Height reconstruction method of synthetic aperture radar image

Abstract

The invention discloses a height reconstruction method of a synthetic aperture radar image. The method comprises the steps of: 1, carrying out de-noising processing on the synthetic aperture radar image and obtaining a de-noised image; 2, obtaining a noise image, utilizing a noise threshold to verify an object shadow, and finishing the extraction of the object shadow; 3, calculating the practical altitude height and accurate ground position of an object according to geometrical relations; 4, mapping the object to a C type image. According to the invention, only a single SAR image is needed, so that the higher practicality is realized; in the invention, how to utilize a B type image, a radar equipment height, wave beams and a ground level included angle to determine the practical position of the object is discussed, and the corresponding C type image can be obtained according to the position of the object; in addition, the method can be used for obstacle detection and height judgment in launching and landing processes of the airborne synthetic aperture radar, thereby ensuring the real-time performance and providing important significance to flight safety.

Description

technical field [0001] The invention relates to the technical field of radar image processing, in particular to a method for reconstructing the height of a Synthetic Aperture Radar (SAR) image. Background technique [0002] Synthetic aperture radar is more and more widely used, and its image is usually displayed as a B-scope display, which displays the distance on the vertical axis and the azimuth of the radar on the horizontal axis, that is, the distance-angle display. In the B-type display, different targets with the same azimuth angle may be presented at the same point, and it is difficult to distinguish the difference in height. The C-type display (C-scope) provides a new option for the target. The C-type display image is processed and converted according to the B-type display image, and the altitude is provided in the form of elevation angle. This angle-angle display is consistent with the effect of ordinary optical imaging, similar to the scene directly observed by th...

AI Technical Summary

Problems solved by technology

[0003] The key to height reconstruction is how to accurately calculate the actual altitude of the target, and the second is to project the target to an accurate position, otherwise, the resulting height difference or position offset will make the conversion work meaningless

[0004] The patented single-flight full-polarization synthetic aperture radar image retrieval method of ground digital elevation with the authorization number CN1234018C has a large amount of calculation, and the obtained elevation image is not as intuitive as perspective imaging for pilots.

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