SAR ocean image sea wave clutter suppression method based on sub-aperture image

A wave clutter and sub-aperture technology, applied in the microwave field, can solve the problems of texture loss of ocean phenomena, ignore the dynamic characteristics of ocean images, etc., and achieve good suppression effect

Inactive Publication Date: 2015-11-25
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

The characteristic of SAR imaging is that it needs a certain synthetic aperture time, so the SAR echo signal contains not only the geometric feature information of the ground object, but also the dynamic feature information of the ground obj

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  • SAR ocean image sea wave clutter suppression method based on sub-aperture image
  • SAR ocean image sea wave clutter suppression method based on sub-aperture image
  • SAR ocean image sea wave clutter suppression method based on sub-aperture image

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Embodiment Construction

[0012] At the same time, the present invention utilizes the differences between ocean waves and other ocean phenomena in geometric and dynamic characteristics to suppress clutter, and the suppression effect is better than the traditional suppression method based only on geometric characteristics.

[0013] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0014] It is assumed that there are two types of texture features on the sea surface, one is fast-moving waves on the sea surface, and the other is other textures that change relatively slowly (such as internal waves, oil spills, etc.). Here, for the sake of simplicity, it is assumed that other slowly changing textures remain unchanged during the SAR synthetic aperture time. That is, the sea surface SAR image signal can be deco...

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Abstract

The invention provides an SAR ocean image sea wave clutter suppression method based on a sub-aperture image. According to the method, clutter is suppressed based on the difference between sea wave and other ocean phenomena in geometric feature and dynamic feature. The suppression effect of the method is better than that of a traditional suppression method only based on the geometric feature. The method has good promotion and application values.

Description

technical field [0001] The invention relates to the field of microwave technology, in particular to a method for suppressing sea clutter in SAR ocean images based on sub-aperture images. Background technique [0002] Synthetic Aperture Radar (SAR for short) is an information acquisition technology that uses electromagnetic waves in the microwave spectrum as a detection carrier and uses synthetic apertures to achieve high-precision two-dimensional imaging of observed objects. Compared with traditional optical imaging, SAR has the advantages of long-distance detection, all-day and all-weather work. Ocean observation is an important application direction of SAR. SAR can detect various ocean phenomena such as waves, wind fields, internal waves, oil spills, and vortices on the sea surface, and can perform parameter inversion for some ocean phenomena. Waves are a very common phenomenon in SAR images of the sea surface, and often appear as dense corrugated texture structures. Wave...

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Application Information

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IPC IPC(8): G01S7/292G01S7/35G01S13/90
CPCG01S7/292G01S7/354G01S13/90G01S13/9027
Inventor 王小青高骥超种劲松
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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