: 2017-10-27
NANJING UNIV OF INFORMATION SCI & TECH
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However, this algorithm completely depends on the delay estimation, and the precision parameter of the estimation result may be limited by the precision of the delay estimation
In addition, wall parameters can also be predicted by the wall parameter regression method based on vector machine (SVM). This method is almost not affected by the number of targets, wall length, sampling interval and noise, but the prediction accuracy is affected by Relatively large influence of position and shape changes
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[0053] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.
[0054] Step 1. Refer to figure 1 , establish a wall model with three layers of medium, the first medium layer and the third medium layer are air, respectively located on both sides of the second medium layer, the second medium layer is an isotropic uniform wall, which is the medium to be tested layer, the thickness of the wall is d, and the relative permittivity is ε r . The transmitting antenna and the receiving antenna are placed on both sides of the wall, and are respectively at the same distance from the front surface and the rear surface of the wall.
[0055]According to the model, the simulation experiment is carried out. The transmitted ...
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The invention discloses an unknown wall parameter estimation method based on an electromagnetic transmission coefficient, and the method comprises the steps: building a three-layer dielectric wall model, wherein the first and third dielectric layers are respectively located at two sides of the second dielectric layer, and the second dielectric layer is a to-be-measured dielectric layer; arranging a transmitting antenna on the first dielectric layer, and arranging a receiving antenna on the third dielectric layer, wherein the distance between the transmitting antenna and the front surface of the second dielectric layer is equal to the distance from the receiving antenna and the rear surface of the second dielectric layer; enabling the transmitting antenna to transmit an electromagnetic wave, and enabling the receiving antenna to receive the electromagnetic wave transmitted by the transmitting antenna; deducing an amplitude attenuation coefficient according to the propagation characteristics of the electromagnetic wave; calculating the propagation time delay of the electromagnetic wave; and estimating the parameters of the second dielectric layer according to the amplitude attenuation coefficient and the propagation time delay of the electromagnetic wave. Compared with a conventional method, the method can achieve the more accurate estimation of the dielectric parameters.
Description
technical field [0001] The invention belongs to the technical field of through-wall radar imaging, in particular to a method for estimating unknown wall parameters based on electromagnetic wave transmission coefficient. Background technique [0002] UWB wall-penetrating radar is a non-destructive detection radar, which has the characteristics of high distance resolution and strong penetrating ability. It can use electromagnetic waves to penetrate non-metallic wall media such as earth walls, wooden walls, brick walls, and concrete walls to detect and image the human body or the internal structure of buildings behind the wall. In recent years, whether in military or civilian, through-wall radar has been widely used. [0003] When the through-wall radar is used to detect the target behind the wall, when the electromagnetic wave is incident on the wall, reflection and transmission will occur at the junction of the air and the wall. The ability of electromagnetic waves to penet...
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IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 李家强朱江陈金立朱艳萍
Owner NANJING UNIV OF INFORMATION SCI & TECH