Method for obtaining radar cross section (RCS) of homogeneous bi-isotropic medium object

A radar cross-section and isotropic technology, applied to radio wave measurement systems, instruments, etc., can solve problems such as late-time oscillations, unstable high-frequency oscillations, etc., and achieve low cost and flexible models

Inactive Publication Date: 2012-06-20
郑州微纳科技有限公司
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  • Application Information

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Problems solved by technology

The mainstream time-domain integral equation is solved by time step (MOT). However, according to the research surface, there will be unstable high-frequency oscillation phenomenon in the later stage of time step (MOT), that is, late-time oscillation

Method used

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  • Method for obtaining radar cross section (RCS) of homogeneous bi-isotropic medium object
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  • Method for obtaining radar cross section (RCS) of homogeneous bi-isotropic medium object

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Embodiment 1

[0174] Such as figure 2 As shown, the double isotropic medium sphere 2, the background medium is free space 1, the radar incident electromagnetic wave 3 is incident along the Z-axis direction; the incident electromagnetic wave adopts the form of Gaussian pulse:

[0175] E → i ( r → , t ) = 4 E → 0 e - γ 2 / ( π T )

[0176] H → i ( r → , t ) = k ...

Embodiment 2

[0181] Such as Figure 9 As shown, electromagnetic scattering is performed on a uniform biisotropic cylinder to detect the radar scattering cross section of the scattering field; the radius of the cylinder is 0.02m, the height is 0.04m, and the relative permittivity ε r =4.0, relative permeability μ r = 1.0, κ r =0.3, χ r = 0.5; the radar incident electromagnetic wave is the same as that of Embodiment 1; the surface of the cylinder is divided into 610 triangular pieces and 915 unknown quantities by adopting triangular mesh division; the value of M is 120. The calculation result of the time domain integration method of the present invention is compared with the frequency integration method: Figure 10 is the bistatic radar cross section of the main polarization of cylindrical scattering, the horizontal axis represents the θ angle, and the vertical axis represents the radar cross section; Figure 10 It shows that the calculation results of the bistatic radar cross section of...

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Abstract

The invention relates to the field of electromagnetic wave and radar monitoring and provides a method for obtaining radar cross section (RCS) of a homogeneous bi-isotropic medium object. The method comprises the following steps of: building a geometrical model of the homogeneous bi-isotropic medium object and dividing the surface of the model into a plurality of triangular patches in seamless connection; introducing a planar power source vector function and a planar magnetic source vector function; applying a field decomposition method in the homogeneous bi-isotropic medium object; obtaining a boundary integral equation on the surface of a scatterer according to the boundary conditions; applying a moment method to carry out numerical solution on the boundary integral equation, including space test and time test; adopting RWG (Rao-Wilton-Glisson) basis functions as the spatial basis function and test function and adopting Laguerre functions with amplitude factors as the temporal basis function and test function; and obtaining electromagnetic scattering of an observation point according to the equivalence principle and then applying Fourier transform to obtain the RCS. The method has the following advantages that: the obtained scattered field of the homogeneous bi-isotropic medium object is stable; and the RCS with wide frequency range can be obtained.

Description

technical field [0001] The invention relates to the technical field of electromagnetic wave and radar monitoring, in particular to a method for obtaining a radar scattering cross section of a uniform biisotropic medium object. Background technique [0002] Biisotropic medium is a special kind of complex medium, and current source or magnetic current source excites biisotropic medium to produce electric field polarization and magnetic field polarization simultaneously. Chiral media and Tellegen media are two subclasses of biisotropic media. The chiral medium has optical activity, and the polarization plane is rotated when the electric field wave passes through the chiral medium. Studies have shown that chiral media are reciprocal, while Tellegen media are non-reciprocal. Biisotropic media have great potential applications in microwave and millimeter microwave fields, such as radome, chiral microstrip antenna, mode converter, and polarization rotator. In the field of modern...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
Inventor 卞红河邹志粘袁志巍章秀银
Owner 郑州微纳科技有限公司
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