Point Target Near-Field Bistatic Imaging: Chirp-Based Aliasing Analysis
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
| Veröffentlicht: |
2025
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| _version_ | 1866909957767561216 |
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| author | Sambon, Baptiste Monnoyer, Gilles Oestges, Claude Vandendorpe, Luc |
| author_facet | Sambon, Baptiste Monnoyer, Gilles Oestges, Claude Vandendorpe, Luc |
| contents | This paper presents a chirp-based framework for characterising aliasing in a bistatic Near-Field (NF) imaging system equipped with multidimensional antenna arrays. Extending monostatic formulations, we derive closed-form expressions for the maximum spatial frequency, enabling the analytical derivations of the conditions for aliasing-free image reconstruction. The framework also provides a geometric interpretation of aliasing based on the antenna array geometry, target position, and antenna element spacing. Numerical results corroborate theoretical findings and show that the aliasing-free region enlarges with smaller antenna spacing, greater target range, lower array dimensionality, and smaller arrays. These results enable more effective design of bistatic NF imaging systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_11444 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Point Target Near-Field Bistatic Imaging: Chirp-Based Aliasing Analysis Sambon, Baptiste Monnoyer, Gilles Oestges, Claude Vandendorpe, Luc Signal Processing This paper presents a chirp-based framework for characterising aliasing in a bistatic Near-Field (NF) imaging system equipped with multidimensional antenna arrays. Extending monostatic formulations, we derive closed-form expressions for the maximum spatial frequency, enabling the analytical derivations of the conditions for aliasing-free image reconstruction. The framework also provides a geometric interpretation of aliasing based on the antenna array geometry, target position, and antenna element spacing. Numerical results corroborate theoretical findings and show that the aliasing-free region enlarges with smaller antenna spacing, greater target range, lower array dimensionality, and smaller arrays. These results enable more effective design of bistatic NF imaging systems. |
| title | Point Target Near-Field Bistatic Imaging: Chirp-Based Aliasing Analysis |
| topic | Signal Processing |
| url | https://arxiv.org/abs/2512.11444 |