Because optical and radar sensors have their own characteristics and are limited by various external conditions, the target structure and shape information that any one kind of sensors cannot be obtained completely. In this paper, the optical and ISAR imaging methods of space target are analyzed, and the analysis of space target fusion reconstruction is carried out by using optical image and ISAR image of simulation and analog measurement, The research shows that the optical and ISAR imaging have complementary characteristics, and the imaging surfaces of ISAR images are perpendicular to those of optical imaging, The comprehensive recognition results reflect the advantages of optical contour extraction and radar structure judgment.
The geometric shape of target is an effective characteristic in the process of space targets recognition. This paper proposed a method of shape inversion of space target based on components segmentation from ISAR image. The Radon transformation, Hough transformation, K-means clustering, triangulation will be introduced into ISAR image processing. Firstly, we use Radon transformation and edge detection to extract space target’s main body spindle and solar panel spindle from ISAR image. Then the targets’ main body, solar panel, rectangular and circular antenna are segmented from ISAR image based on image detection theory. Finally, the sizes of every structural component are computed. The effectiveness of this method is verified using typical targets’ simulation data.
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