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| Citation: | Jin Tian, Song Yongping. Sparse Imaging of Building Layouts in Ultra-wideband Radar[J]. Journal of Radars, 2018, 7(3): 275-284. doi: 10.12000/JR18031
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Sparse Imaging of Building Layouts in Ultra-wideband Radar
doi: 10.12000/JR18031
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Abstract
Ultra-WideBand (UWB) radar can reconstruct the layout of a building, providing rich information for detecting and locating humans in buildings. Traditional imaging methods suffer from serious sidelobes and location displacement of behind-the-wall target because of the influence of walls. Sparse recovery is introduced into the field of through-the-wall imaging to improve the imaging quality. However, the reconstruction probability of weak scattering targets is low in traditional methods. In this study, the combination of sparse recovery method and Coherence Factor (CF) weighting is proposed to improve the reconstruction probability of weak scattering targets inside a room. The quasi-establishment of the support set can be improved during sparse imaging by reducing the effect of the sidelobes of strong scattering targets with CF, ultimately enhancing the robustness of the sparse imaging of the building layout. A location correction model for multiple walls after sparse imaging is established, based on which the locating error of walls can be reduced with a low amount of calculation. The results of the measured data reveal that compared with the traditional generalized orthogonal matching pursuit method, the proposed methods can improve the reconstruction probability of weak scattering targets and reduce the locating error of the inner layouts of buildings to less than 10 cm. -
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References
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- Figure 1. MIMO radar image model
- Figure 2. The general flow of greed methods
- Figure 3. The procedure of CF
- Figure 4. The schematic of building layout imaging with multi-layer wall
- Figure 5. The experimental scene and BP imaging result
- Figure 6. Comparison of GOMP and CF-GOMP reconstruction results under different data ratios
- Figure 7. Comparison of the distribution of building structures on the y axis before (the blue dot line) and after (the red solid line) correction in CF-GOMP reconstruction with 100% data
- Figure 8. Corrected CF-GOMP reconstruction result with 100% data