A Fast Method for Solving the Electromagnetic Scattering Characteristics of Locally Varying Targets
A technology of electromagnetic scattering characteristics and changing targets, which is applied in the field of quickly solving the electromagnetic scattering characteristics of locally changing targets, can solve the problems that limit the application of traditional method of moments, and achieve the goals of reducing computational complexity, wide application range, and reducing computing time requirements Effect
Active Publication Date: 2018-09-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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However, the complexity of the direct solution of the traditional method of moments is O(N 3 ), where N is the number of unknowns, such a high complexity limits the application of the traditional method of moments in calculating electrically large objects
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[0024] Below in conjunction with accompanying drawing, the implementation of technical scheme is described in further detail:
[0025] as attached figure 1 As shown, the present invention mainly solves the problem of rapid analysis of electromagnetic scattering of conductor targets with multiple partial modifications, such as the landing gear is lowered before and during takeoff of an aircraft, and the landing gear is retracted after takeoff. The present invention is called a method for quickly solving the electromagnetic scattering characteristics of locally changing targets, which includes the following 6 steps:
[0026] Step 1: The average side length of the triangular facet is 0.1λ, where λ is the wavelength of the incident plane wave. The RWG basis functions f defined on the common edges of the triangular mesh n (r):
[0027]
[0028] In the formula, and Indicates the positive triangle surface and the negative triangle surface corresponding to the nth basis func...
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The invention discloses a method for rapidly solving electromagnetic scattering characteristics of a locally changing target. The method comprises: firstly, obtaining a target total impedance matrix and an inverse matrix thereof, and expressing the target total impedance matrix and the inverse matrix in a block matrix form; then, using a block matrix inversion formula to obtain a relational expression of an impedance matrix of the rest unchanged part and the inverse matrix thereof; then, using a Sherman-Morrison-Woodbury formula to express an induced current matrix of the rest part in a form related to the inverse matrix of the total impedance matrix and a voltage matrix. Through the method of rapidly solving the induced current of the unchanged part which is remained after removing a small part of a conductor target, efficiency of analyzing electromagnetic scattering characteristics of a target is effectively improved. The method is suitable to be used for analysis of electromagnetic problems when the target has multiple local changes, for example, solving a problem of electromagnetic scattering before and after an airplane undercarriage is geared up when an airplane takes off.
Description
technical field [0001] The invention relates to a method for quickly solving the electromagnetic scattering characteristics of a locally changing target, in particular to a technology for rapidly inverting an impedance matrix after a target conductor is locally changed. Background technique [0002] The electromagnetic scattering problem of TVU targets has been widely concerned by scholars at home and abroad. The Method of Moments (MoM) converts the electromagnetic integral equation into a matrix equation, which is an effective way to calculate the scattering characteristics of the target. However, the complexity of the direct solution of the traditional method of moments is O(N 3 ), where N is the number of unknowns, such a high complexity limits the application of the traditional method of moments in calculating electrically large objects. [0003] In practical electromagnetic engineering problems, it is often necessary to make multiple local modifications to the model s...
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IPC IPC(8): G06F17/11G06F17/16
CPCG06F17/11G06F17/16
Inventor 陈新蕾张杨费超李茁顾长青
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS