Identification and Extraction Method of Scattering Mechanism Based on Adaptive Gaussian Expression

A technology of scattering mechanism and extraction method, which is applied in the research field of target electromagnetic scattering characteristics, can solve the problems of no target electromagnetic scattering characteristic analysis, no time-frequency analysis algorithm, etc.

Active Publication Date: 2019-10-18
SHANGHAI RADIO EQUIP RES INST
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Problems solved by technology

In summary, foreign research institutions have noticed the role of time-frequency analysis in the study of electromagnetic scattering characteristics, but have not found a time-frequency analysis algorithm that can adaptively distinguish between local and non-local scattering mechanisms; while domestic researchers only use time-frequency analysis. Frequency analysis is used for radar imaging processing, and target electromagnetic scattering characteristic analysis is not carried out

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  • Identification and Extraction Method of Scattering Mechanism Based on Adaptive Gaussian Expression
  • Identification and Extraction Method of Scattering Mechanism Based on Adaptive Gaussian Expression
  • Identification and Extraction Method of Scattering Mechanism Based on Adaptive Gaussian Expression

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[0054] based on the following figure 1 with figure 2 , specifically explain the preferred embodiment of the present invention.

[0055] Such as figure 1As shown, the present invention provides a method for identifying and extracting scattering mechanisms based on adaptive Gaussian expression, comprising the following steps:

[0056] Step S1, acquiring broadband-angle scanning scattering data of the target;

[0057] Step S2, performing AGR calculation on the signal in the distance direction or the azimuth direction;

[0058] Step S3, calculating an adaptive spectrum diagram (Adaptive Spectrogram, ADS) of signal energy according to the AGR calculation result; the adaptive spectrum diagram is a distribution diagram of signal energy in the time-frequency domain;

[0059] Step S4, separating the signal component with a large Gaussian basis function width and the signal component with a small width in the AGR, and performing ISAR imaging respectively to realize the positioning ...

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Abstract

The invention discloses a scattering mechanism identification and extraction method based on adaptive Gaussion representation (AGR). Broadband-angle scanning scattering data of an object is obtained, AGR calculation is performed on signals in a distance direction or an orientation direction, according to an AGR calculation result, an adaptive frequency spectrogram of signal energy is calculated, finally, signal components with large widths and signal components with small widths of a Gauss primary function in the AGR are separated, ISAR imaging is respectively performed, and thus positioning and separation of a scattering mechanism are realized. The method realizes position identification of local and nonlocal scattering mechanisms on a complex object, can also realize separation of different mechanisms through extraction of different Gauss primary functions, can be applied to electromagnetic stealth design, can also be applied to SAR / ISAR image understanding and processing and solves the problem of image fuzziness caused by nonlocal scattering in SAR / ISAR images, thereby being a basic analysis method with wide application prospect.

Description

technical field [0001] The invention relates to the field of research on electromagnetic scattering characteristics of targets, in particular to a method for identifying and extracting scattering mechanisms based on Adaptive Gaussion Representation (AGR). Background technique [0002] Man-made complex targets are composed of scattering sources such as planes, edges, dihedral angles, trihedral angles, and cavities. Each scattering source has a different backscattering mechanism, and the backscattering mechanism of complex targets is often difficult to predict. If the scattering field has a fixed amplitude and a linear phase change as the frequency changes, such a scattering characteristic is called a non-dispersive scattering mechanism, which can be simulated by a point scattering model. The amplitude of the scattering phenomenon in reality is generally weakly frequency-dependent, and the phase is also a nonlinear function of frequency. This kind of dispersion phenomenon occ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/904G01S13/9064
Inventor 贺新毅童广德徐秀丽高鹏程
Owner SHANGHAI RADIO EQUIP RES INST
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