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| Citation: | ZHENG Tong, JIANG Libing, and WANG Zhuang. Three-dimensional multiple-input multiple-output radar imaging method based on integration of multi-snapshot images[J]. Journal of Radars, 2020, 9(4): 739–752. doi: 10.12000/JR19069
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Three-dimensional Multiple-Input Multiple-Output Radar Imaging Method Based on Integration of Multi-snapshot Images
DOI: 10.12000/JR19069
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Abstract
To improve the cross-range resolution of three-dimensional (3-D) images obtained along the direction of movement by Multiple-Input Mmultiple-Output (MIMO) radar, a novel MIMO-ISAR 3-D imaging method that combines multi-snapshot images is proposed. This method integrates multiple single-snapshot 3-D images acquired by a planar antenna array during a specific period of observation and extracts the peak slice along the linear fitting direction of the scatterers to construct a new 3-D image. The simulation results demonstrated that the proposed method significantly improves the cross-range resolution of the imaging results along the direction of movement compared with other methods based on single-snapshot 3-D images. Additionally, compared with the classical MIMO-ISAR method based on rearrangement and interpolation, this method is suitable for both fast-moving and slow-moving targets. Moreover, the imaging results are well focused and the side lobes along the direction of movement are effectively suppressed.
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References
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- Figure 1. Geometry of MIMO radar and target
- Figure 2. Configuration of the MIMO radar system
- Figure 3. Range profiles of echo signal
- Figure 4. Range profiles of 10 snapshots after envelope alignment
- Figure 5. Flowchart of the 3-D imaging algorithm based on multi-snapshot images integration
- Figure 6. The effect of the proposed method on the PSF of the scatterer
- Figure 7. The direction cosine information of the target’s velocity
- Figure 8. Three different projections and 3-D view of YunYing model
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Figure 9. The Doppler linear fitting results with different
$\gamma $ -
Figure 10. Estimation of
$\omega $ - Figure 11. 3-D imaging results with one-snapshot signal
- Figure 12. 3-D imaging results of the slow target by the proposed method
- Figure 13. 3-D imaging results of the slow target by the classical interpolation method
- Figure 14. 3-D imaging results of the fast target by the proposed method
- Figure 15.
- Figure 15. 3-D imaging results of the fast target by the classical interpolation method