Lateral Position Properties and Image Representation of Multiple Scattering Centers
The multiple scattering structure is an important scattering source that cannot be ignored,and its equiva-lent apparent scattering center often deviates from the target area.The current interpretation and recognition methods do not have the ability to trace back the scattering mechanism and scattering structure of the multiple scattering center phe-nomenon in SAR images.In order to dig deeper into the nature of the multiple scattering center position,in this paper,a scattering center model with clear physical meaning based on the theory of scattering center is established,the connec-tion between the lateral position of the multiple scattering center and the complex multiple ray paths is revealed,the for-mation mechanism of Doppler frequency is explained,and its application in radar target recognition is explored.Firstly,the analytical expression of ray field with arbitrary order is derived based on the physical process of electromagnetic scattering.Secondly,combined with the radar echo signal expression obtained from forward physical derivation and the inverse Fourier transform,the image characteristics of the target on the monostatic radar are characterized,and the direct mapping for the three-dimensional spatial position of the scattering center in the monostatic radar image is real-ized.Finally,the physical correlation between the multiple scattering ray paths,the phase characterization of the echo signal,and the position of the scattering center in the radar image are constructed by simulation.
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