Circular SAR-based dihedral corner reflector optimal imaging azimuth determining method

Abstract

The present invention provides a circular SAR-based dihedral corner reflector optimal imaging azimuth determining method. According to the method of the invention, the scattering model of a dihedral corner reflector is built, RCS prediction for the scattering model is realized through using an RCS prediction method, and the change of the amplitude and phase of the RCS of the model with an azimuth is analyzed; and non-isotropic radar echo data are generated under a circular SAR pattern according to the obtained RCS of the scattering model, and a BP imaging algorithm is utilized to image the model, and the imaging quality of the model is compared with the imaging quality of an isotropic ideal point target, and the optimal imaging azimuth of the dihedral corner reflector is determined through analysis. With the method of the invention adopted, optimal imaging azimuth selection of different typical targets under different circular SAR system parameters can be realized, the deterioration of the signal-to-noise ratio of the SAR images of the targets can be avoided, and scattering information is not missing assuredly, and at the same time, the resolution of the SAR images is not reduced assuredly. The circular SAR-based dihedral corner reflector optimal imaging azimuth determining method has a high practical value.

Description

Technical field [0001] The invention relates to the field of microwave remote sensing detection, in particular to a method for determining the best azimuth imaging angle of a dihedral corner reflector based on circular SAR. Background technique [0002] The dihedral corner reflector is a typical scattering structure with strong even scattering. Many complex targets contain components with similar scattering characteristics, such as the dihedral angle formed by the wall and the ground of the building, the dihedral angle formed by the ship’s side and the sea surface, and the dihedral angle formed by the vertical tail of an aircraft. It is of great significance to study and discuss the scattering characteristics and imaging methods of such targets. [0003] The circular track synthetic aperture radar (Synthetic Aperture Radar, referred to as SAR) realizes a 360° omni-directional observation of the target area by controlling the radar track to be a circle in the air, and controlling t...

AI Technical Summary

Problems solved by technology

In the circular SAR imaging mode, if the 360-degree fully coherent cumulative imaging is performed on the target, the SAR image signal-to-noise ratio of the target will deteriorate and the scattering information will be lost; if the target is coherently cumulative within a small aperture, it will lead to SAR image resolution reduction

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