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Extraction of Unambiguous Doppler Information for Fast-Moving Targets in FMCW Radar Based on Density-Guided Sparse Reconstruction
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DOI：10.1109/tim.2026.3714597.png)
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Abstract
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To enlarge the maximum unambiguous Doppler of saw-tooth frequency-modulated continuous wave (FMCW) radar without reducing the range resolution, an algorithm of extracting the unambiguous Doppler information for fast-moving targets in saw-tooth FMCW radar is proposed in this article based on density-guided sparse reconstruction. A novel nonuniform chirp sequence with continuous interval variation is designed to realize spectral anti-aliasing at sub-Nyquist rates. The density of each scatterer can be calculated from the preprocessing result with nonstructured noise introduced by a nonuniform chirp sequence, and then, the matrix of sparse regularization parameter can be determined through the density map. The proposed method is able to reconstruct the range-Doppler spectrum correctly with extended unambiguous Doppler and unreduced range resolution. Compared to the existing methods for extending the maximum unambiguous Doppler of saw-tooth FMCW radar, the proposed method works well in multitarget scenarios. Compared to existing sparsity-driven signal processing methods for saw-tooth FMCW radar, the proposed method can enhance the reconstruction ability of weak targets. Simulations and experiments on real measured saw-tooth FMCW radar data demonstrate the effectiveness of the proposed method.
Keywords:
Density-guided sparse reconstruction
nonuniform sampling
saw-tooth frequency-modulated continuous wave (FMCW) radar
unambiguous Doppler extension
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5.9
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1.9W
Citations:
5.8W
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