Metal target transient electromagnetic scattering analysis method based on delay laguerre polynomials

Abstract

The invention discloses a metal target transient electromagnetic scattering analysis method based on delay laguerre polynomials. A target is subdivided through curved surface triangle surface elements. Spatial dispersion and time dispersion are carried out on a time domain mixed field integral equation through a CRWG primary function and the delay laguerre polynomials. A test is carried out through a galerkin method. An order-stepped matrix equation is finally formed, and the transient electromagnetic scattering characteristic of the target can be obtained through resolution of the equation and post-processing. As a delay item related to the spatial position of the target is introduced into a time primary function, the time primary function contains the spatial phase information of the target is adopted, and the target can be subdivided with less curved surface triangle surface elements. The unknown calculation amount is greatly reduced, consumption of an inner storage is effectively reduced, the calculation time is shortened, and important reference documents are provided for accurate analysis of the transient electromagnetic scattering characteristic of an electric large-size metal target.

Description

technical field [0001] The invention belongs to the field of electromagnetic fields and electromagnetic waves, in particular to a method for analyzing transient electromagnetic scattering of metal targets based on delayed Laguerre polynomials. Background technique [0002] In recent years, due to the urgent needs of short-pulse radar design, radar target recognition and other fields, the analysis of target transient electromagnetic scattering characteristics has aroused great research interest, and correspondingly, time-domain methods in computational electromagnetics have also received great attention. develop. The time-domain method can obtain broadband data in one simulation, while the frequency-domain method needs to calculate many frequency sampling points, and then obtain the limited-bandwidth time-domain data through Fourier inverse transform, the calculation amount is much larger; and the time-domain method directly gives the time-domain data Domain results can clea...

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Problems solved by technology

There are two main solutions to time-domain integral equations, namely the time-stepping method and the order-stepping method (Y.S.Chung, Y.J.Lee, J.H.So, J.Y.Kim, C.Y.Cheon, B.J.Lee, and T.K.Sarkar, “A stable solution of time domain electric field integral equation using weighted Laguerre polynomials,”Microw.Opt.Technol.Lett.,vol.49,no.11,pp.2789–2793,2007), compared with the time stepping method, the order stepping method has The characteristics of unconditional stability, but this method needs to consume more memory and computing time, which has become a development bottleneck of the order stepping method