A Synthetic Aperture Radar Image Simulation Method of Metal Polygon and Its Application

Abstract

A synthetic aperture radar image simulation method for a metal polygon comprises the steps of establishing a three-dimensional coordinate system according to a radar incident direction, calculating an imaging coordinate transformation matrix T; according to the imaging coordinate transformation matrix T and a radar imaging parameter, calculating a pixel coordinate which corresponds with each vertex of the metal polygon; calculating the scattering strength of each vertex of the metal polygon; calculating a data matrix which corresponds with a simulated SAR image, and generating the simulated SAR image. The simulation method has advantages of effectively simulating a synthetic aperture mechanism under low calculation amount, overcoming a defect of incapability of effectively simulating the synthetic aperture mechanism according to a projection mapping method, and overcoming a defect of high complexity for simulating the mechanism according to a two-dimensional frequency domain method.

Description

technical field [0001] The present invention relates to the technical fields of high-frequency scattering calculation and synthetic aperture radar imaging, and further relates to a disclosed metal polygon synthetic aperture radar (Synthetic Aperture Radar, SAR) image simulation method, and the application of the method to carry out SAR image simulation of artificial targets. Background technique [0002] In recent years, with the continuous development of SAR equipment and imaging technology, the understanding and interpretation of SAR images has attracted much attention. In order to invert the information of man-made targets and establish the relationship between SAR images and related parameters of man-made targets, the commonly used research method is to use the scattering mechanism and SAR working principle to simulate SAR images. SAR image simulation has become one of the research hotspots in the field of SAR. SAR image simulation mainly includes three steps: scene mod...

AI Technical Summary

Problems solved by technology

[0008] First, both the simulation method in the two-dimensional frequency domain and the method based on projection mapping uniformly discretize the target surface into bins of one-tenth of the wavelength. There is a lot of computational redundancy

[0009] Specifically, the redundancy in modeling is reflected in: the metal polygon itself has a planar structure, and the purpose of discretization is to obtain surface elements with a planar structure, so there is a lot of redundancy in discretization, especially for polygons with large areas structure; the redundancy in scattering calculation is reflected in: after the target is discretized into several triangular or quadrilateral surface elements, each triangular surface element and quadrilateral surface element participate in the calculation as a unit of scattering calculation, but in fact, the metal polygon The scattering calculation can be deduced according to the integral formula, and the analytical algorithm is used, so there is a lot of redundancy in the scattering calculation

[0010] Second, the metal polygon has a special structure, and the synthetic aperture factor has a very important influence on the image characteristics of the structure, while the method based on projection mapping cannot reflect the influence of the synthetic aperture factor on the image characteristics in the process of SAR image acquisition. Polygonal structure, the SAR image obtained by the SAR image simulation method based on projection mapping will be very different from the actual image

Although the two-dimensional frequency domain method considers the synthetic aperture mechanism, its computational complexity is huge and the speed is slow.

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