Multi-target imaging method for inverse synthetic aperture radar

Abstract

The invention belongs to multi-target imaging technology for inverse synthetic aperture radar, which comprises distance direction compression, target number determination, coarse distance correction, target isolation, fine distance correction, phase compensation and orientation compression on the received echo signals. The number of the targets is judged according to a coarse ridge line image after the distance compression, the inclination angle detection is carried out on the coarse ridge line image of the target through projection transformation, and each target distance is precisely corrected by adopting a reference correlation and a quadratic curve fitting method after the coarse distance correction and the isolation treatment are carried out on each target; and not only the linear distance drift of the target can be corrected, but also the nonlinear distance drift can be corrected. Therefore, the technology has the characteristics of accurately judging the number of the targets, imaging a plurality of targets with high imaging definition and the like, and overcomes the defects of large correction treatment restriction, poor effect and the like because the background technology only can correct the linear distance drift but cannot correct the nonlinear distance drift.

Description

technical field [0001] The invention belongs to the imaging technology of inverse synthetic aperture radar; it particularly relates to the existence of multiple targets in the imaging space, and the radial velocity difference of each target relative to the radar is relatively large, so that after the distance is compressed, the two-dimensional images of each target appear as thick ridges intersecting each other Imaging techniques in the state (also known as cross-mode). Background technique [0002] Inverse Synthetic Aperture Radar (ISAR) can perform all-weather long-distance imaging of space targets. It has important application value in the fields of astronomy, meteorology and the observation of moving objects, such as the atmosphere, clouds, and the movement of aircraft. Inverse Synthetic Aperture Radar (ISAR) is based on the distance-Doppler principle of imaging. The key to imaging is motion compensation. Through motion compensation, a certain point on the target become...

AI Technical Summary

Problems solved by technology

To overcome the background technology can only correct the linear distance offset, can not correct the nonlinear distance offset, the limitations of its correction processing is large, the effect is not good and other defects

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