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Electromagnetic scattering property simulating method based on cylindrical surface equivalent source domain decomposition

A technology of electromagnetic scattering characteristics and area decomposition, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as complex operation steps, increased computing resource overhead, and multiple dimensions, achieving theoretical reliability and easy implementation , cost-saving effect

Active Publication Date: 2013-07-31
NANJING UNIV OF SCI & TECH
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Problems solved by technology

W.-D.Li, W.Hong, and H.-X.Zhou proposed an overlapping domain decomposition method for integral equations (W.-D.Li, W.Hong, and H.-X.Zhou, "Integral equation-based overlapped domain decomposition method for the analysis of electromagnetic scattering of 3D conducting objects,” Microwave and Optical Technology Letters, vol.49, no.2, pp.265-274, 2007.), M.K.Li, and W.C.Chew proposed Domain decomposition method based on equivalence principle (M.K.Li, and W.C.Chew, "Wave-Field Interaction With Complex Structures Using Equivalence Principle Algorithm," Antennas and Propagation, IEEE Transactions on, vol.55, no.1, pp.130- 138,2007.), P.Zhen, W.Xiao-Chuan, and L.Jin-Fa proposed a non-overlapping region decomposition method (P.Zhen, W.Xiao-Chuan, and L.Jin-Fa, "Integral Equation Based Domain Decomposition Method for Solving Electromagnetic Wave Scattering From Non-Penetrable Objects, "Antennas and Propagation, IEEE Transactions on, vol.59, no.9, pp.3328-3338, 2011.), these methods are based on integral Based on the equation method, they decompose the original big problem into small problems to solve, but due to the large number of dimensions of the problem, the overhead of computing resources is increased, and the operation steps are more complicated

Method used

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  • Electromagnetic scattering property simulating method based on cylindrical surface equivalent source domain decomposition
  • Electromagnetic scattering property simulating method based on cylindrical surface equivalent source domain decomposition
  • Electromagnetic scattering property simulating method based on cylindrical surface equivalent source domain decomposition

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Embodiment 1

[0142] According to the method of the present invention, the electromagnetic scattering characteristics of the model missile model are simulated by using the method of the present invention.

[0143] The shape and size of a certain type of missile model, such as Figure 4 Shown. The projectile has a diameter of 2m and a projectile length of 24m. The body of the projectile has a rotationally symmetrical structure, and the rudder is an arbitrary structural part. The working frequency is: 300MHz, and the incident angle is incident from the direction of the warhead (0 0 ,0 0 ), Vertical polarization. Create a cylinder with a radius of 4.1m and a height of 25m to surround the projectile. Cross-cut the cylindrical surface at 5.0m intervals into 5 equal parts, such as Figure 5 Shown. Each sub-cylinder has the same structure, and the line segment division and triangular basis function division of the busbar are established for one of them, and the information is shared to other cylind...

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Abstract

The invention discloses an electromagnetic scattering property simulating method based on cylindrical surface equivalent source domain decomposition. The method comprises the following steps of: establishing a model, dividing sub-regions and dissecting; opening electromagnetic current on each sub equivalent cylindrical surface and each sub scatterer, and determining the basic function coefficient of the equivalent incident electromagnetic current on each sub equivalent cylindrical surface; converting the basic function coefficient of the equivalent incident electromagnetic current on the sub equivalent cylindrical surface of a non-rotational symmetrical body into an RWG (Vector Triangle Basis Function) coefficient; determining an incident electric field generated on the surface of the corresponding sub scatterer by the equivalent incident electromagnetic current on each sub equivalent cylindrical surface, and determining scattering current on the surface of the sub scatterer in each sub-region; determining the scattering electromagnetic current on each sub equivalent cylindrical surface, taking the scattering electromagnetic current as the incident current of any other sub-region, and updating the scattering electromagnetic current coefficient on each sub equivalent cylindrical surface until the scattering electromagnetic current coefficient is balanced; and determining the radar scattering sectional area of a far field to finish the electromagnetic scattering property simulation. The invention provides a stable and efficient electromagnetic simulating method suitable for metal targets with any shapes.

Description

Technical field [0001] The invention relates to the technical field of electromagnetic simulation, in particular to a simulation method of electromagnetic scattering characteristics based on cylindrical equivalent source domain decomposition. Background technique [0002] A rotationally symmetric body refers to a three-dimensional object that is rotationally symmetric about an axis. Due to its structural characteristics, it can be expanded by a local global basis function, and the rotationally symmetric body moment method is used for rapid analysis and calculation (M.Andreasen, "Scattering from bodies of revolution, "Antennas and Propagation, IEEE Transactions on, vol. 13, pp. 303-310, 1965.), compared with the traditional method of moments based on RWG basis functions (Rao, SM; Wilton, D.; Glisson, AW, Electromagnetic scattering by surfaces of arbitrary shape, "Antennas and Propagation, IEEE Transactions on, vol. 30, no. 3, pp. 409, 418, May1982) greatly saves computing resource...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 陈如山丁大志樊振宏苏婷
Owner NANJING UNIV OF SCI & TECH
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