Steep terrain orientation angle estimation method and system based on fully-polarized SAR

Abstract

The invention relates to a steep terrain orientation angle estimation method based on a fully-polarized SAR. The method comprises the steps that an orientation angle without a certain reference axis of a steep terrain is calculated according to fully-polarized synthetic aperture radar (SAR) data, self-adaptive expansion selection parameters are determined, the orientation angle without the certainreference axis is expanded to be an included angle between the steep terrain and a vertical polarization axis v, and therefore a correct estimation value of the orientation angle of the steep terrainis acquired. The invention furthermore provides a steep terrain orientation angle estimation system based on the fully-polarized SAR. The system comprises a coherence matrix acquisition module, a parameter calculation module, a calculation module of the orientation angle without the certain reference axis, a self-adaptive expansion selection parameter calculation module and a steep terrain orientation angle estimation module. According to the fully-polarized SAR data, a compressed polarization orientation angle of a target without the certain reference axis is calculated, the reference axis of the orientation angle is determined and expanded, the estimation range of the orientation angle is effectively expanded, and the purpose of accurately estimating the orientation angle of the steep terrain is achieved.

Description

technical field [0001] The invention relates to the field of polarization orientation angle estimation of full-polarization synthetic aperture radar targets, in particular to a method and system for estimating steep terrain orientation angles based on full-polarization SAR, and is especially suitable for steep terrain targets. Background technique [0002] Full-polarization synthetic aperture radar (Synthetic Aperture Radar for short SAR) can obtain the full-polarization scattering information of the target. Compared with single-polarization synthetic aperture radar, it can describe the state and nature of the target more comprehensively. In recent years, it has been widely used in target detection and recognition, object classification, surface parameter inversion, etc. The target orientation angle refers to the angle of rotation of the target around the radar line of sight, which can be estimated from the full polarization synthetic aperture radar data. For example, liter...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem that the orientation angle range obtained by the existing orientation angle estimation method is too small due to the uncertainty of the reference axis, and the orientation angle estimation of large orientation targets cannot be performed, thereby providing a steep terrain based on full polarization SAR Method and system for estimating orientation angle to realize accurate estimation of orientation angle in steep terrain

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