Decomposition method for electromagnetic scattering mechanisms

Abstract

The invention relates to a decomposition method for electromagnetic scattering mechanisms, and relates to the field of electromagnetic scattering. The method comprises the steps that a target is subjected to scattering calculation to obtain a target total scattering field, the obtained total scattering field is subjected to time-frequency analysis, the distribution of different scattering mechanisms in the target scattering field is observed, a multi-resolution technology is adopted for decomposing and recognizing the scattering mechanisms, and then the scattering mechanisms and scattering characteristics are reorganized and reconstructed. By means of the decomposition technology for the scattering mechanisms, a special electromagnetic environment or a scattering source is subjected to scattering mechanism decomposition and recognition, a formation mechanism of the electromagnetic environment can be judged, different components of the scattering source are defined, a basis is providedfor the reconstruction or modification of the electromagnetic environment or the scattering source, a trailing smear interference and false scattering center formed by a complex target coupling effectcan be recognized and removed by means of the method, and the method is used for target recognition based on radar images and can significantly improve the recognition accuracy.

Description

technical field [0001] The invention relates to an electromagnetic scattering mechanism decomposition method, belonging to the field of electromagnetic scattering. Background technique [0002] When electromagnetic waves irradiate complex targets, the smooth surface of the target will produce specular scattering contributions, discontinuous structures such as spires and edges will produce diffraction contributions, and concave structures will have electromagnetic coupling effects or multiple scattering contributions. In addition, there are also There are scattering contributions from different mechanisms such as surface waves and creeping waves. Although high-frequency scattering algorithms can distinguish between several common types of scattering mechanisms, such as physical optics (PO) for specular scattering contributions, diffraction theory (GTD or PTD) or equivalent electromagnetic currents (MEC) for edge scattering contributions , multiple scattering contributions ca...

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Problems solved by technology

Although high-frequency scattering algorithms can distinguish between several common types of scattering mechanisms, such as physical optics (PO) for specular scattering contributions, diffraction theory (GTD or PTD) or equivalent electromagnetic currents (MEC) for edge scattering contributions , multiple scattering contributions can be obtained by bouncing ray method (SBR). However, in many cases, the scattered field obtained is in the form of a total field, in which various scattering contributions are superimposed, and each scattering type cannot be directly distinguished. For example, the experimental test obtained Scattering field, scattering field obtained by low frequency algorithm

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