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| Citation: | JIN Mingzhen, YANG Shen, WU Zhongjie, et al. Global scattering-center modeling based on RANSAC and 3D spectral peak analysis[J]. Journal of Radars, 2024, 13(2): 471–484. doi: 10.12000/JR23113
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Global Scattering-center Modeling Based on RANSAC and 3D Spectral Peak Analysis
doi: 10.12000/JR23113
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Abstract
The global scattering-center model is a high-performance electromagnetic scattering parametric model for complex targets in an optical region. The traditional methods for constructing global scattering models are usually based on candidate-point screening and clustering and are prone to producing false scattering centers and ignoring actual scattering centers. To address this issue, this study proposes a novel modeling method based on the spectral peak analysis of the target electromagnetic scattering intensity field. First, the three-dimensional (3D) electromagnetic scattering intensity field of the target is estimated based on the multiperspective, one-dimensional scattering-center parameters of the target using the RANdom SAmple Consensus (RANSAC) and Parzen window methods. Next, the positions of the global 3D scattering centers are determined through spectral peak analysis, scattering-center association, and multivision measurement fusion. Finally, the scattering coefficients and type parameters of the global scattering centers are estimated after the visibility of the global scattering center is corrected through binary image morphological processing. Simulation results demonstrate that the global scattering center model extracted using this method, which is highly consistent with the geometrical structure of the target, achieves higher expression accuracy while using fewer scattering centers than those used in traditional methods. -
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References
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- Figure 1. The algorithmic flow for global scattering center modeling
- Figure 2. The algorithmic flow for the estimation of the target’s 3D space electromagnetic scattering intensity field
- Figure 3. The algorithmic flow for the estimation of the target’s global 3D scattering center position
- Figure 4. The algorithmic flow for the estimation of the target’s global 3D scattering center type parameters and scattering coefficients
- Figure 5. The global scattering center extraction result of the simple target
- Figure 6. 3D CAD model of a certain cruise missile
- Figure 7. High-resolution range image and one-dimensional scattering center estimation result of the target at a given pitch angle
- Figure 8. The target’s electromagnetic scattering intensity field in three-dimensional space
- Figure 9. The positions of the target’s global scattering centers
- Figure 10. The visibility maps of the global scattering centers
- Figure 11. Original and reconstructed high resolution range profiles at the pitch angle of 45°
- Figure 12. Original and reconstructed high resolution range profiles of the target
- Figure 13. Original and reconstructed narrowband RCS of the target
- Figure 14. Distribution histogram of the correlation coefficients