Maritime target detection method for polsar images based on polarization direction angle compensation

Abstract

The invention discloses a POLSAR image marine target detection method based on polarization direction angle compensation. According to the method, the polarization scattering property of an artificial metal marine target is used for detection, and in order to solve the problem that sea clutter reflection symmetry is affected by direction angle deviation generated by sea wave disturbance, direction angle compensation is conducted on a POLSAR image, and the detection accuracy of the marine target is improved. The method includes the steps that firstly, a completely-polarized image is acquired and related preprocessing operation is conducted; then, the polarized direction angle is calculated through a coherence matrix and direction angle compensation is conducted on the coherence matrix; finally, the intensity value of an element T'13 in the coherence matrix obtained after direction angle compensation is extracted and the artificial metal marine target is detected. The method overcomes the defects that a common marine target detection algorithm is complex in theory, difficult to achieve, poor in robustness and the like, and meanwhile starting from the polarization scattering property of the target, the marine target is accurately separated from sea clutters and target side lobes. The detection method is visual in principle, simple in algorithm and capable of facilitating programming realization and expansion.

Description

technical field [0001] The invention relates to the field of POLSAR images, in particular to a method for detecting sea targets in POLSAR images based on polarization direction angle compensation. Background technique [0002] The ocean, a blue land, is rich in various resources and has extremely important strategic significance in national economic development, environmental climate change, and military defense. [0003] In recent years, ocean-related problems have occurred frequently. To prevent and solve these problems, there is an urgent need to monitor the ocean. Maritime man-made metal targets (including ships, drilling platforms, etc., hereinafter referred to as maritime targets) are closely related to human life and production, so they have become the focus of marine monitoring. [0004] At present, conventional maritime target monitoring methods include shore-based, ship-borne detection devices, optical remote sensing, etc. Shore-based and ship-borne detection dev...

AI Technical Summary

Problems solved by technology

At the same time, the problem of the influence of the direction angle offset caused by the wave disturbance on the symmetry of the sea clutter reflection is solved by the polarization direction angle compensation

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