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Research On Modeling Of Electromagnetic Scattering Characteristics Of Low Altitude Targets

Posted on:2019-06-07Degree:MasterType:Thesis
Country:ChinaCandidate:J X MaFull Text:PDF
GTID:2348330569487766Subject:Electromagnetic field and microwave technology
Abstract/Summary:PDF Full Text Request
There is a strong coupling between the low-altitude target and the environment in which it is located.The scattering characteristics of the target have a greater change than when the target is in free space,and the echo signal of the target may be affected by the clutter signal due to the effect of multipath,this will seriously affect the radar's ability to detect low-altitude targets.Therefore,it is necessary to carry out compound modeling of low-altitude targets and the environment to study their scattering properties and to study methods for combating multipath effects.Based on this article following work is done:In this paper,the research progress and research methods of the composite scattering of random rough surface and its upper target are introduced firstly.The research progress of the Brewster effect is introduced,and according to the analytical method,numerical method and the classification of the high frequency approximation method analyzing electromagnetic scattering analysis method are introduced,introduced the basic principle of the random rough surface of the scene modeling and the generating steps.Then,through the detailed description of three parts of ray tracing,field intensity tracking and scattering field calculation,the basic principle of bouncing ray method in high frequency approximation method is introduced,and on this basis,joined the KD-tree acceleration technique and PO integral calculation method,improve the computing speed of the bounce ray method.The use of the bouncing ray method to study the scattering field of composite targets composed of some targets,targets and the environment,combined the "four-path" model with the ray tracing part of the bouncing ray method,and classifies the ray tube ejection paths.The analysis of each path in the "four-path" model is realized.The compound target is analyzed using the "four-path" model to explore the effect of each path on the scattering field under different incident frequencies and different environmental parameters and the specific mechanism of the coupling between low-altitude targets and the environment.Finally,applying the generalized Brewster effect to combat multipath interference,the relationship between the Brewster's angle and the parameters of the spatial medium was explored on the basis of the parallel-polarized-wave incident flat surface problem,Then we extended the Brewster effect of the rough surface and the generalized Brewster effect of the compound target composed of the rough surface and the upper target,and obtained the incident angle to reduce the effect of multipath.
Keywords/Search Tags:low altitude target electromagnetic scattering, ray method, brewster angle, random rough surface, four path
PDF Full Text Request
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