ISAR Image Matching and Three-Dimensional Scattering Imaging Based on Extracted Dominant Scatterers

This paper studies inverse synthetic aperture radar (ISAR) image matching and three-dimensional (3D) scattering imaging based on extracted dominant scatterers. In the condition of a long baseline between two radars, it is easy for obvious rotation, scale, distortion, and shift to occur between two-d...

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Published in:Remote sensing (Basel, Switzerland) Vol. 12; no. 17; p. 2699
Main Authors: Xu, Dan, Bie, Bowen, Sun, Guang-Cai, Xing, Mengdao, Pascazio, Vito
Format: Journal Article
Language:English
Published: Basel MDPI AG 01.09.2020
Subjects:
3D scattering imaging
affine transformation
Affine transformations
Algorithms
Anisotropy
Antennas
Calibration
Computer simulation
Inverse synthetic aperture radar
Line of sight
Matching
Methods
Motion compensation
Parameter estimation
Radar
Radar imaging
Radar systems
Random sampling
RANSAC
Remote sensing
Rotation
scatterer matching
Scattering
Simulation
Software
Statistical sampling
Three dimensional imaging
ISSN:2072-4292, 2072-4292
Online Access:Get full text
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Summary:This paper studies inverse synthetic aperture radar (ISAR) image matching and three-dimensional (3D) scattering imaging based on extracted dominant scatterers. In the condition of a long baseline between two radars, it is easy for obvious rotation, scale, distortion, and shift to occur between two-dimensional (2D) radar images. These problems lead to the difficulty of radar-image matching, which cannot be resolved by motion compensation and cross-correlation. What is more, due to the anisotropy, existing image-matching algorithms, such as scale invariant feature transform (SIFT), do not adapt to ISAR images very well. In addition, the angle between the target rotation axis and the radar line of sight (LOS) cannot be neglected. If so, the calibration result will be smaller than the real projection size. Furthermore, this angle cannot be estimated by monostatic radar. Therefore, instead of matching image by image, this paper proposes a novel ISAR imaging matching and 3D imaging based on extracted scatterers to deal with these issues. First, taking advantage of ISAR image sparsity, radar images are converted into scattering point sets. Then, a coarse scatterer matching based on the random sampling consistency algorithm (RANSAC) is performed. The scatterer height and accurate affine transformation parameters are estimated iteratively. Based on matched scatterers, information such as the angle and 3D image can be obtained. Finally, experiments based on the electromagnetic simulation software CADFEKO have been conducted to demonstrate the effectiveness of the proposed algorithm.
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ISSN:2072-4292
2072-4292
DOI:10.3390/rs12172699