Method and system for ship electromagnetic scattering prediction based on subdomain modeling

Abstract

The invention discloses a ship electromagnetic scattering prediction method and system based on sub-domain modeling. The method comprises the following steps: carrying out first region electromagnetic modeling to a fine structure scattering region of a ship by adopting a finite difference time domain method; for a big-scale conductor scattering region of the ship, carrying out second region electromagnetic modeling by adopting a time-domain physical-optic method; establishing a cross-coupling scattering correlation model among a multi-scale structure on the basis of a Kirchhoff surface integral through the equivalent source dispersing of a region boundary surface scattered field; and dispersing a pulse response interval to generate a uniform response sampling time sequence, and adopting a sequential transferring method to directly convert a secondary incident field value to a second region by a first region into time domain scattering waveform in a weighting way by taking each time step of time domain finite difference calculation as a uniform reference. The accuracy and reliability of ship electromagnetic scattering prediction can be improved through a classification modeling method.

Description

technical field [0001] The invention belongs to the field of target radar wave stealth design, and in particular relates to a ship electromagnetic scattering prediction method and system based on subdomain modeling, which can be applied to quantitative control of RCS indicators of large-scale complex targets such as ships and optimal design of radar wave stealth . Background technique [0002] The ship target is a platform composed of multi-scale structures, which not only exhibits macroscopic superelectric large wavelength size and relatively regular conductor structure characteristics, but also has complex local fine structure and material characteristics. When it is illuminated by detection radar waves, its scattered echoes are composed of multi-scale scattered echoes, which brings great difficulties to the identification of strong scattering sources and the prediction of RCS indicators in the overall stealth design. [0003] The accuracy of target electromagnetic scatte...

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Problems solved by technology

Theoretically, the full-wave method has the advantages of complete characterization of geometric and electromagnetic parameters, and can accurately model the electromagnetic scattering of composite structures. Computational resources are limited, and it is easy to cause iteration errors. When the full-wave method is difficult to meet the needs of engineering applications, at present, the optical approximation method is mainly used to simulate and predict the electromagnetic scattering characteristics of large-scale complex targets. Although this method has high computational efficiency , but it is usually suitable for electrically large-scale ideal conductor targets, and the simulation accuracy of local complex fine structures and materials cannot be guaranteed, which restricts the accuracy of scattered echo feature prediction

[0004] Retrieving domestic and foreign literature, the accurate prediction method of ship electromagnetic scattering based on domain division simulation modeling is still blank, the present invention provides a kind of ship electromagnetic scattering prediction method based on domain division modeling

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