A Simulation Method for Quickly Extracting Transient Scattering Signals of Electrically Large-Scale Metal Cavity Targets

Abstract

The invention discloses a simulation method for rapidly extracting transient scattered signals of an electric large-size metal cavity target. The simulation method includes creating a geometric model of the metal cavity target, and performing mesh dissection on the surface of the metal cavity target by a curved-surface triangular unit; determining a time domain integral equation of the metal cavity target; unfolding a surface induced current in the time domain integral equation by a high-order lamination divergence conformal basis function in terms of space and a time and space-time hybrid basis function in terms of time; substituting a surface induced current expression into the time domain integral equation, and testing a time domain electric field integral equation in a discrete form in terms of time and space respectively to acquire a system impedance matrix equation; solving the impedance matrix equation by a time stepping method, determining time domain current distribution on the surface of the conductor target, and acquiring broadband electromagnetic characteristic parameters of the target according to time domain current distribution to complete simulation. The method has the advantages of high simulation accuracy, less time used and low memory consumption, thereby having a broad application prospect.

Description

technical field [0001] The invention relates to the technical field of electromagnetic simulation, in particular to a simulation method for quickly extracting transient scattering signals of an electrically large-sized metal cavity target. Background technique [0002] Due to the military needs and the continuous development of modern science and technology, the analysis of the electromagnetic characteristics of large-scale targets with cavities has become an important research content. The scattering characteristics of the cavity structure are relatively complex, and often cannot be integrated with the cavity-containing target for calculation, and most military targets can be regarded as a cavity-containing target body, and the cavity part of the target body is often a strong scattering source , so it is of great significance to study the scattering results of the interaction between the inner cavity and the outer surface. [0003] In the frequency domain integral equation...

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Problems solved by technology

[0004] The above-mentioned documents 1 to 3 all report the method of analyzing the electromagnetic scattering characteristics of conductor targets and metal cavities in the frequency domain using phase basis functions. However, due to the resonance phenomenon and the existence of high and low frequency components, the calculation methods at different frequency points are also different, resulting in The calculation is huge and complex, and the field interaction cannot be understood intuitively from the simulation results, which makes the frequency domain method lose its advantage

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